变厚煤层沿空留巷变形破坏原因及规律
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摘要
为揭示变厚煤层沿空留巷变形破坏原因及规律,理论分析了不同开采高度对沿空留巷的影响,并利用数值模拟分析了变厚煤层沿空留巷的围岩变形情况和应力分布规律。研究结果表明:煤层厚度增大,顶板下沉量增大,充填体所需支护阻力、充填宽度和回转角度增加,充填体变形破坏严重并向巷道内移,在巷道实体煤帮和帮角处产生应力集中,应力峰值向深部延伸。厚度较小时,巷道变形不显著,但实体煤帮应力集中,存在变形隐患。
To reveal the cause and law of the deformation and failure of the roadway along the goaf, the influence of different mining height on gob-side entry retaining is analyzed theoretically. The surrounding rock deformation and stress distribution of gob-side entry retaining of thickened coal seam are analyzed by numerical simulation. The results show that the thickness of the coal seam increases, the subsidence of the roof increases, the support resistance, the filling width and the angle of rotation are increased, the backfill body is seriously deformed and damaged and moves inward to the roadway, and the stress concentration occur at the solid coal and angle of the roadway, and the peak stress is extended to the deep part. When the thickness is small,the deformation of the roadway is not significant, but the stress of the solid coal side is concentrated, and there is a hidden danger of deformation.
To reveal the cause and law of the deformation and failure of the roadway along the goaf, the influence of different mining height on gob-side entry retaining is analyzed theoretically. The surrounding rock deformation and stress distribution of gob-side entry retaining of thickened coal seam are analyzed by numerical simulation. The results show that the thickness of the coal seam increases, the subsidence of the roof increases, the support resistance, the filling width and the angle of rotation are increased, the backfill body is seriously deformed and damaged and moves inward to the roadway, and the stress concentration occur at the solid coal and angle of the roadway, and the peak stress is extended to the deep part. When the thickness is small,the deformation of the roadway is not significant, but the stress of the solid coal side is concentrated, and there is a hidden danger of deformation.
引文
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[15]张东升,缪协兴,冯光明,等.综放沿空留巷充填体稳定性研究[J].中国矿业大学学报,2003,32(3):232.
[2]刘听成.无煤柱护巷的应用与进展[J].矿山压力与顶板管理,1994(4):2-10.
[3]张俊云.沿空留巷巷旁煤体作用机理及锚杆支护研究(下转第页)[D].西安:西安矿业学院,1998.
[4]丁焜,童有德.我国无煤柱开采的发展与展望(上)[J].煤矿设计,1984(3):11-16.
[5]谢文兵,殷少举,史振凡.综放沿空留巷几个关键问题的研究[J].煤炭学报,2004,29(2):146-149.
[6]杨德传.深部厚层复合顶板沿空留巷围岩变形机理及其控制研究[D].淮南:安徽理工大学,2013.
[7]付勇.缓倾斜中厚煤层沿空留巷合理支护研究[D].重庆:重庆大学,2010.
[8]张宇宁.大倾角中厚煤层沿空留巷理论及技术[D].重庆:重庆大学,2016.
[9]钱鸣高,缪协兴,许家林.岩层控制的关键层理论[M].徐州:中国矿业大学出版社,2003.
[10]钱鸣高,缪协兴,何富连.采场“砌体梁”结构的关键块分析[J].煤炭学报,1994(6):557-563.
[11]李学华.综放沿空掘巷围岩大小结构稳定性的研究[D].徐州:中国矿业大学,2000.
[12]周保精,徐金海,倪海敏.小宽高比充填体沿空留巷稳定性研究[J].煤炭学报,2010(8):33-37.
[13]陈炎光,陆士良.中国煤矿巷道围岩控制[M].北京:煤炭工业出版社,1994.
[14]钱鸣高,许家林,缪协兴.煤矿绿色开采技术[J].中国矿业大学学报,2003,32(4):343-349.
[15]张东升,缪协兴,冯光明,等.综放沿空留巷充填体稳定性研究[J].中国矿业大学学报,2003,32(3):232.