摘要
根据山西马堡煤矿地质条件,通过极限平衡理论、内外应力场理论计算出迎采巷道煤柱宽度范围为6.48~8.97 m.采用FLAC3D数值模拟软件,分别模拟了煤柱宽度为5~9 m时,在15202运输顺槽掘进过程中,煤柱应力分布、塑性区分布及迎采沿空巷道围岩变形规律,结果表明:随着煤柱宽度的增加,煤柱峰值应力及塑性区范围不断减小,煤柱宽度为7 m以后,峰值应力减小趋势和塑性区变化均不明显,围岩变形逐渐趋于稳定,综合考虑安全开采和资源高效利用,最终确定煤柱宽度为7 m.通过模拟煤柱不同位置在采掘过程中的应力变化,确定采掘应力叠加影响范围为采掘间距30~-30 m,并结合15202运输顺槽不同位置的围岩变形情况,给出了合理的支护建议。
According to the geological conditions of Mabao Coal Mine in Shanxi Province,the width range of the coal pillar of the heading roadway is 6.48~8.97 m calculated by the limit equilibrium theory and the internal and external stress field theory.By using FLAC3D,the vertical stress and plastic zone distribution of coal pillar and the deformation of surrounding rock of roadway were simulated when the width of coal pillar is 5~9 m.The results show that with the increase of coal pillar width,the peak stress and plastic zone range of coal pillar decrease continuously.After the width of coal pillar reaches 7 m,the peak stress reduction trend and plastic zone change are not obvious,and the surrounding rock deformation gradually tends to be stable,in consideration of safe mining and efficient utilization of resources,the width of coal pillar is finally determined to be 7 m.By simulating the stress changes at different positions of the coal pillar in the process of mining,it is determined that the influence range of mining and excavation is 30 to-30 m at the same time.Combined with the deformation of surrounding rock at different positions of the 15202 transportation gateway,a reasonable subsection support scheme is given.
作者
郑文翔
庄志鹏
郭帅
杨家琦
ZHENG Wenxiang;ZHUANG Zhipeng;GUO Shuai;YANG Jiaqi(Institute of Mining and Coal,Inner Mongolia University of Science and Technoloy,Baotou 014000,China)
出处
《太原理工大学学报》
CAS
北大核心
2023年第3期466-472,共7页
Journal of Taiyuan University of Technology
关键词
迎采沿空掘巷
窄煤柱宽度
内外应力场
围岩控制
roadway driven heading for adjacent advancing coal face
width of narrow coal pillar
internal-external stress fields
control of surrounding rock