低荷载作用下洛川黄土的湿陷性试验研究  

Experimental Study on Collapsibility of Luochuan Loess under Low Load

作　　者：王宇 刘海松[1] 黄绵松 许墨陶 刘魁 WANG Yu;LIU Hai-song;HUANG Mian-song;XU Mo-tao;LIU Kui(Geological Engineering and Surveying Institute, Chang'an University, Xi'an 710000, China;Ningxia Capital Sponge City Construction & Development CO. ,LTD,Guyuan 756000,China;Research Institute of Electronic Comprehensive Survey of the Ministry of Information Industry, Xi'an 710000, China)

机构地区：[1]长安大学地质工程与测绘学院,西安710000 [2]宁夏首创海绵城市建设发展有限公司,固原756000 [3]信息产业部电子综合勘察研究院,西安710000

出　　处：《科学技术与工程》2019年第35期310-316,共7页Science Technology and Engineering

基　　金：陕西重点研发计划(2017ZDXM-SF-087);宁夏首创海绵城市建设发展有限公司项目(SCHM-2018-03)资助

摘　　要：黄土的湿陷性问题是黄土地区工程建设中的热点问题,一直困扰着研究及设计人员。不同区域、不同工况下黄土的结构差异较大,湿陷程度区别大,且受水的影响最敏感。为了进一步研究黄土湿陷的结构水敏性,设计并进行了一系列室内试验,实验结果表明:①黄土的结构强度随其含水率增加而有规律的降低,初始结构强度呈线性变化,后期加固结构强度呈非线性变化,含水率在6%~12%区间内对黄土的后期加固结构强度的影响较为强烈;②在低载荷条件下,原状黄土存在“含水率在天然含水率附近时,土样的湿陷性最大”这一现象,重塑黄土和高荷载下的原状黄土的湿陷性皆随着含水率的增加而降低;③原状与重塑黄土的湿陷系数差值的变化趋势与土样后期加固结构强度对含水率变化的敏感程度呈正相关关系。研究结果对于黄土湿陷的结构水敏性的试验研究和工程建设具有一定的指导意义。Loess collapsibility problem is a hot topic in the construction of the loess area, it has been plagued research and design staff. In different regions, under different working conditions, the structure of loess is quite different, the degree of collapsibility is also different, which are the most sensitive by the impact of water. In order to further study the structural water sensitivity of loess collapsibility, a series of laboratory tests were designed and carried out. The experimental results show these as follows. ①The structural strength of loess decreases regularly with the increase of water content, and the initial structural strength changes linearly. The strength of the later-reinforced structure changes nonlinearly. The water content in the interval of 6%~12% has a strong influence on the strength of the later reinforcement structure of loess. ②Under low load conditions, the undisturbed loess has the phenomenon that the soil sample has the largest collapsibility when the water content is near the natural water content. The collapsibility of remodeled loess and undisturbed loess under high load decreases with increasing water content. ③The change trend of the difference of the collapsibility coefficient between the undisturbed loess and remolded loess is positively correlated with the sensitivity of the strength of the later reinforcement structure to the change of water content. It can be seen that the research results have certain guiding significance for the experimental research and engineering construction related to loess collapsibility.

关 键 词：黄土 结构强度 湿陷性 水敏性 

分 类 号：TU444[建筑科学—岩土工程]