摘要
为研究薄层陡倾砂板岩地层地下洞室群围岩稳定性,以玛尔挡水电站水库区某抽水蓄能电站为依托,分析了厂房洞室群层状岩体的分布规律,基于室内力学试验和应变软化力学模型确定了围岩力学参数,采用三维数值仿真分析方法,系统预测了洞室群开挖过程中围岩的变形特征及应力、塑性区分布特征。结果表明:围岩整体稳定性较好,洞室群围岩最大变形量达20.9 cm,最大压应力为35 MPa,最大塑性区深度达17.9 m;层间挤压带加剧了围岩的变形和应力集中程度;高边墙和端墙部位岩体塑性变形深度受层状岩体结构控制明显,f56断层对尾闸室下游侧边墙的变形具有显著影响。研究成果可为层状岩体地下洞室群的设计与施工提供重要参考。
To study the stability of surrounding rock mass for underground cavern groups in thin-bedded steeply dipping sand-slate strata,this study takes a pumped storage power station in the reservoir area of the Maerdang Hydropower Station on the Yellow River as the research object.It analyzes the distribution law of layered rock mass in the powerhouse cavern groups,determines the mechanical parameters of surrounding rock based on laboratory mechanical tests and the strain softening mechanical model,and systematically predicts the deformation characteristics,stress distribution and plastic zone distribution of surrounding rock during the excavation of cavern groups by means of 3D numerical simulation analysis.The results show that the overall stability of surrounding rock is good.The maximum deformation of surrounding rock in the cavern groups reaches 20.9 cm,the maximum compressive stress is 35 MPa,and the maximum depth of the plastic zone is 17.9 m.Interlayer compression zones intensify the deformation and stress concentration of surrounding rock.The depth of plastic deformation of rock mass in high side walls and end walls is obviously controlled by the layered rock mass structure,and the f56 fault has a significant influence on the deformation of the downstream side wall of the tailrace gate chamber.The research results can provide important reference for the design and construction of underground cavern groups in layered rock mass.
作者
巨广宏
付建伟
王志通
李瑞卿
高阳
JU Guanghong;FU Jianwei;WANG Zhitong;LI Ruiqing;GAO Yang(PowerChina Northwest Engineering Corporation Limited,Xi'an 710065,China;Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China)
出处
《西北水电》
2025年第6期64-72,共9页
Northwest Hydropower
基金
国家自然科学基金委员会——雅砻江流域水电开发有限公司雅砻江联合基金资助项目(U23B20147)。
关键词
围岩稳定
砂板岩
应变软化力学模型
变形特征
Surrounding Rock Stability
Sand-Slate
Strain Softening Mechanical Model
Deformation Characteristics
