大坝基础帷幕体防渗效果评价方法综述

Anti-seepage effect evaluation of dam foundation curtain

由于地质条件复杂、设计标准不一等原因,部分大坝存在安全隐患,坝基渗流就是其中之一。大坝基础的工作性态很大程度上受控于帷幕体的完好程度和止水效果。评价帷幕体防渗效果及其时效的方法有多种,包括压水试验法、声波CT法、地下水宏观动态分析方法、地下水微观动态分析方法以及析出物分析方法等,本文对之逐一展开讨论,并给予评述,认为宜采用多指标评价的方法。

Because of complex geological conditions and different design standards, some dams are found potential problems and seepage is one of them. The working performance of dam foundation, to a large degTee, is controlled by curtain extent and its sealing effect. There are many methods to appraise anti-seepage effect of curtain-grouting and its time-variance, such as water pressure test, computer tomography, macroscopic and microscopic dynamic analysis of groundwater, evaluation of sludge and so on. This paper discussed these methods and gave comments. At last, the idea that multiple approaches should be adopted in evaluation was advanced.