最大水平主应力对巷道围岩稳定性的影响研究

Influence of the Maximum Horizontal Principal Stress to the Stability of the Roadway Surrounding Rock

基于金川三矿实测地应力和某分段巷道,采用理论分析,得出了σHv型应力场下巷道的最优布置夹角,针对最大水平主应力与巷道轴线呈不同夹角时的巷道布置,采用FLAC3D数值模拟软件进行数值模拟,对其应力分布、塑性区分布和围岩位移进行对比研究。结果表明,在σHv型应力场下,巷道的最优布置方式是与最大水平主应力成某一角度;当夹角达到一定程度时,巷道顶底板会出现大小相当的环向应力;引起巷道底板变形破坏的重要原因是水平应力。

Based on the actual measured ground stress of Jinchuan third Mine and a segment road-way,by theoretical analysis method,the optimal placement angle of roadway under the σHv-type stress filed is obtained.Based on FLAC3D simulation software,the roadway arrangement is simulated under the condition of the difference angle of maximum horizontal principal stress and roadway axis,besides that, the stress distribution,plastic zone distribution and surrounding rock displacement are conducted contrast analysis.The result show that in the σHv type stress field,the optimal arrangement of the roadway is form-ing a certain angle with the maximum horizontal stress;when the angle reaches a certain level,the roof and floor of the roadway will appear the hoop stress,the horizontal stress is the main factor that cause the deformation and destruction of the roadway floor.