Academic literature on the topic 'Geotechnical engineering'

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Journal articles on the topic "Geotechnical engineering"

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MUFF, O. P. "Geotechnical Engineering." Environmental & Engineering Geoscience III, no. 1 (March 1, 1997): 156–57. http://dx.doi.org/10.2113/gseegeosci.iii.1.156.

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Tsugawa, Juliana Keiko, Roberto Cesar de Oliveira Romano, Rafael Giuliano Pileggi, and Maria Eugenia Gimenez Boscov. "Review: Rheology concepts applied to geotechnical engineering." Applied Rheology 29, no. 1 (March 3, 2020): 202–21. http://dx.doi.org/10.1515/arh-2019-0018.

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AbstractThe effect of time on soil properties, noticeable in many earthworks, is recognized by geotechnicians. For example, secondary compression and aging pre-consolidation are considered in geotechnical design, and strain rate is standardized in geotechnical laboratory and field tests. Elastic-plastic models, from rigid-perfect plastic to Modified Cam Clay, which do not consider the effects of time, solve most geotechnical problems. However, solutions for prolonged settlements, landslides, debris flow and mudflow could profit from a deeper understanding of rheological models. In fact, rheological concepts, despite not always clearly stated, have been used to address some of these problems, and may also be important for using new materials in geotechnical practice (tailings, sludge, soil-polymer mixtures and other materials with water content higher than the liquid limit). This paper introduces basic concepts of rheology for geotechnicians, specially highlighting viscoelasticity under simple shear stress, which explains with reasonable accuracy well known phenomena dependent on time in soils. The objective is to bring geotechnicians to rheology and show another important tool to access geotechnical problems. On the other hand, a brief explanation of geotechnical tests is presented for rheologists not acquainted with geotechnical engineering. Geotechnical tests procedures are discussed in the light of rheology concepts, terminology is clarified, examples of application of rheology in geotechnics are presented, and determination of soil rheological parameters by traditional geotechnical tests as well as by tests on concrete is commented.
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HATHEWAY, A. W. "Geotechnical Earthquake Engineering." Environmental & Engineering Geoscience III, no. 1 (March 1, 1997): 158–59. http://dx.doi.org/10.2113/gseegeosci.iii.1.158.

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McCartney, John S., and Ingrid Tomac. "Preface to the Proceedings for the 2nd International Conference on Energy Geotechnics (ICEGT2020)." E3S Web of Conferences 205 (2020): 00001. http://dx.doi.org/10.1051/e3sconf/202020500001.

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With ever increasing energy demand and related climate change implications, the development of sustainable energy systems based on integrated schemes of energy production, transport, transfer, and storage is an important challenge to society. The broad and emerging area of Energy Geotechnics has the potential to address this challenge from multiple perspectives by integrating concepts from geotechnical engineering and geomechanics with cross-disciplinary concepts from geology, hydrology, geophysics, geochemistry, petroleum engineering, and energy policy. The 2nd International Conference on Energy Geotechnics is organized by the members of the International Society of Soil Mechanics and Geotechnical Engineering (ISSMGE) Technical Committee 308 on Energy Geotechnics, and is the main international venue for interaction, communication, and technology transfer for academic and non-academic parties, including researchers and practitioners, in the broad areas within Energy Geotechnics
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Wang, Hui, and Xingxing Wei. "Three-dimensional stochastic model for stratigraphic uncertainty quantification using Bayesian machine learning." IOP Conference Series: Earth and Environmental Science 1337, no. 1 (May 1, 2024): 012012. http://dx.doi.org/10.1088/1755-1315/1337/1/012012.

