Determination of advancing distance of sealing hole for water-releasing borehole in working face floor
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摘要: 为减小工作面回采过程中超前支承压力对工作面周围放水孔的影响，有必要研究底板放水孔封孔超前距。以杨庄煤矿Ⅲ610孤岛工作面为例，建立了工作面工程地质模型，采用FLAC3D数值模拟软件，对工作面回采过程中超前支承压力影响范围进行了研究，结果表明该工作面超前支承压力影响范围为20~30 m。对工作面超前支承压力影响范围进行了理论计算，考虑重复采动影响时的结果为29.81 m，与数值模拟结果基本一致。根据数值模拟、理论计算及现场实测结果，确定Ⅲ610孤岛工作面底板放水孔封孔超前距为30 m，并通过实践验证了该封孔超前距的合理性。Abstract: In order to decrease the influence of advancing abutment pressure on water-releasing borehole around working face during mining process, it is necessary to research advancing distance of sealing hole of water-releasing borehole in floor. An engineering geological model was established taking Ⅲ610 isolated working face of Yangzhuang Coal Mine as an example, and influence range of advancing abutment pressure of the working face during mining process was researched by use of FLAC3D numerical simulation software. The simulation result shows that the influence range is 20-30 m. The influence range of advancing abutment pressure was also theoretically calculated with a result of 29.81 m when considering repeated mining influence, which was basically consistent with the numerical simulation result. According to results of numerical simulation, theoretical calculation and field test, advancing distance of sealing hole of water-releasing borehole in floor of Ⅲ610 isolated working face is determined as 30 m, and its rationality was verified by practice.
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