工程地质学报2017，Vol.25Issue(2)：284-291,8.DOI:10.13544/j.cnki.jeg.2017.02.003
考虑前期固结影响的吹填软土安全运营阶段微结构演化特征
MICROSCOPIC STRUCTURE EVOLUTION PARAMETERS OF SOFT DREDGER FILL IN STAGE OF SAFE OPERATION HYPERPLASIA WITH PRECONSOLIDATION EFFECT
摘要
Abstract
The soft dredger fill has the characteristic of large void ratio,strong compressibility and low strength.It is fine grain soil of high clay content.Although the short soil formation time,it has certain structure strength.Mechanical property of soil depends on soil's microstructure.In engineering practice,the structural strength of soil increases in the stage of safe operation because of the sustained pressure on the soft dredger fill that has ground treatment.To study the microscopic parameter evolution of soft dredger fill in the process of hyperplasia,the remoulded soil from Binhai New Area of Tianjin is used to be the test material of complete structural deterioration.The variation of grain and pore count,equivalent diameter and aspect ratio is analyzed quantitatively in the process of hyperplasia of structure strength with Scanning Electron Microscope.The result of tests shows that:in the process of hyperplasia of structure strength,the count of grain and pore and equivalent diameter decline,while aspect ratio of grain and pore,and equivalent diameter increase.The change is obvious at the beginning of the generation of structure strength.The longer consolidation time,the stronger constitutive property is.Deviator pressure and consolidation time have the same effect on the constitutive property of soil.关键词
吹填软土/前期固结/微观参数/演化/结构性Key words
Soft dredger fill/Pre-consolidation/Microscopic parameters/Evolution/Structure characteristics分类
天文与地球科学引用本文复制引用
杨爱武,张振东,李潇雯,郭林坪..考虑前期固结影响的吹填软土安全运营阶段微结构演化特征[J].工程地质学报,2017,25(2):284-291,8.基金项目
国家自然科学基金项目(41372291),天津市自然科学基金重点项目(15JCZDJC40600,15ZCZDSF00220)资助. （41372291）
