组合桶形基础水平循环承载力模型试验

在一个大型土池中进行了软土中组合四桶基础在竖向静荷载与水平循环荷载共同作用下的承载力模型试验,研究了竖向静荷载与水平循环荷载对组合桶形基础破坏形式与承载力的影响。试验结果表明,组合四桶基础的变形主要包括水平循环变形与竖向循环累积沉降。基础的破坏形式取决于水平循环荷载与竖向静荷载。若竖向静荷载较小,过大的水平循环位移将导致基础破坏;随竖向静荷载增加,竖向循环累积沉降将变为导致基础破坏的主要原因。试验结果还表明,在不同竖向静荷载与水平循环荷载共同作用下,基础的水平循环承载力大约为水平静承载力的70%左右。

Model tests on bearing capacities of combined bucket foundations under lateral cyclic loads

Model tests were conducted in a large model test tank to study bearing capacities of 4-bucket foundation in the soft clay under combined vertical static loads and lateral cyclic loads. Effects of vertical and lateral cyclic loads on failure modes and bearing capacities of the combined bucket foundation were analyzed. Test results show that deformation of the combined bucket foundation includes lateral cyclic deformation and vertical cyclic accumulative settlement and that the failure mode of the foundation depends on the lateral cyclic and vertical static loads. If the vertical static load is smaller, the failure of the foundation results from the large lateral cyclic deformation. The main reason resulting in failure of the foundation is the vertical cyclic accumulative settlements with the increaseof the vertical static load. Test results also show that the lateral cyclic bearing capacity of the foundation is about 70% of the lateral static bearing capacity for different combinations of vertical static and lateral cyclic loads.