摘要
为研究不同颗粒组构黄土的压缩特性,取五个不同地区的黄土过0. 075 mm筛以制作固结试样,通过压缩固结试验,揭示颗粒组构对黄土的压缩指数、压缩模量的影响规律,以及时间-变形和应力-应变的发展规律。再结合骨架孔隙比的概念,从微观结构的角度解释颗粒组构对黄土压缩特性的影响。试验结果表明:黄土颗粒组构中的黏粒含量对其压缩性有显著影响,随着黏粒含量的增加,黄土的压缩系数增大,压缩指数也增大,压缩模量随黏粒含量的增加而减小,且在黏粒含量20%左右急剧变化;随着黏粒含量增加,黄土试样的变形量相对增大,变形达到稳定的时间也相对较长;黏粒含量对低应力水平下的应力-应变关系影响较大,黏粒含量越高,应变随应力的增加而增长越快。用粉粒间孔隙比es表示骨架孔隙比,黏粒含量越高,黏粒在粉粒间赋存位置更复杂,对骨架孔隙比的影响越大。
To study the compression characteristics of the loess with different particles,different loess in five regions were screened by 0.075 mm to make the consolidation samples.Through the laterally confined compression tests,the influence of the particle composition on the compression index and compression modulus of the loess and the development law of time-deformation and stress-strain were revealed.Combined with the concept of skeleton void ratio,the effect of particle composition on the compression characteristics of loess was explained from the perspective of microstructure.The results show that the content of clay particles in the loess particle composition has a significant influence on its compressibility.With the increase of clay content,the compression coefficient of the loess increases and the compression index increases.The compressive modulus decreases with the increase of clay content,and changes sharply at about 20%of the clay content.As the content of clay increases,the deformation of the loess specimen increases relatively and the deformation reaches a relatively long time.The clay content has a great influence on the stress-strain relationship under low stress level,and the higher the clay content,the faster the strain increases with the increase of stress.The skeleton void ratio was represented by the void ratio in silt,clay in the location of silt is more complex with the more content of clay,and it has more influence of skeleton void ratio.
作者
简涛
李喜安
王力
张晨
JIAN Tao;LI Xi-an;WANG Li;ZHANG Chen(School of Geological Engineering and Geomatics,Chang an University,,Xi an 710054,China;Open Research Laboratory of Geotechnical Engineering,Ministry of Land and Resources,Chang an University,Xi'an 710054,China)
出处
《科学技术与工程》
北大核心
2018年第30期212-219,共8页
Science Technology and Engineering
基金
国家自然科学基金(41572264,41877225,41172255)资助.
关键词
颗粒组构
压缩固结试验
黏粒含量
骨架孔隙比
particle structure
compression consolidation test
clay content
skeleton void ratio
作者简介
第一作者:简涛(1993—),男,硕士。研究方向:黄土工程地质及地质灾害防治。E-mail:1367912617@qq.com;通信作者:李喜安(1968—),男,教授,博士研究生导师。研究方向:黄土工程地质灾害。E-mail:dclixa@chd.edu.cn。
