新型水玻璃-酯类注浆材料及其固沙体特性研究  

Study on new sodium silicate-ester grouting material and its properties of grouted-sand

作　　者：荣驰 陈卫忠[1,3] 袁敬强[1] 张铮 张毅 张庆艳[1,2] 刘奇 RONG Chi;CHEN Wei-zhong;YUAN Jing-qiang;ZHANG Zheng;ZHANG Yi;ZHANG Qing-yan;LIU Qi(State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China;University of Chinese Academy of Sciences,Beijing 100049,China;Geotechnical and Structural Engineering Research Center,Shandong University,Jinan,Shandong 250061,China;Road&Bridge International Co.,Ltd.,Beijing 100084,China;Zichengmao(Shanghai)Engineering Technology Co.,Ltd.,Shanghai 200050,China)

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,湖北武汉430071 [2]中国科学院大学,北京100049 [3]山东大学岩土与结构工程研究中心,山东济南250061 [4]中交路桥建设有限公司,北京100084 [5]梓承茂(上海)工程技术有限公司,上海200050

出　　处：《岩土力学》2020年第6期2034-2042,共9页Rock and Soil Mechanics

基　　金：湖北省创新群体研究项目(No.2018CFA012);国家自然科学基金面上项目(No.51879258)。

摘　　要：针对风积沙边坡稳定性差和常用加固技术存在成孔困难、加固范围有限等问题,提出以二元酸酯为固化剂的新型水玻璃-酯类浆液对风积沙进行加固的思路。采用倒杯法和旋转黏度计对新型水玻璃-酯类浆液的凝胶时间、黏度时变性进行了系统测试,并通过三轴试验研究不同浆液填充率对固沙体强度和渗透性的影响规律。研究表明:新型水玻璃-酯类浆液凝胶时间在20 s^60 min之间,浆液黏度随时间增长呈现指数型增长变化,且凝胶之前黏度低;当浆液填充率从0%增加至100%,固沙体黏聚力由0kPa线性增加至148.4 kPa,内摩擦角按抛物线变化规律从32.1°增加至37.8°,渗透系数从3.42×10^-5 cm/s降低到8.74×10^-7 cm/s;与水玻璃-磷酸浆液、水玻璃-硫酸浆液相比,新型水玻璃-酯类浆液固沙体抗压强度高。该研究结果为风积沙边坡加固提供了新的方法。In view of the poor stability of aeolian sand slope and the problems such as difficult hole-forming and limited reinforcement in commonly used reinforcement technologies,the new sodium silicate-ester slurry with binary acid ester as curing agent is proposed to reinforce aeolian sand.The gel time and the time-varying behavior of viscosity of new sodium silicate-ester slurry are systematically tested by inverted cup method and rotational viscometer respectively.The influences of different slurry filling rates on the strength and permeability of grouted-sand are studied by triaxial test.The results show that the gel time is between 20 s and 60 min.The viscosity of the slurry increases exponentially with time and the viscosity is low before gelation.When the slurry filling rate increases from 0%to 100%,the cohesion of grouted-sand increases linearly from 0 kPa to 148.4 kPa,and the internal friction angle increases from 32.1°to 37.8°according to the parabolic law,and the permeability coefficient decreases from 3.42×10^-5 cm/s to 8.74×10^-7 cm/s.Comparing with sodium silicate-phosphoric acid slurry and sodium silicate-sulfuric acid slurry,the compressive strength of grouted-sand reinforced by new sodium silicate-ester slurry is higher.The research results of this paper provide a new method for the reinforcement of aeolian sand slope.

关 键 词：风积沙边坡 新型水玻璃-酯类浆液 凝胶时间 黏度时变性 加固效果 

分 类 号：TU472[建筑科学—结构工程]