考虑支护作用影响的煤岩巷道变形非线性分析

根据非线性动力学理论,利用FLAC3D数值软件,建立三维计算模型,对锚网锚杆、U型钢支护和吸能支护条件下的煤岩巷道冲击变形规律进行数值模拟,再现深埋巷道变形破坏过程,研究不同支护作用对巷道变形动力响应的影响。数值计算结果说明,锚网锚杆(主动支护)对提高围岩体强度作用明显,但在冲击载荷作用下巷道围岩应力大,变形量也大,破坏程度严重;U型钢支护(被动支护)可有效提高巷道支护强度,冲击作用后同样表现出抵抗能力较差,巷道整体变形较大;吸能支护对于抗缓冲和吸收冲击能作用明显,表现为冲击应力大幅度降低,巷道变形量减小,整体稳定性显著提高。

Nonlinear Analysis on Roadway Deformation Considering Supporting Effect

According to the nonlinear dynamics theory,the three-dimensional calculation model was built by means of FLAC3D numerical software.The numerical simulation was conducted for the impact deformation law of coal petro-logy roadways under the supporting conditions of anchor net and bolts,U type steel supports and energy absorbing supports,reappearing the failure and deformation processes of deep-buried roadways and studying the influence of different supports on dynamic responding of roadway deformation.Numerical results show that the anchor net and bolts(active supports) have a significant effect on improvement of the strength of surrounding rocks,but the stress and deformation of surrounding rocks are very large and also leading serious roadway damage under impact loading.U type steel support(passive support) can effectively improve the strength of roadway supports,and also show less resistance and large overall deformation after impact loads.Energy absorbing supports have an obvious effect on anti-impact and absorption of impact energy,showing a significant reduction of impact stress and roadway deformation and greatly increasing the overall stability of the roadways.