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Abstract Data-driven geotechnics is an emerging research field that contributes to the digitalization of geotechnical engineering. Among the numerous applications of digital techniques in geotechnical engineering, interpreting and simulating stratigraphic conditions with quantified uncertainty is an essential task and an open question in geotechnical practice. However, developing an uncertainty-aware integration of subjective engineering judgments (i.e., geological knowledge) and sparse objective site exploration results (i.e., borehole observations) is challenging. This investigation develops an effective three-dimensional stochastic geological modeling framework based on Markov random field (MRF) theory and Bayesian machine learning to characterize stratigraphic uncertainty. The proposed model considers both stratigraphic uncertainty (inherent) and model uncertainty (imperfect knowledge). A stratigraphic modeling example was studied to demonstrate the effectiveness of the proposed approach. We envision that this approach could be further generalized to industrial practices to improve risk control in geotechnical engineering.
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Lei, Wei. "Geotechnical Engineering and Engineering Practice in Artificial Filling." Applied Mechanics and Materials 152-154 (January 2012): 720–22. http://dx.doi.org/10.4028/www.scientific.net/amm.152-154.720.

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In China, the geotechnical engineering has aroused the attention of geotechnical engineers, who take it as a special research topic. In this paper, problems on artificial filling are discussed, including the environmental geotechnical engineering, the foundation and engineering practices, with corresponding solutions put forward.
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Kryvosheiev, P. I., P. M. Kozeletskiy, V. M. Senatorov, and M. V. Kornienko. "COOPERATION OF UKRAINIAN SOCIETY FOR SOIL MECHANICS, GEOTECHNICS AND FOUNDATION ENGINEERING WITH INTERNATIONAL SOCIETY ISSMGE." ACADEMIC JOURNAL Series: Industrial Machine Building, Civil Engineering 2, no. 49 (October 17, 2017): 5–11. http://dx.doi.org/10.26906/znp.2017.49.816.

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Information about cooperation of Ukrainian Society for Soil Mechanics, Geotechnics and Foundation Engineering with International Society for Soil Mechanics and Geotechnical Engineering, the results of Ukrainian society activity and prospects of its development are presented in paper. It is considered participation of Ukrainian specialists in International and regional conferences; results of the ninth All-Ukrainian scientific and technical conference «Soil mechanics, geotechnics and foundation engineering: problems, innovations and implementation of Eurocodes in Ukraine» and prospects of Ukrainian society development.
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Namdar, A. "Mineralogy in Geotechnical Engineering." Journal of Engineering Science and Technology Review 3, no. 1 (June 2010): 108–10. http://dx.doi.org/10.25103/jestr.031.18.

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Kadivar, Marzieh, Kazem Barkhordari, and Mehdi Kadivar. "Nanotechnology in Geotechnical Engineering." Advanced Materials Research 261-263 (May 2011): 524–28. http://dx.doi.org/10.4028/www.scientific.net/amr.261-263.524.

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The present paper reviews the application of nanotechnology in geotechnical engineering, in which the concept of nanotechnology as well as the new concept of nanosol is explained. We have also given explanation for nanometer additives used in the introduced soil, different forms of nanoparticles, their specific properties, and effects of these nanoparticles on engineering properties of soil including index properties and strength, and analyzed the reasons through which these effects are caused. Furthermore, influence of recent advances in nanoinstruments and electron microscopes as well as their application in geotechnical studies.
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Sivakumar Babu, G. L. "Briefing: Forensic geotechnical engineering." Proceedings of the Institution of Civil Engineers - Forensic Engineering 169, no. 4 (November 2016): 123–26. http://dx.doi.org/10.1680/jfoen.16.00025.

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Dissertations / Theses on the topic "Geotechnical engineering"

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Faria, P. de D. "Shakedown analysis in geotechnical engineering." Thesis, Swansea University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636956.

