短壁连采工作面顶板运动规律研究
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摘要
为了防止顶板大面积来压对采场造成冲击、优化开采引起的应力分布,针对榆家梁煤矿薄基岩厚表土层的赋存特点,在42209短壁连采工作面采取顶板全垮落法开采技术,实现了对短壁开采顶板管理,提出了工艺极限回采面积与应力极限回采面积概念。结果表明,回采引起的超前支承压力走向与侧向应力集中系数分别为3.4和2.1,据实测工艺极限回采面积为1 500 m2,应力极限回采面积为15 000 m2,对顶板采用"人工强制放顶+小步距自然垮落"的全垮落控制模式可有效保证回采工艺安全。
In order to prevent the bumping occurred by the large area roof weighting and to optimize the stress distribution caused by the coal mining,according to the deposition features of the thin base rock and thick overburden in Yujialiang Mine,the coal mining technology with full roof falling method was adopted in No. 42209 shortwall continuous coal mining face,a conception of the technical limit mining area and the stress limit mining area were provided and roof control of the shortwall mining was realized. The results showed that the strike and side stress concentrated coefficients of the advance support pressure caused by the mining operation were 3. 4 and 2. 1 individually. According to the site measurements,the technical limit mining area was 1 500 m2and the stress limit mining area was 15 000 m2. The full roof falling control mode with artificial forced roof falling + short distance natural roof falling applied to the roof could effectively ensure the safety of the mining technology.
In order to prevent the bumping occurred by the large area roof weighting and to optimize the stress distribution caused by the coal mining,according to the deposition features of the thin base rock and thick overburden in Yujialiang Mine,the coal mining technology with full roof falling method was adopted in No. 42209 shortwall continuous coal mining face,a conception of the technical limit mining area and the stress limit mining area were provided and roof control of the shortwall mining was realized. The results showed that the strike and side stress concentrated coefficients of the advance support pressure caused by the mining operation were 3. 4 and 2. 1 individually. According to the site measurements,the technical limit mining area was 1 500 m2and the stress limit mining area was 15 000 m2. The full roof falling control mode with artificial forced roof falling + short distance natural roof falling applied to the roof could effectively ensure the safety of the mining technology.
引文
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[3]徐永圻.煤矿开采学[M].徐州:中国矿业大学出版社,2009.
[4]宋振骐.实用矿山压力与岩层控制[M].徐州:中国矿业大学出版社,1992.
[5]钱鸣高,石平五,许家林.矿山压力与岩层控制[M].徐州:中国矿业大学出版社,2010.
[6]钱鸣高,缪协兴.岩层控制的关键层理论[M].徐州:中国矿业大学出版社,2003.
[7]岩层控制中的关键层理论研究[J].煤炭学报,1996,21(3):225-230.
[8]梁运培,孙东玲.岩层移动的组合岩梁理论及其应用研究[J].岩石力学与工程学报,2002,21(5):654-657.
[9]史红,姜福兴.采场上覆大最度坚硬岩层破断规律的力学分析[J].岩石力学与工程学报,2004,23(18):3066-3069.
[10]李巍栋,王志强,高扬,等.厚煤层整层开采上覆关键层断裂条件判定[J].煤炭科学技术,2009,37(8):24-27.
[11]王国胜,高登彦.厚基岩浅埋煤层大采高工作面矿压显现规律分析[J].煤炭科学技术,2010,38(7):27-30.
[12]许家林,钱鸣高.关键层运动对覆岩及地表移动影响的研究[J].煤炭学报,2004,25(2):122-126.
[13]许家林,连国明,朱卫兵,等.深部开采覆岩关键层对地表沉陷的影响[J].煤炭学报,2007,37(7):686-690.