基于监测和探测资料的某堆石坝及坝基渗流场数值反演分析  

Numerical Inverse Analysis of Seepage Field in a Rockfill Dam and Its Foundation Based on the Monitor and Prospecting Data

作　　者：盖皓茜 陈群[1] 杜辉 周小来 GE Haoqian;CHEN Qun;DU Hui;ZHOU Xiaolai(State Key Laboratory of Mountain River Protection and Management,College of Water Resources and Hydropower,Sichuan University,Chengdu 610065,China;Power China Chengdu Engineering Corporation Limited,Chengdu 610065,China;Sichuan Chuantou Renzonghai Power Generation Co.,Ltd.,Kangding 626000,China)

机构地区：[1]四川大学水利水电学院山区河流保护与治理全国重点实验室,四川成都610065 [2]中国电建集团成都勘测设计研究院有限公司,四川成都610065 [3]四川川投仁宗海发电有限责任公司,四川康定626000

出　　处：《人民黄河》2025年第5期134-141,共8页Yellow River

基　　金：国家自然科学基金面上项目(41977239)。

摘　　要：针对某水库堆石坝及其坝基渗流问题,基于监测资料及物探成果,建立了考虑大坝防渗体系缺陷的数值分析模型,对大坝和坝基渗流场开展反演分析。研究防渗体系缺陷对渗流场的影响规律,探讨大坝渗漏的主要原因,并对坝体和坝基覆盖层的渗流安全予以评价。研究结果表明:反演分析与监测和探测结果较吻合,渗漏量的70.6%来源于右岸坝肩帷幕的渗漏和岩体的绕渗,14.1%来源于防渗墙渗漏,13.1%来源于防渗墙底绕渗;左岸帷幕和土工膜缺陷引起的渗漏量较小。右岸地势高于左岸加之右岸坝肩的严重绕渗,致使右岸坝基中的水头明显高于左岸的,渗透水流有自右向左的汇流现象。在防渗墙后存在多处渗压异常偏高点,表明防渗墙或土工膜与防渗墙连接处存在缺陷,成为渗漏通道。坝基覆盖层中的水力坡降仅在个别点位超过土体的允许坡降,对坝基整体渗流安全影响不大。Aiming at the leakage issue of a reservoir rockfill dam and its foundation and based on the monitoring data and geophysical pros⁃pecting results,a numerical analysis model considering the defects of the dam seepage⁃control system was established and the inversion analy⁃sis on the seepage field of the dam and its foundation was carried out.The influence of the defects of the seepage⁃control system on the seep⁃age field was studied.The main causes of dam leakage were discussed,and the seepage safety of the dam and foundation overburden was as⁃sessed.The results show that the inversion analysis is in good agreement with the monitoring and detection results.70.6%of the total leakage discharge comes from the leakage of dam⁃shoulder curtain on the right bank and the bypassing of the rock mass,14.1%from the impermeable wall and 13.1%from the seepage around the bottom of the anti⁃seepage wall.The leakage caused by the defects of the left⁃bank curtain and geomembrane on the upstream dam surface is small.Due to the terrain of the right bank is higher than that of the left bank and the serious leakage from rock mass of the right dam⁃shoulder,the water head in the foundation of the right bank is significantly higher than that of the left bank,and there is a phenomenon that the seepage water flows from the right to the left.There are several abnormally high seepage pressure points behind the impermeable wall,indicating that there are defects at the connection between the anti⁃seepage wall or the geomembrane and the anti⁃seepage wall,which have become seepage channels.The hydraulic gradient in the foundation overburden only exceeds the allowable gradient of the soil at a few points,and has little impact on the whole seepage safety of the dam foundation.

关 键 词：堆石坝 渗流场 数值模拟 反演分析 渗流稳定性 

分 类 号：TV641.4[水利工程—水利水电工程]