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Dissertations / Theses on the topic 'Piling (Civil engineering)'

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Published: 4 June 2021
Last updated: 31 July 2024

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1

Wong, Eric Yi-wai. "Behaviour of large-diameter bored pile groups with defects /." View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202004%20WONG.

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2

Lam, Joley. "Termination criteria for high-capacity jacked and driven steel H-piles in Hong Kong." View the Table of Contents & Abstract, 2007. http://sunzi.lib.hku.hk/hkuto/record/B38027811.

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3

Tam, Sze-yuen. "A case study of site investigation for piling in karstic bedrock at Yuen Long, Hong Kong." Click to view the E-thesis via HKUTO, 2001. http://sunzi.lib.hku.hk/hkuto/record/B43894628.

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4

Wong, Man-kie. "A study of capacity predictions for driven piles by dynamic pile testing." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B37106120.

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5

Luk, Ka-sing. "Design and construction related defects of large diameter bored piles, prevention and remedial measures." Click to view the E-thesis via HKUTO, 2004. http://sunzi.lib.hku.hk/hkuto/record/B42577652.

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6

Chan, Fai. "Termination criteria for and behaviour of jacked piles in completely decomposed granite /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202005%20CHANF.

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7

Shek, Man Pong. "Driveability and performance of long driven piles founded in saprolites /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202005%20SHEK.

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8

Choi, Sin Yi. "Improving termination criteria for press-in pile construction focusing on setup effects and cyclic loading effects /." View abstract or full-text, 2008. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202008%20CHOI.

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9

Chan, Chung Yie. "Centrifuge modelling of behaviour of piles in consolidating ground /." View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202004%20CHAN.

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Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2004.
Includes bibliographical references (leaves 180-185). Also available in electronic version. Access restricted to campus users.
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10

Cheng, Chin Pang. "Designing the depth of reinforced concrete rigid-pile caps for tall buildings /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202005%20CHENG.

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11

Wong, Ming Hoi. "Investigation of capacity, interactions and failure criteria of jacked pile groups in sand by centrifuge modelling /." View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202004%20WONGM.

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Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2004.
Includes bibliographical references (leaves 146-151). Also available in electronic version. Access restricted to campus users.
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12

Yung, Keung-Shing. "Piling design and construction in Hong Kong." Click to view the E-thesis via HKUTO, 2001. http://sunzi.lib.hku.hk/hkuto/record/B4257609X.

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13

Su, Dong. "Centrifuge investigation on responses of sand deposit and sand-pile system under multi-directional earthquake loading /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202005%20SU.

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14

Wang, Yaohui. "Behavior of socketed steel H-piles." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B36761400.

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15

Wang, Yaohui, and 王耀輝. "Behavior of socketed steel H-piles." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B36761400.

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16

Lam, Joley, and 林早妮. "Termination criteria for high-capacity jacked and driven steel H-pilesin Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B38346461.

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17

Wong, Man-kie, and 黃文基. "A study of capacity predictions for driven piles by dynamic pile testing." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B37106120.

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18

Xu, Yao. "Calibration of settlement analysis models for single piles and pile groups /." View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202006%20XUY.

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19

Chu, Lai Fan. "Calibration of design methods for large-diameter bored piles for limit state design code development /." View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202007%20CHU.

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20

Chu, Kei Hong. "Verticality effect and performance of very long driven piles /." View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202009%20CHU.

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21

Yiu, Wai-kei Ricky. "Mini piles design and construction in current engineering practice." View the Table of Contents & Abstract, 2001. http://sunzi.lib.hku.hk/hkuto/record/B3010757X.

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22

DeLano, John Gordon. "Behavior of Pile-Supported Integral Abutments at Bridge Sites with Shallow Bedrock." Fogler Library, University of Maine, 2004. http://www.library.umaine.edu/theses/pdf/DeLanoJG2004.pdf.

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23

Luk, Ka-sing, and 陸家聲. "Design and construction related defects of large diameter bored piles,prevention and remedial measures." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B42577652.

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24

Yung, Keung-Shing, and 翁強盛. "Piling design and construction in Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B4257609X.

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25

Yu, Feng. "Behavior of large capacity jacked piles Da he zai jing ya zhuang de ji li /." Click to view the E-thesis via HKUTO, 2004. http://sunzi.lib.hku.hk/hkuto/record/B31450866.

