特厚煤层工作面过空巷强力墩柱支护技术研究及应用  

Strong pier support technology for working face passing empty roadway in extra-thick coal seam

作　　者：田锦州 TIAN Jin-zhou(CCTEG Mining Research Institute Co.,Ltd.,Beijing 100013,China;Mining Design Division,Tiandi Science and Technology Co.,Ltd.,Beijing 100013,China;Mining Research Institute of China Coal Research Institute,Beijing 100013,China)

机构地区：[1]中煤科工开采研究院有限公司,北京100013 [2]天地科技股份有限公司开采设计事业部,北京100013 [3]煤炭科学研究总院开采研究分院,北京100013

出　　处：《煤炭工程》2021年第12期45-48,共4页Coal Engineering

基　　金：国家重点研发计划资助项目(2017YFC0804305-1)。

摘　　要：为了保证特厚煤层工作面安全、高效地通过空巷,对空巷采用了强力墩柱支护技术。运用数值模拟、实验室实验及现场工业应用相结合的方法对工作面推进过程中空巷围岩的应力变化、墩柱受力变形情况等进行了研究,结果表明:由于墩柱的支撑作用,工作面超前支承应力与空巷应力形成叠加的应力范围明显变小,工作面与空巷间煤柱内承受的应力明显降低,墩柱则承受了较大的压应力,临近贯通前空巷顶板未出现明显的塑性破坏区;大比例墩柱的单轴压缩实验结果显示其最大承载能力可达8400kN,最大压缩量可达156mm,由于套管的约束作用,墩柱破坏后都保持了较大的残余强度;现场工业应用表明,强力墩柱的最大受力可达7000kN,破坏后的残余强度可维持在3000kN以上。In order to ensure the safety and efficiency during working face passing empty roadway in extra-thick coal seam,the strong pier support technology is adopted.The stress change of surrounding rock and the deformation of pier during working face advancement are studied with numerical simulation,laboratory test and field industrial application.The results show that:due to the support of pier column,the stress range of superposition of advance supporting stress and gob stress in working face becomes obviously smaller,the stress in the coal pillar between the working face and the empty roadway is obviously reduced,while the pier pillar bears a large compressive stress,and there is no obvious plastic failure zone in the roof of the empty roadway before cut-through.The results of uniaxial compression test of large-scale pier show that the maximum bearing capacity reaches 8400kN and the maximum compression reaches 156mm.Field application shows that the maximum stress of the strong pier is 7000kN,and the residual strength after failure can be maintained above 3000kN.

关 键 词：特厚煤层 工作面 过空巷 强力墩柱 承载能力 残余强度 

分 类 号：TD353[矿业工程—矿井建设]