综采工作面回采巷道围岩破裂变形规律实测研究

周艳国; 韩猛

综采工作面回采巷道围岩破裂变形规律实测研究

周艳国,
韩猛

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出版历程
- 发布日期: 2019-05-19

Research on Actual Measurement of Surrounding Rock Fracture and Deformation Law of Mining Roadway in Fully Mechanized Working Face

摘要

摘要: 为了研究综采工作面回采巷道围岩变形规律,为回采巷道的保护提供合理依据,以东欢坨矿2088_下工作面为工程背景,运用现场实测方法,通过钻孔电视探测分析2088下回风巷道围岩破裂情况及对巷道进行位移监测并分析变形规律。结果表明:巷道顶板下位岩层中均存在较为严重的破裂区,破裂区范围约为2.0 m左右,2088_下工作面所在的8^#煤层巷道围岩属于中松动圈和大松动圈范围;未受采动影响区域内顶底板、两帮最大移近量仅为84、34 mm;超前影响范围约为90 m,顶底板、两帮最大移近量达到了1 280、1 869 mm,由此可见,在工作面回采扰动作用下巷道变形情况较为严重;回采工作面推进距离从测点前80 m至0 m过程中,顶底板、两帮移近量分别增大至243、206 mm,移近速度分别增大至19.1 mm/d和14.7 mm/d,均产生明显增长,说明回采工作面距测点越近,巷道受采动影响越大;在对回采巷道进行保护时, 要求巷道支架支护必须考虑能够有效支护该范围内岩层重量以及上覆岩层作用力。
- 综采工作面 /
- 回采巷道 /
- 覆岩破裂 /
- 围岩变形 /
- 超前影响
Abstract: To study the surrounding rock deformation law of mining roadway in fully mechanized mining face, and provide a reasonable basis for the protection of mining roadway, this paper takes the 2088 working face of Donghuantuo Mine as the engineering background, and uses the field measurement method to analyze 2088 lower air channel through borehole TV detection. The surrounding rock rupture of the roadway is analyzed by analyzing the displacement of the roadway. The results show that there are serious rupture zones in the lower rock stratum of the roadway. The rupture zone is about 2.0 m, and the roadway surrounding rock of 8^# coal seam at the lower 2088 working face belongs to the range of middle and large loose circles; the maximum displacement of the top and bottom plates and the two sides of roadway in the unaffected area is only 84 mm, 34 mm, and the advanced influence range is about 90 m, the maximum amount of the top and bottom plates and the two sides of roadway has reached to 1 280 mm and 1 869 mm. It can be seen that the deformation of the roadway under the disturbance of the working face is more serious. The distance of the working face is 80 m to 0 m before the measuring point, and the displacement of the top and bottom plates and the two sides of roadway are increased to 243 mm, 206 mm, the approach speed increased to 19.1 mm/d and 14.7 mm/d, respectively, both produced significant growth, indicating that the closer the mining face is from the measuring point, the larger the roadway is affected by the mining; when the mining roadway is protected, it is required that the roadway bracket support must be able to effectively support the rock mass and the overburden strata in this range.
- fully mechanized mining face /
- mining roadway /
- overburden rupture /
- surrounding rock deformation /
- advance impact

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