基于水库坝体浸润特征是水库安全性检测的重要指标, 常规观测手段受限于测点少, 费用高, 易受损坏等缺 点, 难以发挥出应有的效益。根据室内测定电阻率与土体含水率之间的相关关系, 提出利用并行电法技术连续多频 次测试坝体浸润特征的新思路。在坝体内部水位升降引起电阻率响应特征的数值模拟基础上, 结合室内物理模型 试验的结果表明, 并行电法技术可以达到连续监测坝体水位升降动态变化全过程的目的。在实际工程应用中采用 同一测点浸润前后电阻率的变化率和不同测线位置垂向上电阻率比值参数分析技术, 可直观有效地标定出坝体水 位的位置。现场监测试验结果证明了并行电法时移技术监测坝体内部浸润动态特征中的可行性, 为坝体安全评估 和治理提供了有力的技术支持。

The infiltration characteristics of dam body is an impo rtant index of reservoir safety test. The routine testing methods have the shortcoming s such as lack o f enoug h measuring points, high cost, and vulnerability, thus they cannot produce economic benefits. Accord2 ing to the relationship between the measured resistivity and soil moisture content, we put forw ar d a new idea of using the parallel electri2 cal technology to continuously test the infiltration characteristics of dam body. Based on the numer ical simulation of response characteris2 tics of dam resistivity caused by w ater level variation in the dam body and the laboratory physical model test, the parallel electric tech2 nique can be used to monito r the dynamic pro cess of dam w ater level var iatio n. According to the variation r ate of resistivity measured in the same monitoring po int before and after water level variatio n and the ratio parameter analysis technique of vertical resistivity meas2 ured in different positions of surv ey line, we can visually calibrate the position of water level in the dam body. The in2situ monitor ing re2 sults proved the feasibility of the parallel electr ic technolog y in detecting the infiltration characteristics of dam body , which can prov ide powerful technique support for the safety evaluation and treatment of r eservo ir dam.

浙江省公益技术研究社会发展基金项目( 2011C23049)