采矿巷道围岩变形机制数值模拟研究

研究了大冶铁矿龙洞-62 m、-74 m水平采矿巷道开挖后的二次应力分布及巷道变形机制。首先根据现场工程地质勘查和室内岩石力学试验对巷道围岩进行了工程地质分组和岩石力学参数确定；在此基础上运用FLAC3D数值模拟软件研究了巷道开挖后的应力应变状态，分析了围岩变形机制；并根据-74 m水平采矿巷道的收敛监测数据对比验证了数值模拟结果。研究结果表明，围岩条件不同的采矿巷道其二次应力分布影响范围有所差异，但围岩主应力总体上表现为由巷道边墙中下部位的压应力集中带逐步过渡到拱顶、底板一定范围内的拉应力集中带。

Numerical simulation of wall rock deformation mechanism of mining tunnel

The secondary stress distribution and deformation mechanism of excavated mining tunnel of -62 m, -74 m in Daye mine are studied. Firstly, the wall rocks of tunnel are grouped to different engineering geology groups; and the rock mechanical parameters of wall rock are determined based on geological investigation of field engineering and indoor rock mechanical experiment. The state of stress and strain of excavated tunnel is simulated by FLAC3D; and the wall rock deformation mechanism is also analyzed. The numerical simulation results are validated by convergence monitoring data of -74 m mining tunnel. The results show that the ranges of secondary stress distribution have differences corresponding to different wall rock conditions of mining tunnel; but the principal stress distribution transits from compressive stress centralized in mining tunnel sidewall to tensile stress centralized in mining tunnel vault and floor.