摘要
本文根据Hoek-Diederichs公式,直观给出巷道围岩变形模量估计图表,计算出不同扰动参数D对岩体变形模量的影响。岩体开挖扰动系数D与扰动程度和扰动范围有关,提出了基于岩芯弹性模量分布的D值计算方法,以积分和距离均一化的形式给出D的量化公式。基于地质强度指数GSI、扰动系数D和Hoke-brown准则,估算深埋巷道岩体力学参数。数值计算出钻爆法施工巷道围岩的塑性区范围和位移值大小,并与现场实测值对比,塑性区相对误差低于11%,位移相对误差低于15%,该D值的估算方法有一定工程应用价值。
Based on empirical equation, visualized chart and graph was created for estimating rock mass deformation modulus,which was greatly influenced by the degree of disturbance D. the value of D is related to influence degree and range. The quantitative formulas of D value is presented in the form of integral and distance normalization for the distributions of elastic modulus of rock core. The mechanical parameters of rock masses of deep tunnel was estimated based on geological strength index GSI, degree of disturbance D and strength criterion. With FLAC3D, these parameters were adopted to judge the law of stress, displacement,and plasticity range of rockmass. The relative error of below is 11% between calculated value and experimental value of plasticity range, and, 15 % for displacement values. The comparison of calculated results with measured data verified that the quantitative method is feasible and correct in rock engineering.
出处
《中国矿业》
北大核心
2015年第10期123-127,共5页
China Mining Magazine
基金
国家自然科学基金项目"冲击荷载作用下岩石的高应变率特性研究"资助(编号:51474016)
关键词
扰动系数
变形模量
强度准则
岩体力学参数
deformation modulus
degree of disturbance
strength criterion
mechanical parametersof rock mass
