复杂应力条件下粗粒料的剪胀性研究进展  

Research Progresses in Dilatancy of Coarse Granular Materials under Complex Stress Conditions

作　　者：周跃峰[1] 左永振[1] 万航 ZHOU Yue-feng;ZUO Yong-zhen;WAN Hang(Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources,Changjiang River Scientific Research Institute,Wuhan 430010,China;School of Civil Engineering and Architecture,China Three Gorges University,Yichang 443002,China)

机构地区：[1]长江科学院水利部岩土力学与工程重点实验室,武汉430010 [2]三峡大学土木与建筑学院,湖北宜昌443002

出　　处：《长江科学院院报》2024年第8期104-112,共9页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金项目(51979010,U21A20158);中央公益性科研院所基本科研业务费项目(CKSF2023318/YT)。

摘　　要：粗粒料的剪胀性是其强度和变形研究的重要问题之一,它取决于颗粒排列、粒间压力等细微观作用;在宏观层面,受相对密度与应力状态的影响。围绕复杂应力条件下粗粒料的剪胀问题,从粗粒料力学特性的试验研究、粗粒料的剪胀性强度准则以及临界状态与剪胀性方面,对国内外的研究进展进行了系统论述。在此基础上,提出该领域呈现如下发展态势:①通过大型真三轴试验开展粗粒料剪胀率的试验研究与理论分析,能够促进粗粒料本构理论的发展进步;②结合应力路径试验中的应力变形规律研究,可实现从常规三轴条件下向复杂应力条件下的剪胀方程的进一步发展,从而体现强度与变形问题的统一;③采用状态参量去评价土体的松密状态与剪胀性,能够耦合应力状态与孔隙比,尽量避免“一种材料,多组参数”。研究结果表明状态参量和应力路径相结合的方法,使得粗粒料的力学特性研究更加具有科学性和系统性。Dilatancy is an important mechanical issue in the study on strength and deformation of coarse granular materials.It is governed by microscopic factors such as particle arrangement and inter-particle pressure,and hence is affected by macroscopic variables including relative density and stress state.In this article,research progresses in the dilatancy of coarse granular materials under complex stress conditions are reviewed from the aspects of mechanical properties,strength criteria,critical state,and dilatancy behavior.Future trends in research are outlined as follows:1)Laboratory investigation via large-scale true triaxial tests and theoretical analysis on the dilatancy of coarse granular material would drive advancements in constitutive modeling.2)Study on the stress-deformation facilitates the dilatancy equations under conventional triaxial condition developing into that under complex stress condition,thereby unifying strength and deformation issues.3)Coupling stress state and void ratio with state parameters offers a systematic approach to assessing the compactness state of soils and their dilatancy behavior,potentially reducing the reliance on multiple material parameters.The integration of state parameters and stress paths indicates a more scientific and systematic approach in the research on the mechanical properties of coarse granular materials.

关 键 词：粗粒料 剪胀性 真三轴试验 强度准则 状态参量 

分 类 号：TU454[建筑科学—岩土工程]