Rozprawy doktorskie na temat „Clay compaction”
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Catana, M. Cevat. "Compaction and water retention characteristics of Champlain sea clay". Thesis, University of Ottawa (Canada), 2006. http://hdl.handle.net/10393/27337.
Pełny tekst źródłaDuval, Jean. "Assessing porosity characteristics as indicators of compaction in a clay soil". Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59275.
Pełny tekst źródłaThe tests used were: total porosity as calculated from densimeter readings and from soil cores; structural porosity; water desorption characteristics; and soil profile examination. These tests were performed in three layers of 20 cm and evaluation was based on their practicality and their ability to differentiate between treatments and to correlate with corn yield.
The results confirm that total porosity is a poor indicator of compaction in the subsoil. In soil profile assessments, ped descriptions were preferable to examination of pores. Water content and saturation deficit at $-$4.0 and $-$100 kPa were the best indicators of treatments and plant response.
Okiongbo, Kenneth Samuel. "Volumetrics of petroleum generation and compaction of the Kimmeridge Clay Formation". Thesis, University of Newcastle Upon Tyne, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.417523.
Pełny tekst źródłaAndras, Peter. "The role of clay mineral diagenesis in overpressure generation and compaction of siliciclastic mudstones". Thesis, Durham University, 2018. http://etheses.dur.ac.uk/12531/.
Pełny tekst źródłaLokre, Chinmay Vivekananda. "Effect of Density, Initial Water Content, Drying Temperature, Layer Thickness, and Plasticity Characteristics on Shrinkage Crack Development in Clay Soils: An Experimental Study". Kent State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=kent1557423451910154.
Pełny tekst źródłaTilgen, Huseyin Pars. "Relationship Between Suction And Shear Strength Parameters Of Compacted Metu Campus Clay". Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/1300425/index.pdf.
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) and soil suctions were measured by filter paper method after direct shear tests. These relationships were also investigated on soaked samples. The trends for suction, angle of internal friction and cohesion, which change on the dry side and wet side of optimum moisture content, were analyzed. The compacted METU campus clay gains granular soil fabric at the dry side of optimum moisture content. As moisture content increases, cohesion increases up to optimum moisture content and then decreases. But angle of internal friction decreases as moisture content increases. Soaking affects the samples more which are on the dry side of optimum moisture content. The soil suction (total suction and matric suction) affects the shear strength, and an increase in soil suction increases the shear strength.
NAKANO, MASAKI, AKIRA ASAOKA i TOSHIHIRO NODA. "SOIL-WATER COUPLED FINITE DEFORMATION ANALYSIS BASED ON A RATE-TYPE EQUATION OF MOTION INCORPORATING THE SYS CAM-CLAY MODEL". 地盤工学会, 2008. http://hdl.handle.net/2237/20062.
Pełny tekst źródłaAli, Hatim F. A. "Assessment of lime-treated clays under different environmental conditions". Thesis, University of Bradford, 2019. http://hdl.handle.net/10454/18313.
Pełny tekst źródłaTAKAGI, Kenji, 光夫 野津, Mitsuo NOZU, 利弘 野田, Toshihiro NODA, 敏浩 高稲, Toshihiro TAKAINE i 健次 高木. "水~土連成計算を用いた砂杭拡径による砂地盤の締固めメカニズムの一考察". 土木学会, 2001. http://hdl.handle.net/2237/8642.
Pełny tekst źródłaLtifi, Mounir. "Étude expérimentale du vieillissement d'un sol argileux". Vandoeuvre-les-Nancy, INPL, 1998. http://www.theses.fr/1998INPL103N.
Pełny tekst źródłaTorres, Montesinos Sergio Feliciano, i Alarcon Jacques Yitzhak Landa. "Mejoramiento de suelos arcillosos en subrasante mediante el uso de cenizas volantes de bagazo de caña de azúcar y cal en el tramo de la carretera Tingo María - Monzón en la provincia de Leoncio Prado". Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2020. http://hdl.handle.net/10757/653977.
