Ultimate end bearing capacity of rock-socketed pile based ongeneralized nonlinear unified strength criterion

来源期刊：中南大学学报(英文版)2011年第1期

论文作者：章敏 王星华 汪优

文章页码：208 - 215

Key words：rock-socketed pile; generalized nonlinear unified strength criterion; slip line principle; embedment ratio; damage; end bearing capacity

Abstract: In order to study the mechanism of bearing behavior at the tip of a pile embedded in rock, the generalized nonlinear unified strength criterion and slip line principle for resolving the differential equation systems which govern the stress field were applied to derive the ultimate end bearing capacity based on some reasonable hypothesis and failure plane model. Both numerical simulation and test results were compared with the theoretic solution. The results show good consistency with each other and verify the validity of the present approach. The depth effect with respective to embedment ratio and other influence factors like geological strength index, intermediate principal stress, overburden factor, and damage on end bearing capacity were discussed in the analytical solution. The results show that the proposed yield criterion can be much better for investigating the ultimate end bearing performance of rock-socketed pile. The end bearing capacity increases with embedment ratio and the increasing degree is influenced intensely by the above parameters. Furthermore, ignoring intermediate stress effect would underestimate the strength properties of the rock material and lead to a very conservative estimation value.