深部厚煤层动静载荷下区段煤柱损伤演化分析  

Damage evolution analysis of section coal pillar under dynamic and static load in deep thick coal seam

作　　者：雷照源[1,2,4] 李团结 崔峰 郭超奇[4] 易瑞强 LEI Zhaoyuan;LI Tuanjie;CUI Feng;GUO Chaoqi;YI Ruiqiang(College of Energy Science and Engineering,Xi’an University of Science and Technology,Xi’an 710054,China;Key Laboratory of Western Mine Exploitation and Hazard Prevention,Ministry of Education,Xi’an University of Science and Technology,Xi’an 710054,China;Key Laboratory of Coal Resource Exploration and Comprehensive Utilization,Ministry of Land and Resources,Xi’an University of Science and Technology,Xi’an 710054,China;Shaanxi Shanmei Huangling Mining(Group)Co.,Ltd.,Huangling 727307,China)

机构地区：[1]西安科技大学能源学院,陕西西安710054 [2]西安科技大学西部矿井开采及灾害防治教育部重点实验室,陕西西安710054 [3]西安科技大学自然资源部煤炭资源勘查与综合利用重点实验室,陕西西安710054 [4]陕西陕煤黄陵矿业有限公司,陕西黄陵727307

出　　处：《西安科技大学学报》2022年第1期91-98,共8页Journal of Xi’an University of Science and Technology

基　　金：国家自然科学基金项目(51874231);陕西省自然科学基础研究计划企业联合基金(2019JLZ-04)。

摘　　要：深部厚煤层综采工作面沿空开采下引发的煤柱动力失稳,是严重影响矿井的安全生产条件之一。以陕西某矿区留设35 m段煤柱稳定性为研究对象,通过赋存条件调查、理论分析、数值计算、现场监测等方法,分析区段煤柱在动、静载荷下的演化特征。研究表明:煤柱在静载向动载荷的转化过程中,35 m煤柱内部两侧的应力峰值从2 m迁移至8 m,双侧扰动下的应力明显高于煤体的抗压强度;内部的塑性破坏占比从9.52%增加至40%,最终35 m煤柱内部形成“梯型”稳态结构。根据现场煤柱动载荷影响,结合巷道布置方式提出进行分区支护原则。实践表明:巷道顶板及煤柱帮经历3种变化的位移特征,在距采空区70~90 m范围的运动达到极限。因此,35 m煤柱能满足开采极限条件下的支撑作用,满足生产的实际需要。The dynamic instability of coal pillar caused by gob mining in fully mechanized mining face of deep thick coal seam seriously affects the safety of mine production.The section coal pillar(35 m)at a coal mine in Shaanxi province is taken as the research object.The research means are applied including occurrence condition investigation,theoretical analysis,numerical calculation and field monitoring to study evolution characteristics of section coal pillar under dynamic and static loads.Research shows that:under different loads,the peak stress on both sides of the 35 m coal pillar moves from 2 m to 8 m,and the stress under bilateral disturbance is obviously higher than the compressive strength of the coal.The proportion of plastic failure inside increases from 9.52% to 40%,and a trapezoidal structure is formed inside of 35m pillar.According to the different mining influence of roadway in the field,the principle of partition support is proposed.It turns out that roof and coal pillar undergo three kinds of displacement characteristics,and the movement of goaf reaches the limit at 70 to 90 m.Therefore,35m coal pillar can play a good supporting role under the mining limit conditions and meet the production needs.

关 键 词：深部厚煤层 动载荷 静载荷 区段煤柱 

分 类 号：TD324[矿业工程—矿井建设]