Pełny tekst źródłaThe aim of this research work is to use agroindustry’s wastes in conjunction with traditional stabilizers, such as lime, to solve the problem of unpaved roads with poor or inadequate subgrade according to their CBR value. The fundamental objective of this research work was to study the influence of Sugar Cane Bagasse Ash (CBCA) in conjunction with Lime to enhancement the mechanical properties of low plasticity clay soils, according to AASHTO a A-6 (8) sub group’s soil. Likewise, some tests that were carried out in the research were the AASHTO standard compaction tests and CBR, to compare the natural soil sample and the global combinations 5%, 15% and 25% of Stabilizing Material applied to the natural soil, containing each of these the next four proportions (100% CBCA, 75% CBCA and 25% Cal, 50% CBCA and 50% Cal, 100% Cal). Among the most noteworthy results were soil improvements in compaction and CBR characteristics, reducing the incidence of Lime by 50%. The proportion of stabilizing material that presents the immediate and efficient enhancement is obtained with 5% Stabilizing Material, respect to the clay’s dry mass; with a partial combination of 50% of Lime and 50% of CBCA, increasing the CBR by 110.81% with respect to the natural soil’s CBR.
Tesis
Strydom, Jessica. "Étude de la production d’eau douce à partir de formations argileuses dans les zones de foothills". Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0114.
Pełny tekst źródłaWith progressive compaction of the sediments, mineral and organic matter transformation are known to produce water that is less saline than the original pore water, which would have been similar in composition to ocean water. This freshening has been linked to over pressure generation as a consequence of the material transformation. The aim of our experimental investigation/work was to simulate the diagenetic processes of fluid and heat flow, and mechanical compaction that are involved in the freshening of formation water from a saturated clay sample. Our objective was to use the general water chemistry, as well as Cloride and Bromide isotopic tracers, to track the evolution of freshwater production with time.The large-scale oedometric compression cell that was developed for the purpose of this study is novel and rare due to the high fluid pressures, mechanical stresses and temperatures that could be applied on the clay samples during the experiments, and the multi-disciplinary collaboration between well-reputed laboratories in order to contribute to a functional understanding of Cl and Br behaviour in geological processes. There are no similar multi-disciplinary large-scale experiments in the literature.We did three compaction experiments that lasted up to around 200 days each during which we continuously recorded axial stress, pore fluid pressure, axial deformation, and the volumes of fluids in injection and collector pumps. The experiments constituted first saturating the clay with ocean water in the large oedomertic cell, and then compacting it in either 5 or 10 steps of increasing vertical stress and temperature up to 150 MPa and 150°C, while maintaining the pore fluid pressure as close as possible to 45 MPa. Continuously following the axial deformation, and monitoring the composition of the input and expelled water allowed for a water and chemical mass balance of the system. We could therefore calculate what the remaining pore water composition should be, with each consecutive compaction step. Furthermore, the state of the art modelling software, SURP, developed by the BRGM, helped us to understand what proportion of that expelled water, was the result of clay mineral dehydration. True mineral transformation was not observed. Neither through the modelling exercise, nor through XRD mineral characterization.We found that the chemistry and isotope behavior is considerably different between swelling clay (MX80 containing 75 wt% smectite) and non-swelling clay (Sainte Suzanne marl containing 61 wt% illite & 7 wt% kaolinite). In our study we observed a general decrease of the cation and anion concentrations in the expelled water for swelling clay while its concentration slightly increased in the remaining pore fluid. This was not the case for non-swelling clay. Then, more freshening of the expelled water occurred during the compaction MX80 experiment at higher temperature.We also observed that as Br is much more effectively filtered by the clays than chlorine due to its much lower natural occurrence, this translates to a larger range of isotopic fractionation for Br (δ81Br value of the expelled water from 0.9 ‰ up to 1.5‰) than for Cl (δ37Cl value of the expelled water from -0.1‰ down to -0.5‰), in all three compaction experiments.It is supposed that significant retention of Cl and Br in the pore water of the compacted MX80 is indicative of ultrafiltration and that the surface chemistry of the clay in combination with decreasing porosity result in re-equilibration of compressed and overlapping diffuse double layers which in part, drive the anion and isotope evolution. δ37Cl and δ81Br are promising tracers to better interpret the origin and evolution of formation waters in sedimentary basins
Zhu, Xiujuan. "Unified constitutive parameters for statically compacted clay /". View abstract or full-text, 2008. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202008%20ZHU.
