摘要
深井厚煤层开采强采动煤巷面临着深部高应力复杂环境、围岩裂隙高度发育拓展以及采掘扰动影响范围大的地质难题。为了探究深部厚煤层开采强采动煤巷围岩控制的合理方案,以古汉山煤矿1605采煤工作面回风巷为工程背景,采用数值模拟、理论分析和现场实践相结合的方法开展深部厚煤层开采强采动煤巷围岩破坏机理及控制技术研究。通过引入偏应力第二不变量(J_(2))研究指标以克服传统单一应力指标缺陷,研究了超前工作面不同位置时的巷道围岩偏应力第二不变量及巷道围岩塑性区分布特征,揭示了工作面超前段巷道围岩变形破坏机理,针对性地提出了“巷帮全锚索固帮+顶板锚杆索联合撑顶+顶帮钢筋网敷设”的围岩综合控制技术。现场工程实践表明,巷道两帮和顶底板最大移近量在可控范围内,实现了对深部厚煤层开采强采动煤巷围岩的有效控制。
Mining of strong dynamic pressure coal roadways in deep thick coal seams faces geological challenges such as complex environments with deep high stress,high development and expansion of surrounding rock fractures,and a large range of mining disturbances.Therefore,in order to explore a reasonable plan for controlling the surrounding rock of the strong dynamic pressure coal roadway in deep thick coal seam mining,taking the return airway of the No.1605 mining face of Guhanshan Coal Mine as the engineering background,a combination of numerical simulation,theoretical analysis,and on-site practice was used to conduct research on the failure mechanism and control technology of the surrounding rock of the strong dynamic pressure coal roadway in deep thick coal seam mining.By introducing the second invariant of deviating stress(J_(2))research index to overcome the defect of traditional single stress index,the second invariant of deviating stress in surrounding rock of roadway and the distribution characteristics of plastic zone in surrounding rock of roadway at different positions of advanced working face were studied,and the deformation and failure mechanism of surrounding rock of roadway in the front section of the working face were revealed.The comprehensive control technology of surrounding rock of"full cable of roadway sides+roof bolt(cable)combined support+roof side reinforcement mesh laying"was proposed accordingly.The on-site engineering practice show that the maximum displacement of the two sides and the roof and floor of the roadway is within a controllable range,achieving effective control of the surrounding rock of the strong dynamic pressure coal roadway in deep thick coal seam mining.
作者
董社
Dong She(Guhanshan Coal Mine,Jiaozuo Coal Industry Company,Henan Energy Group Co.,Ltd.,Jiaozuo 454000,China)
出处
《能源与环保》
2024年第5期276-281,共6页
CHINA ENERGY AND ENVIRONMENTAL PROTECTION
关键词
深井
厚煤层
强采动
破坏机理
联合控制
deep well
thick coal seam
strong dynamic pressure
failure mechanism
joint control
