考虑电阻随机分布的坝体渗漏识别规律数值模拟研究  

Numerical Simulation of Dam Leakage Identification Considering Random Distribution of Resistivity

作　　者：孙佳易 王海军[1] 杨成 汤雷[1] 杭丹 SUN Jiayi;WANG Haijun;YANG Cheng;TANG Lei;HANG Dan(State Key Laboratory of Hydrology and Water Resources and Hydraulic Engineering,Nanjing Institute of Water Resources Science,Nanjing 210029,Jiangsu,China;Water Resources and Hydropower Bureau of Xinchang County,Xinchang 312500,Zhejiang,China;Jiangsu Flood Control and Drought Relief Center,Nanjing 211500,Jiangsu,China)

机构地区：[1]南京水利科学研究院水文水资源与水利工程科学国家重点实验室,江苏南京210029 [2]浙江省新昌县水利水电局,浙江新昌312500 [3]江苏省防汛防旱抢险中心,江苏南京211500

出　　处：《水力发电》2023年第6期57-65,98,共10页Water Power

基　　金：十四五国家重点研发项目(SQ2021YFC3000080)。

摘　　要：大坝内部渗漏缺陷会影响大坝的使用安全,目前检测大坝渗漏缺陷的主要方法之一是高密度电法,然而已有研究未考虑电阻随机分布下的坝体渗漏识别。为此,通过生成随机电阻的模型作为初始数据背景,假设渗漏处缺陷,采用温纳、偶极装置,利用res2Dmod、res2Dinv软件对模型进行正演和反演,分别通过以下两种方法进行识别:①对反演结果图进行单独识别,根据电阻率异常确定大坝内隐患部位;②将反演结果图对照初始数据背景反演图初步识别再利用两者电阻差进行二次甄别确定隐患位置。仿真结果表明,电阻随机分布情况下,未采取初始数据背景对照做差的渗漏识别误差大、干扰多,采取初始数据背景对照做差的渗漏识别结果准确、清晰。The internal leakage defects of dam will affect the safety of dam.At present,one of the main methods to detect the leakage defects of dam is the high-density electrical method.However,the existing studies do not consider the identification of dam leakage under the random distribution of resistance.In this paper,the model of random resistance is generated as the initial data background,and by assuming the defects at the leakage are,the Wenner and Dipole devices are used and the res2Dmod and res2Dinv software are used to forward and reverse the model.The identification is carried out by the following two methods:(a)the inversion result map is separately identified,and the hidden danger position in dam is determined according to the resistivity anomaly;(b)the inversion result map is preliminarily identified by comparing with the initial data background inversion map,and then the resistance difference between the two is used for secondary identification to determine the hidden danger position.The simulation results show that,under the condition of random distribution of resistance,the leakage identification result is poor when without initial data background comparison,and is accurate and clear when with initial data background comparison.

关 键 词：高密度电阻率法 随机电阻分布 初始数据背景 大坝渗漏 渗漏识别 数值模拟 

分 类 号：TV698.1[水利工程—水利水电工程]