Pełny tekst źródłaNunes, Márcio Renato. "Estrutura de solos altamente intemperizados cultivados sob sistema de plantio direto". Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/11/11140/tde-25072018-174830/.
Pełny tekst źródłaThe economic development of Brazil depends upon the increasing agricultural production associated with conservation practices. The no-tillage system is the soil management practice that brings together the broadest set of principles for conservation agriculture. Areas under no-till system, however, generally have two completely different soils layers: a surface layer, around 0 to 7 cm, with physical and chemical conditions favorable for root development; and a sub-surface layer, around 7 to 20 cm, with lower permeability to air and water, high soil penetration resistance, and low soil fertility. The existence of these stratified layers dramatically restricts the development of the root system into the sub-surface soil layer, which may result in reducing plant productivity by water deficit. This problem exists on more than 30 million hectares cultivated under no-tillage system in Brazil, and can compromise the optimistic projections of agricultural growth in the country. Therefore, more research is necessary to explore challenges that come with no-tillage. The aim of this thesis was to study the factors that can promote the physical and chemical stratification of highly weathered soils cultivated under no-till system. Among the factors that could cause this degradation, the following were studied: i) the application of excessive lime only on surface soil, or into the uppermost soil layer, which can increase its pH to levels beyond of the zero point of charge of soil, raising its electronegative potential and promoting, as a consequence, the clay dispersion; ii) the dispersed clay migration thtough the soil profile, by the percolation water, as a factor of physical degradation of sub-surface of soil cultiveted under no-tillage; and iii) the aplication of phytomass to the soil in insufficient amount and quality to maintain the soil structural stability of the soil. The results of this study showed that lime movement into the deeper soil profile, is very slow, as its impacts are limited to just a few centimeters below of where it is applied or incorporated (2.5 cm after 130 weeks), independent of the applied amount of lime. Thus, the surface lime application intensifies the chemical stratification of the clayey soils under no-tillage, increasing to much the soil pH of the uppermost soil layer, and being inefficient to decrease the soil acidity in the subsurface soil layer. The concentration of lime into the uppermost soil layer can significantly increase the electronegativity of the soil system and result in clay dispersion in the topsoil layer (0 to 5 cm). The resulting clay migration into the soil profile led to a series of structural alterations in subsurface layers, including: decrease of both soil porosity and pore continuity; and increase of both soil bulk density and soil penetration resistance in the sub-superficial layer. The structural stability decreasing of Oxisols under no-till system also is linked with the low addition of organic matter to the cultivated soil, in relation to the non-cultivated soils. The kaolinitic Oxisols are more susceptible to degradation than the gibbsitic Oxisols. Thus, it could be conclude that liming practices (rate and application methods of lime), mainly under no-till systems, need to consider both type and mineralogy of soil, as well as considering soil structure degradation promoted by over-liming in the uppermost soil layer.
Kim, Huntae. "Anisotropic properties of compacted silty clay". Ohio : Ohio University, 1996. http://www.ohiolink.edu/etd/view.cgi?ohiou1178305587.
Pełny tekst źródłaVerzegnassi, Emerson 1968. "Estudo das propriedades no estado fresco e endurecido do concreto leve autoadensável". [s.n.], 2015. http://repositorio.unicamp.br/jspui/handle/REPOSIP/267741.
