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针对赵固一矿11011工作面大埋深薄基岩厚覆盖层下煤层开采难度大,存在涌水涌砂威胁的现状,采用现场调研与统计分析方法,论述了薄基岩突水威胁煤层涌水涌砂的条件。其基本顶关键层周期性破断后形成“砌体梁”结构。此文利用“短砌体梁”及失稳后呈“台阶岩梁”的理论解析验算后认为,该面顶板结构极易产生回转及滑落失稳,进而形成突水通道。在此基础上还采用相似模拟试验的方法,分析了采场上覆岩层破坏、运移演化规律,确定了该面顶板垮落带高约17 m,导水垮裂带高约48 m,故若在此范围内存在含水层或流砂层,应及时采取措施。课题组还用实测法验证了工作面采后覆岩破坏高度,并制订了预防顶板突水开采方案,为类似条件下煤矿防治顶板突水安全开采提供参考。
In view of the fact that the coal seam is difficult to be drilled under the thick overburden of the 11011 working face in Zhaoge No.1 Mine, there is a threat of gushing sand and water. By means of field investigation and statistical analysis, Sand conditions. The basic top critical layer is periodically broken to form a “masonry beam” structure. In this paper, after using “short masonry beam” and the “rock beam” after instability, the theoretical analysis shows that the roof structure is prone to slewing and sliding instability, which leads to the formation of water inrush channel. On the basis of this, a similar simulation test is also used to analyze the law of failure and migration of overburden strata in the stope. It is determined that the roof caving zone is about 17 m high and the aqueduct is about 48 m high If there is aquifer or runoff in this area, measures should be taken in time. The research group also verified the height of overburden rock damage after mining by using the actual test method and formulated the plan for preventing water inrush from the roof to provide reference for coal mine prevention and control of roof water inrush safety under similar conditions.