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Many problems in geotechnology are concerned with the response of earth materials to cyclic loads. These loads are either generated by forces of nature such as sea waves, currents, winds, and earthquakes or as a consequence of engineering operations such as blasting, pile driving and rotating machines. For most design purposes related to static loads it is logical to use as a design basis either the elastic range where no plastic deformation occurs or the plastic range, in which large plastic deformation can occur. However, when cyclic loading is involved few design methods are available since a pattern for the response of the body to cyclic loads is not well known. When a body is subjected to cyclic loading some modes of adaptation or non adaptation can occur as a response to the loads such as elastic shakedown, alternating plasticity and ratchetting. Despite its extensive use in structural problems very few applications of the shakedown approach to soil masses can be found in literature. Therefore the present work aims to extend the elastic shakedown concepts to geotechnical problems. Initially the shakedown concepts are introduced, its theorems and their importance for geomechanical problems are highlighted. Later the use of Melan's static shakedown theorem for the present study is shown. Shakedown analyses of plane stress and plane strain problems are presented. In this study the shakedown formulation is based on the concept of a residual stress field obtained by means of a numerical formulation using a visco-plastic algorithm. Two numerical codes linked with a mesh generator were implemented as tools for the treatment of the shakedown problems. Numerical examples and applications are shown to illustrate the usefulness of the present approach.
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Davey-Wilson, Ian Edward George. "A knowledge-based system in geotechnical engineering." Thesis, University of Bradford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.277162.

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Kobayashi, Shun-ichi. "Limit and Shakedown Design in Geotechnical Engineering." 京都大学 (Kyoto University), 2004. http://hdl.handle.net/2433/148311.

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Ouyang, Yue. "Geotechnical behaviour of energy piles." Thesis, University of Cambridge, 2014. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708099.

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Bao, Yu. "A Biot formulation for geotechnical earthquake engineering applications." Diss., Connect to online resource, 2006. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3219029.

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Shah, Janvi Pankaj. "Resilient geotechnical asset management." Thesis, University of Birmingham, 2016. http://etheses.bham.ac.uk//id/eprint/6644/.

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There is overwhelming evidence that the development of new, technically sound, engineered and fit-for-purpose critical physical infrastructure is vital for economic growth and stability. With many countries targeting significant levels of capital investment in energy, transport, communications, flood management and water and waste water infrastructure, there is a vital need for asset management frameworks that can provide both robust and resilient asset support. Currently, asset management tools focus predominantly on data management, deterioration modelling, condition assessment, risk, as well as economic factors (such as whole-life costing and developing investment plans). Some also consider the vulnerabilities of a network to climate change and extreme weather events such as flooding. However, rather than taking a long term view, asset management strategies are often short term, typically five years or less. What is needed is a long-term approach, which will ensure assets are safe, secure and resilient to what the future may hold in 20, or even 50 years’ time. The thesis describes the development of a ‘Resilience Assessment Framework’ which provides a platform to appraise resilience of geotechnical assets in the planning stage of asset management by considering how geotechnical assets (specifically for transport infrastructure) designed and built today will perform in the light of socio-economic, environmental, political, technological changes and shock events in the future. This framework intends to assist in strategic level decision-making by enabling long term planning and management of geotechnical assets and help future proof transport infrastructure. The proposed framework is validated using two real case studies to demonstrate its use and applicability in the field of geotechnical asset management.
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Holt, Daniella Godinho Abreu. "Sustainable assessment for geotechnical projects." Thesis, University of Birmingham, 2011. http://etheses.bham.ac.uk//id/eprint/3034/.

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Geotechnical engineering has a crucial role to play in enhancing sustainability due to its pivotal role in the construction process where potentially impacts are highest. Currently, there is a lack of methodologies for assessing geotechnical projects that truly encompass the three core pillars of sustainability. A robust system is required which offers an holistic approach that is both flexible and easily understood, whilst not being biased towards rewards or is prohibitively costly. In addition, ‘tool fatigue’, whereby a system is generated but never used, must be avoided. After a detailed evaluation of the systems available, the SPeAR® framework was selected. Following detailed discussion with a variety of practitioners, the methodology was significantly adapted to make it applicable to geotechnical problems and ensure that geotechnical engineers can understand and use it with relatively ease. The new version, called ‘GeoSPeAR’ in this thesis, allows for greater communication between masterplanning and geotechnical engineering via their common base, thus avoiding a potential barrier to greater adoption of more sustainable practices through the construction cycle. Three case studies demonstrated the assessment of the ‘GeoSPeAR’ methodology. These showed the practical application of the system and how this effectively supports geotechnical engineers in embedding sustainability into projects.
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Brimicombe, A. J. "The application of geomorphological triangular databases in geotechnical engineering." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1985. http://hub.hku.hk/bib/B31207157.

