China Energy Shendong Coal Group Co., Ltd.
Key Laboratory of Western Mine Exploitation and Hazard Prevention, Ministry of Education,Xi’an University of Science and Technology
Shigetai Coal Mine, China Energy Shendong Coal Group Co., Ltd.

浅埋近距离煤层工作面过平行煤柱开采容易发生强矿压压架事故,严重影响工作面安全高效开采。以榆家梁煤矿43207工作面和石圪台煤矿2-2上102及2-2上103工作面为背景,采用理论分析、物理模拟和现场实测相结合的方法,根据间隔岩层厚度和煤柱应力传递影响角,提出了过煤柱阶段划分判据,重点分析了不同间采比G、水力压裂程度条件下,过平行煤柱不同阶段的矿压显现特征。结果表明:由于上覆遗留煤柱及倒梯形覆岩结构的作用,导致煤柱影响阶段来压时支架平均载荷最大,进煤柱阶段次之,出煤柱阶段最小,强矿压位置主要集中在出煤柱影响阶段范围;间采比越小,工作面过煤柱采动期间来压时支架平均载荷越大,间采比G=5.5较G=10在进煤柱阶段、煤柱影响阶段和出煤柱阶段分别增大14.6%、14.2%和23.5%,动载效应越明显;间采比对周期来压步距影响不大,总体上煤柱影响阶段的周期来压步距是进出煤柱阶段的1.6~2倍,周期来压步距越大造成顶板悬伸长度增大,导致工作面来压时支架载荷明显。根据过煤柱阶段不同水力压裂范围的矿压规律分析,压裂后的支架平均载荷较未压裂减小11.2%~15%,来压步距减小7.8%~20.3%,水力压裂效果较明显,可有效地降低工作面过煤柱采动的强矿压风险,为类似开采条件的强矿压控制提供借鉴意义。

Strong mine pressure and support accidents are prone to occur in the mining process of par- allel coal pillars in shallow buried close distance coal seam, which seriously affects the safe and effi- cient mining of the working face. Taking the 43207 working face of Yujialiang coal mine and the 2 102 and 2- 2 up103 working faces of Shigetai coal mine as the background, the method of combining the- oretical analysis, physical simulation and field measurement analysis was adopted. According to the thickness of interval strata and the influence angle of coal pillar stress transfer, the criterion of stage di- vision through the coal pillar was put forward. The distribution characteristics of support working resist- ance in different stages of working face passing through parallel coal pillars under different inter-mining ratios G and hydraulic fracturing degree were analyzed. The results show that: due to the effect of coal pillar and inverted trapezoidal overburden structure, the average load of the support is the largest in the influence stage of the coal pillar, the second in the stage of entering the coal pillar, and the smallest in the stage of outing the coal pillar. The position of strong mine pressure is mainly concentrated in the in- fluence stage of coal pillar. The smaller the inter-mining ratio G, the greater the average working resist- ance when the working face is weighting during the mining stage of coal pillar. The ratio G = 5. 5 is 14. 6% , 14. 2% and 23. 5% higher than G = 10 in the stage of entering the coal pillar, influence stage and outing stage, and the dynamic load effect is more obvious. The inter-mining ratio has little effect on the periodic weighting intervals, in general, the periodic weighting interval in the influence stage of the coal pillar is 1. 6 ~ 2 times that of the other stages of coal pillar. The larger the periodic weighting inter- val, the larger the roof overhang length, which causes the obvious support load when the working face is weighting. According to the analysis of the mine pressure law of different hydraulic fracturing ranges in the coal pillar stage, the average load of the support after fracturing is reduced by 11. 2% ~ 15% com- pared with that without fracturing, and the weighting interval is reduced by 7. 8% ~ 20. 3% . The effect of hydraulic fracturing is obvious, which effectively reduces the strong mine pressure risk of pillar min- ing. It provides reference for strong control under similar mining.mine pressure

国家自然科学基金项目(52074211,52304153)第一作者:孟永兵,男,内蒙古乌兰察布人,高级工程师,E-mail:10022529@aceic.com

孟永兵,黄庆享,贺雁鹏,等.浅埋近距离煤层工作面过平行煤柱开采强矿压显现规律[J].西安科技大学学报,2024,44(2):245-255.

MENG Yongbin, HUANG Qingxiang, HE Yanpeng, et al. Manifestation law of strong mine pressure in shallow-buried close-range coalseam working face through parallel coal pillar mining[ J] . Journal of Xi’an University of Science and Technology, 2024, 44( 2) : 245-255.