摘要
为研究近距离煤层群开采过程中下位煤层巷道稳定性,以山西某煤矿为工程背景,基于弹性力学理论,建立近距离煤层区段煤柱力学模型,采用主应力差作为巷道稳定性判据,并利用数学计算软件将主应力差分布图像化。研究结果表明:1)工作面埋深影响底板应力环境,埋深越大,围岩主应力差越大,巷道稳定性越低;2)巷道稳定性在不同应力集中系数条件下存在显著差异,通过一定手段适当降低应力集中系数,使顶板和两帮均处在“右螺旋”中心线附近,能够有效提高巷道稳定性;3)上位工作面长度从120 m增加至220 m,顶板、左帮和右帮主应力差分别降低约44%,50%,56%,适当增加上位煤层工作面长度可有效提高巷道稳定性。上位工作面长度变化使底板“螺旋”产生运移是影响下位巷道主应力差变化的关键原因。研究结果可为近距离煤层下位巷道稳定性分析提供参考价值。
To study the stability of lower coal seam roadway in the process of close coal seam group mining,take a Shanxi coal mine as the engineering background,based on the half-plane theory,the mechanical model of combined action of the upper coal pillar and the compacted goaf load is established.This study uses the principal stress difference as the criterion of roadway stability,and uses Mathematica software to visualize the principal stress difference distribution.Research shows:1)The buried depth of the working face has a certain impact on the stress environment of the floor.The greater the buried depth,the greater the difference of the principal stress of the surrounding rock and the lower the stability of the roadway;2)The effective stress concentration coefficient of the two sides of the roadway can be significantly reduced under different"spiral wall"conditions,and the stability of the two sides of the roadway can be improved;3)The length of the upper working face is increased from 120 m to 220 m,and the main stress difference of the roof,left side and right side is reduced by about 44%,50%and 56%respectively.Appropriately increasing the length of the upper coal seam working face can effectively improve the stability of the roadway.The movement of floor"spiral"caused by the change of upper working face length is the key reason affecting the change of principal stress difference of lower roadway.The research results can provide reference value for the stability analysis of the lower roadway in close distance coal seams.
作者
刘华博
王冰洋
孟凡净
花少震
王浩
LIU Huabo;WANG Bingyang;MENG Fanjing;HUA Shaozhen;WANG Hao(School of Mechanical Engineering,Henan Institute of Technology,Xinxiang 453003,China;School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,China)
出处
《中国测试》
CAS
北大核心
2023年第9期154-160,共7页
China Measurement & Test
基金
国家自然科学基金资助项目(51904091)
河南省高等学校重点科研项目(21A130001)。
关键词
采矿工程
弹性力学
主应力差
巷道
采动应力
mining engineering
elastic mechanics
principal stress difference
roadway
mining stress
