综采工作面施工对上覆岩体结构及工程稳定性影响研究

Study on Effect for Stability of Upper Rock Structure During Excavating Construction of Lane

随着地下岩体的向深部开挖,工程上覆岩体结构和工程稳定性备受关注。结合山西云冈矿11#层309盘区工程的实际情况,通过支设单点柱、锚网支护、增加超前支护、架设金属网锚索钢梁、钢梁棚施工措施,及时调整采煤工艺等进行施工,并通过数值模拟手段实现本工程施工全过程仿真模拟,为施工提供地层结构的应力应变等情况。结果表明,通过对施工工艺及组织管理的实施,在上履采空区煤柱等地质作用下,可以安全的进行11#层煤矿开采。采用该施工工艺,顺利通过236 m的应力集中区,多采出9.4×104t原煤,同时为接替面的准备和生产争取了时间,为云冈矿上覆煤柱与采空区下掘进巷道提供了可靠的理论依据。

With the deeper excavating construction,the engineering stability becomes more and more important for the upper rock structure.Here,combining with the practical conditions of the 11^# layer in 309 district of Yungang Mine in Shanxi and through establishing single point column support,bolting with wire mesh,increasing ahead support,establishing steel wire netting and steel shed,and adjusting coal mining technology,the stability conditions of strata structure such as stress and strain are provided for construction.The analysis results show that through implementing the effective construction technologies and organization,the stress concentration zone with 236 meters could be passed through smoothly,more than 94,000 tons of coal could be mined,and the time for production could be saved.All these as mentioned above could provide a reliable basis for the excavating construction under the upper coal pillar and mined-out area in Yungang Mine.