端承嵌岩桩桩端阻力研究

现行嵌岩桩设计规范与理论只考虑桩端岩石的单向受力状态，而实际上桩端岩石在竖向荷载作用下，由于压缩变形受到周边岩石横向约束的作用而处于三维受压状态，其三轴应力强度远高于单轴强度．因此目前设计计算理论不能客观反映桩端岩石应力状态，明显偏于保守．嵌岩桩静载荷试验调查结果也证实了这一点．为此，应用材料力学强度理论对嵌岩桩的承载力进行了深入的分析研究，提出了嵌岩桩承载力的合理计算方法．

A study on end bearing rock-socketed pile-tip resistance

The actual theory and code for design of rock-socketed pile considered that the rock is only in one-dimensional stress state.In fact it is in three-dimensional due to compression deformation in the collar under the act of the vertical load.The triaxial stress strength is more powerful than one-dimensional's.So the external rock stress state is not reflected in active design-count theory,and it is too conservative obviously.The static loading test result also approved it.Therefore the bearing capacity of rock-socketed pile is studied in-depth with the strength theory on mechanics of materials.A reasonable calculation method on bearing capacity rock-socketed pile is put forward.