非均匀应力场下巷道围岩弹塑性分析

根据岩石材料的变形特性，引入了在实际工程中对巷道围岩具有一定影响的参数，采用岩石应力-应变三线段力学模型，分析了非均匀应力场下圆形巷道围岩弹性区、塑性软化区、塑性残余区的力学形态，推导出了非均匀应力场下圆形巷道弹塑性的理论解。在此基础上给出具体算例，分析了不同的影响因素对巷道围岩的影响。通过实例表明：岩石的侧压系数、应变软化、支护压力对围岩的力学形态、塑性区大小都有很大的影响；随着侧压系数的增加，巷道两帮处的塑性区范围在减小；软化模量的降低可以减小塑性区的半径；支护压力增加也可以减小塑性区半径。了解岩石的侧压系数，控制岩体的软化模量，适时加大支护压力均能有效地控制巷道围岩的稳定性。

Elasto-plastic analysis on surrounding rock mass under non-uniform stress field

According to the deformation characteristics of rock material，introduced some parameters which in practical projects for surrounding rock has certain influence，using rocks stress strain three lines mechanical model，mechanical behaviors of the non uniform stress field of circular tunnels elastic zone，plastic softening zone，plastic residual zone were analyzed，and the non uniform stress field of circular tunnels elasto plastic theoretical solution was deduced.Based on a concrete example gave，analyzed different affecting factors on the influence of the surrounding rock.Through examples show that the side pressure coefficient，strain softening，supporting pressure of the rock have large effect on surrounding rock mechanics behaviors and plastic zone.Along with the increase of side pressure coefficient，two sides roadway in plastic zone range decreases;softening modulus of lower can reduce the radius of plastic zone;supporting pressure increases can also reduce the plastic zone radius.Understand the rock side pressure coefficient，the control of rock softening modulus，timely increase supporting pressure can effectively control the stability of surrounding rock.