蠕变条件下吹填软土结构强度形成研究  

A study of the formation of structure yield stress subject to creep of the soft dredger fill

作　　者：杨爱武[1,2,3] 闫澍旺[1] 杜东菊[2,3] 

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

出　　处：《水文地质工程地质》2011年第6期62-67,83,共7页Hydrogeology & Engineering Geology

基　　金：天津市科技发展计划项目(04311381);天津市科技发展计划重点科技攻关项目(06YFSZSF 04000);天津市科技创新专项资金项目(07FDZ DSF02101)

摘　　要：土体的结构性对土的工程力学性质具有决定性的影响。本文以天津滨海吹填软土为土质材料,进行了蠕变作用下土体结构屈服应力形成试验及相应的微观结构分析。试验结果表明:蠕变对土体结构性的影响是一个综合作用的过程,其中排水条件最为关键,在此基础上,围压及偏压都对土体结构屈服应力的增长起作用,并随时间的增长而增长。反之,土体的结构屈服应力变化不大。微观结构分析表明,小偏应力蠕变作用下结构屈服应力的形成实质是其微观结构逐渐稳定的过程。Soil structure has a significant influence on its engineering mechanics behavior.To investigate the form of structure yield stress of the soils,the creep tests and micro-structure are conducted on the soft dredger fill in the Tianjin Binhai New Area.The results indicate that the influence of the creep on the soil structure is a comprehensive process,among them,drainage is the most critical condition.Base on this,the structure yield stress are effected by the cell pressure and deviator pressure,increasing with time.Conversely,no obvious variations occur in the structure yield stress of the soils.Through micro-structure analysis,it is known that the essence of the form of structure yield stress by creep of small deviation stress is the gradual stability procession of micro-structure.

关 键 词：吹填软土 蠕变 结构屈服应力 微观结构 

分 类 号：TU411.3[建筑科学—岩土工程]