动压高帮回采巷道围岩稳定性控制研究

Research on the stability control of surrounding rock in the roadway with dynamic pressure and high slope

动压高帮回采巷道是指受动压影响严重、巷帮高度较大的巷道,该类巷道不仅在掘进期间要经历掘进过程的扰动,而且在后期使用过程中要先后经历相邻工作面和本工作面的回采扰动,使得该类巷道的围岩变形破坏过程异于常规的回采巷道,且高帮围岩的稳定性相对较弱。以某矿动压高帮回采巷道15312工作面进风平巷为研究对象,采用数值模拟和现场监测相结合的方法研究了动压高帮回采巷道变形破坏机理,并据此优化了动压高帮回采巷道的支护参数。通过分析15312工作面进风平巷的破坏特征,得出影响该进风平巷围岩稳定性的因素主要包括围岩自身强度、巷道断面尺寸、围岩所处的应力环境和围岩支护强度。从围岩自身强度低、巷道断面尺寸大和围岩所处的应力环境较为复杂的角度控制巷道稳定性较为困难,因此确定从优化巷道支护参数的角度来提高巷道整体的稳定性,即采取增大巷道两帮支护强度和支护范围的措施。数值模拟仿真结果表明,支护参数优化后的围岩支护应力场近似呈圆形,且其帮部围岩支护应力场范围较大,更适合15312工作面进风平巷围岩稳定性控制。现场锚杆和锚索受力情况监测结果表明,支护参数优化后,能实现动压高帮回采巷道的围岩稳定性控制,围岩变形量较小,控制效果较好。

The roadway with dynamic pressure and high slope refers to the roadway which is seriously affected by dynamic pressure and has a high slope.This type of roadway not only experiences disturbances in the excavation process,but also has to experience the disturbance of the adjacent working face and this working face in the later mining process.This makes the deformation and destruction process of the surrounding rock of this kind of roadway different from that of the conventional mining roadway,and the stability of the surrounding rock with high slope is relatively weak.Taking the air intake roadway of a mine's roadway with dynamic pressure and high slope of 15312 working face as the research object,the deformation and damage mechanism of the roadway with dynamic pressure and high slope is studied by using a combination method of numerical simulation and on-site monitoring.And the support parameters of the roadway with dynamic pressure and high slope are optimized accordingly.By analyzing the damage characteristics of the air intake roadway of 15312 working face,it is concluded that the factors affecting the stability of the surrounding rock of the air intake roadway mainly include the strength of the surrounding rock,the size of the roadway section,the stress environment of the surrounding rock and the strength of the surrounding rock support.It is difficult to control the stability of the roadway from the perspective of the low strength of the surrounding rock itself,the large size of the roadway section and the complex stress environment in which the surrounding rock is located.It is proposed to improve the overall stability of the roadway from the perspective of optimizing the roadway support parameters,which is taking measures to increase the support strength and support range of the two sides of the roadway.Numerical simulation results show that the surrounding rock support stress field after the optimization of the support parameters is approximately circular,and the surrounding rock support stress field of the side wall is larger.The result is more suitable for the stability control of the surrounding rock of of the air intake roadway of the 15312 working face.The monitoring results of on-site anchor rods and anchor cables show that after the optimization of the support parameters,the stability control of the surrounding rock of the roadway with dynamic pressure and high slope can be achieved,the deformation of the surrounding rock is smaller,and the control effect is better.