高浓度膨润土泥浆在大口径越江顶管工程中的应用

Application of High-concentration Bentonite Slurry in Large-diameter Crossing River Pipe Jacking Project

传统的膨润土泥浆在大口径、长距离、粉砂地质条件顶管工程中具有一定的局限性,具体表现为:大口径顶管顶部泥浆缺失,复顶后顶力激增以及下坡顶进时泥浆积聚在机头底部。介绍在传统的膨润土泥浆基础上,增设一种高浓度膨润土泥浆来解决上述问题,经实际工程应用取得了良好的效果。详细介绍了高浓度膨润土泥浆的配比以及特性。随后,阐述了其在工程中的应用价值,最后讨论了该泥浆自身缺陷。

The traditional bentonite slurry has a certain limitation in the long-distance pipe jacking projects under the silt geological condition, mainly showing that the slurry is deficient at the top of large-diameter jacking pipe, the jacking force increases sharply after the repeated jacking, and the slurry is accumulated at the bottom of machine head when downgrading jacking. On the basis of the traditional bentonite slurry, a high-concentration bentonite slurry is added to solve the above problems. The good effect is achieved after the practical engineering application. The article introduces the proportion and characters of high-concentration bentonite slurry in detail, then sets forth its application value in the projects, and finally discusses itself defect of this slurry.