长江科学院院报2019，Vol.36Issue(4)：32-38,7.DOI:10.11988/ckyyb.20180867
含水率变化对荆江河岸黏性土体力学特性的影响
Influence of Water Content Variation on Mechanical Properties of Riverbank Cohesive Soil of Jingjiang River Reach
摘要
Abstract
Bank retreat is affected by the physical and mechanical properties of riverbank soil as a major factor. To research the influence of water content on the mechanical properties of riverbank soil of Jingjiang River reach, the composition and mechanical properties of soils on Jingjiang riverbank were examined in a holistic sense via data a-nalysis, indoor test and theoretical analysis; moreover, the effect of water content variation on the shear strength in-dicators of cohesive soil on Jingjiang riverbank and further on the riverbank stability was quantified using measured data of 2016. Eight typical bank retreat sections were sampled in 2017. Results suggest that the soil composition in the Jingjiang River reach is characterized by a typical composite structure involving cohesive upper layer and non-cohesive lower layer. With the augment of water content, cohesion of soil increased first and then decreased, while internal friction angle reduced continuously. In general, higher content of cohesive particles leads to greater peak value of cohesion. In addition, the formulae between water content and shear strength indicators are given. The sta-bility of riverbank in dry season is fairly good, larger than that in rising stage; but in flood season and recession stage, riverbank stability is undesirable.关键词
黏性土/含水率/力学特性/荆江/河岸稳定性Key words
cohesive soil/ water content/ mechanical properties/ Jingjiang River/riverbank stability分类
建筑与水利引用本文复制引用
刘昭希,王军,宗全利,周银军..含水率变化对荆江河岸黏性土体力学特性的影响[J].长江科学院院报,2019,36(4):32-38,7.基金项目
国家自然科学基金国际合作与交流项目(41661134012) （41661134012）
