采动覆岩裂隙动态演化规律的三维模拟
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摘要
以新景矿3213工作面为背景,基于非连续介质的离散元方法,对工作面回采过程中覆岩运移和裂隙演化规律进行了三维全过程数值模拟。研究结果表明:覆岩的裂隙富集区形态、大小范围会随着工作面的推进发生变化;在工作面推进初期呈"拱形"形态,当推进到80 m时,由于采空区中部裂隙逐渐压实而呈"中部镂空的圆拱型"形态,开采完成后则成"圆环状"形态;且在此"圆环"中不同位置的裂隙富集区大小也存在一定差异,在采空区倾向两端的裂隙富集区形态近似相同,而沿工作面走向,工作面上方裂隙富集区的宽度和高度略大于开切眼处。
Based on the discrete element method of discontinuous media, the whole process analysis of overlying stratum migration and fracture evolution in coal mining process of 3213 face of Xinjing Mine is carried out by using 3D numerical simulation software. The results show that the shape and size of fractured enrichment area of overburden rock will change with the advancing of working face. At the initial stage of working face advancing, it takes on the shape of "arch". When working face advances to80 m, it takes on the shape of "hollow circular arch"due to the gradual compaction of the central fissure in the goaf, and becomes"circular ring"after the mining is completed, and there are some differences in the size of the fracture enrichment zones at different positions in the "circle". The morphology of the fracture enrichment area at both ends of the goaf tendency is approximately the same, and along the mining direction, the width and height of the fissure enrichment area above the working face is slightly larger than the open-off cut.
Based on the discrete element method of discontinuous media, the whole process analysis of overlying stratum migration and fracture evolution in coal mining process of 3213 face of Xinjing Mine is carried out by using 3D numerical simulation software. The results show that the shape and size of fractured enrichment area of overburden rock will change with the advancing of working face. At the initial stage of working face advancing, it takes on the shape of "arch". When working face advances to80 m, it takes on the shape of "hollow circular arch"due to the gradual compaction of the central fissure in the goaf, and becomes"circular ring"after the mining is completed, and there are some differences in the size of the fracture enrichment zones at different positions in the "circle". The morphology of the fracture enrichment area at both ends of the goaf tendency is approximately the same, and along the mining direction, the width and height of the fissure enrichment area above the working face is slightly larger than the open-off cut.
引文
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[10]吴仁伦,王亚飞,徐东亮,等.工作面面宽对煤层群开采瓦斯卸压运移“三带”范围的影响[J].采矿与安全工程学报,2017,34(1):192-198.
[11]朱训国,夏洪春,王忠昶.煤层开采过程中覆岩移动规律的UDEC数值模拟[J].辽宁工程技术大学学报(自然科学版),2016,35(12):1402-1410.
[12]许满贵,魏攀,李树刚,等.“三软”煤层综采工作面覆岩运移和裂隙演化规律实验研究[J].煤炭学报,2017,42(S1):122-127.
[13]高喜才,伍永平,曹沛沛,等.大倾角煤层变角度综放工作面开采覆岩运移规律[J].采矿与安全工程学报,2016,33(3):381-386.
[14]乔小龙.大采高综放开采覆岩破坏特征和裂隙演化规律[J].工程地质学报,2017,25(3):858-866.
[15]孙波,张向阳,涂敏.深井大采高综采面矿压显现及覆岩破断规律研究[J].中国安全生产科学技术,2018,14(2):119-125.
[2]刘泽功,袁亮,戴广龙,等.开采煤层顶板环形裂隙圈内走向长钻孔法抽放瓦斯研究[J].中国工程科学,2004,6(5):32-38.
[3]袁亮,郭华,沈宝堂,等.低透气性煤层群煤与瓦斯共采中的高位环形裂隙体[J].煤炭学报,2011,36(3):357-365.
[4]林海飞,李树刚,成连华,等.覆岩采动裂隙带动态演化模型的实验分析[J].采矿与安全工程学报,2011,28(2):298-303.
[5]林海飞,李树刚,赵鹏翔,等.我国煤矿覆岩采动裂隙带卸压瓦斯抽采技术研究进展[J].煤炭科学技术,2018,46(1):28-35.
[6]李树刚,丁洋,安朝峰,等.近距离煤层重复采动覆岩裂隙形态及其演化规律实验研究[J].采矿与安全工程学报,2016(5):904-910.
[7]李树刚,林海飞,赵鹏翔,等.采动裂隙椭抛带动态演化及煤与甲烷共采[J].煤炭学报,2014,39(8):1455.
[8]李树刚,石平五,钱鸣高.覆岩采动裂隙椭抛带动态分布特征研究[J].采矿与安全工程学报,1999(3):44.
[9]吴仁伦,王继林,折志龙,等.煤层采高对采动覆岩瓦斯卸压运移“三带”范围的影响[J].采矿与安全工程学报,2017,34(6):1223-1231.
[10]吴仁伦,王亚飞,徐东亮,等.工作面面宽对煤层群开采瓦斯卸压运移“三带”范围的影响[J].采矿与安全工程学报,2017,34(1):192-198.
[11]朱训国,夏洪春,王忠昶.煤层开采过程中覆岩移动规律的UDEC数值模拟[J].辽宁工程技术大学学报(自然科学版),2016,35(12):1402-1410.
[12]许满贵,魏攀,李树刚,等.“三软”煤层综采工作面覆岩运移和裂隙演化规律实验研究[J].煤炭学报,2017,42(S1):122-127.
[13]高喜才,伍永平,曹沛沛,等.大倾角煤层变角度综放工作面开采覆岩运移规律[J].采矿与安全工程学报,2016,33(3):381-386.
[14]乔小龙.大采高综放开采覆岩破坏特征和裂隙演化规律[J].工程地质学报,2017,25(3):858-866.
[15]孙波,张向阳,涂敏.深井大采高综采面矿压显现及覆岩破断规律研究[J].中国安全生产科学技术,2018,14(2):119-125.