宁夏同心重塑黄土的触变特性  

Thixotropic characteristics of remolded loess in Tongxin County, Ningxia

作　　者：崔自治[1] 周伟红[1] 潘鹏[1] 李剑[1] 

机构地区：[1]宁夏大学土木与水利工程学院,银川750021

出　　处：《水力发电学报》2016年第6期111-117,共7页Journal of Hydroelectric Engineering

基　　金：教育部"长江学者和创新团队发展计划"创新团队项目(IRT1067)

摘　　要：针对重塑黄土存在触变性问题,以含水率、干密度和氯化钙含量为因素,设计正交试验方案L16（45）,试验研究了宁夏同心重塑黄土的触变性,分析作用规律和机理,建立了触变性与各试验因素的关系模型。试验结果表明：含水率在8%～14%范围内,触变性参数随着龄期的增加而增加,初期增加快、后期增加缓慢,14 d基本趋于稳定,可以14 d作为重塑黄土的强度稳定时间;含水率、干密度和氯化钙对黄土的触变性均有显著影响,影响的重要性顺序为含水率、干密度、氯化钙含量;建立的触变性参数模型显著,与含水率、干密度、氯化钙和龄期等因素的相关性好,预测值可信。研究结果对重塑黄土地基设计、评价具有重要意义。Orthogonal test scheme L16（45） was designed in this study using three factors of water content, dry density, and calcium chloride content, to conduct an experimental study on the thixotropy of remolded loess in Tongxin Conty, Ningxia. Based on the measurements and analysis, we derived an empirical formula for calculation of the thixotropy from these factors. Our experimental results show that in the water content range of 8-14%, the thixotropy parameter increases with the increase of age. It is increasing at a high rate initially and then a lower rate, and tends to be stable after 14 days, a period independent of the other two factors. Hence, this age can be used as the strength growing age of remolded loess. All the three factors are significant and by effect they are ordered as water content, dry density, and calcium chloride content. The analysis reveals that the measured thixotropy has a good correlation with the age and each of the factors, and that our formula has a good accuracy and can make reliable predictions. Thus, the results would provide useful information for design and evaluation of remolded loess foundation.

关 键 词：岩土工程 触变性 重塑黄土 可溶盐 

分 类 号：TU43[建筑科学—岩土工程]