考虑中主应力影响的吹填土结构强度研究  

A study of the structure strength of dredger fill considering the effect of intermediate principal stress

作　　者：杨爱武[1,2] 杜东菊[1,2] 李佐良[1,2] 闫澍旺[3] 

机构地区：[1]天津城市建设学院土木工程系,天津300381 [2]天津市软土特性与工程环境重点实验室,天津300384 [3]天津大学建筑工程学院,天津300381

出　　处：《水文地质工程地质》2013年第2期70-73,78,共5页Hydrogeology & Engineering Geology

基　　金：天津市科技发展计划项目(06YFSZSF04000,11JCZDJC23900)

摘　　要：通过真三轴试验,以天津吹填软土为试验材料,研究了三向受力条件下土体结构强度变化特点。试验结果表明,结构屈服应力与结构强度随中主应力增大呈非线性变化,在b=0.5～0.75之间会出现峰值,随着中主应力的增大结构屈服应力点对应的应变量逐渐减小。在三向应力作用下,膨胀变形不利于结构性的保持,压缩变形对结构性保持有利。Based on the true triaxial test on soft dredger fill in Tianjin,this paper examines the change in soil structural strength under three-dimension compression.The results indicate that the structure yield stress and the structure strength have nonlinear changes with the increase of the intermediate principal stress.The peak value appears when the value b is in the range of 0.50 to 0.75,the strain corresponding with the structure yield stress decreases with the growth of the intermediate principal stress.Under the condition of threedimension compression,swelling deformation goes against the maintenance of the structure while the compression deformation is on the contrary.

关 键 词：真三轴 结构屈服应力 结构强度 吹填软土 

分 类 号：TU432[建筑科学—岩土工程]