粗颗粒盐渍土溶陷特性试验研究  

Experimental study on salt resolving slump of coarse-grained salty soil

作　　者：程东幸[1] 刘志伟[1] 张希宏[1] 

机构地区：[1]中国电力工程顾问集团西北电力设计院,西安710032

出　　处：《工程勘察》2010年第12期27-31,共5页Geotechnical Investigation & Surveying

摘　　要：随着新一轮西部大开发的顺利推进,西北地区大规模的基础建设全面开展,众多工程的地基基础都面临粗颗粒盐渍土的工程难题。由于目前关于盐渍土的研究对象还限于细粒土,没有成熟的粗颗粒盐渍土工程性能分析的成熟思路,因此,给该地区的工程建设带来了重大挑战。本文选择河西走廊西段典型粗颗粒盐渍土场地进行了浸水溶陷试验,结果显示:粗颗粒盐渍土溶陷的本质不仅是含盐量和含水量的问题,粗颗粒含量、地基土密实性及渗透系数等都是影响地基土溶陷的重要因素。本文同时认为,开展含盐量界定方法研究和溶陷性评价公式的建立是粗颗粒盐渍土急待开展的课题。In Northwest China,most engineering projects are facing the problems from coarse-grained salty soil,but still now,most of the research results about saline soil mainly focused on the fine-grained soil,there is no mature system to analyze the engineering performance of coarse-grained salty soil,which brings the great challenge to the local engineering construction.In order to understand the nature of salt resolving slump,the typical site for coarse-grained salty soil in the west section of Hexi corridor is selected to make the testing.The results show that the feature of the salt resolving slump of coarse-grained salty soil is not only the salinity and water content,but also the proportion of coarse particles,the density and permeability coefficient of foundation soil.It is proposed that the study on the salinity quantified process and the development of the evaluation formulae for salt resolving slump are very important.

关 键 词：粗粒盐渍土 浸水试验 溶陷性评价 

分 类 号：TU448[建筑科学—岩土工程]