Settlement and Earth Pressure of Pre-Sheared Soils

9530464 该研究计划的目标是调查和澄清与未受扰动的地面以及经过采样、现场测试、地震震动或施工作业（包括地面改造）的粘土和粒状土壤中的地静应力条件有关的基本问题。有效水平压力对粒状土的抗沉降和液化作用有显着影响。以及地面改造前后现场测试的地面响应。 为研究而制定的具体问题包括预剪对横向约束水平地面条件下水平压力的永久影响，以及循环预剪作用下干净粒状土壤的沉降。研究方法依赖于严格的实验技术和长期的实验室和现场观察，以及数学建模和数值分析。 实验室研究中使用了高质量的原状天然粘土样品以及天然砂矿床的重构样品。 ***

9530464 The objectives of this research program are to investigate and clarify fundamental questions in relation to the geostatic stress condition in undisturbed ground, as well as in clays and granular soils subjected to sampling, in situ testing, earthquake shaking, or construction operations, including ground modification. Effective horizontal pressure has a significant effect on resistance to settlement and liquefaction of granular soils. as well as on ground response to in situ tests before and after ground modification. The specific questions formulated for investigation include the permanent effect of pre-shearing on the horizontal pressure in the laterally constrained level ground condition, and settlement of clean granular soils subjected to cyclic pre-shearing. The research method relies on exacting experimental techniques and long-term laboratory and field observations, as well as mathematical modeling and numerical analysis. High quality undisturbed samples of natural clays, as well as reconstituted specimens of natural sand deposits, are used in the laboratory investigations. ***