复合顶板倾斜薄煤层小煤柱稳定机理与控制研究  

Stability Mechanism and Control of Small Coal Pillar in Inclined Thin Coal Seam with Compound Roof

作　　者：康志鹏 罗勇 任波 童政 段昌瑞 KANG Zhipeng;LUO Yong;REN Bo;TONG Zheng;DUAN Changrui(National Key Laboratory of Safe Mining and Environmental Protection of Deep Coal,Huainan Mining Group Co.,Ltd.,Huainan,Anhui 232001,China;Key Laboratory of National Mine Safety Supervision Bureau for Coupling Disaster Prevention and Control of Deep Coal Mining,Huaihe Energy Holding Group Co.,Ltd.,Huainan,Anhui 232001,China)

机构地区：[1]淮南矿业(集团)有限责任公司深部煤炭安全开采与环境保护全国重点实验室,安徽淮南市232001 [2]淮河能源控股集团有限责任公司深部煤炭开采耦合灾害防控国家矿山安全监察局重点实验室,安徽淮南市232001

出　　处：《矿业研究与开发》2024年第9期40-47,共8页Mining Research and Development

基　　金：安徽省自然科学基金项目(2108085ME155,2108085QE209);安徽省重点研究和开发计划资助项目(201904a07020011,1804a0802214)。

摘　　要：为解决沿空掘巷大煤柱资源浪费、小煤柱护巷困难的难题,以宏能煤业花草滩煤矿2104工作面为工程背景,采用理论分析、数值模拟与工程实践相结合的研究方法,对倾斜煤层开采扰动下小煤柱的合理宽度进行研究,给出梯形巷道沿空掘进高强复合加固支护方案。结果表明:基于岩体极限平衡理论得出煤柱宽度计算公式,并根据矿井实际数据得出煤柱宽度应大于3.35 m;巷道开挖后,侧向支承应力峰值会运移至煤体深部,其位置会随着煤柱宽度的增加而逐渐远离采空区,煤柱垂直应力峰值会随着煤柱宽度呈现先增加后减小,最终逐渐稳定的趋势;留设煤柱宽度为5 m时,巷道变形稳定,变形量小,煤柱承受的围岩应力减小,煤柱中心无塑性区贯通。现场实践表明,留设5 m煤柱,在采动影响段巷道采用“对穿锚索双向固定+一梁三柱补强支护”的方案,在沿空掘巷段布置穿层锚索深部锚固的支护方案,沿空梯形巷道变形较小,可满足安全生产的需要,经济效益显著。In order to solve the problem of waste of large coal pillar resources and difficult protection of small coal pillar in gob-side entry driving,taking the 2104 working face of Huacaotan Coal Mine of Hongneng Coal Industry as the engineering background,the reasonable width of small coal pillars under the disturbance of inclined thin coal seam mining was studied using the research methods of theoretical analysis,numerical simulation and engineering practice,and the high-strength composite reinforcement support scheme for gob-side entry driving in trapezoidal roadway was given.The results show that the calculation formula of coal pillar width is obtained based on the limit equilibrium theory of rock mass,and the coal pillar width should be greater than 3.35 m according to the actual data of the mine.After the excavation of the roadway,the peak value of the lateral abutment stress will migrate to the deep part of the coal body,and its position will gradually move away from the goaf with the increase of the width of the coal pillar.The peak value of the vertical stress of the coal pillar will increase first and then decrease with the width of the coal pillar,and finally gradually stabilize.When the width of the coal pillar is 5 m,the deformation of the roadway is stable,the deformation is small,the stress of the surrounding rock of the coal pillar is reduced,and there is no plastic zone in the center of the coal pillar.The field practice shows that the deformation of the trapezoidal roadway along the goaf is small by setting 5 cm coal pillar,adopting the method of“two-way fixation of the crossing anchor cable+one beam and three column reinforcement support”in the mining influence section of the roadway,and arranging the support method of deep anchoring of the crossing anchor cable in the gob-side entry driving section,which meets the needs of safe production and has significant economic benefits.

关 键 词：复合顶板 倾斜薄煤层 小煤柱 梯形巷道 控制方案 

分 类 号：TD263[矿业工程—矿井建设]