Li Qinghai, Shi Weiping, Qin Zhongcheng
State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao, 266590 China.
College of Geomatics, Shandong University of Science and Technology, Qingdao, 266590 China.
Springerplus. 2016 Aug 17;5(1):1355. doi: 10.1186/s40064-016-3031-6. eCollection 2016.
In mine roadway support operations, floor bolting not only played a role in floor heave control, but also in reinforcing roof and its two sides. Correspondingly, bolting of roof and two sides also played a part in floor heave control. To quantify the effect of such bolting, based on roadway support in extremely weak rock, three physical models were produced and tested in laboratory. Through comparison of their displacements in three physical simulation experiments, the reinforcing effect of bolting in extremely weak rock roadways was quantified. Reinforcing coefficients was defined as displacement ratio between original support and new support regime. Results indicated that the reinforcing coefficients, for bolting of roof and its two sides, on floor, two sides, and roof reached 2.18, 3.56, and 1.81 respectively. The reinforcing coefficients for floor bolting on floor, two sides, and roof reached 3.06, 2.34, and 1.39 respectively. So in this extremely weak rock, the surrounding rock should be considered as an integral structure in any support operation: this allows for better local strength improvement, and provided future design guidance.
在煤矿巷道支护作业中，底板锚杆支护不仅对控制底鼓有作用，而且对加固顶板及其两侧也有作用。相应地，顶板及两侧的锚杆支护对控制底鼓也有作用。为了量化这种锚杆支护的效果，基于极软岩巷道支护，制作了三个物理模型并在实验室进行了测试。通过比较三个物理模拟实验中的位移，量化了极软岩巷道锚杆支护的加固效果。加固系数定义为原支护与新支护状态下的位移比。结果表明，顶板及其两侧、底板、两帮和顶板锚杆支护的加固系数分别达到2.18、3.56和1.81。底板锚杆支护在底板、两帮和顶板的加固系数分别达到3.06、2.34和1.39。因此，在这种极软岩中，在任何支护作业中都应将围岩视为一个整体结构：这有利于更好地提高局部强度，并为未来的设计提供指导。
