【摘要】 为克服弱胶结软岩钻孔塌陷、遇水软化及崩解给常规地应力测试带来的困难,提出了弱胶结软岩矿区巷道围岩位移反演地应力分析方法.通过在圆形巷道位移解中引入几何修正系数,运用阻尼最小二乘法求得了直墙半圆拱巷道顶板、两帮、底板的修正位移解,基于伊犁四矿软岩巷道围岩位移测试数据,反演得到了该矿区的地应力分布,并结合数值分析进行了地应力正演验证.结果表明:巷道位移修正解、数值模拟值和现场监测值吻合度较高;该矿区地应力场以自重应力为主,最大水平应力是垂直应力的0.7~0.8倍,其方向为NNE~SSW,方位角为10°~20°,对巷道掘进方向和采区布置的影响具有明显的方向性.更多还原

【Abstract】 For overcoming the difficulty of in-situ stress testing caused by borehole collapse,softening and disintegration under water in weakly consolidated soft rock,an inversion analysis method of initial in-situ stress was proposed.On the basis of damped least square method,the improved displacement solutions of roof,floor and wall of straight wall-semicircle arch roadway were respectively established by introducing the geometric modified coefficients to revise the theoretical displacement solutions of circular roadway.The distribution of in-situ stress was determined according to the field displacement test data of roadway in Yili No.4,and forward verification for in-situ stress was carried out by numerical analysis.The results show that the improved displacement solution of roadway is highly fitted with the numerical simulation and field test data.The gravity stress is the dominant geostress in the testing mining area,and the maximum horizontal principal stress is 0.7~0.8times the vertical stress.The direction of maximum horizontal stress dimension is N10°E~N20°E,which is important directional influence on drivage and arrangement of roadway.更多还原