论文部分内容阅读
通过钻孔窥视、围岩强度测试及地应力测试,得到围岩结构、强度以及地应力的大小和方向,为巷道支护设计提供直观、准确、可靠的依据。由数值计算可知,锚杆与锚索不同的布置方式所形成压应力区域叠加效果不同,两者分开交替布置可使得压应力区域相互叠加和重合,有利于巷道围岩的整体稳定;在保证合理预应力水平的前提下,锚杆排距可以适度放大,而锚杆长度可适当缩短,不仅有利于降低支护成本,而且可以加快巷道掘进进尺。
Through drilling peering, rock strength test and in-situ stress test, the size and direction of surrounding rock structure, strength and in-situ stress are obtained, which can provide a direct, accurate and reliable basis for roadway support design. It can be known from the numerical calculation that the compressive stress regions formed by different arrangement of anchor rod and anchor cable have different superposition effects, and the alternating arrangement of the two can make the compressive stress regions superpose and coincide with each other, which is in favor of the overall stability of the surrounding rock; Prestressed level of the premise, the bolt spacing can be modestly enlarged, while the length of the anchor can be properly shortened, not only help to reduce support costs, but also can speed up the tunneling footage.