论文部分内容阅读
在现场原位探测与实验室组分实验基础上,分析测试了典型巷道顶板软弱夹层的赋存特征和岩性组成,得到了软弱夹层岩体黏土成分遇水泥化特性和不同支护方式下注浆固结体内聚力C与内摩擦角φ的演化规律.结合数值计算与相似材料模拟等手段研究了软弱夹层不同层位、泥化特性和动压影响导致软弱夹层顶板巷道失稳垮冒的规律.结果表明:软弱夹层位于锚杆锚固区边缘时顶板安全状况最差,渗水泥化后围岩结构承载力学性能急剧降低,动压作用后软弱夹层岩体发生剪切破坏使得顶板失稳垮冒.提出了针对软弱夹层渗水泥化巷道的安全控制对策,并成功应用于现场工业性实践.
Based on the in-situ detection and laboratory component experiment, the occurrence characteristics and lithology composition of the soft interlayer in the typical tunnel roof are analyzed and tested, and the clay composition of the soft interlayer rock mass is obtained under the conditions of cementing and different support methods The law of cohesion C and internal friction angle φ of cement mortar, and the law of instability and collapse of the roof of soft interlayer is studied by means of numerical calculation and simulation of similar materials. The results show that the roof is in the worst condition when the weak interlayer is located at the edge of anchorage zone of anchorage zone, the bearing capacity of surrounding rock structure is drastically reduced after the seepage cementation, and the shear failure of the weak intercalated rock mass makes the roof unstable The safety control measures for the infiltration of soft interlayer roadway are put forward and successfully applied to field industrial practice.