高喷防渗墙防渗性能围井法检测操作探讨

Discussion on the Operation of Seepage Prevention Function for Jet Grouting Anti-Seepage Wall in Bounding Well Method

通过对规范推荐渗透系数计算公式原理和模型解析,探讨采用围井法检测高喷防渗墙防渗性能在工程应用操作中的注意要点和适用条件,指出了围井试验过程中渗流量测量、围井内外水位测量、防渗墙厚度测量的操作要点。某病险土坝加固工程围井试验结果表明:围井防渗墙的渗透系数为1.02×10-7cm/s,满足设计要求,该围井灌浆施工参数可运用到与之地质情况相近地段的坝体防渗墙施工中。

Depending on the analysis of the principle and model of the formula proposed by the relative specification for the calculation of grouting anti-seepage wall＇s permeability coefficient,this paper probed into the concerned key points and application conditions,elaborating on the operating hints and pointed out the measurement of seepage discharge,water levels inside and outside of the wall,and thickness of anti-seepage wall.From the result of bounding well method in a reinforcement engineering of devastated and dangerous earth dam,it is shown that the anti-seepage wall permeability coefficient is 1.02×10-7 cm/s,which can meet the design requirements,and the used grouting parameters can also be applied in the sections of anti-seepage wall where the geological conditions are similar to that of the bounding wall.