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26

Wang, Dong. "Investigation of laterally loaded pile in sands using DEM." Thesis, University of Macau, 2012. http://umaclib3.umac.mo/record=b2586268.

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27

Davies, Michael Paul. "Predicting axially and laterally loaded pile behaviour using in-situ testing methods." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26689.

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The prediction of axial and lateral pile behaviour is a complex engineering problem. Traditional methods of data collection and subsequent analyses are frequently in error when compared to full-scale, load tests. In-situ testing, using advanced electronic tools, provides a means by which representative field data may be obtained. This study investigates the use of such in-situ data in predicting axially loaded pile capacity and laterally loaded pile load-deflection behaviour. A total of twelve static axial pile capacity methods were evaluated to predict the results obtained from eight full-scale pile load tests on six different piles. These methods, separated into direct and indirect classes, used data obtained from the cone penetration test. Extensive use of commercially available microcomputer software significantly simplified the analyses. In addition, several dynamic pile capacity predictions are presented including results from in-situ dynamic measurements obtained with a pile driving analyzer during pile emplacement. An attempt has been made, with the use of tell-tales, to differentiate the shaft resistance and end-bearing components of the load test results. These results are then compared to the prediction methods investigated. Two methods of predicting lateral load-deflection behaviour using in-situ data have been investigated. One method uses pressuremeter test data and the other, a new method proposed in this study, uses full-displacement flat plate dilatometer test data. These predictions are compared with full-scale lateral load tests on three piles of differing size. In both the axial and lateral load cases, the preferred method(s) of analyses are identified. It is shown that excellent agreement can be obtained for predicting measured pile behaviour using several methods. The limitations of this study are noted, and recommendations for further research are proposed.
Applied Science, Faculty of
Civil Engineering, Department of
Graduate
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28

She, Jairus Lai Yan. "Prediction of P-Y curves from finite element analyses." Thesis, University of British Columbia, 1986. http://hdl.handle.net/2429/26736.

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The prediction of P-Y curves for undrained clay and sand based on the results of finite element analyses is presented in this thesis. A higher-ordered finite element program was used in the analyses. The ability of the program to accurately model the undrained soil condition was verified by comparing predicted load-deflection responses with closed form solutions for the cylindrical cavity expansion problem. Pressuremeter curves were predicted from plane strain axisymmetric finite element analyses. The effect of pressuremeter size on the predicted results was examined. P-Y curves were predicted for plane strain and plane stress conditions. Values for the initial slope and Pun- of the curves were obtained. The curves were normalized for comparison, and simplified methods presented for determining P-Y curves. Finite element predictions for the pressuremeter and laterally loaded pile problems were also compared. Factors were determined from these comparisons to generate P-Y curves from pressuremeter curves.
Applied Science, Faculty of
Civil Engineering, Department of
Graduate
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29

Dewberry, Gregory Jack. "Use of low-strain dynamic tests to estimate the performance of axially loaded piles." Thesis, Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/21271.

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30

So, Hin-ting Simon, and 蘇顯庭. "Comparison of pile loading test results of instrumented frictional H-piles with predictions from classical theory of pile capacityequations." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B30431657.

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31

Yu, Feng, and 俞峰. "Behavior of large capacity jacked piles=." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B31450866.

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32

Lee, Wai-cho, and 李偉祖. "A numerical investigation of reduction in capacity of driven H-piles due to deviations from vertical." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B42577639.

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33

Ng, Kwok-chu David. "Large diameter pile load tests in Hong Kong : a contractor's perspective /." Click to view the E-thesis via HKUTO, 2003. http://sunzi.lib.hku.hk/hkuto/record/B42577226.

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34

Lee, Wai-cho. "A numerical investigation of reduction in capacity of driven H-piles due to deviations from vertical." Click to view the E-thesis via HKUTO, 2004. http://sunzi.lib.hku.hk/hkuto/record/B42577639.

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35

Guo, Dajiang. "Infinite layer method and its application to the analysis of pile systems /." [Hong Kong : University of Hong Kong], 1988. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12361343.

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36

Tam, Sze-yuen, and 譚思遠. "A case study of site investigation for piling in karstic bedrock at Yuen Long, Hong Kong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B43894628.

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37

Ooi, Lean Hock. "The interface behaviour of socketed piles." Thesis, The University of Sydney, 1989. http://hdl.handle.net/2123/5408.

