电阻率成像技术在土石坝渗漏诊断中的应用

为了能较准确诊断土石坝渗漏部位,基于介质电阻率参数对水较为敏感这一特性,将电阻率层析成像技术应用于大林病险水库土石坝渗漏的诊断测试中,查明了扩建坝体黏土斜墙331.50 m高程以上部分坝体及左岸岩体中存在的渗漏通道,同时原均质土坝在高程329.0 m以上的近右坝肩存在渗漏隐患。依据诊断结果提出了该病险水库加固设计方案中需将331.50 m以上坝体挖除、防渗帷幕向左岸延伸61 m以及置换原均质土坝在高程329.0m以上的近右坝肩部分坝体等建议。为保证大林病险水库除险加固的顺利实施提供了科学依据。

Application of Electrical Resistivity Tomography to Leakage Diagnosis of Earth Rock-Fill Dam

In order to make a more accurate diagnosis of leakage position,the resistivity tomographic technology is used in the leakage diagnosis of earth rock-fill dam at Dalin reservoir,for the resisitivity parameters of medium are sensitive to the water.The results of field investgation show that,there are seepage flows located above the part of 331.5 m at the extended earth rock-fill dam and the left bank part of the dam;at the same time,there is seepage potential located above 329.0 m at the right bank part of homogeneous earth dam.The reinforced methods are proposed according to the diagnosis results,including replacing earth-rock matierials located above 331.5 m and 329.0 m at the right bank part of homogeneous earth dam,constructing a 61 m length impermeable barrier and so on,which provide scientific basis for the repairment and reinforcement of earth rock-fill dam of Dalin reservoir.