膏体充填开采底板破坏机理及分区治理技术
Study on floor failure mechanism of paste backfill mining and division area control technology
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摘要: 针对岱庄煤矿高承压水上、建筑物下长壁膏体充填工作面安全采煤的问题，采用理论分析、数值模拟及现场实测相结合的方法，提出了膏体充填开采工作面的等效巷道底板破坏理论，并基于该理论对膏体充填开采工作面底板破坏的时空效应进行了分析，得到膏体充填工作面底板塑性破坏区及其范围。根据岱庄煤矿11607试验工作面的现场实际，通过FLAC3D数值模拟结果得出：当试验工作面充填步距自1.2 m上升至3.6 m时，工作面底板岩层已贯通的塑性区深度未发现明显变化，已贯通的塑性区延伸至底板泥岩和细粒砂岩层，其深度约为3.6 m。结合岱庄煤矿11607试验工作面底板岩层导水裂隙的种类，将其底板岩层划分为底板完整区、构造发育区及底板薄弱区，并针对底板不同划区，提出膏体充填工作面底板破坏分区防治技术措施。通过现场注水试验法对试验工作面底板破坏深度进行探测，结果显示试验工作面底板最大破坏深度在3 m左右。Abstract: Aiming at the problem of the safety mining problems of longwall paste filling working face under buildings on high confined water in Daizhuang Coal Mine, through theoretical analysis, numerical simulation and field measurement, the equivalent roadway floor failure theory of paste filling mining face is proposed, based on this theory, the spatial-temporal effect of floor failure in paste filling mining face was analyzed, and the plastic failure zone and its range were obtained. Based on the field practice of 11607 test working face in Daizhuang Coal Mine and the results of FLAC3D numerical simulation, the following conclusions are obtained: when the filling interval of the test working face increases from 1.2 m to 3.6 m, there is no obvious change in the plastic zone depth of the floor strata in the working face, and the plastic zone extends to floor mudstone and fine-grained sandstone with a depth of about 3.6 m. According to the types of water-conducting cracks in the floor strata of the test working face 11607 in Daizhuang Coal Mine, the floor strata are divided into the floor intact area, the structure developed area and the floor weak area, and according to the different zones of the floor, the technical measures to prevent and control the floor failure in the paste filling working face are proposed. The failure depth of the floor of the test working face was detected by the on-site water injection test method, and the results showed that the maximum failure depth of the floor of the test working face was about 3 m.
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Keywords:
- paste filling /
- equivalent roadway /
- floor failure /
- numerical simulation /
- regional governance
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