静水条件下浆液粘度时变特性与微观结构研究  

Micro-structure and Time-varying Characteristic of Cement-sodium Silicate Grout under Still Water

作　　者：袁敬强[1] 陈卫忠[1,2] 于建新[3] 郑朋强[1] 杨帆[1] 

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,武汉430071 [2]山东大学岩土与结构工程研究中心,济南250061 [3]河南理工大学土木工程学院,河南焦作454000

出　　处：《地下空间与工程学报》2016年第5期1264-1270,共7页Chinese Journal of Underground Space and Engineering

基　　金：国家重点基础研究发展计划(973)项目(2013CB036006);国家自然科学基金杰出青年基金项目(51225902;51509246;51379007);河南省教育厅高等学校重点科研项目(16A440008)

摘　　要：浆液的凝胶特性是影响注浆效果的关键因素,为研究浆液的粘度变化过程与凝胶特性、揭示凝胶产物的微观结构特征,采用旋转粘度计对浆液在静水及无水条件下的凝胶变化过程进行系统试验,并采用SEM扫描电子显微镜对凝胶产物微观结构进行分析。研究结果表明,浆液在水下粘度变化具有明显的时变特性,粘度变化过程可分为低粘度期、初始上升期和快速上升期三个阶段,静水条件下低粘度期比无水条件下明显延长,使得浆液更容易被分散冲蚀。通过对凝胶产物微观结构分析表明,浆液凝胶分层具有不同的微观结构,静水条件下凝胶较无水条件下微孔隙含量更高,结构更为松散。研究成果丰富了注浆理论并可为优化注浆工艺提供参考,具有一定的理论价值及工程意义。In tunnelling and underground engineering,there always exist challenges of water blockage and ground stabilization. Grouting technique is widely used to control seepage,increase strength and lessen the deformability of formations in underground engineering. And the gelling property of grout significantly influences the sealing and strengthening effect. This study carries out the viscosity test to evaluate the time-varying characteristic of viscosity and gelling process of grouting. Additionally,the microstructure scanning of the gel is carried out to reveal the microstructure of grout gel under different conditions. The time-varying characteristic of viscosity of the grout with different proportioning under water is studied by using the NDJ-5S rotational viscometer. And the changing process of viscosity of the grout in the water can be divided into three stages,which is low-viscosity stage,initially increasing stage,and quick increasing stage,respectively. The low-viscosity stage of grout under water is much longer than mixture that directly mixed,which means the grout is more likely to be diluted and washed out by the water. Further on,the microstructure of grout gel is characterised by using scanning electron microscope（ SEM）,and the microstructure of the grout gel under different conditions is revealed. The SEM scanning result shows that the grout gel has different microstructure under water with directly mixed condition. This research enriches the underwater grouting theory and provides references for the optimization of the grouting technique,and has a significance on the grouting theory and practical engineering.

关 键 词：注浆 速凝浆液 水泥水玻璃 静水条件 时变特性 微观结构 

分 类 号：TU93[建筑科学—结构工程]