非饱和结构性黄土吸附强度的试验研究  

RESEARCH ON SUCTION STRENGTH OF UNSATURATED STRUCTURAL LOESS

作　　者：胡再强[1] 张豫川[1,2] 张千一[1] 员康锋[1] 赵凯[1] 

机构地区：[1]西安理工大学水利水电学院,陕西西安710048 [2]兰州大学土木工程与力学学院,甘肃兰州730000

出　　处：《岩石力学与工程学报》2011年第10期2137-2142,共6页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(50778152);陕西省黄土力学与工程重点实验室项目(09JS104)

摘　　要：以甘肃永登非饱和结构性黄土为研究对象,通过等吸力三轴试验,研究非饱和黄土在控制吸力条件下的剪切性状,得到基质吸力随含水率及围压的变化规律和基质吸力与吸附强度之间的相互关系,并推导新的吸附强度公式,该公式可预测不同吸力对非饱和黄土抗剪强度的贡献。试验结果表明:非饱和黄土的基质吸力随含水率和围压的增大分别减小,但含水率的变化对基质吸力的改变起着主导作用,在低含水率情况下,基质吸力灵敏度较高,吸附强度随基质吸力的增大而增大,围压对吸附强度的影响较小。本研究为非饱和黄土抗剪强度应用于西部地区黄土工程实践提供了一种新的方法。Triaxial tests under constant suction are performed to study the shear characteristics under the control of matrix suction by using the unsaturated Yongdeng loess in Gansu province.Variation of matrix suction with water content and confining pressure and the relationship between matrix suction and suction strength are obtained.Besides a formula which can predict the contribution of different suctions to the shear strength of unsaturated loess is derived.The test results show：the matrix suction decreases with the increases of water content and confining pressure;while water content dominates the change of matrix suction.The suction strength is increasing with the increment of matrix suction and it is of high sensibility in the situation of low water content.This research provides a new method for the practical use of unsaturated loess shear strength in the western region loess engineering.

关 键 词：土力学 非饱和黄土 基质吸力 吸附强度 

分 类 号：TU43[建筑科学—岩土工程]