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38

Chan, Sze Ho. "Negative skin friction on piles in consolidating ground /." View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202006%20CHAN.

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39

Kong, Linggang. "Behaviour of pile groups subjected to torsion /." View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202006%20KONG.

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40

Shu, Shanzhi. "Sand state and performance analysis of micropiles." Online access for everyone, 2005. http://www.dissertations.wsu.edu/Dissertations/Fall2005/s%5Fshu%5F121005.pdf.

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41

Ng, Kwok-chu David, and 吳國柱. "Large diameter pile load tests in Hong Kong: a contractor's perspective." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B42577226.

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42

Yu, Zhenxiong, and 余振雄. "Behavior of a piled cap foundation under a vertical loading." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B47849861.

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Hong Kong is a small city with a dense population. Due to limited land resources and dense population, skyscrapers are built to meet the commercial and residential needs. To fulfill the functional requirements, the superstructure is usually supported by piles through a thick cap. A bored pile foundation is one of the most common deep foundation systems with a high capacity adopted in Hong Kong. Most of those piles are founded on Grade III or better rock. However, as lack of field experience and high quality database, the behavior of such pile foundation system is still unclear. These bored piles are designed as the end bearing piles. In addition, the load distribution among the piles and the load shared by the pile cap are also not properly addressed in the local design. In order to properly address the above-mentioned issues related to the design of pile foundation, in particular for large diameter bored piles, a comprehensive field study was launched. Furthermore, the numerical simulations were also carried out. A comprehensive field study was carried out on the behavior of a building supported by large diameter bored piles. The building (40-storey public housing) is Y-shaped with three wings (Wing A, Wing B, and Wing C) and a central core (Central Core). The superstructure is resting on a Y-shaped foundation cap (2.3m in thickness) which is supported by 18 bored piles (2.2m in diameter). The piles terminated at Grade III or better rocks. The field test results indicated that the pile group took up most of the applied load, while the cap had an insignificant contribution to the capacity of the foundation system. The axial force in the pile increased from the outer edge to the inner area of the cap. The shaft resistances mobilized in the soil layer and the rock layer were significant. As a result, the axial force reduced to a not significant level at the toe. The finite element model could generally reflect the bored pile deformation and the load distribution along the pile. The numerical simulation results could generally reveal the load distribution among the piles. Based on the numerical analyses, the load distribution among the piles was strongly dependent on the cap stiffness. Moreover, when some pile stiffness reduced, the applied load will redistribute among the piles. More loads will transfer to the nearby stiff piles. The effected region of redistribution in axial force increased with the cap stiffness.
published_or_final_version
Civil Engineering
Master
Master of Philosophy
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43

Wang, Shenzhi, and 王慎之. "Field monitoring and numerical analysis on piled-raft foundation : case study." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/209499.

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This thesis presents the result of detailed back-analysis, using three-dimensional finite-element analysis, of the instrumented piled-raft foundation in monitoring site. The piled-raft foundation is a composite foundation structure that consisting of piles, raft and surrounding soils acting as a whole system. To check the reliability of soil taking load under the raft and obtain a reasonable value of load proportion taken by piles for the soil conditions in Hong Kong, a piled-raft foundation was partially instrumented in the monitoring site. The pile head loading, raft-soil contact pressure of specified area and settlement at raft top for selected locations were being monitored. Comparisons of overall settlement, differential settlements and the load carried by the piles show reasonably good agreement. Followed by a 3D finite element modeling of the entire piled-raft foundation of the monitored site, the analysis includes a pile-soil slip interface model. The numerical analysis is performed to give insights to (1) load transfer behavior of the piled-raft foundation (2) effects of pile reduction on pile load ratio. Combined the observation from site monitoring and analysis results from the numerical analysis, the proportion of load shared between piles and raft is revealed as 7:3. The lower limit of pile ratio is proposed as 0.67 for the site after the parametric study by removing piles strategically. In spite of the settlement-reducing purpose of the piles, the design of piled-raft foundation still concentrate on providing adequate axial capacity, with settlement requirement treated as a secondary issue. The significance of the study is that it provides factual evidence of soil taking the load under the raft, and the economical benefits of piled-raft foundation as a reduction of piles will save more than 2 million of the construction budgets.
published_or_final_version
Civil Engineering
Master
Master of Philosophy
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44

Sears, Brian K. "Pile downdrag during construction of two bridge abutments /." Diss., CLICK HERE for online access, 2008. http://contentdm.lib.byu.edu/ETD/image/etd2638.pdf.

