BEARING CAPACITY OF CIRCULAR FOUNDATIONS ON SOFT CLAY OF STRENGTH INCREASING WITH DEPTH
BEARING CAPACITY OF CIRCULAR FOUNDATIONS ON SOFT CLAY OF STRENGTH INCREASING WITH DEPTH
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DOI：
10.3208/sandf.35.4_21
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发表时间：
1995-12
影响因子：
3.7
通讯作者：
K. Tani;W. Craig
中科院分区：
文献类型：
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作者：
K. Tani;W. Craig
深海石油平台等大型海洋重力式结构物的基础下通常设有裙板系统。当这种带有深裙板的大尺寸基础放置在软粘土沉积物上时，在承载力计算中考虑非均匀强度分布的影响变得非常重要。在这项研究中，塑性理论被用来评估线性增加的不排水抗剪强度与深度的浅基础的承载力的影响，在平面应变和轴对称条件下。在此基础上，提出了一种简单的承载力计算方法，即在传统的承载力理论框架中引入强度一致性增长的影响。对粘土地基上的圆形模型进行了一系列离心试验。在有限的测试用例下，实验结果证明了该方法的有效性。此外，在模型粘土层中观察到的破坏是由于冲切;其机制仅限于浅深度，以避免粘土剪切随深度迅速增强。
ABSTRACT Huge offshore gravity structures such as deep-sea oil platforms are often equipped with a skirt system underneath their bases. When such foundations of substantial size with deep skirts are to be placed on soft clay deposits, it becomes important to take account of the influence of a non-homogeneous strength profile in bearing capacity calculations. In this study, plasticity theory was used to evaluate the influence of linearly increasing undrained shear strength with depth on the bearing capacity of shallow foundations, under both plane strain and axisymmetric conditions. Based on the results of computations, a simple method is proposed to calculate bearing capacity using a set of charts, which introduces the effect of increasing strength consistently into the framework of conventional bearing capacity theory. A series of centrifuge experiments was also conducted for circular models founded on clay beds. With a limited number of test cases, the experimental results have proved the validity of the proposed method. Furthermore, the failure observed in the model clay beds was due to punching shear; the mechanism of which was confined to shallow depths to avoid shearing of the clay quickly strengthening with depth.