Pumping pillar technology of fully mechanized caving face passing through abandoned roadway
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摘要: 针对现有工作面过空巷基于传统支护方法，不能较好地适应多变的地质条件的问题，以大同煤矿集团永定庄煤业有限责任公司8103综放工作面为研究背景，通过理论分析综放工作面过空巷基本顶变形特征，提出了综放工作面过空巷泵送支柱技术。数值模拟结果表明，随着工作面距空巷距离减小,利用泵送支柱支护的空巷围岩垂直应力呈“双峰”-“孤峰”-“双峰”变化，围岩移近量先增大、后趋于稳定，说明泵送支柱能够承受工作面超前支承应力，保证工作面安全通过空巷。该技术在现场得到成功应用，空巷顶底板最大移近量为282 mm，两帮最大移近量为152 mm，围岩稳定性较好。Abstract: Existing working face passing through abandoned roadway based on traditional support methods cannot adapt to changeable geological conditions well. Based on research background of 8103 fully mechanized caving face of Yongdingzhuang Coal Industry Co., Ltd. of Datong Coal Mine Group, basic roof deformation characteristics of the fully mechanized caving face passing through abandoned roadway were analyzed theoretically, and pumping pillar technology of fully mechanized caving face passing through abandoned roadway was put forward. The numerical simulation results show that with distance decreasing between working face and abandoned roadway, vertical stress of surrounding rock in abandoned roadway supported by pumping pillar changes from "double peak" to "single peak" and then "double peak", and convergence of surrounding rock increases firstly and then tends to be stable, which indicate that the pumping pillar can withstand advancing abutment stress of the face and ensure safety of the face passing through abandoned roadway. The technology has been successfully applied in field with good stability of surrounding rock. The maximum convergence between roof and floor is 282 mm, and that between two side walls is 152 mm.
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