Pełny tekst źródłaDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Tecnologia
Made available in DSpace on 2018-08-28T13:32:52Z (GMT). No. of bitstreams: 1 Verzegnassi_Emerson_M.pdf: 3873734 bytes, checksum: 73682762affd1136f183e9120a07a536 (MD5) Previous issue date: 2015
Resumo: Com a descoberta de aditivos químicos e adições minerais muitos tipos diferentes de concreto surgiram ao longo das últimas décadas. Porém o peso próprio do concreto convencional é considerado a sua maior desvantagem. Com isso abre-se campo para um material que apesar de ser conhecido pelos romanos, era pouco utilizado, o concreto com agregados leves. Muitas pesquisas surgem e em aproximadamente duas décadas aparece o concreto autoadensável e mais recentemente o concreto leve autoadensável. Este trabalho propõe o estudo deste material ainda pouco explorado o concreto leve autoadensável. Para isso são produzidos concretos com argila expandida em duas granulometrias diferentes: uma graúda em substituição total ao agregado graúdo de massa normal e uma miúda em substituição parcial ao agregado miúdo. São elaboradas três famílias de traços de concreto com consumos diferentes de cimento, 320, 360 e 440 kg/m³ de concreto, e realizados ensaios no estado fresco (anel J, funil V e caixa L) e endurecido (resistências à compressão e à tração, determinação do módulo de elasticidade, absorção e densidade). Os concretos leves foram classificados como auto adensáveis e apresentaram bons resultados quanto ao fator de eficiência e resistência sendo possível estabelecer equações de correlação para seu módulo de elasticidade. Para os ensaios de densidade observaram-se concretos leves com massas mínimas de até 1550 kg/m³ e resistências à compressão superiores aos valores estipulados pela norma NBR NM 35 para as densidades apresentadas em todas as misturas
Abstract: With the discovery of admixtures and mineral additions many different types of concrete emerged over the last decades. But the own weight of conventional concrete is considered their biggest disadvantage. With this opens up the field for a material that despite being known to the Romans, it was little used, the concrete with lightweight aggregates. Much research and come in about two decades appears the self compacting concrete and more recently the lightweight concrete self compacting. This work proposes the study of this material still little explored concrete lightweight self compacting. For this are produced concrete with expanded clay in two different particle sizes: one coarse in total replacement of coarse aggregate of normal mass and a fine partially substituting fine aggregate. Are designed three families of concrete mixtures with different cement consumption, 320, 360 and 440 kg / m³ of concrete, and the tests carried out in the fresh state (ring J, V funnel and L box) and hardened (resistance to compression and traction , determining the modulus of elasticity, absorption, and density). The concretes were classified as self compacting and showed good results as to efficiency and resistance factor being possible to establish a correlation equations for its modulus of elasticity. For the density tests were observed concretes with minimum masses of up to 1550 kg / m³ and compressive strengths greater than those stipulated by NBR NM 35 standard for the densities presented in all mixtures
Mestrado
Tecnologia e Inovação
Mestre em Tecnologia
Assunção, José Wilson. "Concreto Leve Autoadensável: avaliação da influência da argila expandida no processo de dosagem e nas propriedades do concreto". Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/102/102131/tde-01072016-115653/.
Pełny tekst źródłaThis thesis discusses aspects related to the influence of lightweight aggregate in the mix design, physical and mechanical properties of the self-compacting concrete (SCC) when replacing part of the absolute volume of basalt crushed stone (máx19 mm) with a lightweight aggregate equivalent absolute volume Brazilian expanded clay (máx 12,7 mm). Understanding interference on the rheology of the SCC caused by the use of aggregates with different physical properties and recommend this type of concrete as a promising alternative for the pre-fabricated concrete industry, justify this research. The replacement of basalt crushed stone for lightweight aggregate (AE-1506), in equivalent absolute volume, was 20%, 40%, 60%, 80% and 100%. As a result, self-compacting concrete was produced with consumption of binders (cement Portland CP V-ARI and silica fume) of about 510 kg / m³, appropriate for self- compactibility limits established by the ABNT NBR 15823-1 (2010) standard. In the hardened condition, the dry density value ranged from 2.358,3 to 1.720,7 kg/m³, compressive strength (fc28) ranged from 60 to 43 MPa, elasticity modulus (Esc) ranged from 23 to 34 GPa, and efficiency structural (FES) ranged from 22 to 29 MPa.dm³.kg-1, with no visible signs of carbonation. The self-compacting lightweight expanded clay concrete (SCLC) was obtained from mixtures which its absolute volume fraction of aggregate coarse was composed by 60% of expanded clay and 40% of basalt crushed stone, with dry density of 1986 kg/m³, compressive strength (fc28) of 51.3 MPa and thermal conductivity () varied from 1,07 to 1,53 W/m.K. It was found that the expanded clay significantly interferes in the properties of concretes demanding in comparison with SCC made with 100% basalt crushed stone, mortar content and ratio higher volume of water/volume of higher fines.
