摘要
为了解决渭北澄合矿区中深部煤层复杂地质条件下工作面面间留设大宽度煤柱导致煤炭资源回采率低的难题,以西卓煤矿1509工作面为研究原型,通过理论计算、数值模拟及现场工业性试验的分析方法,对煤柱两侧塑性区分布特征及煤柱合理宽度留设问题进行研究。分别采用极限平衡理论对巷道侧煤柱塑性区宽度和断裂力学Ⅰ-Ⅱ复合型裂纹模型对采空区侧煤柱塑性区宽度进行分析,可以得出煤柱合理宽度的理论计算方法。采用FLAC^(3D)数值模拟对不同煤柱宽度条件下垂直应力分布规律和塑性区分布特征进行分析,结果表明,随着煤柱宽度的不断加大,煤柱内垂直应力峰值位置逐渐向采空区侧靠近;当煤柱宽度为15 m时,煤柱内垂直应力峰值为12.8 MPa,并且呈对称性分布,塑性区并未贯穿整个煤柱区域,煤柱具有稳定的承载能力。通过理论分析和数值模拟计算得到的煤柱宽度基本一致,采用现场工业性试验确定,西卓煤矿1509工作面与1511工作面进风巷道留设15 m煤柱宽度可以满足矿井正常生产需要,研究成果可为澄合矿区中深部煤层相似地质条件下煤柱宽度留设提供参考。
In order to solve the problem of low coal resource recovery rate caused by the large coal pillar width left between the working faces under the complex geological conditions of the middle and deep coal seams in the Weibei Chenghe mining area,taking the 1509 working face of Xizhuo Coal Mine as the research prototype,through the analysis methods of theoretical calculation,numerical simulation and on-site industrial tests,the distribution characteristics of the plastic zone on both sides of the coal pillar and the problem of the reasonable width left of the coal pillar were studied.The width of the plastic zone of the coal pillar on the side of the roadway was analyzed respectively by using the limit equilibrium theory and the composite crack model of fracture mechanicsⅠ-Ⅱon the width of the plastic zone of the coal pillar on the side of the goaf.Thus,the calculation method for the reasonable width of the coal pillar can be theoretically obtained.The distribution characteristics of vertical stress and plastic zone under different coal pillar widths were analyzed by FLAC^(3D) numerical simulation.The results show that as the width of the coal pillar continuously increases,the peak position of vertical stress in the coal pillar gradually approaches the goaf side.When the width of the coal column is 15 m,the peak vertical stress within the coal column is 12.8 MPa and is distributed symmetrically.The plastic zone does not run through the entire coal column area,and the coal column has a stable bearing capacity.The coal pillar widths obtained through theoretical analysis and numerical simulation calculation are basically the same.Through on-site industrial tests,it is determined that leaving a 15 meter coal pillar width in the air intake roadways of the 1509 and 1511 working faces of Xizhuo Coal Mine can meet the normal production needs of the mine.The research results provide a new reference for the setting of coal pillar widths under similar geological conditions of middle and deep coal seams in the Chenghe mining area.
作者
刘英锋
LIU Yingfeng(CCTEG Xi’an Research Institute(Group)Co.,Ltd.,Xi’an,Shaanxi 710077,China;Key Laboratory of Coal Mine Water Hazard Prevention and Control Technology in Shaanxi Provinc,Xi’an,Shaanxi 710077,China)
出处
《中国煤炭》
北大核心
2025年第12期92-101,共10页
China Coal
基金
国家重点研发计划项目(2023YFF1306002)
陕西省自然科学基础研究计划重点资助项目(2023-C-ZD-27)。
关键词
澄合矿区
中深部煤层
Ⅰ-Ⅱ复合型裂纹
塑性区分布
煤柱宽度
Chenghe mining area
middle-deep coal seam
Ⅰ-Ⅱcompound crack
plastic zone distribution
coal pillar width
