陈祥祺, 李化敏, 王伸,等.特厚煤层综放工作面变宽煤柱段巷道掘进期间围岩矿压显现特征分析[J].河南理工大学学报（自然科学版）,2020,39(2):1-7.

CHEN X Q, LI H M, WANG S,et al.Analysis of mine pressure behavior characteristics in the period of gateway exca-vation of variable width coal pillar in fully mechanized caving face in extra-thickcoal seam[J].Journal of Henan Polytechnic University(Natural Science) ,2020,39(2):1-7.

特厚煤层综放工作面变宽煤柱段巷道掘进期间围岩矿压显现特征分析

陈祥祺, 李化敏, 王伸, 王祖洸

河南理工大学 能源科学与工程学院，河南焦作454000

摘要:为了掌握大同煤矿集团有限责任公司塔山煤矿特厚煤层综放工作面变宽煤柱段巷道掘进期间围岩变形破坏特征，采用现场实测、数值模拟及理论分析方法，分析了变宽煤柱段巷道掘进期间围岩矿压显现规律，研究了变宽煤柱段巷道围岩应力场及煤岩体能量分布特征，揭示了特厚煤层变宽煤柱段巷道掘进期间巷道矿压显现机理。研究表明：特厚煤层变宽煤柱段巷道掘进期间伴随有声响、震动、冒顶、片帮等强矿压现象，主要发生在煤柱宽度22.4 ~47.9 m 段；侧向应力及煤体能量集中分布于距采空区边缘30~40 m处，呈“带”状分布，随着煤柱宽度的增大，巷道围岩侧向应力及围岩积聚的能量曲线表现出先增后减的趋势，在煤柱宽度约 35 m时应力和能量均达到最大值，分别为24.27 MPa和7. 29 × 10⁵ J；巷道掘进使砌体梁结构的力学平衡状态受到破坏，引起围岩应力的快速动态调整，当煤岩体中的静载荷与采掘活动引起的动载荷叠加值超过煤岩体的承载极限时，煤体中集聚的大量弹性应变能以动能形式释放从而引起巷道矿压显现。

关键词:特厚煤层;综放工作面;变宽煤柱;掘进巷道;矿压显现特征

doi:10.16186/j.cnki.1673-9787.2020.2.1

基金项目:国家重点研发计划项目（2018YFC0604502）

收稿日期:2019/05/09

修回日期:2019/06/18

出版日期:2020/03/15

Analysis of mine pressure behavior characteristics in the period of gateway exca-vation of variable width coal pillar in fully mechanized caving face in extra-thickcoal seam

CHEN Xiangqi, LI Huamin, WANG Shen, WANG Zuguang

School of Energy Science and Engineering， Henan Polytechnic University ，Jiaozuo 454000 ， Henan， China

Abstract:In order to study the deformation and failure characteristics of surrounding rock in fully mechanized caving face with variable width coal pillar during gateway excavation in extra-thick coal seam of Tashan coal mine， Datong Coal MIne Group Co. Ltd. ， the field measurement， numerical calculation and theoretical analysis method were used to analyze the law of mine pressure behaviors of surrounding rock during gateway excavation in variable width coal pillar. The surrounding rock stress field and the energy distribution characteristics of coal-rock mass under the condition of widening coal pillar retaining roadway were studied， and the mechanism of mine pressure behaviors during the gateway excavation of variable width coal pillar in extra-thick coal seam was obtained. The research showed that there were strong rock pressure phenomena such as sound， vibration， roof fall and rib spalling during roadway excavation with variable width pillar in extra-thick coal seam. It mainly occured in the period of coal breaking and driving within the range of coal pillar width from 22.4 m to 47.9 m. The lateral stress and the coal body energy were concentrated in the range of the edge of the goaf from 30 mto 40 m ， and were distributed in a belt shape. With the width of the coal pillar increased， the surrounding rock side of the gateway increased. The energy curves of stress and surrounding rock showed a trend of first increasing and then decreasing. When the width of the coal pillar was about 35 m， the lateral stress and the coal body energy reached the maximum of 24. 27 MPa and 7. 29 × 10⁵ J， respectively. The equilibrium state of mechanics of beam structure was destroyed， which caused rapid dynamic adjustment of surrounding rock stress. When the static load in the coal-rock mass was superimposed on the dynamic load caused by the mining activity and exceeded the bearing limit of the coal-rock mass， a large amount of elastic strain energy accumulated in the coal body was released in the form of kinetic energy， thus the mine pressure behaviors of gateway appeared.

Key words:extra-thick coal seam;fully mechanized caving face;variable width coal pillar;excavation gateway;mine pressure behavior characteristic

特厚煤层综放工作面变宽煤柱段巷道掘进期间围岩矿压显现特征分析_陈祥祺.pdf