窄煤柱沿空掘巷巷道围岩变形影响因素及非对称支护技术研究  

Study on influencing factors of surrounding rock deformation and asymmetric support technology for roadway driving along goaf with narrow coal pillars

作　　者：陈晓祥[1,2] 张天 王逸良 CHEN Xiaoxiang;ZHANG Tian;WANG Yiliang(School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo454000,Henan,China;Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization,Jiaozuo454000,Henan,China)

机构地区：[1]河南理工大学能源科学与工程学院,河南焦作454000 [2]煤炭安全生产与清洁高效利用省部共建协同创新中心,河南焦作454000

出　　处：《河南理工大学学报（自然科学版）》2021年第6期24-33,共10页Journal of Henan Polytechnic University（Natural Science）

基　　金：国家自然科学基金资助项目(U1504515,51304068);中国煤炭工业协会指导性研究计划项目(MTKJ2015-251);河南省高等学校青年骨干教师培养计划项目(2017GGJS055);河南省高校基本科研业务费专项项目(NSFRF140134)。

摘　　要：为确定窄煤柱沿空掘巷巷道围岩变形影响因素和围岩控制方案,以晋能控股集团煤业集团有限公司隆博煤业有限公司8507工作面回风巷为工程背景,基于正交试验和FLAC3D数值模拟试验对沿空掘巷巷道围岩变形影响因素、不同条件下巷道围岩变形特征、4~10 m不同宽度煤柱的塑形区破坏范围、巷道围岩应力分布和顶板位移特征进行研究。结果表明:在煤柱宽度、煤体内聚力、煤体内摩擦角、直接顶厚度和顶板强度5种影响因素中,煤柱宽度对巷道围岩变形影响最显著;随煤柱宽度增加,巷道围岩塑性区破坏和变形主要表现在窄煤柱帮、顶板、底板和实体煤侧等部位,塑性区范围变化较小;合理的煤柱留设宽度为8 m;巷道围岩变形为非对称性变形,煤柱侧巷道顶板和帮部变形显著大于工作面开采侧的。根据窄煤柱沿空掘巷巷道围岩变形特征,提出"顶板和两帮锚网索+钢带、窄煤柱帮贴帮槽钢梁+注浆加固补强"的非对称支护方案。现场工业性试验结果表明,煤柱留设宽度和支护方案合理,巷道变形后能够满足工作面开采需要。研究结果可为类似地质条件下窄煤柱沿空掘巷巷道围岩控制提供参考依据。In order to determine the influencing factors and control technology for the deformation of the surrounding rock in the roadway driving along goaf with narrow coal pillar, taking the railway of Longbo Coal Industry 8507 working face as the engineering background, the orthogonal test was designed based on the orthogonal table and simulation software FLAC3 D to study the factors affecting the deformation of surrounding rock in roadways along the gob and the deformation characteristics of surrounding rock in different conditions, the damage range of the shaping zone of the coal pillar with width of 4~10 m, the surrounding rock stress and roof displacement distribution.The research results showed that among the five factors: coal pillar width, coal cohesion, friction angle of coal immediate roof thickness and roof strength, coal pillar width had the most significant effect on the surrounding rock deformation of the roadway;The changes in the damage range and shape of the plastic area of the roadway were mainly reflected in the narrow coal pillars and the roof, and the size of the plastic areas on the floor and the solid coal side was small.The rock deformation was asymmetric deformation, and the deformation of the roof and side of the roadway on the coal pillar side was significantly larger than that on the mining side of the coal face.An asymmetrical support scheme was proposed for the roof and two pairs of anchor mesh cables+steel belts, narrow coal pillars to help channel steel beams+grouting reinforcement.The results of on-site industrial tests showed that the coal pillar width and support scheme were reasonable, and the roadway deformation met the needs of the coal face.The research results could provide reference for the surrounding rock control of small coal pillars along the goaf under similar geological conditions.

关 键 词：沿空掘巷 窄煤柱 围岩变形 正交试验 数值模拟 非对称支护 

分 类 号：TU378[建筑科学—结构工程]