逆断层倾角对断层两侧巷道围岩稳定性的影响

运用UDEC数值模拟软件,建立40°、60°、80°3种倾角的逆断层模型。通过分析巷道围岩塑性破坏特征、顶底板和两帮的移近量以及围岩垂直应力分布特征,研究逆断层倾角和上下盘关系对两侧巷道围岩稳定性的影响。研究结果表明:巷道在逆断层上盘时,随断层倾角增大,围岩稳定性有降低的趋势;若巷道布置在逆断层下盘,断层倾角为60°时巷道围岩稳定性最差;若巷道布置在逆断层下盘,则顶底板移近量均小于在上盘时,而围岩塑性区范围、两帮移近量和巷道两侧应力的集中程度大于上盘,且断层倾角越大差值越大。

The Effect of Reverse Faults Angle on the Stability of Surrounding Rock of Roadways on Both Sides of the Faults

Three reverse fault models with the angle of 40°,60° and 80°are established by using the numerical simulation software UDEC. The effects of reverse faults angle and the relationship of the upper and lower of the faults on the stability of surrounding rock of roadways on both sides of the faults are discussed in detail by analyzing the plastic failure characteristics of roadway surrounding rock,displacement of roof and floor and both sides of drift and vertical stress distribution characteristics of surrounding rock. The study results show that:when the roadway is distributed in the upper of reverse faults,the stability of sur-rounding rock has a lower tendency with the increasing of fault angle;when the roadway is distributed in the lower of reverse faults and the fault angle is 60°,the stability of surrounding rock is he worst;besides that,the displacement of roof and floor when the roadway is distributed in the lower of reverse faults is less than the one of roof and floor when the roadway is distribu-ted in the upper of reverse faults,the scope of plastic zone of surrounding rock,displacement and stress concentration of bosh sides of roadway in the upper of reverse faults are higher than that of the lower of reverse faults,and the greater the fault angle, the greater the difference value.