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Oliphant, J. "Controlling safety and capturing engineering judgement in geotechnical design." Thesis, University of Bristol, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381407.

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McCombie, Paul F. "Some developments of limit equilibrium analyses in geotechnical engineering." Thesis, University of Bath, 2008. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.501625.

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Four journal papers have been selected from the candidate's published research output, to represent his work in developing analytical methods for use in geotechnical engineering design and analysis. Two of the papers contribute to significant advances in the understanding of the behaviour of dry-stone retaining walls, which will lead to greater confidence in the assessment of existing walls and the design of new walls. The other two papers develop optimisation and analysis routines with the aim of supporting the assessment of slope stability, and the design of new cut and built slopes and stabilisation works.
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Books on the topic "Geotechnical engineering"

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Briaud, Jean-Louis. Geotechnical Engineering. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118686195.

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Lancellotta, Renato. Geotechnical engineering. Rotterdam: A.A. Balkema, 1995.

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Lancelotta, Renato. Geotechnical engineering. Rotterdam: A.A.Balkema, 1994.

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Cernica, John N. Geotechnical engineering. New York: Wiley, 1995.

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National Research Council (U.S.). Transportation Research Board., ed. Geotechnical engineering. Washington, D.C: Transportation Research Board, National Research Council, 1986.

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Pitilakis, Kyriazis D., ed. Earthquake Geotechnical Engineering. Dordrecht: Springer Netherlands, 2007. http://dx.doi.org/10.1007/978-1-4020-5893-6.

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Rao, V. V. S., and G. L. Sivakumar Babu, eds. Forensic Geotechnical Engineering. New Delhi: Springer India, 2016. http://dx.doi.org/10.1007/978-81-322-2377-1.

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Towhata, Ikuo. Geotechnical Earthquake Engineering. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-35783-4.

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National Research Council (U.S.). Transportation Research Board. Meeting, ed. Geotechnical engineering, 1991. Washington, D.C: Transportation Research Board, National Research Council, 1991.

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National Research Council (U.S.). Transportation Research Board., ed. Geotechnical engineering, 1989. Washington, D.C: Transportation Research Board, National Research Council, 1989.

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Book chapters on the topic "Geotechnical engineering"

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Hendry, Michael T. "Geotechnical Engineering." In Selective Neck Dissection for Oral Cancer, 1. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-12127-7_139-1.

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Hendry, Michael T. "Geotechnical Engineering." In Encyclopedia of Earth Sciences Series, 408–9. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73568-9_139.

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Sekharan, Sreedeep, Vinay Kumar Gadi, Sanandam Bordoloi, Abhisekh Saha, Himanshu Kumar, Budhaditya Hazra, and Ankit Garg. "Sustainable Geotechnics: A Bio-geotechnical Perspective." In Developments in Geotechnical Engineering, 313–31. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-5871-5_15.

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Wu, Jiaming, Linfabao Dai, Guangqiao Xue, and Jian Chen. "Theory and Technology of Digital Twin Model for Geotechnical Engineering." In Lecture Notes in Civil Engineering, 403–11. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1260-3_37.

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AbstractAs an innovative information technology, Digital Twin has greatly promoted the development of intelligent manufacturing in the industry. However, in the field of geotechnical engineering, there are still few researches on this aspect, which is still a “new territory” and “no man's land”. The concept of digital twin coincides with the needs of geotechnical engineering informatization, so the introduction of digital twin technology into the field of geotechnical engineering will help to promote the development process of geotechnical engineering informatization and digitization. This paper puts forward and defines the digital twin model of geotechnical engineering, describes the connotation of the digital twin model, and studies the architecture of the digital twin model of geotechnical engineering. On this basis, the integration and sharing mechanism of geotechnical engineering digital twin data based on BIM technology is proposed. In order to break through the defect that the geotechnical engineering information model has not fully played its role for a long time, an integrated model of geological body and structural body is constructed based on the construction and integration module of geotechnical digital twin model. Furthermore, the geotechnical engineering digital twin simulation analysis module is developed to initially form the geotechnical engineering digital twin model, so as to realize the geotechnical engineering digital design, collaborative construction, visual decision-making and transparent management.
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Parker, Harvey W. "Geotechnical Investigations." In Tunnel Engineering Handbook, 46–79. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-0449-4_4.

