地下连续墙成槽泥浆试验研究与应用  

Experimental Research and Application of Grooving Slurry for Diaphragm Wall

作　　者：王宇 WANG Yu

机构地区：[1]上海远方基础工程有限公司,上海市200436

出　　处：《城市道桥与防洪》2024年第12期253-257,261,M0021,M0022,共8页Urban Roads Bridges & Flood Control

摘　　要：地下连续墙施工受膨润土泥浆影响极大,膨润土泥浆的质量控制是地下连续墙成槽中槽壁稳定性保证的关键。膨润土泥浆的质量主要受膨润土种类、制浆用水质量以及膨润土掺量的影响。基于苏州某项目地下连续墙围护工程,对该工程泥浆进行试验研究。首先,对该地区井水、自来水制浆进行泥浆性能对比,选取了山东潍坊驸马营钠土粉、辽宁黑山中粉、辽宁黑山高粉3种膨润土进行制浆试验,确定该地区在3%膨润土掺量下井水制浆无法满足成槽要求;然后,选取5个厂家的膨润土进行不同掺量下膨润土井水制浆试验,检测并记录了各掺量下膨润土泥浆充分水化24 h后的比重、黏度参数以及8~48 h内的胶体率变化情况;最终确定了7%掺量的浙江安吉超润膨润土进行泥浆施工,并在当前的13幅地下连续墙施工中有效使用。The construction of diaphragm wall is greatly affected by bentonite slurry.The quality control of bentonite slurry is the key to ensure the stability of the groove wall during the grooving of diaphragm wall.The quality of bentonite slurry is mainly affected by the type of bentonite,the quality of water used for making slurry,and the mixing amount of bentonite.Based on a diaphragm wall enclosure project in Suzhou,the slurry of the project is studied experimentally.Firstly,the performances of slurry produced by the well water and tap water in the region are compared.Three kinds of bentonites such as sodium earth powder in Fumaying Area of Weifang in Shandong Province,medium powder and high powder in Heishan County in Liaoning Province are selected for the slurry making tests.It is determined that the well water slurrying with 3%bentonite content could not meet the requirements of grooving.Then,five manufacturers of bentonite are selected for the well water slurrying experiments with the different amounts of bentonite.The specific gravity,viscosity parameters,and colloid fraction changes in 8~48 h are measured and recorded after the bentonite slurry is fully hydrated for 24 h with the different amounts.Finally,7%of Zhejiang Anji super-moist bentonite is determined for slurry construction,which has been effectively used in the current construction of 13 diaphragm walls.

关 键 词：地下连续墙 膨润土泥浆 膨润土掺量 泥浆性能 试验 

分 类 号：TU473.2[建筑科学—结构工程]