论文部分内容阅读
研究了锚杆长度及初锚力在煤矿巷道二次支护中所起作用。以有限元程序ABAQUS为分析工具,以锚杆长度及初锚力为变化参数,建立了18个计算工况,定性研究了各参数在煤矿巷道二次支护中所起的作用,并用煤矿巷道现场实验进行了验证。研究表明,巷道二次支护相对于一次完成全部支护,能降低巷道围岩环向拉应力,降低围岩开裂趋势;增大锚杆长度及增大初锚力对二次支护锚固效果有增强作用,从性价比角度考虑,增大初锚力比增大锚杆长度对增强锚固效果更有效。
Studied the role of anchor length and initial anchor force in secondary support of mine roadway. Taking the finite element program ABAQUS as the analysis tool and the parameters of bolt length and initial anchor force as the changing parameters, 18 calculation conditions were established, and the role of each parameter in the secondary support of mine roadway was studied qualitatively. Field experiments were validated. The research shows that the secondary support of the roadway can reduce the circumferential tensile stress of the surrounding rock and reduce the cracking tendency of the surrounding rock in comparison with the complete support at one time. The anchorage effect of the secondary support There is enhanced role, from the cost point of view, increasing the initial anchor than the anchor to increase the length of the anchor to enhance the effectiveness of more effective.