Spohr, Renato Beppler. "INFLUÊNCIA DAS CARACTERÍSTICAS FÍSICAS DO SOLO NAS PERDAS DE ÁGUA POR ESCOAMENTO SUPERFICIAL NO SUL DO BRASIL E URUGUAI". Universidade Federal de Santa Maria, 2007. http://repositorio.ufsm.br/handle/1/3562.
Pełny tekst źródłaThe objective of this work was to modeling runoff in soils with different physical characteristics, with three simulated rainfall intensities (30, 60 and 120 mm h-1) in Rio Grande do Sul and Uruguay. For simulated rainfall was used a portable rainfall simulator of multiple nozzles. Six plots were delimited by metal sheet borders (0,5 m2), with a runoff collector in the lower part. The runoff was determinate each five minutes. On each soil was determinate initial time and rate of runoff, rainfall (total, time and intensities), direction of slope, crop residue and cover percentage, soil densities (bulk and particle), soil porosity (bulk, macro and micro), textural fractions (clay, silt and sand), initial and saturated soil moisture. The runoff was estimated with Smith s modified model. The model parameters were adjusted by multivariate equations. The runoff losses accumulated in Uruguay was 64, 32, 30 e 15% from total rain, for Vertissolo 1, Chernossolo, Argissolo 2 e Vertissolo 2, respectively. The runoff losses accumulated in Rio Grande do Sul was 67, 45 and 27% from total rain, for Argissolo 1, Neossolo e Latossolo, respectively. In most of the cases, the initial runoff time decreased with increasing soil moisture and rain intensity, independently of the soil surface conditions. Smith s modified model estimated better the runoff with high soil moisture. The model adjustment was satisfactory for Rio Grande do Sul.
Com o objetivo principal de modelar o escoamento superficial para solos com diferentes características físicas a partir de diferentes intensidades de precipitação e duração das chuvas, realizaram-se chuvas simuladas em diferentes solos no Rio Grande do Sul e Uruguai, com intensidade de 30, 60 e 120 mm h-1. As chuvas artificiais foram aplicadas utilizando-se um simulador estacionário de bicos múltiplos e oscilantes. Seis parcelas foram delimitadas por chapas metálicas galvanizadas cravadas no solo (0,5m2), contendo na parte inferior uma calha coletora, para coletar a água do escoamento superficial (mensurado em intervalos de cinco minutos). Em cada solo foi determinado o tempo de início e a taxa de escoamento superficial, além da chuva (quantidade, duração e intensidade), declividade do terreno, massa seca na superfície e cobertura do solo, densidade (do solo e de partícula), porosidade do solo (macro, micro e total), textura (argila, silte e areia), umidade inicial e de saturação do solo. Utilizou-se o modelo modificado de Smith para estimativa do escoamento superficial. Os parâmetros do modelo foram ajustados através de equações multivariadas. No Uruguai, as perdas acumuladas por escoamento superficial foram de 64, 32, 30 e 15% do total aplicado, para o Vertissolo 1, Chernossolo, Argissolo 2 e Vertissolo 2, respectivamente. No Rio Grande do Sul, as perdas acumuladas por escoamento superficial foram de 67, 45 e 27% do total aplicado, para o Argissolo 1, Neossolo e Latossolo, respectivamente. Na maioria dos casos houve uma redução no tempo de início de escoamento superficial, com o aumento da umidade inicial do solo e da intensidade da chuva, independentemente das condições da superfície do solo. O modelo modificado de Smith estima melhor o escoamento superficial em condições de elevada umidade do solo e o ajuste foi satisfatório para o Rio Grande do Sul.
