水泥潜入水头对基质阻渗作用的影响研究

摘要

Based on simulation infiltration test of cement sneaking into soil matrix at different effective water heads,the influence of different effective water heads and content of cement sneaking into soil matrix on permeability function of soil matrix was analyzed. The result shows that different effec-tive water heads and the cement of additives exert an influence on infiltration capacity of matrix and the greater water head or the content of cement added,the more obvious impervious effect. The different cement of additives has different influence on the porosity and pore space status. The larger the amount of plunge is,the smaller the porosity will be and the lower the hydraulic conductivity is,but the process is limited. Under the equality ce-ment of additives,the rate of infiltration rapidly decreases at the early water supply,and the rate of infiltration tend to stable gradually at the late water supply,but the higher water head is,the shorter the stability time will be. The water head of cement have much effect on permeability function of soil matrix than the content of cement sneaking into soil matrix.%基于不同水头条件下水泥颗粒潜入河床基质的模拟入渗试验，分析了不同水头条件下水泥潜入河床基质对其入渗能力的影响和不同水泥潜入量对基质入渗能力的影响，结果表明：水泥潜入水头和潜入量对基质阻渗能力都有较大影响，且水泥潜入水头和潜入量越大，基质的阻渗作用越明显；不同水泥潜入量对基质孔隙率和孔隙状况的影响不同，潜入量越大孔隙率越小，水力传导能力越低，但这个过程是有限的；相同水泥潜入量下，供水前期入渗率迅速减小，后期入渗率逐步趋于稳定，但稳定时间随水泥潜入水头的增大而缩短；水泥的潜入水头对基质入渗能力的影响略大于水泥潜入量对基质入渗能力的影响。