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Hencher, Steve. "Geotechnical parameters." In Practical Engineering Geology, 342–97. 2nd ed. London: CRC Press, 2024. http://dx.doi.org/10.1201/9781003348894-7.

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Koerner, Robert M. "Geosynthetics in Geotechnical Engineering." In Foundation Engineering Handbook, 796–813. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4615-3928-5_22.

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French, Hugh M. "Geotechnical and Engineering Aspects." In The Periglacial Environment, 349–72. West Sussex, England: John Wiley & Sons Ltd,., 2013. http://dx.doi.org/10.1002/9781118684931.ch14.

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Pappin, Jack. "Geotechnical Structures." In Modeling Complex Engineering Structures, 103–35. Reston, VA: American Society of Civil Engineers, 2007. http://dx.doi.org/10.1061/9780784408506.ch05.

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Evans, Jeffrey, Daniel Ruffing, and David Elton. "Geotechnical fundamentals." In Fundamentals of Ground Improvement Engineering, 21–58. London: CRC Press, 2021. http://dx.doi.org/10.1201/9780367816995-2.

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Conference papers on the topic "Geotechnical engineering"

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Dardak, A. H. "GEOTECHNICAL ENGINEERING REVIEW: HIGHWAY DEVELOPMENT AND GEOTECHNICS." In Proceedings of the 3rd and 5th International Conference. WORLD SCIENTIFIC, 2011. http://dx.doi.org/10.1142/9789814365161_0002.

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Janardhanam, R. "Geotechnical Forensic Engineering." In Indo-U.S. Forensic Engineering Workshop. Reston, VA: American Society of Civil Engineers, 2010. http://dx.doi.org/10.1061/41149(393)4.

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"Civil engineering and geotechnical engineering." In 2007 International Forum on Strategic Technology. IEEE, 2007. http://dx.doi.org/10.1109/ifost.2007.4798645.

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Fenton, Gordon A., and D. V. Griffiths. "Reliability-Based Geotechnical Engineering." In GeoFlorida 2010. Reston, VA: American Society of Civil Engineers, 2010. http://dx.doi.org/10.1061/41095(365)2.

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Fahmy, Dr Ahmed. "Forensic Geotechnical Engineering Challenges." In International Conference on Civil Engineering Fundamentals and Applications (ICCEFA'20). Avestia Publishing, 2020. http://dx.doi.org/10.11159/iccefa20.02.

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Abdelhamid, Sherif E., Sherif Abdelaziz, and Ahmed Elbasyouny. "Geotechnical Engineering Cyberinfrastructure (GTCI)." In Geo-Congress 2022. Reston, VA: American Society of Civil Engineers, 2022. http://dx.doi.org/10.1061/9780784484067.056.

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Fiegel, Gregg L., and Jay S. DeNatale. "Hands-On Undergraduate Geotechnical Engineering." In Geo-Denver 2000. Reston, VA: American Society of Civil Engineers, 2000. http://dx.doi.org/10.1061/40522(297)7.

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Shuku, Takayuki. "Sparse Modeling in Geotechnical Engineering." In Proceedings of the 7th International Symposium on Geotechnical Safety and Risk (ISGSR 2019). Singapore: Research Publishing Services, 2019. http://dx.doi.org/10.3850/978-981-11-2725-0-bs3-cd.

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Barker, John, and Howard Thomas. "Geotechnical Engineering in Cold Regions." In 10th International Symposium on Cold Regions Development. Reston, VA: American Society of Civil Engineers, 2013. http://dx.doi.org/10.1061/9780784412978.020.

