断层破碎带深部区域地表预注浆加固应用与分析

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Abstract In order to improve the fault fracture zone strength，keep the roadway stability and create good condition for later anchorage supporting，ground surface pre-grouting reinforcement technology is applied to reinforce deep local rock mass of F104 fault fracture zone where roadways across in Gubei coal mine. Pre-stage grouting showed pressure relief characteristics，injection pressure can not rise quickly. The multistage-discontinuous- repeated grouting strategy allowed the cement slurry pre-injected into the fractures curing and larger channels blocking，it would prevent the slurry diffusion too large to escape and create conditions for grout injecting fracture with smaller opening. The grout distribution is look like wire winding shape and thick veins of grout distributed occasionally in central section of the fault fracture zone after grouting. In both sides of the fault fracture zone，the grout distribution is look like veins. Ground surface pre-grouting increasing the integrity of rock，strengthening the broken rock inter-lock ability and improving the tunnel face stability. Grouting filled and cemented the fractures would reduce the fractures free space and contain mudstone asymptotic mudding effectively which improve the strength of surrounding rock indirectly；the extremely broken surrounding rock with solidified grout is similar to concrete. Pre-grouting guarantee effectively stability and improve significantly self-bearing capacity and resistance to deformation ability of the surrounding rock mass which cause the surface convergence displacement and its’ rate decreased markedly.

Key words： mining engineering fault fracture zone ground surface pre-grouting controlling surrounding rock deformation

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	Articles by authors
	LIU Quansheng1
	2
	LU Chaobo1
	LU Haifeng2
	LIU Xuewei1

Cite this article:

LIU Quansheng1,2,LU Chaobo1, et al. APPLICATION AND ANALYSIS OF GROUND SURFACE PRE-GROUTING STRENGTHENING DEEP FAULT FRACTURE ZONE[J]. , 2013, 32(s2): 3688-3695.

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https://rockmech.whrsm.ac.cn/EN/Y2013/V32/Is2/3688

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