围岩应变软化巷道锚杆支护作用的计算  

Calculation of Bolt Support in Surrounding Rock Strain Softening Roadway

作　　者：李大伟[1] 侯朝炯[2] 

机构地区：[1]河南理工大学能源科学与工程学院,河南焦作454000 [2]中国矿业大学矿业工程学院,江苏徐州221116

出　　处：《采矿与安全工程学报》2008年第1期123-126,共4页Journal of Mining & Safety Engineering

基　　金：河南省基础与前沿技术研究计划项目(072300440100)

摘　　要：从围岩应变软化巷道弹塑性力学计算出发,引入软化模量与非关联流动法则,用锚杆两端对围岩体内锚固区施加的两组夹紧力来考虑锚杆支护对巷道围岩应力状态改变的影响;在锚固围岩体力学性质的黏结力和内摩擦角不变的情况下,建立了锚杆支护对围岩稳定作用的弹塑性力学模型.通过计算,得到了不同锚杆支护强度和锚固区半径下的围岩应力、巷道位移、围岩应变软化区半径及破碎区半径的理论计算公式;分析了围岩应变软化巷道锚杆支护的应变软化区、破碎区及巷道周边位移变化趋势,并在巷道锚杆支护的参数选定中进行了应用.The softening modulus and non-associated flow rule are introduced in this paper. The support effect on rock stress changing is represented by two groups of compressive forces at the two ends of bolt in anchorage area of surrounding rock. The elastic and plastic mechanics model of bolt action is established on condition that the mechanical property, cohesive force, and internal friction angle keep unchanged. Through the calculation, the stress, roadway displacement, the radius strain softening area, and the radius of area of broken rocks are formulated for different support strengths and anchorage area radius. The changing tendency of roadway perimeter displacement, strain softening area, and broken area are analyzed. Finally, the formulation is applied in choosing bolt support parameters.

关 键 词：应变软化 巷道 锚杆支护 弹塑性力学模型 非关联流动法则 

分 类 号：TD350.1[矿业工程—矿井建设]