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DeJong, Jason T., Matthew Burrall, Daniel W. Wilson, and J. David Frost. "A Bio-Inspired Perspective for Geotechnical Engineering Innovation." In Geotechnical Frontiers 2017. Reston, VA: American Society of Civil Engineers, 2017. http://dx.doi.org/10.1061/9780784480472.092.

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Reports on the topic "Geotechnical engineering"

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Das, B., M. Y. Fisekci, and N. Stuart. Geotechnical engineering discussion document. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1986. http://dx.doi.org/10.4095/304913.

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Mohan, Varenya Kumar Duvvuru, Monica Prezzi, and Bob McCullouch. Analysis of Change Orders in Geotechnical Engineering Work at INDOT. Purdue University Press, 2011. http://dx.doi.org/10.5703/1288284314623.

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Raja, Rameez Ali, Vidushi Toshniwal, and Rodrigo Salgado. GIS-Based Geotechnical Database for Collaborative GIS. Purdue University, 2023. http://dx.doi.org/10.5703/1288284317637.

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INDOT spends at least 8 million dollars annually on geotechnical site investigations, not including the amounts spent by contractors. The laborious and costly job of data collection in geotechnical practice requires the efficient storing and organizing of this valuable data to develop correlations and trends in spatially varying geotechnical data. INDOT currently uses gINT software for managing geotechnical data and ArcGIS for storing boring logs and geotechnical reports. The INDOT geotechnical office is pursuing means to improve the efficiency of their operations by developing a GIS-based geotechnical database for secure storage, easy retrieval, and flexible sharing of geotechnical data to enhance decision making. SPR-4616 is the first step towards the development of a geotechnical data management system in which important decisions on the components and structure of the database were made. The report presents a detailed conceptual layout for the development of a geotechnical database following an object-oriented programming approach. The report discusses in detail the geotechnical applications, the field, laboratory, and verification tests that will be included in the database. The geotechnical variables required to perform the engineering analysis in designing specific applications are logically linked with the geotechnical tests from which they are obtained. Lastly, a detailed layout of the proposed database structure and a user workflow example is provided in the report and can serve as a guide during the development of the database system.
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CORPS OF ENGINEERS WASHINGTON DC. Engineering and Design: Project Geotechnical and Concrete Materials Completion Report for Major USACE Projects. Fort Belvoir, VA: Defense Technical Information Center, February 1999. http://dx.doi.org/10.21236/ada404368.

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Amin, J. A., R. C. Chen, and J. S. Mulliken. Impact of new K Area geotechnical parameters on K Reactor restart response spectra. Seismic Structural Engineering. Office of Scientific and Technical Information (OSTI), August 1991. http://dx.doi.org/10.2172/10159173.

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Dinovitzer, Aaron. PR-214-154503-R01 Pipeline Strains Induced by Slope Movement. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), August 2019. http://dx.doi.org/10.55274/r0011609.

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Pipeline integrity may be affected by the action of the external soil loads that can be generated by ground movements or slope failures and the structural integrity threat of these geotechnical failures is not well understood. The threat presented to a pipeline by a localized slope failure is not directly related to magnitude of the soil movement involved, but related to the stress and strains induced in the pipeline by the moving soil block. This project demonstrated and applied advanced pipe-soil interaction numerical modeling tools in the assessment of slope movements directed long the pipeline axis. The geotechnical hazard assessments completed in this project provide a conservative means of estimating the pipeline axial strain accumulation resulting from slope movements. These modeling results are presented such that an understanding of the influence of pipeline, slope and operational parameters on strain accumulation is demonstrated and the relative importance of each parameter is demonstrated. The relationship between surface expression of a geotechnical event and the subsurface parameters to facilitate conservative characterization of the event is defined. The data describing axial strain as a function of ground movement magnitude presented in this project may be compared to the axial strain capacity (resistance) engineering tools to evaluate the significance of slope movements on pipeline integrity.
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Quinn, Meghan. Geotechnical effects on fiber optic distributed acoustic sensing performance. Engineer Research and Development Center (U.S.), July 2021. http://dx.doi.org/10.21079/11681/41325.

