土石混合体注浆扩散机制及影响因素试验研究  

Experimental study on grouting diffusion mechanism and influencing factors of soil-rock mixture

作　　者：钟祖良[1,2] 别聪颖 范一飞 刘新荣[1,2] 罗亦琦 涂义亮[1,3] ZHONG Zu-liang;BIE Cong-ying;FAN Yi-fei;LIU Xin-rong;LUO Yi-qi;TU Yi-liang(School of Civil Engineering,Chongqing University,Chongqing 400045,China;National Joint Engineering Research Center of Geohazard Prevention in Reservoir Area,Chongqing University,Chongqing 400045,China;School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]重庆大学库区环境地质灾害防治国家地方联合工程研究中心,重庆400045 [3]重庆交通大学土木工程学院,重庆400074

出　　处：《岩土力学》2019年第11期4194-4202,共9页Rock and Soil Mechanics

基　　金：国家重点研发计划（No.2018YFC1504802）;国家自然科学基金项目（No.51808083）;重庆市基础研究与前沿探索项目（No.cstc2018jcyjAX0491）~~

摘　　要：为了研究浆液在土石混合体中的扩散机制及其影响因素,以重庆地区土石混合体为研究对象,研制了一套可重复使用的室内注浆模型试验系统,开展了不同含石量、孔隙比、浆液黏度和注浆压力等条件下土石混合体注浆模型试验研究。研究结果表明:浆液在土石混合体中主要以渗透、劈裂的方式扩散。当含石量由低到高变化时,浆液主要扩散方式由劈裂扩散转化为渗透扩散;中等含石量时,劈裂扩散与渗透扩散相当。在试验的基础上,结合支持向量机制论建立了土石混合体注浆扩散半径预测模型,并基于该模型的计算结果,获得了渗透扩散半径和劈裂扩散半径影响因素的影响次序分别为:含石量>浆液黏度>孔隙比>注浆压力、含石量>注浆压力>浆液黏度>孔隙比。含石量对扩散形式的影响最大,对扩散半径值的影响占主导地位,建议实际工程中应根据土体含石量分区段进行注浆技术参数设计。In order to study the diffusion mechanism of slurry in soil-rock mixture and its influencing factors, a reusable indoor grouting model test system was developed with the Chongqing soil-rock mixture as the research object. Experimental study of grouting model of soil-rock mixture under conditions of different stone contents, porosities, slurry viscosities and grouting pressures was carried out. The results show that slurry diffuses mainly in the soil-rock mixture by means of osmotic and splitting. When the stone content increases, the main diffusion mode of the slurry shifted from splitting to osmotic. When the medium contains stone, the splitting diffusion is equivalent to the osmotic. On the basis of experiments, the grouting diffusion radius prediction model of soil-rock mixture is established based on the theory of support vector machine. Based on the calculation results of the model, the order of influencing factors for the infiltration diffusion radius and the splitting radius are obtained respectively. Which are: stone content>slurry viscosity>porosity> grouting pressure;stone content> grouting pressure>slurry viscosity>porosity. The stone content has the greatest influence on the diffusion form, and it domains the diffusion radius value. It is suggested that the engineering should design the grouting parameters according to the stone content.

关 键 词：土石混合体 含石量 扩散机制 预测模型 影响因素 

分 类 号：TU443[建筑科学—岩土工程]