摘要
近水平特厚煤层开采的覆岩移动变形大,对地层移动和瓦斯运移影响较大。利用相似模拟试验方法,研究了在开采过程中覆岩的移动规律。通过建立150∶1的模型,模拟了塔山煤矿3-5#煤层开采过程中上覆岩层垮落和裂隙的发育规律。结果表明,3-5#煤层顶板的最大下沉量达14.3 m,煤层开采后的遗留空间较大,垮落的块状结构无法填充整个采空区,覆岩最大下沉速度达5.2 m/d,下沉速度经历了“缓慢—逐渐增大到峰值—快速减少—趋于稳定”的过程,且最大裂隙发育高度达160 m左右,远大于薄煤层开采,相关研究结果可以为具有类似条件的特厚煤层开采提供借鉴。
Movement and deformation of overlying strata caused by horizontal extra-thick coal seam mining were large,which had great influence on strata movement and gas migration.In this paper,overlying strata's movement rule during mining was studied by similar simulation experiment.A 150:1 ratio model was established to simulate the caving and fracture development rules of the overlying strata during the mining process of 3-5#coal seam in Tashan Coal Mine.The results showed that the maximum subsidence of roof of 3-5#coal seam was up to 14.3 m,the space left after coal mining was large,the caved block structure could not fill the whole gob,and the maximum subsidence rate was up to 5.2 m/d,and the subsidence rate had experienced the process of"slowing,gradually increasing to the peak value,rapidly decreasing and tending to be stable",and the maximum fracture development height was about 160 m,which was much higher than that of thin seam mining.The relevant research results could provide reference for the mining of extra thick seam with similar conditions.
作者
赵鹏远
朱传杰
翁旭泽
戚绪尧
刘谦
任洁
胡思佳
刘娜
周靖轩
Zhao Pengyuan;Zhu Chuanjie;Weng Xuze;Qi Xuyao;Liu Qian;Ren Jie;Hu Sijia;Liu Na;Zhou Jingxuan(School of Safety Engineering,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;Datang Tashan Coal Mine Co.Ltd.,Datong Coal Mine Group,Datong,Shanxi 037000,China;School of Resource Engineering,Longyan University,Longyan,Fujian 364012,China)
出处
《中国煤炭》
2019年第11期98-106,共9页
China Coal
基金
国家自然科学基金(51874293,11531010)
国家重点研发计划(2018YFC0807905)
关键词
特厚煤层
放顶煤开采
覆岩移动
采动裂隙
相似模拟
extra-thick coal seam
top-coal caving mining
strata movement
mining-induced fractures
similar simulation
