水利水电科技进展2017，Vol.37Issue(3)：55-60,6.DOI:10.3880/j.issn.10067647.2017.03.009
黏土渗透性温度效应试验
Experiments on temperature effect of hydraulic conductivity of compacted clay
摘要
Abstract
The hydraulic conductivities of compacted clay at various temperatures were tested with different methods, the improved GDS full-automatic geoenvironmental permeameter ( with a flexible wall) and Nan-55 permeameter ( with a rigid wall) . Results show that the hydraulic conductivity increased with temperature, and they were positively linearly related in a semi-logarithmic plane;the rates of increase of hydraulic conductivity from tests with a flexible wall and rigid wall were, respectively, up to 5. 5 and 2. 7 times higher at 70℃ than at 20℃. The hydraulic conductivity obtained from the GDS permeameter was larger than that obtained from the Nan-55 permeameter under the same dry density, due to different sample sizes and preparation methods in the two hydraulic tests. Assuming that the viscosity and density changed with temperature, while, the intrinsic permeability of compacted clay was invariable, the estimated hydraulic conductivity varying with temperature agreed with measured results, implying that the change in fluid properties contributed greatly to the increase of the hydraulic conductivity. However, there were certain differences between estimated and measured results of hydraulic conductivity, because the intrinsic permeability changed with temperature in real conditions. For the sample at a confining pressure of 55 kPa, the intrinsic permeability obtained from the GDS permeameter increased significantly with temperature, and the estimated hydraulic conductivity was larger than measured results; while, the intrinsic permeability obtained from the Nan-55 permeameter decreased slightly with the increase of temperature, and there was little difference between the estimated and measured results of hydraulic conductivity.关键词
温度效应/渗透系数/固有渗透率/柔性壁渗透试验/硬性壁渗透试验Key words
temperature effect/hydraulic conductivity/intrinsic permeability/flexible-wall hydraulic test/rigid-wall hydraulic test分类
建筑与水利引用本文复制引用
何俊,胡晓瑾,颜兴,万娟..黏土渗透性温度效应试验[J].水利水电科技进展,2017,37(3):55-60,6.基金项目
湖北省自然科学基金(2014CFB606) （2014CFB606）
湖北省高等学校优秀中青年科技创新团队计划(T201605) （T201605）
国家自然科学基金(51608182) （51608182）
