摘要
为从理论上揭示锚杆预紧力对巷道支护效果的作用机理,针对锚杆支护岩石巷道,建立了分析巷道围岩力学特征的理想弹塑性应变软化模型,获得施加预紧力锚杆支护后巷道围岩位移、应力分布的解析表达式,从理论上表明:提高锚杆预紧力对控制巷道围岩变形及改善巷道周边围岩的应力状态有积极的作用,有利于保持巷道围岩的稳定。并结合现场实际研究了锚杆预紧力对巷道支护效果的影响关系,研究成果对分析锚固作用机理及进行锚杆支护设计具有指导意义。
In this paper, to theoretically demonstrate the action mechanism of bolt pretension on sup- porting effect of roadway, the ideal elasto-plastic strain-softening model is established to analyze the mechanical characteristics of bolt supporting in rock roadway. Thus, the analytical expressions of dis- placement, stress distribution in roadway surrounding rock after pre-stressed bolt supporting are ob- tained. The theoretical analysis results show that improving the bolt pretension can improve the stress states of surrounding rock around the roadway and control the roadway deformation effectively, which is beneficial to maintain the roadway stability. Moreover, the influence relation of bolting pretension on roadway supporting effect is further studied based on field measurements. The research results can pro- vide theoretical basis for analyzing the bolting action mechanism and bolt supporting design.
出处
《采矿与安全工程学报》
EI
北大核心
2012年第5期657-661,共5页
Journal of Mining & Safety Engineering
基金
国家自然科学基金项目(51204006)
安徽省杰出青年基金项目(1108085J02)
安徽理工大学优秀创新学术团队项目(20091801)
关键词
岩石巷道
锚杆支护
预紧力
支护效果
理论分析
rock roadway
bolts supporting： bolt pretensiom supporting effect
theoretical analysis
