Zhang Wenquan, Lei Yu, Shao Jianli, Wu Xunan, Li Song, Ma Chaoqun
State Key Laboratory of Strata Intelligent Control and Green Mining Co-founded by Shandong Province and the Ministry of Science and Technology, Qingdao, 266590, China.
National Experimental Teaching Demonstration Center for Mining Engineering, Shandong University of Science and Technology, Qingdao, 266590, China.
Sci Rep. 2022 Oct 11;12(1):17049. doi: 10.1038/s41598-022-21654-x.
We have investigated the activation characteristics of mining faults and the effect of grouting reinforcement under thick loose layer and thin bedrock of the working face and evaluate their impact on the safety of mining at similar working faces. Implementing the geological conditions of the 331 working face of the Yangcun Coal Mine (China) of the Yankuang Energy Group Corporation, we have analyzed mechanically the process of fault activation at first. Subsequently, we have obtained the mechanical criterion of fault slip and the expression of relative strength of the nearby rock mass. Using numerical software we have simulated and analyzed the damage characteristics of different bedrock thicknesses on overlying rocks and faults in the fluid-solid coupling mode. In addition, we have studied the controlling effect of grouting reinforcement on fault activation, which has been verified in the field. The main results of our study show that: 1. The mechanical properties of the rock mass near the fault interface have changed and they are related to the cohesive force of the interface; 2. The water inrush mode of the working face changes under different bedrock thickness, and the thinner the bedrock, the less easily the fault is destroyed 3. The slip of the high-level fault is reduced after the grouting of the fault, the propagation of the fracture zone at the fault is suppressed, the seepage of the aquifer water is prevented, and the safe recovery is realized. The results of our study provide a scientific basis for the secure mining across the fault of the 331 working face of Yangcun Coal Mine. Based on the results of our study the working face can be mined safely from now on and in the future.
我们研究了工作面厚松散层薄基岩条件下采动断层活化特征及注浆加固效果，评估了其对类似工作面开采安全的影响。结合兖矿能源集团公司杨村煤矿（中国）331工作面的地质条件，首先对断层活化过程进行了力学分析。随后，得出了断层滑动的力学判据及附近岩体相对强度表达式。利用数值软件，以流固耦合方式模拟分析了不同基岩厚度对上覆岩层及断层的破坏特征。此外，研究了注浆加固对断层活化的控制作用，并在现场得到了验证。研究的主要成果表明：1. 断层界面附近岩体力学性质发生改变，且与界面黏聚力有关；2. 不同基岩厚度下工作面突水模式发生变化，基岩越薄，断层越不易破坏；3. 对断层进行注浆后，高位断层滑动减小，断层处裂隙带扩展受到抑制，含水层水的渗流得到阻止，实现了安全回采。研究成果为杨村煤矿331工作面跨断层安全开采提供了科学依据。基于研究成果，该工作面从现在起及未来均可实现安全开采。
