倾斜岩层巷道围岩大变形分析与控制方法

Large Deformation and Control Method of Roadway Surrounding Rock in Inclined Strata

深部倾斜岩层巷道由于围岩应力高,巷道围岩变形周期和变形量都较浅部巷道有显著增加.针对曲江矿-850 m东大巷巷道围岩表现出来的两帮和顶底板的实测不对称大变形特征,采用离散元软件建模分析发现:巷道围岩大变形引起围岩塑性区不断扩大,导致锚杆支护结构失效,由此造成原有等强支护方案不能有效控制巷道变形.结合围岩性能提升和结构强化的思路,提出注浆和不等强支护方案.方案实施后,围岩塑性区半径明显减小,围岩变形速度降低、变形时间缩短,实现了巷道稳定的控制目标.

Deep roadway in inclined strata with the high stress of its surrounding rock,the deformation duration time and the measurement of the surrounding rock are different from shallow roadway. Aiming at the large and unsymmetrical deformation characteristics of roof and floor of the -850 m roadway,this paper uses the discrete element software modeling analysis and finds that the large deformation of surrounding rock of roadway causes the plastic zone increase,and finally leads to structural failure of the bolt support. This may cause the original supporting schemes not to effectively control the deformation of roadway. Taking the performance improvement of surrounding rock and structure reinforcement into consideration,this paper proposes the scheme of grouting and unsymmetrical supporting. After the plan has been implemented,the plastic zone radius of surrounding rock has been significantly reduced. The deformation speed and duration time of surrounding rock have been reduced,achieving the goal of roadway stability control.