关键词:

弱胶结软岩 , 膨胀性 , 围岩稳定性 , 钻孔注浆

Abstract: Aiming at the problems of significant roof settlement and bolt fracture of expansive and weak-cemented soft rock roadways in western China, in No. A4301 transportation gateway of Six mine of Sail, the physical and mechanical characteristics of weak-cemented soft, the deformation and failure characteristics of roadway surrounding rock and the instability mechanism of anchorage body were studied. Then, the corresponding surrounding rock control technology was put forward and applied in the field. The results showed that the clay mineral content of the weakly cemented rock on the roadway roof was high, among which the montmorillonite content was more than 10%, the average disintegration time of sandy mudstone was 0.97h, and the average expansion rate was 5.43%, which had significant expansion. The self-stabilization ability of expansive and weak-cemented soft rock roadways was poor, and affected by the fissure water of No.5 coal seam, the roof subsidence and floor heave were strong, and the failure rate of bolt support was high. The role of bolt support is to enhance the equivalent cohesion of surrounding rock in the anchorage range. The greater the pre-tightening force applied, the better the supporting effect was obtained. Under the requirement of supporting strength, the deformation of bolt should be coordinated with the subsidence of roof separation. The field practice shows that the coupling control technology of "anchor network cable-spray-injection" can effectively control the deformation and failure of the surrounding rock of expansive and weak-cemented soft rock roadways, which provides a reference for the stability control theory and technology of surrounding rock engineering of this kind of roadway.