摘要
为研究浅埋深坚硬厚顶板条件下合理护巷煤柱宽度,依据现场实测数据分析了工作面回采全过程围岩应力响应特征,研究了煤柱应力分布演化规律,采用数值模拟软件建立了不同煤柱宽度二维离散元模型,探讨了不同煤柱宽度条件下围岩应力与塑性区的分布规律。结果表明:煤柱侧向悬顶是造成巷道围岩应力响应强烈的主要原因,滞后工作面124~405.6 m顶板不同层位岩层运动强烈,靠近煤柱侧顶板锚杆(索)受力变化大,最大变化幅度达54 kN,滞后工作面距离大于405.6 m时锚杆(索)受力基本趋于稳定;巷道围岩变形以底鼓为主,且底鼓量占顶底板移近量的95%以上;煤柱应力分布呈“单峰型”分布特征,峰值应力分布在8~14 m范围内,采用理论计算得出了煤柱临界宽度为17.6 m;数值模拟表明煤柱宽度为18 m时,煤柱应力及塑性区分布均可满足保持巷道稳定的要求,理论计算与数值模拟综合分析确定了类似条件下合理煤柱宽度为18 m,并依据顶板岩层分布特征,提出了“支护-卸压”协同控制技术进一步优化煤柱宽度的思路及建议。
In order to study the reasonable roadway pillar width under the condition of shallow buried deep hard thick roof,the response characteristics of surrounding rock stress during the whole mining process of the working face were analyzed based on the field measured data,and the evolution law of coal pillar stress distribution was studied.A two-dimensional discrete element model with different coal pillar widths was established by using numerical simulation software,and the distribution law of surrounding rock stress and plastic zone under different coal pillar widths was discussed.The results show that the lateral suspension of the coal pillar is the main reason for the strong stress response of the surrounding rock of the tunnel.The rock strata at different layers of the 124~405.6 m lagging working face roof move strongly,and the force of the anchor rod and cable near the coal pillar side roof changes greatly,with a maximum amplitude of 54 kN.When the lagging working face distance is greater than 405.6 m,the force of the anchor rod and cable tends to be stable basically.The deformation of the surrounding rock of the tunnel is mainly caused by floor heave,and the amount of floor heave accounts for over 95%of the displacement of the top and bottom floors.The stress distribution of the coal pillar exhibits a“single peak”distribution feature,with peak stress distribution within the range of 8~14 m.Theoretical calculations have shown that the critical width of the coal pillar is 17.6 m;Numerical simulation shows that when the width of the coal pillar is 18 m,the distribution of stress and plastic zone in the coal pillar can meet the requirements of maintaining tunnel stability.Theoretical calculation and numerical simulation comprehensive analysis have determined a reasonable coal pillar width of 18 m under similar conditions.Based on the distribution characteristics of the roof strata,the support and unloading collaborative control technology has been proposed to further optimize the width of the coal pillar.
作者
华照来
程利兴
任建超
冯裕堂
刘茂福
汪占领
HUA Zhaolai;CHENG Lixing;REN Jianchao;FENG Yutang;LIU Maofu;WANG zhanling(Shaanxi Shanmei Caojiatan Mining Co.,Ltd.,Yulin 719000,China;CCTEG Coal Mining Research Institute,Beijing 100013,China;Coal Mining and Designing Department,Tiandi Science and Technology Co.,Ltd.,Beijing 100013,China)
出处
《西安科技大学学报》
CAS
北大核心
2023年第6期1063-1070,共8页
Journal of Xi’an University of Science and Technology
基金
国家自然科学基金项目(52274123)
中煤科工开采研究院有限公司青年基金项目(KCYJY-2023-QN-04)
中煤科工开采研究院有限公司科技创新基金项目(KCYJY-2023-MS-07)。
关键词
坚硬厚顶板
动压巷道
煤柱优化
采动应力
hard and thick roof
dynamic pressure roadway
coal pillar optimization
mining-induced stress
作者简介
第一作者:华照来,男,安徽安庆人,高级工程师,E-mail:356182594@qq.com;通信作者:程利兴,男,河南永城人,博士,助理研究员,E-mail:chenglixinghpu@163.com。