Chlachula, Jakub. "Vývoj nové technologie ztekucení a stabilizace zemin". Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-371972.
Pełny tekst źródłaBorja, Edilberto Vitorino de. "Efeito da adi??o de argila expandida e adi??es minerais na formula??o de concretos estruturais leves autoadens?veis". Universidade Federal do Rio Grande do Norte, 2011. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15567.
Pełny tekst źródłaThe search for alternative materials with lower density, reduction in heat transfer and propagation of noise associated with the ease of handling and application in concrete structures, represents an enormous challenge in the formulation and knowledge of the performance of self-compacting lightweight concrete, which has technology little known nationally, and appears on the international scene as an innovative material and alternative to conventional concrete. Based on these, this study set out to study self-compacting lightweight concrete made with two distinct grades of expanded clay associated with the addition of plasticizing/superplasticizers additives and mineral additions of metakaolin and bagasse ash of sugar cane. There is also an object of study, evaluation of pozzolanic activity of mineral admixtures and their influence on the durability characteristics of concrete. The rheological, physical, mechanical and microstructural analysis in this study served as basis in the classification of concretes autoadens?veis, targeting the national technical requirements for their classification in the category autoadens?vel and lightweight structural. The inclusion of mineral admixtures (metakaolin and bagasse ash of sugar cane), partial replacement of cement, pozzolanic activity and demonstrated maintenance of mechanical properties through the filler effect, a reduction of up to 76% of the nitrogen gas permeability in blend with 20% bagasse ash. All concretes had rheology (cohesion and consistency) suitable for self-adensability as well as strength and density inherent structural lightweight concrete without presenting phenomena of segregation and exudation
A busca por materiais alternativos de menor massa espec?fica, redu??o na transfer?ncia de calor e propaga??o do barulho, associado ? facilidade de manuseio e aplica??o em estruturas de concreto armado, representa grande desafio na formula??o e conhecimento do desempenho de concretos estruturais leves autoadens?veis, que tem tecnologia pouco difundida em n?vel nacional, e surge no cen?rio internacional como um material inovador e alternativo ao concreto convencional. Frente ao exposto, este trabalho se prop?s a estudar concretos estruturais leves autoadens?veis elaborados com duas gradua??es distintas de argila expandida associados ? inclus?o de aditivos plastificantes/superplastificantes e adi??es minerais de metacaulim e cinza de biomassa de cana-de-a??car. Tem-se ainda como objeto do estudo, a avalia??o da atividade pozol?nica das adi??es minerais e sua influ?ncia nas caracter?sticas de durabilidade dos concretos. As propriedades reol?gicas, f?sicas, mec?nicas e microestruturais, analisadas neste estudo, serviram como fundamenta??o na qualifica??o dos concretos leves autoadens?veis, visando ?s exig?ncias t?cnicas nacionais para sua classifica??o no quesito autoadens?vel e estrutural leve. A inclus?o das adi??es minerais (metacaulim e cinza de biomassa de cana-de-a??car), em substitui??o parcial do cimento, demonstrou atividade pozol?nica e manuten??o das propriedades mec?nicas atrav?s do efeito filler, apresentando redu??o de at? 76% da permeabilidade a g?s nitrog?nio na mistura com 20% de cinza de biomassa. Todos os concretos dosados apresentaram reologia (coes?o e consist?ncia) adequada para autoadensabilidade, bem como resist?ncia e massa espec?fica inerentes aos concretos estruturais leves, sem apresentar fen?menos de segrega??o e exsuda??o
謝素蘭. "Cement-clay-fly ash based segment by compaction and sintering technology". Thesis, 1990. http://ndltd.ncl.edu.tw/handle/54488523373288880451.
