结构性软土的扰动附加变形分析  

Analysis on Additional Settlement of Structured Soft Clay due to Disturbance

作　　者：刘海涛[1,2] 郭院成[1] 

机构地区：[1]郑州大学土木工程学院,郑州450002 [2]华北水利水电学院土木工程系,郑州450045

出　　处：《地下空间与工程学报》2015年第1期17-22,共6页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金项目(50978235)

摘　　要：通过分析软土结构性成因及压缩特点,采用五段折线模拟结构性原状软土压缩曲线,体现了欠压密片架结构软土的力学特点,且基本符合结构性土体的变形发展趋势。针对扰动软土提出虚拟前期固结压力的概念,指出变形初期扰动土体的受力变形可由结构性部分受力变形和损伤部分受力变形的线性组合表示。算例分析显示相同扰动度情况下,高堆载所引起的扰动附加变形比低堆载所引起的扰动附加变形大得多。本文所建议的扰动附加沉降计算模型对工程实践有一定的参考价值。Five-broken Line was used to simulate the compression curve of structural soft soil,which not only reflected the mechanical characteristics of soft soil but also basically conformed to the deformation trend of structural soil,after a comprehensive analysis of structural formation and compression characteristics of soft soil. The concept of Virtual Pre-consolidation Pressure was proposed for the disturbed soil,and at the beginning the deformation of disturbed soil was a linear combination of deformation composed of structural part and damaged part. Example showed that additional settlement caused by high load was much larger than that caused by low load at the same disturbed degree of structural soil. The additional settlement model suggested in this paper can serve as reference to engineering practice.

关 键 词：结构性软土 附加沉降 五段折线 扰动 虚拟前期固结压力 

分 类 号：TU43[建筑科学—岩土工程]