土-聚合物改性膨润土阻隔墙材料和易性研究  

Study on workability properties of polymer modified bentonite as cutoff wall materials

作　　者：姜璐莎 代展鸿 蒲诃夫[1,2] 董晓强 JIANG Lusha;DAI Zhanhong;PU Hefu;DONG Xiaoqiang(School of Civil and Hydraulic Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;School of Civil Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]华中科技大学土木与水利工程学院,湖北武汉430074 [2]太原理工大学土木工程学院,山西太原030024

出　　处：《华中科技大学学报（自然科学版）》2024年第10期1-6,26,共7页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家重点研发计划资助项目(2019YFC1806000);国家自然科学基金资助项目(52078235)。

摘　　要：采用钠化钙基膨润土和自主研发的聚合物改性钠化钙基膨润土,分析了膨润土掺量和膨润土种类对膨润土浆液及回填料工程特性的影响规律.试验结果表明:通过对不同膨润土掺量下膨润土浆液施工和易性4种参数(pH值、泥浆密度、马氏漏斗黏度和滤失量)的测定,确定了钠化钙基膨润土浆液和聚合物改性膨润土浆液满足施工和易性要求的膨润土掺量分别为10.4%和7%.根据迷你坍落度筒试验,确定了当满足施工和易性要求时,两种竖向阻隔墙材料的适宜含水率区间及控制含水率.土-聚合物改性膨润土回填料的适宜含水率受回填料液限变化的影响更小,更容易在低掺量和低含水率条件下满足施工和易性的要求.The effects of bentonite content and type on engineering properties of bentonite slurry and backfill were analyzed using Na-activated Ca-bentonite bentonite(Na-CaB) and self-developed polymer-modified bentonite(PMB).Experiment results show that 10.4% and 7% bentonite contents can achieve the workability requirement for Na-CaB slurry and PMB slurry,respectively,according to the influence of bentonite content on the properties(i.e.,pH,density,Marsh funnel viscosity and filtration) of bentonite slurry.PMB backfill is easier to meet workability requirements using lower bentonite content and lower water content,as the required water content is less interfered by the changes in liquid limit.According to the mini-slump tests,a range of water content and a controlled water content are determined for two types of backfill material of the vertical cutoff wall for meeting workability requirements.PMB backfill is easier to meet workability requirements using lower bentonite content and lower water content,as the required water content is less interfered by the changes in liquid limit.

关 键 词：和易性 竖向阻隔墙 膨润土 聚合物改性膨润土 坍落度 

分 类 号：TU443[建筑科学—岩土工程]