中文摘要：

为提高巷道穿越断层破碎带区域围岩强度,解决巷道坍塌失稳问题,并为后期巷道锚固支护提供基础,利用地表预注浆对顾北煤矿巷道穿越F104断层破碎带深部区域局部岩体进行加固。注浆前期表现出泄压特征,注浆压力无法上升;采用分段–间断–重复注浆策略,可使前期注入浆液固化充填大开度的吸浆通道,防止浆液过度扩散,并为浆液注入较小裂隙创造了条件,实现对目标区域充填密实度的最大化。注浆后断层破碎带中心段浆液结石体呈丝络状分布,偶见水泥结石体粗脉;两侧边缘岩芯的浆液结石体呈脉络状分布。注浆增加了围岩完整性,加强了破碎岩体的相互镶嵌作用,提高了巷道掌子面稳定性;地表注浆对区域围岩裂隙进行充填胶结,减少了裂隙自由面空间,泥岩渐近泥化得到有效遏制,间接提高围岩强度;极破碎围岩注浆后浆–岩结石体表现出类混凝土状特征。地表预注浆使巷道稳定性得到有效保证,极大提高了岩体的自身承载能力及抗变形能力,开挖成型巷道表面收敛位移及收敛速率显著减少。

英文摘要：

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.