The research on the key factors of surface subsidence in paste backfilling mining of thick coal seam in deep mine is a complex system engineering, which involves mining, backfilling, support, subsidence, safety, and other aspects. At present, there is no systematic research on the key factors of surface subsidence in paste backfilling mining of thick coal seam more than 6 meters in a deep mine. In this paper, field research, laboratory experiments, theoretical analysis, and other research methods are used to carry out the research about 3# coal seam under buildings in the Lu’an area. The main conclusions are as follows: through the construction of the fuzzy extension model of surface subsidence in paste backfilling mining, five types of surface subsidence are obtained, including overburden structure, roof subsidence before backfilling, nonbackfilling account, the strength of filling body, and backfilling technology. It is the key factor to control the surface subsidence; the optimization measures are given to provide a reference for the reasonable design of paste backfilling mining in other working faces. The research conclusion has a certain reference value for solving a series of problems such as coal resources under buildings, solid waste disposal, controlling strata and surface movement, improving the recovery rate of mine resources, and extending the service life of mine.

中文翻译：

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深井厚煤层膏体回填开采影响地表沉降关键因素研究

深部厚煤层膏体充填开采地表沉降关键因素研究是一项复杂的系统工程，涉及开采、充填、支护、沉降、安全等多个方面。目前，对于深井6米以上厚煤层膏体回填开采地表沉降关键因素还没有系统的研究。本文采用野外调查、室内试验、理论分析等研究方法对六安地区建筑物下3#煤层进行了研究。主要结论如下：通过建立膏体回填开采地表沉降模糊可拓模型，得到五种类型的地表沉降，包括覆土结构、回填前顶板沉降、非回填帐户、填充体强度、回填技术。是控制地表下沉的关键因素；给出了优化措施，为其他工作面膏体充填开采的合理设计提供参考。研究结论对解决楼下煤炭资源、固废处置、控制地层和地表运动、提高矿山资源回收率、延长矿山使用寿命等一系列问题具有一定的参考价值。