三峡工程三期土石围堰防渗墙施工工艺试验(Ⅱ)

Technological Test for Construction of Impervious Core of Earth-rockfill Cofferdam (3rd-phase)of TGP(Ⅱ)

为确保防渗墙墙体防渗效果和施工工期要求 ,在防渗墙大规模施工前进行了振孔高喷、常规高喷、钻喷一体化和自凝灰浆防渗墙等成墙工艺的现场试验 。

The volume of the cofferdam (3rd-phase)of TGP is very large and its construction is pressed for time. For ensuring that the impervious core of the cofferdam has a good quality and could be completed in time limit, a number of tests are carried out before its construction, i.e. high-pressure vibro-grouting as principal with conventional grouting as supplementary, drilling and grouting simultaneously, self-setting mortar grouting etc. The results show these technologies are preferable for the cofferdam construction.