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45

Dithinde, Mahongo. "Characterisation of model uncertainty for reliability-based design of pile foundations." Thesis, Stellenbosch : Stellenbosch University, 2007. http://hdl.handle.net/10019.1/21612.

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Dissertation (PhD)--University of Stellenbosch, 2007.
ENGLISH ABSTRACT: To keep pace with international trends, the introduction of geotechnical limit state design in South Africa is inevitable. To pave the way for implementation of limit state pile design in the country, the study quantifies model uncertainty in the classic static pile design formula under the Southern African geologic environment. The generated model uncertainty statistics are used to calibrate partial resistance factors in a reliability-based design framework. A series of pile performance predictions by the static formula are compared with measured performances. To capture the distinct soil types for the geologic region of Southern Africa as well as the local pile design and construction experience base, pile load tests and associated geotechnical data from the Southern African geologic environment are used. The methodology of collecting, compiling, and analyzing the pile load tests to derive the measured ultimate pile capacities is described. To facilitate the computation of the theoretical capacities, the site specific geotechnical data in the database are transformed to the desired engineering soil properties through well established empirical correlations. For a given pile test case, model uncertainty is presented in terms of a model factor computed as the ratio of the measured to the theoretical capacity, leading to n realisations of the model factor. To facilitate further interpretation and generalisation of the model factor realisation data, statistical analysis is carried out. The statistical analysis comprises of graphical representation by histograms, outliers detection and correction of erroneous values, and using the corrected data to compute the sample moments (mean, standard deviations, skewness and kurtosis) needed in reliability analysis. The analyses demonstrate that driven piles depict higher variability compared to bored piles irrespective of materials type. Furthermore, for a given pile installation method (driven or bored) the variability in non-cohesive materials is higher than that in cohesive materials. In addition to the above statistics, reliability analysis requires the theoretical probability distribution for the random variable under consideration. Accordingly it is demonstrated that the lognormal distribution is the most appropriate theoretical model for the model factor. Another key basis for reliability theory is the notion of randomness of the basic variables. To verify that the variation in the model factor is not explainable by deterministic variations in the database, an investigation of correlation of the model factor with underlying pile design parameters is carried out. It is shown that such correlation is generally weak. Correlation can have a significant impact on the calculated reliability index if not accounted for. Accordingly, the effects of the exhibited correlation is investigated through an approach based on regression theory in which systematic effects of design parameters are taken into account (generalised model factor). The model factor statistics from the conventional approach and those from the generalised model factor approach are used to determine reliability indexes implied by the current design practice. It is demonstrated that no significant improvement in values of the reliability indexes is gained by taking into account the effects of the weak correlation. The model factor statistics derived on the basis of the standard model factor approach are used to calibrate resistance factors. Four first order reliability methods are employed for the calibration of resistance factors. These include; the Mean Value First-Order Second Moment approach, an Approximate Mean Value First-Order Second Moment approach, the Advanced First-Order Second Moment approach using Excel spreadsheet, and the Advanced First-Order Second Moment approach (design point method). The resistance factors from the various calibration methods are presented for the target reliability index values of 2.0, 2.5, and 3.0. The analyses of the results demonstrate that for a given target reliability index, the resistance factors from the different methods are comparable. Furthermore, it is shown that for a given material type, the resistance factors are quite close irrespective of the pile installation method, suggesting differentiation of partial factors in terms of materials types only. Finally, resistance factors for use in probabilistic limit state pile design in South Africa are recommended.
