基于Mindlin解地震作用下压力型锚索的拟静力分析

为了更加精确地研究地震作用下压力型锚索的锚固机理,基于Mindlin解推导出了圆形均布荷载作用下压力型锚索体系中注浆体受到的压应力表达式和注浆体与锚索孔壁之间的剪应力表达式,结合地震作用效应的拟静力简化方法,研究了锚索孔半径、承压板半径、岩土体的泊松比、锚索孔方向与水平线之间的夹角、预应力值大小、地震烈度等因素对压力型锚索加固效果的影响。研究结果表明:锚索孔半径、承压板半径、锚索孔方向与水平线之间的夹角、预应力值大小、地震烈度的影响结果较大,岩土体的泊松比影响结果较小。研究成果丰富了预应力锚索的抗震设计内容,可为边坡加固充分发挥压力型锚索良好的抗震性能提供参考。

Pseudo-static force analysis of pressure-type cables based on Mindlin basic solution under earthquake

In order to accurately study the anchoring mechanism of pressure type cables under earthquake more precisely,the expressions of compressive stress in anchorage section grout and the shear stress between anchorage section grout and contact surface under circular uniform load in a pressure type anchor cable system were derived based on the Mindlin solution. Applying the pseudo-static simplification method to consider the earthquake action effect,the influences of various factors on the anchoring effect of anchor cables were studied. The results show that the Influences of the anchor hole radius,bearing plate radius,angle between the anchor hole direction and horizontal line,prestress and seismic intensity are rather greater,and that of the Poissons ratios of rock and soil mass is rather smaller. The results are benefitial to the seismic design of pressure-type cables and the seismic performance design method of the slope reinforced by pressure-type cables was also provided.