Pełny tekst źródłaЛитвиненко, Тетяна Василівна. "The compaction of road embankment soils by ensuring their long-term strength". Thesis, 2016. http://er.nau.edu.ua/handle/NAU/22764.
Pełny tekst źródłaWen-Loung, Chen, i 陳文龍. "Compaction grouting induced strength increase and surface heave/resettlement in soft clay". Thesis, 1998. http://ndltd.ncl.edu.tw/handle/54360419219648238166.
Pełny tekst źródła國立臺灣科技大學
營建工程技術學系
86
A full scale field test and a 2-D laboratory model test were adopted to study the compaction grouting induced soil and strength increase for soil around the grout bulb and the ground surface heave - resettlement. A predictive model for evaluating the compaction grouting induced soil strength improvement is proposed based on the test laboratory results. The full scale test indicates that the amount of surface heave is related to the radius of grout bulb (r) and the distance from the injecting point(h). For h = 6.5 r to 20 r, the ground heaves is not much affected by the increase in grout volume nor by the distance from the injecting point. In comparison, for h < 6.5 r, the surface heave becomes larger and the amount of heave increases more significantly as it gets closer to the injection point. When the excess pore-water pressure dissipates, about 1/4 to 1/5 of the ground heave will settle back in a time period of 40 days. The laboratory model test indicates that degree of strength improvement tends to decrease with the distance from the injection point. At a distance more than five to six times the grout bulb diameter, no obvious increase in soil strength was observed. The softer clay, the higher degree of strength improvement can be achieved. The predictive model show that the soil strength improved around the compaction grout bulb increases with the decreasing distance, the increasing void ratio, the decreasing compression index, as well as the decreasing material parameter. The amount of strength increase can be satisfactorily predicted by the proposed model.
Wan, Alan Wing-Lon. "Compaction and strength characteristics of sand-clay buffer material formed at swelling pressure-water content equilibrium". 1987. http://hdl.handle.net/1993/9523.
Pełny tekst źródłaKUMAR, PARVEEN. "INFLUENCE OF DEGREE OF COMPACTION AND SURCHARGE ON CBR VALUE OF GEOGRID REINFORCED CLAY AND SANDY SOILS". Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/15152.
Pełny tekst źródłaFitzmaurice, John L. "The effect of tillage practices and soil compaction on the physical properties and productivity of a clay soil". 1997. http://hdl.handle.net/1993/12268.
Pełny tekst źródłaAli, Hatim, i Mostafa H. A. Mohamed. "The effects of compaction delay and environmental temperature on the Mechanical and Hydraulic properties of lime-stabilized extremely high plastic clays". 2017. http://hdl.handle.net/10454/13384.
Pełny tekst źródłaA comprehensive experimental programme was performed with the focus on assessing the effects of compaction delay and ambient temperature on the physical, mechanical and hydraulic properties of lime treated expansive clays. Specimens were mellowed for a period of 0, 3, 6, 12, 24 and 48 h at two different temperatures of 20°C and 40°C prior to being compacted, tested and/or cured for up to 28 days for evaluating the impacts on long-term strength development. All specimens were prepared with the same dry unit weight of 12.16 kN/m3 and moisture content of 40% except for tests aimed at determining dry unit weight as a function of mellowing period. The results revealed that as the mellowing duration increased the dry unit weight declined remarkably at both temperature within the first 12 h. In addition, higher reduction rate was observed when specimens were mel-lowed at a temperature of 40°C. A 97% reduction in swelling pressure was obtained when the specimens were compacted upon mixing (zero hour mellowing period) and left to cure for 24 h prior to testing. Permeability coefficient of lime treated expansive clays was increased by up to 40 times when compaction was delayed for 24 h or when specimens were mellowed at 40°C. Specimens mellowed at a temperature of 40°C showed rela-tively stable values of permeability coefficient over the measurement period which could be attributable to accelerated pozzolanic reaction. The Unconfined Compressive Strength tests revealed that strength of lime treated expansive clays is significantly affected by compaction delay. An increase of 234% and 282% in the Unconfined Compressive Strength was achieved after 24 h of mixing with no compaction delay at 20°C and 40°C respectively. Gradual long-term gain in strength was observable within the 28 days post mixing but the rate of strength gain becomes slower and independent of temperature after the first 24 h of mixing. The results sug-gested that the four key reaction mechanisms occur concurrently with the first 12–24 h after lime addition recognized as being the most crucial period of time. Damaging the cementitious compounds by delayed com-paction is harmful to strength and restraining of swelling potential of lime treated expansive clays.
