特厚煤层残留煤柱应力分布与巷道跨煤柱布控技术  

Remnant coal pillar stress distribution and cross-pillar roadway layout control technology in extra-thick coal seam

作　　者：王鹏 王志强[2,3] 洛锋[1] 苏越 李敬凯 武超 张智尧 WANG Peng;WANG Zhiqiang;LUO Feng;SU Yue;LI Jingkai;WU Chao;ZHANG Zhiyao(College of Mining and Geomatics Engineering,Hebei University of Engineering,Handan 056038,China;China and Russia Dynamics Research Center,China University of Mining and Technology-Beijing,Beijing 100083,China;School of Energy and Mining Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China;China Coal International Engineering Design and Research Institute,Beijing 100120,China)

机构地区：[1]河北工程大学矿业与测绘工程学院,河北邯郸056038 [2]中国矿业大学(北京)中俄动力学研究中心,北京100083 [3]中国矿业大学(北京)能源与矿业学院,北京100083 [4]中煤国际工程设计研究总院有限公司,北京100120

出　　处：《煤炭科学技术》2023年第12期232-242,共11页Coal Science and Technology

基　　金：国家自然科学基金面上资助项目(52074291);河北省自然科学基金资助项目(E2020402048);大学生创新训练资助项目(X202310076072)。

摘　　要：为确定老公营子煤矿特厚煤层分层开采残留煤柱影响下回采巷道的合理布置位置及稳定控制方案,采用现场监测、理论分析与数值模拟结合的方法,研究了残留煤柱与下分层煤体应力分布特征,对比分析了不同巷道布置位置的围岩应力状态,提出了跨残留煤柱巷道布置方式,建立了以应力增高区宽度作为条形基础宽度的底板滑移线场力学模型,确定了距残留煤柱水平距离4 m的巷道布置方案,结合巷道布置特点,提出了“工字钢棚+锚索+喷浆+浅孔低压注浆”的主被动联合支护方案。研究结果表明,上分层两侧工作面采空后,主应力偏转导致残留煤柱与下分层煤体间均存在双峰值的应力集中现象,煤柱内部为垂直应力集中区,煤柱边缘为剪应力集中区;外错式布置巷道受垂直应力与剪应力双重影响,应力集中程度最高且随外错距离增大而增大,垂直式布置巷道应力集中程度次之,受剪应力影响更为明显,而跨残留煤柱布置巷道受垂直应力与剪应力影响明显降低,垂直应力峰值稳定为34.1 MPa,剪应力峰值稳定为6.7 MPa,应力集中程度最低且随跨距增大而减小。现场应用效果显示,跨残留煤柱巷道围岩变形量小,无强烈的矿压显现特征,能够满足安全生产的要求。The paper aims to determine the reasonable layout and stability control scheme of the mining roadway under the influence of remnant coal pillars in the multi-slice longwall mining of the extra thick coal seam in Laogong Yingzi Coal Mine.Combining field monit-oring,theoretical analysis and numerical simulation,the stress distribution characteristics of the remnant coal pillar and the coal in the lower slice are studied to compare and analyze the stress states of the surrounding rock of roadways at different locations,the roadway lay-out across the remnant coal pillar is proposed,and a mechanical model of the floor slip line field is established.The model takes the width of the stress increasing area as the width of the bar-shaped foundation,the roadway layout scheme of 4 m horizontal distance from the rem-nant coal pillar iss determined.Combining with the roadway layout characteristics,the active and passive combined support scheme of“I-beam steel sets+cable bolts+shotcrete+shallow hole low-pressure grouting”is proposed.The results show that there is a double peak stress concentration both within the remnant coal pillar and the lower coal slice after mining on both sides of the upper slice.Inside the coal pillar is the vertical stress concentration zone,and at the edge of the coal pillar is the shear stress concentration zone.External spaced overlapped roadway is influenced both by vertical and shear stresses.The stress concentration of external spaced overlapped roadway is the highest followed by vertical overlapped roadway and increases with the increase of the outer staggered distance.The influence of the shear stress is more obvious for vertical overlapped roadway.The influence of the vertical stress and shear stress on the roadway layout across the remnant coal pillar is significantly reduced,and the peak value of the vertical stress stabilizes at 34.1 MPa.The peak shear stress stabilizes at 6.7 MPa,and the stress concentration is the lowest and decreases with the increase of the interval of the two roadw

关 键 词：特厚煤层 分层开采 残留煤柱 滑移线场 跨煤柱 联合支护 

分 类 号：TD322[矿业工程—矿井建设]