AFRIKAANSE OPSOMMING: Ten einde in pas te bly met internasionale neigings, is dit onafwendbaar dat geotegniese limietstaat-ontwerp in Suid Afrika ingevoer word. Ter voorbereiding vir die plaaslike toepassing van limietstaatontwerp op heipale, kwantifiseer hierdie ondersoek onsekerheid rondom die model vir klassieke statiese heipaalontwerpformules in die Suid Afrikaanse geologiese omgewing. Die statistiek van modelonsekerheid wat gegenereer is, word gebruik om parsiële weerstandsfaktore in ’n betoubaarheid-gebasseerde ontwerpraamwerk te kalibreer. ’n Reeks voorspellings van die gedrag van heipale volgens die statiese formules word vergelyk met die gemete gedrag. Om die kenmerkende grond-tipes in die geologiese gebied van Suidelike Afrika sowel as die plaaslike ondervinding met heipaalontwerp en - konstruksie vas te lê, word heipaaltoetse en die gassosieerde geotegniese data vanuit hierdie geologiese omgewing gebruik. Die metodiek vir die versameling, saamstelling en analise van heipaaltoetse om uiterste kapasiteite daarvan te bepaal, word beskryf. Terreinspesifieke geotegniese data in die databasis word getransformeer na die vereisde ingenieurseienskappe volgens gevestigde empiriese korrelasies. Vir ’n gegewe heipaaltoets word modelonsekerheid weergegee in terme van ’n modelfaktor wat bereken word as die verhouding van die gemete tot die teoretiese kapasiteit waaruit n uitkomstes van die modelfaktor dus gegenereer word. Om verdere interpretasie en veralgemening van die modelfaktordata te vergemaklik, word ’n statistiese analise daarop uitgevoer. Die statistiese analise bestaan uit grafiese voorstellings deur middel van histogramme, uitkenning van uitskieters en verbetering van foutiewe waardes, waarna die statistiese momente (gemiddeld, standaardafwyking, skeefheid en kurtose) vir gebruik in betroubaarheidsanalise bereken word. Volgens die analises toon ingedrewe heipale ’n groter veranderlikheid as geboorde pale, ongeag die grondtipe. Verder is die veranderlikheid van heipale in kohesielose materiale hoër as in kohesiewe materiale, ongeag die installasiemetode (ingedrewe of geboor). Bykomend tot bogemelde statistiek, vereis betroubaarheidsanalise die teoretiese waarskynlikheidsdistribusie van die ewekansige veranderlike onder beskouing. Ooreenkomstig word illustreer dat die log-normale verspreiding die mees toepaslike verspreiding vir die modelfaktor is. ’n Verdere sleutelvereiste vir betroubaarheidsteorie is die mate van ewekansigheid van die basiese veranderlikes. Om te bepaal of die variasie in die modelfaktor nie deur deterministiese veranderlikes in die databasis verduidelik kan word nie, word ’n ondersoek na die korrelasie van die modelfaktor met onderliggende heipaalontwerpfaktore uitgevoer. Sodanige korrelasie is in die algemeen as laag bevind. Korrelasie kan ’n belangrike invloed op die berekende betroubaarheidsindeks hê indien dit nie in ag geneem word nie. Dienooreenkomstig word die effek van die getoonde korrelasie ondersoek met behulp van die metode van regressie-analise waarin sistematiese effekte van ontwerpparameters in berekening gebring word (veralgemeende modelfaktor). Die modelfaktorstatistiek wat volg uit die konvensionele benadering en dié van die veralgemeende benadering word gebruik om betroubaarheidsindekse te bepaal wat deur die bestaande ontwerppraktyk geïmpliseer word. Die bevinding is dat daar nie ’n noemenswaardige verbetering in die waardes van die betroubaarheidsindekse is wanneer die effek van die swak korrelasie in berekening gebring word nie. Die statistiek van die modelfaktor wat afgelei is volgens die standaardbenadering word gebruik om die weerstandsfaktore te kalibreer. Vier eerste-orde betroubaarheidsmetodes word gebruik om die weerstandsfaktore te kalibreer, naamlik die Gemiddelde Waarde Eerste-Orde Tweede Moment benadering, die Benaderde Gemiddelde Waarde Eerste-Orde Tweede Moment benadering, die Gevorderde Eerste-Orde Tweede Moment benadering waarin ’n Excel sigblad gebruik word en die Gevorderde Eerste-Orde Tweede Moment benadering (die ontwerppuntmetode). Die weerstandsfaktore vanaf die verskillende kalibrasiemetodes word weergegee vir waardes van 2.0, 2.5 en 3.0 van die teikenbetroubaarheidsindeks. ’n Ontleding van die resultate toon dat vir ’n gegewe teiken betroubaarheidsindeks die weerstandsfaktore vanaf die verskillende metodes vergelykbaar is. Verder word getoon dat vir ’n gegewe grondsoort, die weerstandsfaktore vir verskillende metodes van installasie van die heipaal nie veel verskil nie. Dit wil dus voorkom asof parsiële faktore in terme van die grondsoort uitgedruk kan word. Ten slotte word weerstandsfaktore vir gebruik in plastiese limietstaatontwerp van heipale in Suid Afrika aanbeveel.
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46

Ng, Tsz Man. "Optimization of pile group foundations in non-linear soil using hybrid genetic algorithms /." View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202006%20NG.

