Settlement and Earth Pressure of Pre-Sheared Soils

9530464本研究计划的目的是调查和澄清与原状地面以及在取样、现场测试、地震震动或施工作业(包括地面修改)中进行取样、现场测试、地震震动或施工作业的粘土和散粒土中的地应力条件有关的基本问题。有效水平压力对散体土的抗沉降性和抗液化能力有显著影响。以及地面改性前后现场试验的地面响应。具体的研究问题包括横向约束水平地基条件下预剪对水平压力的永久影响，以及清洁散粒土在循环预剪作用下的沉降。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测，以及数学建模和数值分析。在实验室研究中使用了高质量的天然粘土原状样品以及天然砂质沉积物的重塑样品。***

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. ***