缓斜煤层拱形沿空巷道煤柱设计及控制  

Width design of narrow coal pillar of gob-side entry driving in gently inclined coal seam and its control technology

作　　者：吴国桥 李磊[2,3] 王红胜[2,3] 李树刚[4] 朱广安 WU Guo-qiao;LI Lei;WANG Hong-sheng;LI Shu-gang;ZHU Guang-an(Weijiadi Coal Mine,Gansu Jingyuan Coal Industry & Electricity Power Co. ,Ltd. ,Pingchuang 730923,China;College of Energy Science and Engineering,Xi’an University of Science and Technology,Xi’an 710054,China;Institute of Rock Burst Prevention and Control,Xi’an University of Science and Technology,Xi’an 710054,China;College of Safety Science and Engineering,Xi’an University of Science and Technology,Xi’an 710054,China)

机构地区：[1]甘肃靖远煤电股份有限公司魏家地煤矿,甘肃平川730923 [2]西安科技大学能源学院,陕西西安710054 [3]西安科技大学冲击地压防治研究所,陕西西安710054 [4]西安科技大学安全科学与工程学院,陕西西安710054

出　　处：《西安科技大学学报》2020年第4期621-628,共8页Journal of Xi’an University of Science and Technology

基　　金：国家自然科学基金(51974231,51904235);国家重点基础研究计划(973计划)(2015CB251600);中国博士后科学基金(2018M643692);陕西省自然科学基础研究计划(2019JQ-487)。

摘　　要：针对缓斜煤层沿空巷道偏载应力作用,两帮煤体呈现非对称大变形、破坏,巷道维护困难的问题,以魏家地煤矿2303工作面运输巷为工程背景,采用理论分析、数值分析并结合现场实践的方法,确定煤柱合理宽度并揭示倾斜煤层沿空掘巷围岩控制机理。结果表明:基于应力极限平衡及广义H-B强度破坏准则确定的煤柱塑性区宽度是个变化值,开挖扰动权重参数在0~1之间变化,煤柱塑性区宽度范围为8.1~8.5 m,结合数值分析结果,最终确定煤柱合理宽度为5.0 m.提出煤柱帮中部近水平位移为零区域(承压区)短锚索支护、实体煤侧压剪破坏严重区域(深度达6~7 m)高强度锚索支护的高预应力让压控制技术。巷道掘进期间两帮移近量为160 mm,顶板下沉量为65 mm,只需起底一次,围岩控制效果良好。Due to the eccentric load stress along the empty roadway in gently inclined coal seams,the two coal bodies exhibit asymmetric large deformation and failure,and the maintenance of the roadway is difficult.Taking the transportation roadway in No.2303 working face of Weijiadi Coal Mine as the engineering background,theoretical and numerical analysis are adopted with on-site practice methods in view,the reasonable width of coal pillars is determined and the control mechanism is revealed of surrounding rock along the gob in the inclined coal seam is revealed.The results show that the width of the coal pillar plastic zone determined based on the stress limit equilibrium and the generalized HB strength failure criterion is a variable value,and the excavation disturbance weight parameter varies between 0~1,and the coal pillar plastic zone width ranges from 8.1 to 8.5 m;the reasonable width of coal pillar is determined 5.0 m considering the results of numerical analysis.It is proposed that the near horizontal displacement in the middle of the coal pillars is near zero(pressure area)with short anchor cable support,and the solid coal side is severely damaged by compressive shearing(depth is 6~7 m)technology.During tunnel excavation,the distance between the two gangs is 160 mm,and the sinking amount of the roof is 65 mm.It only needs to lift the bottom once,and the surrounding rock control effect is good.

关 键 词：缓斜煤层 沿空掘巷 煤柱 承压区 

分 类 号：TD353.6[矿业工程—矿井建设]