结构性吹填软土流变等时曲线研究  

Rheological isochronous curve of the structural soft dredger fill

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

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

出　　处：《煤田地质与勘探》2012年第6期58-62,共5页Coal Geology & Exploration

基　　金：天津市科技发展计划项目(06YFSZSF04000;11JCZDJC23900);国家自然科学基金项目(51179186)

摘　　要：软土普遍存在结构性,结构性影响土体各种力学行为。对天津滨海新区结构性吹填软土进行三轴流变试验,通过对比分析原状土与重塑土流变等时曲线发现,结构性吹填软土流变等时曲线可分离为线性粘弹性变形、线性粘塑性变形与非线性粘塑性变形。在应力小于结构屈服应力时,流变等时曲线线刚度大;超过结构屈服应力时,伴随着土结构的破损,流变等时曲线线刚度逐渐减小,最终趋于一定值,与重塑土接近。结构性对流变等时曲线的影响主要集中在线弹性阶段,进入塑性阶段后影响较小。Soft soil has structural characteristics rheological test was conducted for structural soft which affect its mechanical behavior. In this paper, triaxial dredger fill in Tianjin Binhai new area. Through comparative analysis of undisturbed and remolded soil rheological isochronous curve we knew that the rheological isochronous curve of the structural soft dredger fill can be divided into linear visco-elastic behavior, linear visco-plastic defor- mation and nonlinear visco-plastic deformation. When stress is less than structure yielding stress, rheological isochronous curve linear rigidity is larger; conversely, with the soil structure damaged, it turned to smaller, finally tended to be a certain value approaching to remolded soils. The structure affects rheological isochronous curve is mainly in linear elastic stage and smaller in plastic stage.

关 键 词：吹填软土 结构性 流变 等时曲线 

分 类 号：TU4[建筑科学—土工工程] P642[天文地球—工程地质学]