冻融作用对饱和粉质黏土抗剪性能的影响  

Influnce of freeze-thaw on shear strength properties of saturated silty clay

作　　者：于琳琳[1] 徐学燕[1] 邱明国[1] 闫自利 李鹏飞 

机构地区：[1]哈尔滨工业大学土木工程学院,哈尔滨150090 [2]中交隧道局(西安)第二工程有限公司,西安710075

出　　处：《岩土力学》2010年第8期2448-2452,共5页Rock and Soil Mechanics

基　　金：铁道部科技开发计划项目(No.2006G001-B-3);国家自然科学基金资助项目(No.40571032)

摘　　要：为研究季节冻土地区冻融作用对道路边坡土体抗剪性能的影响规律,在不同冻结和融化温度、不同冻融循环次数、开放和封闭体系条件下对冻融饱和原状粉黏土试样进行了不固结、不排水剪切试验。试验结果表明:饱和原状粉质黏土冻融后,黏聚力降低,内摩擦角增大,冻结温度越低,冻融作用对黏聚力和内摩擦角的影响越小,随着冻融循环次数的增加,5～7次冻结循环后二者的变化逐渐趋于稳定。水分补给会强化冻融作用对试验土抗剪性能的影响;融化温度对试验土的抗剪性能影响很小。In order to reveal the regular influence of freezing-thawing cycle on shearing strength properties of road slope soil in seasonally frozen area,unconsolidated-undrained test was carried out on saturated undisturbed silty clay under different experimental conditions such as freezing and thawing temperature,freezing-thawing cycle index and open or closed system.The test results indicate that after freezing-thawing,cohesion decreases,but internal frictional angle increases;the lower freezing temperature is,the less influence of freezing-thawing cycle on cohesion and internal frictional angle is.As freezing-thawing cycle number increases,after 5-7times,the changes of shearing strength properties gradually become stable.Water supply can reinforce the influence of freezing-thawing on C andφ;thawing temperature has a slight effect on the shearing strength properties of saturated undisturbed silty clay.

关 键 词：冻融循环 饱和原状粉质黏土 抗剪性能 冻结和融化温度 

分 类 号：TU411.7[建筑科学—岩土工程]