动压影响下的软岩巷道加固治理技术研究

Research on reinforcement and treatment technology for soft rock roadway under dynamic pressure

针对动压影响下软岩巷道围岩变形强烈、难支护的技术难题,以湾田煤矿运输下山为研究对象,采用理论分析建立了巷道塑性范围计算模型,得出顶部及两帮的最大塑性区范围分别为9.8、13.6m,同时对比分析了动压对塑性区发育范围的影响,得出巷道上覆工作面采动对巷道稳定性存在明显影响。结合巷道围岩窥视结果及理论计算得到的巷道塑性区破坏范围,提出浅部和深部注浆相结合的全断面双壳锚注加固支护技术,并进行了井下工业性试验。实践表明,采用双壳注浆后进行全断面高预应力锚网支护能有效控制强烈动压影响软岩巷道围岩变形。

According to the serious surrounding rock deformation and difficult support technical problems of the mine soft rock roadway under the influences of the dynamic pressure,take a transportation dip in Wantian Coal Mine as a study object,a theoretical analysis was applied to establish a plastic scope calculation model of the mine roadway and a maximum plastic zone scope obtained in the top and two sidewalls was 9.8 m and 13.6 m individually. Meanwhile,a comparison and analysis were conducted on the dynamic pressure affected to the development scope of the plastic zone and the mining operation of the coal mining face in the overburden strata above the mine road could have obvious influences to the stability of the mine roadway. In combination with the peering results from the surrounding rock of the mine roadway and the theoretical calculation,the failure scope of the plastic zone in the mine roadway was obtained,a full cross section double-shell bolt and grouting reinforcement support technology combined with the shallow and depth grouting was provided and the industrial trial in the underground mine was conducted. The practices showed that after the double-shell grouting applied,the full cross section high pre-stressed bolt and steel mesh support could effectively control the surrounding rock deformation of the soft rock roadway under the influences of the serious dynamic pressure.