刚性桩横向承载力的三维极限分析

根据试验中观察到的土体破坏模式，建立了相应的破坏机构，用上限法对c-φ土中刚性桩的横向承载力进行了三维极限分析。将破坏土体分为3个塑性变形区，假设了满足运动边界条件的合理速度场，建立了求解光滑刚性桩横向承载力上限解的数学模型。通过极限分析发现光滑刚性桩承载力的上限解与差分解相差不大，并利用由有限差分法得到的规律对光滑桩承载力的上限解进行了修正，得到了粗糙桩承载力的粗略解。三维极限分析为计算刚性桩横向承载力提供了一种简便有效的方法。

THREE-DIMENSIONAL LIMIT ANALYSIS OF LATERAL BEARING CAPACITY OF RIGID PILES

According to the failure mode of soil mass observed from tests,the corresponding failure mechanism is proposed to solve the lateral bearing capacity of rigid piles embedded in c-? soil with upper bound analysis method.The three-dimensional failure mechanism that consists of three deformation failure regions and the reasonable velocity field that meets kinematical boundary condition of each deformation failure region are assumed.The mathematical model of the upper bound solution of the lateral bearing capacity for smooth rigid piles is established and solved.It is found that the difference between the upper bound solution and the finite difference solution of the lateral bearing capacity of smooth rigid piles is little.In addition,the upper bound solution of the lateral bearing capacity of rough rigid piles is obtained by modifying that of smooth rigid piles according to the results acquired from finite difference method.The three-dimensional limit analysis provides a simple and effective computing method for the lateral bearing capacity of rigid piles.