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47

So, Kong-On. "Performance of high capacity long driven H-piles in weathered soils /." View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202009%20SO.

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48

Yan, Li. "Hydraulic gradient similitude method for geotechnical modelling tests with emphasis on laterally loaded piles." Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/31899.

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Abstract:
A study has been undertaken to evaluate and apply the hydraulic gradient similitude method to geotechnical model testings. This method employs a high hydraulic gradient across granular soils to effectively increase self-weight stresses in the model. Testing principle and procedures are presented, and the factors affecting test results discussed. An apparatus (UBC-HGST) using this testing principle has been developed. Three applications are presented in which the hydraulic gradient similitude method is evaluated, and the existing concepts and methods of analysis for the problems studied are examined. In the footing tests, it is found that the scaling laws implied in the hydraulic gradient modelling test are satisfied, and are similar to those of the centrifuge modelling technique. Load-settlement curves are found to be similar to those in centrifuge tests. The test results illustrate the importance of the stress level in the load-settlement responses. Terzaghi's bearing capacity formula is compared with the observed bearing capacities under different stress levels. It is found that due to the stress level effects, the bearing capacity coefficient, Nγ, decreases linearly with footing width on the log-log scale which is in accordance with other model study and analytical results. In the downhole and crosshole seismic tests, results are used to evaluate the empirical equations that relate shear wave velocity and soil stresses in terms of field stress condition. It is found that although the various equations can predict the insitu shear wave velocity profile reasonably well, only the equation which is based on the significant stresses in the wave propagation and particle motion directions can predict the variation of velocity ratio between the downhole and SH crosshole tests. It is also found that the stress ratio has some effects on the downhole (or SV crosshole) tests, but not on the SH crosshole tests. This indicates that only the stress ratio in the plane of wave propagation is important to the shear wave velocity. Comparison between the downhole and SH crosshole tests shows that the structure anisotropy was about 10% in terms of shear wave velocity. Prediction of Ko values using shear wave measurement is evaluated, and its practical difficulties are addressed. In the laterally loaded pile tests, the pile response to static and cyclic loadings at various stress levels controlled by the hydraulic gradients is examined in terms of pile head response, pile bending moment and soil-pile interaction P-y curves. For the static loading, pile head response and bending moment are found to be significantly affected by the soil-pile relative stiffness, pile diameter, loading condition and pile head fixity. However, little effects of loading eccentricity and pile head fixity are found on the P-y curves. While pile diameter is found to have effects on the P-y curves at large pile deflection, its effects are negligible at small deflecton range. The effects of relative soil-pile stiffness on the P-y curves due to stress levels can be normalized by the soil modulus and pile diameter for the curves below 1 pile diameter, as computed by the plane strain finite element analysis. Two methods of generating P-y curves are suggested, and found to give satisfactory results as compared with the test data and the prediction given by API code (1987). For cyclic loading, different pile responses are observed in "one-way" as compared to "two-way" cyclic loading. The cyclic P-y curves are derived, and found to be highly nonlinear and hysteretic, and change with number of loading cycles. From these studies, it is shown that the hydraulic gradient similitude method provides a simple and inexpensive means of model testing for many geotechnical engineering problems and adds to the data base from which methods of analysis can be evaluated.
Applied Science, Faculty of
Civil Engineering, Department of
Graduate
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49

Hill, Jacob Wayne. "Evaluation of load tests for driven piles for the Alabama Department of Transportation." Auburn, Ala., 2007. http://repo.lib.auburn.edu/2007%20Spring%20Theses/HILL_JACOB_38.pdf.

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50

Mu, Feng. "Analysis and prediction of the axial capacity and settlement of displacement piles in sandy soil." Click to view the E-thesis via HKUTO, 2007. http://sunzi.lib.hku.hk/HKUTO/record/B39558988.

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