Makowitz, Astrid. "The genetic association between brittle deformation and quartz cementation : examples from burial compaction and cataclasis /". Thesis, 2004. http://wwwlib.umi.com/cr/utexas/fullcit?p3127091.
Pełny tekst źródłaPereira, Ana Isabel Baptista. "Influência da técnica da elaboração de provetes laboratoriais na quantificação da deformabilidade e resistência mecânica dos solos". Master's thesis, 2015. http://hdl.handle.net/1822/40624.
Pełny tekst źródłaDe modo a acompanhar as exigências associadas aos projetos de engenharia há uma crescente necessidade de melhorar as características dos solos pois, por vezes, estes na sua forma natural não contêm características satisfatórias para a utilização na construção civil. A reconstituição de provetes em laboratório permite estudar as características dos solos, quer a nível de resistência mecânica e deformabilidade, de forma a promover um conhecimento mais alargado sobre o comportamento dos mesmos quando sujeitos a projetos de Engenharia. A compactação dos solos é o processo utilizado para conferir ao solo, que se encontra na forma natural, melhor características estruturais, ou seja, menor deformabilidade e maior resistência mecânica. O processo de compactação pode ser realizado de diversas formas, sendo que estas podem ou não produzir características estruturais distintas. Neste caso de estudo, o objetivo é perceber a influência da técnica de elaboração de provetes laboratoriais na quantificação da resistência mecânica e deformabilidade do solo. Assim, foram selecionados dois tipos de solo, nomeadamente, um solo residual granítico (incoerente) e uma argila (coerente). Estes dois solos foram compactados por quatro técnicas de compactação distintas: compactação Proctor, compactação com o martelo vibratório, compactação manual e compactação Harvard. Foram realizadas amostras compactadas pelas diferentes técnicas de compactação em estudo, para ensaio na caixa de corte direto e edómetro. Estes dois ensaios permitiram perceber o objetivo deste caso de estudo. Este conhecimento é de extrema importância pois permite verificar qual a sensibilidade dos solos á técnica de compactação aplicada, o que poderá decidir uma atitude diferente enquanto engenheiros civis.
In order to face the demands related to engineering projects, there is an increasing need to improve soil composition since it is usually not appropriate for civil construction in its natural state. Laboratory reconstituted samples make the study of soil features possible both in terms of mechanical resistance and deformation, promoting a deeper knowledge concerning its behavior when used for engineering projects. Soil compaction is the process used to provide natural soil with better structural features. This means less deformation and greater mechanical resistance. The compaction process can be performed in different ways, however these can either produce distinct structural characteristics or not. In this case study, the objective is to understand the influence of the technique used to prepare laboratory samples on the quantification of mechanical resistance and deformation of the soil. Therefore, two types of soil have been selected, namely, residual granite soil (non coherent) and a clay (coherent). These two types of soil have been compacted using four compaction methods: Proctor compaction, vibrating hammer compaction, manual compaction and Harvard compaction. Samples have been made using these different techniques for direct shear box and oedometer testing. These two tests clarified the objective of this case study. This knowledge is paramount in verifying the sensitivity of the soil regarding the compaction method applied, and this can influence the behavior of civil engineers.
Walker, Trevor Meade. "Quantifying using centrifuge of variables governing the swelling of clays". Thesis, 2012. http://hdl.handle.net/2152/ETD-UT-2012-08-5925.
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