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Drained Bearing Response Of Shallow Foundations On Structured Soils

机译：浅层基础对结构性土壤的排水响应

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摘要

This paper examines the drained bearing response of circular footings resting on structured soil deposits. Numerical simulations have been carried out using a finite element formulation of the Structured Cam Clay model. A parametric study was conducted by varying the parameters that govern the behaviour of structured soils and guidelines are given for designers to identify when effects of the soil structure are important. Under fully drained conditions, deformation within the structured soil supporting the footing usually occurs as a local or punching shear failure due to high compressibility of the structured soil and the mobilised bearing pressure increases with the footing movement, without reaching an ultimate value. A novel approximate method is presented to obtain the load-displacement response of a rigid circular footing resting on the surface of a structured soil deposit. This requires the properties of the soil in the reconstituted state and two additional parameters, which govern the natural structure of the soil. The proposed method has been applied to a published case study, where plate load test results are given for rigid circular steel plates resting on structured soil deposits. Fair agreement is observed between the computed and experimental results, suggesting the approximate method may be useful in design studies of foundations on structured soil deposits.
机译：本文研究了搁置在结构化土壤沉积物上的圆形基础的排水支座响应。使用结构化凸轮粘土模型的有限元公式进行了数值模拟。通过改变控制结构性土壤行为的参数进行了参数研究，并为设计人员提供了确定土壤结构影响何时重要的指南。在完全排水的条件下，由于结构化土壤的高压缩性，局部支撑或冲剪剪切破坏通常会在支撑基础的结构化土壤中发生变形，并且动静的承压随基础运动而增加，而没有达到最终值。提出了一种新颖的近似方法来获得结构化土壤沉积物表面上的刚性圆形基础的荷载-位移响应。这就要求土壤处于复原状态，并且需要两个附加参数来控制土壤的自然结构。所提出的方法已应用于已发表的案例研究中，在该案例研究中给出了基于结构化土壤沉积物的刚性圆形钢板的板载荷试验结果。计算结果与实验结果之间存在合理的一致性，这表明近似方法可能对结构化土壤沉积物地基的设计研究有用。

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