长江科学院院报2016，Vol.33Issue(9)：72-77,82,7.DOI:10.11988/ckyyb.20150992
蒙脱土失水缩裂过程的边界摩擦与温度效应
Effects of Boundary Friction and Temperature on the Process of Shrinking and Cracking of Pure Montmorillonite During Pore Water Evaporation
摘要
Abstract
The shrinking and cracking of expansive soil during pore water evaporation is one of the main causes which greatly deteriorate its engineering properties.Latest research indicates that the increase of suction and inho-mogeneous distribution mainly lead to the shrinking and cracking of expansive soil.However,few experiments about the expansive soil shrinking consider the effect of boundary condition on the shrinking process.In this re-search,pure montmorillonite is taken as test material,and its shrinking process in the presence of glass and vaseline friction boundaries are tested at different temperatures.The computer image processing technique is employed to quantify the geometric structure and morphologic characteristics of cracks.A conceptual model of shrinking and cracking of clay is established.Test results indicate that during the process of saturation-dehydration,cracks of specimens with vaseline-surface occur late and the critical water content of cracking is obviously lower than that of glass-surface specimens.At temperatures of 20℃,30℃ and 40℃,the final amount of cracks of vaseline-surface specimen is smaller than that of glass-surface specimen by 70.3%,79.6%and 77.6%,respectively.Additional-ly,in the presence of the same boundary friction,the pore water evaporation accelerates and the final amount of cracks increases with the increasing of temperature.关键词
蒙脱土/收缩/裂隙/边界摩擦效应/温度效应Key words
montmorillonite/shrinkage/crack/boundary friction effect/temperature effeect分类
建筑与水利引用本文复制引用
杜文凤,王菁莪,刘清秉,项伟,黄伟..蒙脱土失水缩裂过程的边界摩擦与温度效应[J].长江科学院院报,2016,33(9):72-77,82,7.基金项目
国家自然科学基金项目（41572286）；中国博士后科学基金项目 （）
