黄土地区压力型锚索锚固机理数值模拟研究

Numerical Simulation Research on Anchoring Mechanism of Compression Anchors in Loess Areas

为深入探究黄土地区压力型锚索的作用机理,采用FLAC3D工程分析软件对压力型锚索在黄土地层中锚固段应力状态进行了数值模拟。首先对风化土体中压力型锚索的拉拔实验进行了FLAC3D数值模拟,并将得到的模拟结果与实验数据进行对比分析,验证了所建模型的合理性与可靠性;同时研究了模型中接触面各参数的取值规律,引入黄土地区岩土体及接触面参数,建立了黄土体中压力型锚索的FLAC3D数值模型,并施加张拉力,得到了压力型锚索模型在不同影响因素下的注浆体的轴应力、土体注浆体界面剪应力的分布,从而揭示了黄土地区压力型锚索的荷载传递机制和锚固机理。

In order to thoroughly explore the anchoring mechanism of the compression anchors in the loess area,by the use of the FLAC3 D engineering analysis software the numerical simulation was performed on the stress state of the anchorage section of the compression anchors in the loess area.Through the FLAC3 D numerical simulation on the pullout experiments of the compression anchors in the weathered soil,the comparison between the simulating results and the test data verified the dependability of the numerical model.The value of the parameters of the contact surface in the model was studied,and then the FLAC3 D numerical model of the compression anchors in the loess was established.The geotechnical parameters and contact parameters of the loess area were introduced to complete the numerical model of the compression anchors in the loess area,and the pullout load was applied.The axial stress of the grout and shear stress along the soil/grout interface were obtained under different load cases,which reveals the load transfer mechanism and anchoring mechanism of the compression anchors in the loess area.