摘要
为了研究不同工作面尺寸以及不同地应力条件下的沿空留巷煤柱宽度确定方法,以甘肃庆阳核桃峪煤矿为背景,使用等效圆孔模型对矩形采空面进行替代,将煤柱简化为遍布水平节理与竖直节理的节理模型,引用弹性力学中应力势函数,结合摩尔-库伦准则对水平节理的剪切强度以及数值节理的剪切与拉伸强度进行分析;同时探究了不同等效圆孔半径和不同侧压系数下的煤柱抗剪强度曲线。结果表明:水平节理的剪切破坏是造成煤柱失稳破坏的主要原因,竖直节理的拉伸破坏主要集中在煤柱表面;同时,较大的等效圆孔半径会造成更大的影响范围以及更大的煤柱破坏面积;而较大的侧压系数能够提供给煤柱较大的围压,提高煤柱的抗压能力,进而使得煤柱的失稳破坏面积显著减小。该研究可以为煤矿开采工程中的沿空留巷煤柱宽度确定提供一种新的方法。
In order to study the method of determining the width of coal pillar retaining roadway along goaf under different face sizes and different ground stress conditions,taking Hetaoyu coal mine in Qingyang,Gansu province as the background,the equivalent circular hole model is used to replace the rectangular goaf.The coal pillar is simplified to a joint model with horizontal and vertical joints,and the stress potential function in elasticity is introduced.Combined with Mohr-Coulomb criterion,the shear strength of horizontal joints and the shear and tensile strength of numerical joints are analyzed.At the same time,the shear strength curves of coal pillars under different equivalent round hole radii and different lateral pressure coefficients are explored.The results show that the shear failure of horizontal joints is the main cause of coal pillar instability failure,and the tensile failure of vertical joints is mainly concentrated on the surface of coal pillar;at the same time,larger equivalent circular hole radius will cause larger influence range and larger failure area of coal pillar,while larger lateral pressure coefficient can provide larger confining pressure and improve the compressive capacity of coal pillar,so that the instability failure area of coal pillar can be significantly reduced.This study can provide a new method for determining the width of coal pillar along goaf in coal mining engineering.
作者
梁戈龙
杨小全
焦建军
张海成
李秀军
经来旺
彭绍驰
李树文
LIANG Gelong;YANG Xiaoquan;JIAO Jianjun;ZHANG Haicheng;LI Xiujun;JING Laiwang;PENG Shaochi;LI Shuwen(Huaneng Qingyang Coal Power Co.,Ltd.,Qingyang 745000,China;School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,China)
出处
《煤炭技术》
CAS
北大核心
2023年第8期52-56,共5页
Coal Technology
基金
国家自然科学基金项目(51904012)
安徽省高等学校自然科学研究重点项目(KJ2019A0099)
安徽省博士后研究人员科研活动经费资助项目(2018B268)。
关键词
应力势函数
煤柱宽度
遍布节理
失稳破坏
侧压系数
stress potential function
coal pillar width
spread all over the joint
instability failure
lateral pressure coefficient
