尼尔基水利枢纽右副坝I标钻孔高喷防渗墙试验施工

尼尔基水利枢纽右副坝工程位于右岸白土山台地上,为粘土心墙土石坝,坝基地质条件复杂。设计坝基在粘土心墙中心线布置一排高压喷射灌浆防渗墙。为确定在这种复杂地层条件下钻孔高喷灌浆的合理工艺及技术参数,在高喷灌浆正式开工前进行了不同孔距、不同高喷参数的灌浆试验。通过在具有广泛代表性的地层及砂砾石层的两次高喷试验,最终确定1.4m的施工孔距,及适合于尼尔基右副坝地质条件的施工参数。

Tests on the jet grouting impervious wall in the bid-I boring hole of right auxiliary dam of Ni'erji water conservacy project

The right auxiliary dam of the Ni'erji water conservancy project is located in the Baitushan Terrance in the right bank and is a clay core wall earth-rock dam,with a complex geological conditions of dam foundation.It is designed to arrange a row of jet grouting impervious wall in the dam foundation along the centerline of clay core wall.In order to determine the rational techniques and technical parameters of jet grouting in boring hole with such complex geological conditions,the grouting tests had been made in different hole spans and different jet grouting parameters before the formal commencement of jet grouting.On the basis of two jet-grouting tests in widely-representative stratum and sand-gravel layer,the construction hole span of 1.4 m and the construction parameters suitable to the geological conditions of the right auxiliary dam of Ni'erji water conservancy project was finally determined.