Failure Mechanism and Optimization of Arch-Bolt Composite Support for Underground Mining Tunnel
Failure Mechanism and Optimization of Arch-Bolt Composite Support for Underground Mining Tunnel
复制标题
DOI：
10.1155/2020/5809385
复制
发表时间：
2020-01
影响因子：
1.8
通讯作者：
Y. Mei;Wei-teng Li;N. Yang;Gang Wang;Tingchun Li;Linlin Sun
中科院分区：
文献类型：
--
作者：
Y. Mei;Wei-teng Li;N. Yang;Gang Wang;Tingchun Li;Linlin Sun
采用改进的数值模拟方法对锚杆组合支护巷道进行了数值模拟试验。以典型软岩巷道为背景，考虑地应力水平、侧压系数、支护类型及支护参数等影响因素。分析了双直壁半圆巷道的破坏机理；结果表明：拱腿向内弯曲变形和拱岩分离是支护体系整体破坏的突破口，锚杆破坏促进了支护体系的破坏过程；分析了加大锚杆直径、以吸能锚杆替代常规锚杆、在拱腿上设置拱锁紧锚杆等控制措施的效果。在某高应力软岩巷道中进行了钢管混凝土-锚杆复合支护方案的现场试验，验证了主要结论的可靠性。
Numerical simulation tests were performed on the arch-bolt combined supported mining tunnel through an improved numerical simulation approach. The typical soft rock roadway was took as the background, and the influencing factors such as ground stress level, lateral pressure coefficient, and support type and parameters were considered. The failure mechanism of a semicircular roadway with two straight walls was analyzed; results showed that the arch legs’ inward bending deformation and the arch-rock separation are the breakthrough of the global failure of the supporting system, and rock bolts breakage promoted the failure process. The effects of different controlling measures were analyzed including enlarging the bolt diameter, replacing the conventional bolts with energy-absorbing bolts, and setting arch locking bolts on the arch legs. The field test of the concrete-filled steel tube (CFST) arch-bolt composite support scheme was carried out in a high-stress soft rock roadway, and the results indicate the reliability of the main conclusions.