地震作用下压力型锚索孔周边岩体应力数值模拟

摘要

In order to study on the anchor mechanism of cable more precisely,the surrounding rock dynamic stress of an-chor hole under the earthquake load were studied by numerical simulation through FLAC3D software,and the effect of gradient elastic modulus,the gradient Poisson's ratio,the gradient cohesion,the gradient internal friction angle of the rock mass sur-rounding anchor hole on the compressive stress of mortar and the shear stress of the rock mass surrounding anchor hole under the earthquake load were investigated. The results showed that the gradient elastic modulus had a really significant effect on the shear stress of the rock mass surrounding anchor hole,and the gradient cohesion and the gradient internal friction angle also in-fluences the compressive stress of mortar and the shear stress of the rock mass surrounding anchor hole. The results enriched the content of anchorage type pressure mechanism under the earthquake load,which can supply reference to engineering.%为了更加精确地研究压力型锚索的锚固机理，通过FLAC3D 软件对地震作用下压力型锚索孔周边岩体的动态应力状态进行了数值模拟，研究了地震作用下锚索孔壁周边岩体梯度变化的弹性模量、梯度变化的泊松比、梯度变化的凝聚力、梯度变化的内摩擦角对砂浆受到的压应力和锚索孔周边岩体受到的剪应力的影响。研究结果表明：梯度变化的弹性模量对锚索孔周边岩体受到的剪应力的影响较大，梯度变化的凝聚力、梯度变化的内摩擦角对砂浆受到的压应力和锚索孔周边岩体受到的剪应力的影响都比较大。研究结果丰富了地震作用下压力型锚索锚固机理内容，可供工程界参考。