摘要
深井充填工作面矿压显现强度与地表沉陷变形控制效果受充填体强度、充填率、煤柱宽度及充填体与煤柱承载匹配等因素影响,合理的充填体与煤柱协同承载是实现深部煤炭资源绿色开采的关键。为揭示深井充填工作面充填体-煤柱协同承载效应,结合义能煤矿地质生产条件,构建充填体-煤柱承载结构力学模型,探究充填体与围岩相互作用特征、充填体与煤柱协同承载作用过程。采用PFC软件模拟计算“充填体-煤柱”在不同充填率、充填强度条件下的承载特点,揭示超高水充填工作面充填体-煤柱应力分布及覆岩裂隙发育规律。研究结果表明:当超高水充填料充填率超过90%、水灰比低于95%时,煤柱应力集中程度较低,能够保持较好稳定性,顶板破断仅发展至基本顶,充填体-煤柱协同承载有效降低了工作面矿压显现强度与覆岩运移范围,为实现深部煤层绿色开采提供了科学依据。
Both the strength of mine pressure behavior of the backfilling face in deep coal mines and the effect of subsidence deformation control in the earth’s surface are affected by such factors as backfilling body strength,backfilling rate,coal pillar width and the matching degree between backfilling body and bearing capacity of coal pillar.The collaboration of a reasonable backfilling body and coal pillar is key to realize green mining of deep coal seams.To uncover the synergistic bearing effect of backfilling body and coal pillar in the deep coal mines,based on the engineering geological conditions of Yineng Coal Mine,mechanical model of the backfilling body-coal pillar bearing structure has been constructed and the interactions between backfilling body and surrounding rock and the mechanical process of the backfilling body-coal pillar bearing structure have been explored.Under different rates and strengths of backfilling,the backfilling body-coal pillar bearing characteristics have been studied through PFC(Particle Flow Code),which has revealed the stress distribution of the backfilling body and coal pillar and the law of overlaying strata fracture development on the face of super high-water materials.The results have shown that when the backfilling rate of super high-water backfilling body is above 90%and the water-cement ratio is below 95%,the coal pillar has a lower stress distribution and maintains a better stability.The synergistic bearing of backfilling body and coal pillar effectively reduces the strength of mine pressure behavior of the backfilling face and the movement range of the overlying strata,providing a scientific basis for the green mining of the deep coal seams.
作者
王方田
李岗
班建光
彭新宁
李少涛
刘士法
WANG Fangtian;LI Gang;BAN Jianguang;PENG Xinning;LI Shaotao;LIU Shifa(School of Mines,Key Laboratory of Deep Coal Resource Mining,Ministry of Education,China University of Mining&Technology,Xuzhou,Jiangsu 221116,China;Henan Pingbao Coal Industry Co Ltd,Pingdingshan,Henan 461700,China;Shandong Yulong Mining Group Co Ltd,Jining,Shandong 272500,China;Shandong Yineng Coal Industry Co Ltd,Jining,Shandong 272500,China)
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2020年第2期311-318,共8页
Journal of Mining & Safety Engineering
基金
国家重点研发计划项目(2018YFC0604701)
国家自然科学基金项目(51974297)
中国博士后科学基金项目(2018M630634)
学科前沿科学研究专项项目(2019XKQYMS50)。
关键词
充填开采
深部煤层
充填体-煤柱
协同承载
安全高效绿色开采
backfilling mining
deep coal seam
backfilling body and coal pillar
synergistic bearing
safe
efficient and green mining
