基于单、双线法的冀南地区黄土湿陷性评价试验研究  

Experimental Study on Evaluation of Loess Subsidence in Southern Hebei Area Based on Single and Double-Oedometer Methods

作　　者：苗雷强 MIAO Lei-qiang(Hebei Academy of Building Research,Shijiazhuang,Hebei 050000;Hebei Building Research Technology Co.,Ltd.,Shijiazhuang,Hebei 050000)

机构地区：[1]河北省建筑科学研究院,河北石家庄050000 [2]河北建研科技有限公司,河北石家庄050000

出　　处：《河北地质大学学报》2018年第5期44-47,共4页Journal of Hebei Geo University

基　　金：国家自然科学基金项目(51478279)

摘　　要：黄土的湿陷性对于工程建设的安全有较大影响,目前对于黄土湿陷性的评价,采用不同试验方法所得的湿陷系数存在明显差异,对于评价黄土湿陷性的试验方法的研究尤为重要。论文以冀南地区湿陷性黄土为研究对象,通过单、双线法试验,探究采用该两种试验方法评价黄土湿陷性产生差异的原因及各自的适用范围。试验结果表明:单、双线法所得的湿陷系数均随含水率的增大而减小;当含水率较低时,单线法湿陷曲线明显高于双线法曲线;当含水率增大时,该两种方法的湿陷曲线出现相交;当含水率进一步增大时,单线法湿陷曲线将小于双线法湿陷曲线。考虑工程的安全性,建议:当含水率较低时,宜选用单线法评价黄土的湿陷性;当含水率较高时,宜选用双线法评价黄土的湿陷性。Loess subsidence has a great influence on the safety of engineering construction, at present, there are significant differences in the wet subsidence coefficient obtained by different test methods for the evaluation of loess subsidence, it is very important to study which test method is used to evaluate the loess humidification. In this paper, we study the causes and application of the two test methods to evaluate the difference of the loess humidification through single and double-oedometer methods. The experimental results show that the wet subsidence coefficient of single and double-oedometer methods decreases with the increase of water content, when the water content is low, the wet subsidence curve of single-oedometer test method is higher than that of double-oedometer test method. When the water content increases, the wet subsidence curves of the two methods intersect. When the water content increases further, the single-oedometer wet subsidence curve will be smaller than the double-oedometer wet subsidence curve. Considering the safety of the project, it is suggested that when the water content is low, it is advisable to use a single-oedometer method to evaluate the wet subsidence of loess; when the water content is large, it is advisable to use the double-oedometer method to evaluate the wet subsidence of loess.

关 键 词：湿陷性黄土 单线法 双线法 含水率 湿陷系数 

分 类 号：TU43[建筑科学—岩土工程]