【摘要】 为研究斥水土渗透性能变化规律，本文采用硬脂酸作为斥水剂，获得不同斥水程度的斥水黏土。在此基础上，采用恒压式渗透仪，开展不同初始含水率、硬脂酸含量、击实次数条件下的渗透试验，分析斥水黏土的起渗历时、稳定导水率的变化规律。结果表明：硬脂酸含量与击实次数是影响斥水黏土斥水性的重要因素。稳定导水率与硬脂酸含量、初始含水率呈正相关，与击实次数呈负相关。硬脂酸改性后黏土的稳定导水率由10^-4 cm/s降至10^-5 cm/s，表明其抗渗性能有显著提高。方差分析结果表明，试样初始含水率、硬脂酸含量及击实次数均会对试样的稳定导水率产生显著影响，模型决定系数为0.979。极差分析结果表明，各影响因素对于稳定导水率影响程度的大小顺序为：初始含水率>击实次数>硬脂酸含量。硬脂酸改性黏土的最差水平组合为含水率0%、硬脂酸含量1%、击实次数28次，最优水平组合为含水率15%、硬脂酸含量2.5%、击实次数16次。研究成果可为相关防渗工程应用提供参考。更多还原

【Abstract】 To obtain the change rule of permeability of water repellent soil, the water-repellent clays with different levels of water repellent were obtained modifed by stearic acid. On this basis, the permeability tests under different initial water content, stearic acid content and compaction times were carried out by using a constant pressure permeameter. The changes of seepage duration and stable hydraulic conductivity of water-repellent clay were analyzed. The results indicate the content of stearic acid and the compaction times are important factors affecting the water repellency of water repellent clay. The stable hydraulic conductivity is positively correlated with stearic acid content and initial water content, and negatively correlated with compaction times. The stable hydraulic conductivity of clay modified by stearic acid was decreased from 10^-4 cm/s to 10^-5 cm/s, which means its impermeability was significantly improved. The results of variance analysis shown that the initial water content, stearic acid content and compaction times all had significant effects on the stable water conductivity of the sample, and the coefficients of determination of the model was 0.979. The range analysis results shown that the effect of the influencing factors on the stable water conductivity was: initial water content > compaction times > stearic acid content. The worst level combination of modified clay was water content 0%, stearic acid content 1%, compaction times 28 times, and the best level combination was water content 15%, stearic acid content 2.5%,compaction times 16 times. The results can provide reference for the application of relevant anti-seepage engineering.更多还原