基于支护干涉的巷道围岩蝶形塑性区控制方法研究

Control method of butterfly plastic zone of roadway surrounding rock based on support interference

为控制巷道围岩塑性区的蝶形扩展,通过理论分析、数值模拟,对巷道埋深及围岩强度对塑性区形态和范围的影响进行分析,并研究巷道支护方式和支护时机对巷道围岩蝶形塑性区的影响。研究表明,巷道埋深及围岩本身的强度对塑性区的形态和范围有显著的影响。随着巷道埋深的增加和围岩强度的减小,巷道围岩塑性区半径相应增大,蝶形塑性区蝶叶扩展越加明显。巷道围岩蝶形塑性区是可以通过现有支护手段进行控制的,巷道开掘后,选择合适的支护时机,通过支护、注浆等方式提高巷道浅层围岩强度,对巷道施加较大支护阻力,并对可能出现蝶叶扩展的巷道部位进行加强支护,可有效抑制塑性区蝶形扩展。研究为深部巷道围岩大变形和重大动力灾害防治提供了新的思路。

In order to control the butterfly expansion of the plastic zone of the roadway surrounding rock,the influence of the roadway depth and the strength of surrounding rock on the shape and scope of the plastic zone are studied through theoretical analysis and numerical simulation,and the influence of supporting mode and supporting time point on the butterfly plastic zone of the surrounding rock of the roadway are analyzed.The researches show that the depth of roadway and the strength of surrounding rock have a significant impact on the shape and scope of plastic zone.With the increase of roadway depth and the decrease of surrounding rock strength,the radius of plastic zone of roadway surrounding rock increases correspondingly,and butterfly leaves of butterfly plastic zone expands more obviously than before.The butterfly plastic zone of surrounding rock of roadway can be controlled by the existing support means.After the roadway is excavated,the expansion of butterfly plastic zone can be inhibited by choosing the appropriate supporting time,improving the strength of the shallow surrounding rock of roadway by supporting and grouting,applying large supporting resistance to surrounding rock of roadway,and strengthening the supporting of the roadway where butterfly leaf expansion may occur.The research yields into insight for the prevention of large deformation and major dynamic disasters of surrounding rock in deep roadway.