破碎围岩注浆加固扩散机理及应用研究

Research on the Grouting Diffusion Mechanism and its Application of Grouting Reinforcement for Fractured Surrounding Rock

煤层回采过程中,上个工作面的回风巷通常需作为接替工作面进风巷,是典型的重复采动影响巷道,受采动影响围岩破碎,对于工作面的回采存在较大隐患。针对从破碎围岩采用传统注浆加固工艺的不足,提出层次注浆工艺进行围岩加固,对其注浆加固机理进行了探讨,并对其进行了应用和效果检验。研究结果表明,浆液快速硬化的特性,使得浆液短时间内可在煤体表面形成止浆层,后期漏浆逐渐较少,浆液向深部扩散,注浆量较大,扩散半径和扩散深度均得到保证;煤体裂隙基本被浆液充满,注浆效果较好;两帮累计移近量最大约294 mm,顶底板累计移近量最大539 mm,均小于注浆前,注浆对巷道变形起到了很好的控制作用。

In mining process,a working face return air lane usually need to succeed as working face intake,was typical of the influence of repeated mining roadway influenced by mining working face for surrounding rock,there was a big risk,according to the shortcomings of the traditional from the surrounding rock grouting reinforcement technology,this layer grouting technology and rock reinforcement,discusses the the mechanism of grouting reinforcement,and tested the application and effect. The results show that： the characteristics of the rapid hardening of slurry,the slurry in a short period of time can be formed on the surface of the coal slurry layer,the latter less leakage of slurry,slurry diffusion to the deep,a large amount of grouting,diffusion radius and diffusion depth are guaranteed; the coal seam was filled with grout,and the grouting effect was good; the two groups of the maximum displacement of about 294 mm,the top floor of the total displacement of the near maximum 539 mm,are less than before grouting,grouting on the roadway deformation played was very good control.