摘要
为了了解长沙粉质黏土的结构性,人工制备了5种含水量分别为10%、16%、22%、28%和饱和的原状土和重塑土,进行了一维固结试验。结果表明:水分的增加破坏了土中的结构连接,改变了土粒的性质,导致土的压缩系数增大,压缩模量减小,回弹指数减小,原状土的抗压缩能力大于重塑土的抗压缩能力。采用3次多项式模型和还原曲线模型,得到了原状土的结构屈服压力、先期固结压力和结构强度,含水量的增加导致结构性指标逐渐减小,前期减小速率较大,后期减小速率变缓,通过拟合含水量与结构性指标的关系式,对地基沉降提供计算依据。
To study the structure of reticulated red clay in Changsha, the undisturbed clay and remolded clay are prepared by 5 different water contents of 10%、16%、22%、28% and saturation, and the one-dimensional tests are carried out. The results show that the increase of water contents destroies the structural connection in soil and changes the properties of soil particles, leading to the increase of the compression coefficients, the decrease of compression modulus and rebound indexes of soil. The compressive resistance of undisturbed soil is greater than that of remolded soil. The structural yield pressure, pre-consolidation pressure and structural strength of undisturbed soil are calculated by using the cubic polynomial model and the reduction curve model. The increase of water content leads to the decrease of structural indicators, the decrease rate is large at the early stage and slow at the later stage.By fitting the relationship between water content and structural indexes, the foundation for calculating foundation settlement is provided.
作者
孙政
何振华
陈宗辉
陈永青
夏艳波
任睕遐
Sun Zheng;He Zhenhua;Chen Zonghui;Chen Yongqing;Xia Yanbo;Ren Wanxia(School of Civil Engineering, Central South University of Forestry and Technology, Changsha 410004,China)
出处
《湖南文理学院学报（自然科学版）》
CAS
2019年第3期64-70,共7页
Journal of Hunan University of Arts and Science(Science and Technology)
基金
湖南省重点学科建设项目(2013ZDXK006)
中南林业科技大学引进高层次人才科研启动基金项目(104G0094)
中南林业科技大学现代木结构工程材制造及应用技术湖南省工程实验室开放基金项目(HELFMTS1707)
关键词
粉质黏土
原状土
结构性
结构屈服压力
先期固结压力
reticulated red clay
undisturbed soil
structure
structural yield pressure
pre-consolidation pressure