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Distributed Acoustic Sensing (DAS) is a fiber optic sensing system that is used for vibration monitoring. At a minimum, DAS is composed of a fiber optic cable and an optic analyzer called an interrogator. The oil and gas industry has used DAS for over a decade to monitor infrastructure such as pipelines for leaks, and in recent years changes in DAS performance over time have been observed for DAS arrays that are buried in the ground. This dissertation investigates the effect that soil type, soil temperature, soil moisture, time in-situ, and vehicle loading have on DAS performance for fiber optic cables buried in soil. This was accomplished through a field testing program involving two newly installed DAS arrays. For the first installation, a new portion of DAS array was added to an existing DAS array installed a decade prior. The new portion of the DAS array was installed in four different soil types: native fill, sand, gravel, and an excavatable flowable fill. Soil moisture and temperature sensors were buried adjacent to the fiber optic cable to monitor seasonal environmental changes over time. Periodic impact testing was performed at set locations along the DAS array for over one year. A second, temporary DAS array was installed to test the effect of vehicle loading on DAS performance. Signal to Noise Ratio (SNR) of the DAS response was used for all the tests to evaluate the system performance. The results of the impact testing program indicated that the portions of the array in gravel performed more consistently over time. Changes in soil moisture or soil temperature did not appear to affect DAS performance. The results also indicated that time DAS performance does change somewhat over time. Performance variance increased in new portions of array in all material types through time. The SNR in portions of the DAS array in native silty sand material dropped slightly, while the SNR in portions of the array in sand fill and flowable fill material decreased significantly over time. This significant change in performance occurred while testing halted from March 2020 to August 2020 due to the Covid-19 pandemic. These significant changes in performance were observed in the new portion of test bed, while the performance of the prior installation remained consistent. It may be that, after some time in-situ, SNR in a DAS array will reach a steady state. Though it is unfortunate that testing was on pause while changes in DAS performance developed, the observed changes emphasize the potential of DAS to be used for infrastructure change-detection monitoring. In the temporary test bed, increasing vehicle loads were observed to increase DAS performance, although there was considerable variability in the measured SNR. The significant variation in DAS response is likely due to various industrial activities on-site and some disturbance to the array while on-boarding and off-boarding vehicles. The results of this experiment indicated that the presence of load on less than 10% of an array channel length may improve DAS performance. Overall, this dissertation provides guidance that can help inform the civil engineering community with respect to installation design recommendations related to DAS used for infrastructure monitoring.
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8

Gunning, A. P., and G. M. Reeves. Development & application of a borehole close circuit televideo (CCTV) system & data capture for shallow geotechnical engineering applications. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1994. http://dx.doi.org/10.4095/193964.

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9

Morgan. L51992 Centrifuge Modeling of Frost Heave of Chilled Buried Pipelines. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), March 2005. http://dx.doi.org/10.55274/r0010951.

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This project considers some of the geotechnical and geothermal engineering issues that will need to be considered for the design and construction of large diameter gas transmission pipelines from the arctic production areas to southern markets. The challenges relate to determination of the frost heave and thaw settlement behaviour of a pipeline as it crosses from areas of continuous permafrost, through discontinuous zones to completely unfrozen ground conditions. The use of chilled gas will overcome some problems in already frozen ground but will cause frost heave where a frost bulb is formed through unfrozen ground. A series of centrifuge tests to model a 1.22m (48�) diameter pipeline, 25m (82) long has been performed to investigate the effects of frost heave on chilled buried gas pipelines. The use of centrifuge tests allows reduced scale models to be tested under similar geotechnical stress conditions and in significantly shorter duration than at full-scale. In addition, the use of engineered artificial soil allows a range of site conditions to be investigated.
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10

Overbey, W. K. Jr, T. K. Reeves, S. P. Salamy, C. D. Locke, H. R. Johnson, R. Brunk, and L. Hawkins. A novel geotechnical/geostatistical approach for exploration and production of natural gas from multiple geologic strata, Phase 1. Volume 2, Geology and engineering. Office of Scientific and Technical Information (OSTI), May 1991. http://dx.doi.org/10.2172/10152997.

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