岩土力学2017，Vol.38Issue(6)：1550-1556,7.DOI:10.16285/j.rsm.2017.06.002
细颗粒流失对砂砾石土本构关系的影响研究
Effect of fine grain loss on the stress-strain relationship of sand and gravel soils
摘要
Abstract
Sand and gravel soils in a dam foundation with a suspended cutoff wall may lead to fine grains loss due to the effect of suffusion,which further results in the reduction of strength and deformation modulus.As a result,the cutoff wall and the dam above the foundation experience an adverse impact.The effect of loss amount of fine particles on the stress-strain relationship of soil is known as one of preconditions to quantitatively assess the impact.In this study,an experimental program was presented to study the constitutive model.Triaxial and confined compression tests were conducted to investigate the effect of the loss amount of fine particles on the strength and stress-strain relations of sand and gravel soils.It is found that stress-strain characteristics of soil are not influenced by fine grain loss,but both the strength and deformation modulus are decreased.By establishing the relationship between model parameters and the amount of the loss,a single model was utilized to describe the stress-strain relationships of sand and gravels with spatio-temporal changes of particle loss amount.Based on Duncan E-B model,we proposed an expression to quantitatively describe the relationship between the loss amount of fine particles and the stress-strain of the soil,and parameters of the constitutive model were given as well.关键词
潜蚀/细颗粒流失/砂砾石/本构模型Key words
suffusion/fine grains lose/sand and gravel/constitutive model分类
建筑与水利引用本文复制引用
吴梦喜,叶发明,张琦..细颗粒流失对砂砾石土本构关系的影响研究[J].岩土力学,2017,38(6):1550-1556,7.基金项目
国家重点基础研究发展计划课题(No.2013CB035903) （No.2013CB035903）
国家科技支撑计划课题(No.2014BAB03B04).This work was supported by National Basic Research Development Program of China (2013CB035903) and National Key Technology Research and Development Program of the Ministry of Science and Technology of China (2014BAB03B04). （No.2014BAB03B04）
