某抽水蓄能电站地下厂房渗流特性及渗控效果研究  

Study on the Seepage Characteristics and Seepage Control Effect of an Underground Powerhouse of a Pumped Storage Power Station

作　　者：付鹏 陈孝兵[1,2] 涂小丽 阴婕 罗思源 宋昀 徐力群[1] FU Peng;CHEN Xiaobing;TU Xiaoli;YIN Jie;LUO Siyuan;SONG Yun;XU Liqun(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China;The National KeyLaboratory of Water Disaster Prevention,Hohai University,Nanjing 210098,China)

机构地区：[1]河海大学水利水电学院,南京210098 [2]河海大学水灾害防御全国重点实验室,南京210098

出　　处：《三峡大学学报（自然科学版）》2024年第4期10-15,共6页Journal of China Three Gorges University：Natural Sciences

基　　金：国家重点研发计划项目(2019YFC1510802);国家自然科学基金项目(41771033)。

摘　　要：地下厂房洞室群是抽水蓄能电站发电的主要部位,厂区渗流场的分布对其结构稳定性至关重要.某抽水蓄能电站深埋于地下,其上下水库水位差超过600 m,在高水库水位和山体高地下水位的作用下,地下厂房周围将产生很高的渗透压力.为研究该地下厂房设计渗控措施下的渗控效果,建立了符合工程区实际地形、地质和输水发电系统的三维有限元模型,基于地质勘测钻孔水位数据,首先对计算模型进行了参数率定及边界验证,然后探讨了地下厂房正常运行和排水系统失效时厂区的渗流特性.计算结果表明:建立的三维模型可用于工程区渗流场分析;厂区设计渗控措施的渗控效果良好,多层排水廊道与排水孔幕结合对于降低渗流自由面效果显著,可以有效缓解厂区渗透压力;排水系统逐渐失效会引起厂区渗流量的增加和不同程度地抬高地下水入渗高程,失效面积过大时,厂房有较大发生渗透破坏的风险.The underground powerhouse caverns serve as the primary site for power generation in a pumped storage power station.The distribution of seepage fields in the plant area is crucial to its structural stability.A pumped storage power station is deeply buried underground,with a water level difference exceeding 600 meters between the upper and lower reservoirs.Under the influence of high reservoir water levels and elevated groundwater levels in the mountainous terrain significant seepage pressures will be generated around the underground powerhouse.In order to investigate the seepage control effects under the designed seepage control measures for the underground powerhouse,a three-dimensional finite element model was established to reflect the actual topography,geology,and water transmission and power generation system of the engineering area.Based on geological survey borehole water level data,the calcification model was first calibrated for parameters and validated for boundaries Subsequently,the seepage characteristics of the plant area under normal operation and drainage system failure were explored.The results indicate that the established three-dimensional model is suitable for analyzing the seepage field in the engineering area.The seepage control measures in the plant area demonstrate good effectiveness with the combination of multi-layer drainage galleries and drainage holes,which significantly reduce the seepage free surface and effectively alleviate the seepage pressure in the plant area.Gradual failure of the drainage system can lead to an increase in seepage flux and varying degrees of rise in the groundwater infiltration elevation.When the failure area is extensive,the plant has a significant risk of seepage failure.

关 键 词：抽水蓄能电站 渗流场 渗透流量 敏感性分析 三维有限元模型 

分 类 号：TV223.6[水利工程—水工结构工程]