膨胀土地基的工程勘察与评价  

Geotechnical investigation and evaluation of expansive soil

作　　者：刘长青[1] 姚宾科[1] 

机构地区：[1]北京市勘察设计研究院有限公司,北京100038

出　　处：《工程勘察》2017年第9期11-16,共6页Geotechnical Investigation & Surveying

摘　　要：膨胀土是一种特殊性土,本文通过介绍斐济共和国维提岛的工程勘察实例,阐明了膨胀土地基工程勘察的特点。通过钻探、原位测试、室内试验分析等手段获得了膨胀土地基的工程性质,针对地基土的特殊性质,分析地基土的矿物成分、颗粒组成,并进行了自由膨胀率、膨胀力及收缩等试验,根据土壤的物理指标、力学指标确定了大气影响深度,依据计算的地基胀缩变形量采用调整基础砌置标高的天然地基方案,以期对类似工程条件的勘察工作起到借鉴作用。Expansive soil is a kind of special soil. Through the introduction of an investigation works in the Republic of Fiji Viti Levu, the characteristics Of expansive soil geotechnical investigation is illustrated.The engineering properties of expansive soil are obtained by drilling, in-situ and laboratory testing. Considering the special properties of the expansive soil, the mineral and grain composition is analyzed, and the free swelling ratio, swelling force and coefficient of shrinkage is tested. According to the physical and mechanical parameters, the climate influencing depth is determined. The Shallow foundation detail is adjusted based on the value of the swelling-shrinkage deformation. The method of the investigation could be referred in similar projects.

关 键 词：膨胀土 粘土矿物 大气影响深度 胀缩变形量 胀缩等级 

分 类 号：TU47[建筑科学—结构工程]