节理边坡锚杆加固效应分析

基于强度折减的拉格朗日差分法,对某公路节理岩质边坡建立数值模型,分析对边坡稳定性构成威胁的滑动面和不稳定体,研究锚杆支护对该滑动面和不稳定体运动的控制作用。计算结果表明,在未支护前,该边坡安全系数为0.67,处于不稳定状态,边坡滑动面为两组节理结构面切割形成的贯通面。采用相间锚杆对边坡进行支护后,安全系数提高到1.29,锚杆有效地控制了滑体的滑移,增大了边坡的安全系数,提高了边坡的稳定性。

The Reinforcement Effect of Bolt in Jointed Rock Slope

By the lagrangian difference method which is based on the shear strength reduction,a numerical simulation model is founded for one jointed rock slope.The analysis is done to the slip plane and the instability body which are critical to the stability of the slope.The function of rock bolt to the slip plane and the instability is studied.The calculation shows that before reinforcement,safety factor of slope is 0.67 which shows that the slope is in instability state,the slip planes are two sets of transfixion plane in slope.Wholly grouted bolts reinforcement of long and short staggered rock bolts is chosen as the reinforcement type for slope.After reinforcement the safety factor of slope increases to 1.29.So the rock bolts control the slippage,and improve the stability of slope.