拉格朗日差分法的预应力锚杆数值模拟与应用  

Numerical Simulation and Its Application to Prestressed Anchor Based on the Fast Lagrangian Analysis Method

作　　者：郑卫锋[1,2] 贾金青[2] 

机构地区：[1]中国电力科学研究院工程力学研究所,北京100055 [2]大连理工大学土木水利学院,辽宁大连116024

出　　处：《地下空间与工程学报》2009年第6期1293-1297,共5页Chinese Journal of Underground Space and Engineering

摘　　要：深基坑预应力锚杆的极限拉拔承载力的确定是预应力锚杆设计成功与否的关键因素之一。运用快速拉格朗日差分法模拟深基坑中单根预应力锚杆的加固作用机理,分析各个参数对锚杆拉拔力的影响。数值模拟结果表明,随着注浆压力的增加,锚杆的极限承载力相应增大;锚杆的极限承载力随着锚杆锚固段长度的增加呈非线性增长。以实际工程为例对不同岩性的锚杆拉拔试验进行分析,数值模拟结果与现场试验数据吻合较好,为深基坑工程中预应力锚杆的数值模拟计算参数的选取和锚杆设计应用提供参考依据。The evaluation of the ultimate tensile capacity is one of the most important factors for prestressed anchor in deep foundation pit. Based on the Fast Lagrangian Analysis Method, the reinforcement mechanism of single prestressed anchor is simulated, and the influencing parameters to ultimate tensile capacity are analyzed. With the increase of the grouting pressure and the bonded section length, the ultimate tensile capacity is increased, but the capacity is nonlinearly increased with the bonded section length. An instance of prestressed anchor pull - resisting test in field on different rocks is analyzed and the numerical simulation fits well with the test result. The conclusions can be referenced for choosing computing parameters in the numerical simulation of prestressed anchor and prestressed anchor design in deep foundation pit.

关 键 词：深基坑 预应力锚杆 锚固段 极限拉拔承载力 数值模拟 

分 类 号：TU45[建筑科学—岩土工程]