缩径对钻孔桩极限承载力特性的影响分析

Influnce Analysis of the Necking on Bored Pile's Ultimate Bearing Capacity

缩径是钻孔灌注桩施工中经常遇到的工程问题之一,对桩基承载力有很大的影响。在缩径成因分析的基础上,通过AN-SYS有限元仿真模拟,分析了不同缩径条件下桩基极限承载力的变化情况。基于仿真分析成果,利用回归分析,提出了不同缩径条件下桩基极限承载力的理论计算公式,并验证了其可靠性。研究成果可供理论研究、桥梁桩基础设计和施工参考。

Necking is one of the frequently encountered engineering problems in the construction of bored piles and has a great im- pact on the Bearing capacity of the pile. Based on the analysis of the basis cause of the necking, through the ANSYS finite element simulation, The changes of the ultimate bearing capacity of pile foundation under the different necking conditions is studied. Based on the simulation results, the theoretical formula of ultimate bearing capacity of pile foundation under the different necking condi- tions is determined by using EXCEL regression analysis and its reliability is verified. The results can be used for reference in theoretical research, bridge pile foundation design and construction.