软岩巷道锚注联合支护的数值模拟研究

以葛泉矿-190南翼运输大巷为研究对象,采用UDEC数值模拟软件对该巷道在全断面锚喷支护和全断面注浆与锚喷联合支护两种条件下围岩应力分布、围岩塑性区范围、围岩位移和锚杆受力情况进行了分析。结果表明:注浆能够改善锚杆受力状况;全断面注浆与锚喷联合支护能够改善围岩应力分布状况,缩小围岩塑性区范围,在巷道周边形成圆形承载拱,从而保证围岩的长期稳定。工程应用表明,通过数值模拟确定的支护方案是合理的。

Numerical Simulation of Combined Bolting-Shotcreting-Grouting Support of Soft Rock Roadway

Taking the-190 level southern roadway in Gequan coal mine in China as the object of study,the numerical analysis of stress distribution,plastic zone,displacement of surrounding rock and stress state of rock-bolt under the conditions of both shotcrete-bolt support and combined bolting-shotcreting-grouting support was carried out with UDEC software.The result shows: the stress state of rock-bolt can be improved by grouting surrounding rock;combined whole section bolting-shotcreting-grouting support can improve the stress distribution,and can decrease the size of plastic zone in surrounding rock,resulting in a loop bearing structure near by the periphery of roadway and the long-term stabilization of the surrounding rock.The engineering practice shows that the support scheme determined by numerical simulation is reasonable.