东庄水利枢纽工程地下厂房洞室群渗流仿真分析

Simulation Analysis of Seepage in Underground Powerhouse Caverns of Dongzhuang Water Control Project

东庄水利枢纽工程位于北方岩溶区,复杂的地质条件对地下厂房洞室群的渗流分析和渗控措施合理性提出了很高要求。通过建立东庄工程左岸地下厂房区的三维有限元模型,对水库蓄水后左岸厂区的渗流场进行分析。研究结果显示,蓄水后主厂房发电机层以上和主变洞均基本处于干燥状态,厂区排水孔幕和排水廊道等排水设施对地下厂房洞室群疏排上游库水起到了关键作用;左岸库区帷幕在阻渗和降压方面发挥了积极作用,延长了库水外渗的渗径;厂区防渗排水系统满足设计要求,渗控措施合理可行。研究结果可为我国北方岩溶区的地下厂房洞室群渗流分析和防渗设计提供借鉴。

The Dongzhuang water conservancy project is located in the northern karst area,and high standards are required for the seepage analysis and rationality of seepage control measures for the underground caverns due to the complex geological conditions.By establishing a threedimensional finite element model describing the underground caverns at the left bank of the Dongzhuang project,the seepage field at the left bank after the reservoir filling has been analyzed.The research results show that after the reservoir filling both the generator layer above the main power house and the main transformer cavern are basically in a dry state.Drainage facilities such as drainage holes and corridors play a key role in the drainage of upstream reservoir water from the underground caverns.The anti-seepage curtain of the reservoir area at the left bank area has played a positive role in preventing seepage and reducing pressure,extending the seepage path of the reservoir water.The anti-seepage drainage system of the underground caverns could meet the design requirements,and the seepage control measures are reasonable and feasible.The research results provide a reference for the seepage analysis and anti-seepage design of underground caverns in karst areas of northern China.