锚杆对煤矿地下水库人工坝体加固作用的数值模拟研究  

Numerical simulation research on the reinforcement effect of anchor bolt on artificial dam body of underground reservoir in coal mine

作　　者：李晓斌 李鹏 武洋 LI Xiaobin;LI Peng;WU Yang(CHN Energy Shendong Coal Group Co.,Ltd.,Shenmu 719315,China;State Key Laboratory of Water Resource Protection and Utilization in Coal Mining,National Institute of Clean and Low-Carbon Energy,Beijing 102209,China)

机构地区：[1]国能神东煤炭集团有限责任公司,陕西神木719315 [2]煤炭开采水资源保护与利用全国重点实验室北京低碳清洁能源研究院,北京102209

出　　处：《中国矿业》2025年第3期236-242,共7页China Mining Magazine

基　　金：国家自然科学基金项目资助(编号:52404109);国家能源集团科技创新项目资助(编号:GJNY-21-26-04)。

摘　　要：煤矿地下水库技术化水害为水利,为西部生态脆弱矿区煤炭开采水资源保护与利用、生态修复提供了有效途径;同时,人工坝体稳定性是保障地下水库安全运行的必要条件,因此,本文针对锚杆对地下水库人工坝体的加固作用,基于FLAC^(3D)数值模拟方法,基于三线性模型改进的Pile结构单元建立了锚固作用下煤矿地下水库挡水坝体数值模型,分析了锚杆加固对人工坝体变形特征的影响规律。研究结果表明:修正改进模型将黏结滑移曲线分为线弹性上升阶段、线弹性下降阶段和水平拉直阶段,更加符合工程实际情况;同时,锚杆受到轴力和剪切力的作用,最大剪力达到2.88kN,最大弯矩达到273.8N·m;在弯矩作用下锚杆沿水浸方向发生一定程度的弯曲变形,在锚杆支护条件下人工坝体的最大变形量为149mm,而无支护条件下人工坝体的最大变形量为160mm,相对减小约7%,说明了锚杆支护对人工坝体的锚固作用。研究成果为煤矿地下水库坝体建设与安全运行奠定坚实基础。The technology of underground reservoirs in coal mines has transformed water hazards into water resources,providing an effective approach for water resource protection,utilization and ecological restoration in coal mining areas with fragile ecosystems in Western China.Meanwhile,the stability of artificial dams is a necessary condition to ensure the safe operation of underground reservoirs.Therefore,in view of the reinforcement effect of bolts on the artificial dams of underground reservoirs in coal mines,based on the FLAC^(3D) numerical simulation method and the Pile structural element improved by the trilinear model,a numerical model of the water-retaining dam body of the underground reservoir in coal mine under the anchoring effect is established,and the influence law of bolt reinforcement on the deformation characteristics of the artificial dam body is analyzed.The research results indicate that the modified and improved model divides the bond-slip curve into the linearly elastic ascending stage,the linearly elastic descending stage and the horizontally straightened stage,which is more in line with the actual engineering situation.Meanwhile,the bolts are subjected to axial forces and shear forces,with the maximum shear force reaching 2.88 kN and the maximum bending moment reaching 273.8 N·m.Under the action of the bending moment,the bolts undergo a certain degree of bending deformation along the water immersion direction.Under the condition of bolt support,the maximum deformation of the artificial dam body is 149 mm,while under the condition without support,the maximum deformation of the artificial dam body is 160 mm,which is relatively reduced about 7%,indicating the anchoring effect of bolt support on the artificial dam body.The research results lay a solid foundation for the construction and safe operation of the dam body of the underground reservoir in coal mine.

关 键 词：地下水库 人工坝体 锚杆 煤矿 煤炭开采 

分 类 号：TD745[矿业工程—矿井通风与安全]