端承嵌岩桩桩端阻力研究  

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

作　　者：胡德华[1] 宋靖华[2] 

机构地区：[1]武汉工程大学环境与城市建设学院,湖北武汉430074 [2]武汉大学城市设计学院,湖北武汉430073

出　　处：《武汉工程大学学报》2007年第3期35-38,共4页Journal of Wuhan Institute of Technology

摘　　要：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.The actual theory and code for design ot 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.

关 键 词：嵌岩桩 无侧限抗压强度 三向受压应力状态 桩端极限承载力 

分 类 号：TU452[建筑科学—岩土工程]