天然沉积土压缩灵敏度评价方法研究进展与探讨  

Review and investigation on stress sensitivity of naturally sedimentary soils

作　　者：曾玲玲 ZENG Lingling(College of Civil Engineering,Zhejiang University of Technology,Hangzhou 310014,China)

机构地区：[1]浙江工业大学土木工程学院,浙江杭州310014

出　　处：《岩土工程学报》2025年第3期463-469,共7页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(52178361,42477164)。

摘　　要：天然沉积土在长期地质沉积过程中通常受到土结构性的影响,导致其力学性状有别于重塑土,土结构性损伤不时诱发天然沉积土体过大变形和滑坡的工程灾变。长期以来,不少研究者以天然沉积土重塑样的力学性状为基准,对比分析了天然沉积土原状样与重塑样的力学性状,提出了天然沉积土灵敏度评价体系。介绍压缩灵敏度概念,回顾国内外关于压缩灵敏度评价方法的研究进展,结合作者在土结构性对土体力学性状影响机理方面的理解与认识,分析了现有压缩灵敏度评价方法的优缺点,指出了不同压缩灵敏度评价基准的适用条件与局限。然后,采用作者等提出的统一压缩线描述了压缩过程天然沉积土压缩性状的变化规律,明确了土结构性损伤诱发工程灾变的风险所在,希望引起工程界重视。最后,探讨了压缩灵敏度评价方法的发展趋势,建议采用原状土结构性作用消失阶段为基准,发展与完善天然沉积土压缩灵敏度评价体系。The mechanical behaviour of the naturally sedimentary soils generally differs from that of the reconstituted ones,due to the soil structure developed during the depositional and post-depositional processes.It has been well reported that the engineering disasters associated with oversize deformation and slope instability often occur due to damage or loss of the resistance originated from the soil structure.For quite some time,the mechanical behaviour of the reconstituted soils has been used as a reference for assessing the role of the soil structure in the mechanical behaviour of the naturally sedimentary soils.This study focuses on the stress sensitivity defined as the ratio of the consolidation yield stress of the naturally sedimentary soils to the equivalent one on the uniquely normalized compression line.The start-of-the-art methods for assessing the stress sensitivity are introduced.Based on the author's best knowledge,their advantages and disadvantages are analyzed.The development of the intrinsic compression framework is summarized by examining the related limitations.The unified normalised compression line propsoed by the author and her research team is recomended to investigate the changing law of the soil structure resistance during compression.The risk of the engineering disasters associated with its damage or loss is understood to call for high concern in engineering practice.Finally,the development trend of the approaches for assessing stress sensitivity is discussed.The compression zone of the naturally sedimentary soils without the soil structure resistance is suggested to be used as a reference for the development and improvement of the stress sensitivity framework in the future.

关 键 词：土结构性 天然沉积土 压缩性状 压缩灵敏度 初始状态 

分 类 号：TU43[建筑科学—岩土工程]