基于Hoek-Brown强度准则的锚杆支护效应研究

Study on Bolt Support Effect Based on Hoek Brown Strength Criterion

基于围岩增强理论原理,通过数值模拟对锚杆支护效应的量化问题进行了研究分析,建立锚杆密度与GSI之间的等效换算关系,从而对锚杆的支护效应进行量化,并得到以下结论:①锚杆密度与GSI分数之间成线性正相关,锚杆密度越大,GSI分数越高,对围岩的提升作用越大;②在锚杆密度一定的情况下,减小锚杆的排距比减小锚杆的间距对提高围岩强度的效果更为明显;③锚杆支护对硬岩的提升作用不显著,对软岩的增加效果十分明显,岩石越软锚杆的增强作用越明显。

Based on the theory of surrounding rock reinforcement,this paper studies and analyzes the quantification of bolt support effect through numerical simulation,establishes the equivalent conversion relationship between bolt density and GSI,so as to quantify the bolt support effect,and obtains the following conclusions:①The higher the anchor density,the higher the GSI score,and the greater the lifting effect on the surrounding rock;②When the density of anchor rods is constant,reducing the row spacing of anchor rods has a more significant effect on improving the strength of surrounding rock than reducing the spacing of anchor rods;③The lifting effect of bolt support on hard rock is not significant,but the increasing effect on soft rock is very obvious.The softer the rock,the more obvious the strengthening effect of bolt.