水利水电科技进展2016，Vol.36Issue(4)：36-41,6.DOI:10.3880/j.issn.1006-7647.2016.04.007
砾石心墙土复杂应力耦合作用下的渗流特性
Permeability of gravel soil for core wall under complex stress coupling effect
摘要
Abstract
In order to study the permeability characteristics and permeability evolution model of gravel soil used in core wall of earth-rock dam, a self-made seepage-stress apparatus was used to conduct permeability test for gravel soil of the Changheba Hydropower Station in complex stress state. Test results show that complex stress has significant effect on permeability evolution of gravel soil, the relationship between seepage velocity and hydraulic gradient follows Darcy’ s law within the range of the design hydraulic gradient, and seepage failure of soil samples does not occur. The results also show that under the same confining pressure, permeability coefficient of gravel soil decreases gradually as the partial stress and axial stress increases. There is a stepwise relationship between the axial strain and the stress acting time in the test process. As the partial stress grows, the axial strain increases with the seepage gradient. An empirical formula for relationship between the permeability coefficient and the stress function is established, which further reveals the permeability evolution mechanism of gravel soil under complex stress theoretically.关键词
砾石心墙土/复杂应力/渗透系数/轴向应变/渗透性演变Key words
gravel soil for core wall/complex stress/permeability coefficient/axial strain/permeability evolution分类
建筑与水利引用本文复制引用
詹美礼,辛圆心,唐健,黄青富,盛金昌,罗玉龙..砾石心墙土复杂应力耦合作用下的渗流特性[J].水利水电科技进展,2016,36(4):36-41,6.基金项目
国家自然科学基金(51474204,51579078) （51474204,51579078）
