破碎围岩无机材料注浆加固机理及其应用研究

巷道开挖后,围岩受采动影响及矿压作用而发生破坏,破碎的围岩严重威胁煤矿安全生产,注浆加固是消除威胁的有效手段.采用最优配比试验优选出新型无机注浆材料最佳配比,对新型注浆材料注浆加固机理和固结特性以及流动时间进行了研究,并对新型注浆材料现场加固进行了应用分析,研究结果表明:煤体表面孔隙被絮状凝胶和水化产物充填,提高了界面...

Research and Application of Reinforcement Mechanism of Inorganic Materials in Broken Rock

After the excavation of the roadway, the surrounding rock is affected by mining, and the surrounding rock is damaged by the mineral pressure. The broken surrounding rock seriously threatens the safe production of coal mines. Grouting reinforcement is an effective means to eliminate the threat. The optimal ratio test was used to select the best ratio of the new inorganic grouting material. The grouting reinforcement mechanism, consolidation characteristics and flow time of the new grouting material were studied, and the application analysis of the new grouting material on-site reinforcement was carried out. The results show that: (1) The pores on the coal surface are filled with flocculent gel and hydration products, which improves the strength of the interface cementation, and enhances the integrity and compactness; (2) Consolidated coal has high compressive strength, which can reach 13.1 MPa when cured for 8 hours; (3) The grout can be evenly distributed between the stones and river sand, and the three are bonded together to play a role of reinforcement; (4) The deformation of the grouting-reinforced section is less than that of the unreinforced section. After injecting new inorganic grouting materials, the coal bearing capacity is improved, which has a good effect on maintaining the stability of the roadway.