岩土力学2017，Vol.38Issue(5)：1267-1272,6.DOI:10.16285/j.rsm.2017.05.005
黏土黏附力试验研究
Experimental study of adhesion of clay
摘要
Abstract
Foundation will be subjected to resistance during the process of uplift or pullout.Adhesion is a contributing component of the resistance and a key factor in determining the pullout capacity of soils.In order to study the laws and factors of adhesion,the compound adhesion-measuring disc is modified to eliminate the effect of the pore water pressure of soils on adhesion during its pullout by venting the bottom of the inner disc.Adhesions of soil are measured with different water contents and pullout velocities.Test results show that the drawing stress of soil on structure increases linearly with the increase of the displacement of pullout until it reaches adhesion limit.The adhesion of soil is zero when the water content is low and increases when the water content exceeds plastic limit.It decreases to a constant value after it reaches its maximum.The maximal cohesion under constant pullout velocity increases and the corresponding water content decreases as the pullout velocity increases.When the water content of soil is the same,the relationship between adhesion and the logarithm of pullout velocity is in an S shape.The ratio of adhesion to undrained shear strength increases with the increase of water content.The test results provide a sound basis for understanding the laws of adhesion and can be used in practical engineering.关键词
黏土/组合吸盘/黏附力/拉拔速率/含水率Key words
clay/compound adhesion measuring disc/adhesion/pullout velocity/water content分类
建筑与水利引用本文复制引用
邱长林,张庆建,闫澍旺,纪玉诚..黏土黏附力试验研究[J].岩土力学,2017,38(5):1267-1272,6.基金项目
国家自然科学基金项目(No.41272323) （No.41272323）
国家优秀青年科学基金项目(No.51322904).This work was supported by the Natural Science Foundation of China (41272323) and the National Outstanding Youth Science Foundation Project (51322904). （No.51322904）
