粗粒土的破碎耗能计算及影响因素  

Measurement of breakage energy of coarse granular aggregates

作　　者：贾宇峰[1] 迟世春[1] 杨峻[2] 林皋[1] 

机构地区：[1]大连理工大学海岸与近海工程国家重点实验室,大连116024 [2]香港大学土木工程系

出　　处：《岩土力学》2009年第7期1960-1966,共7页Rock and Soil Mechanics

基　　金：国家自然科学基金项目(No50479057)资助

摘　　要：粗粒土的颗粒破碎直接改变了土体本身结构,对粗粒土的剪胀和内摩擦角都会产生影响。在土体剪切过程中,体积应力和剪切应力在体积应变和剪切应变上做功,这部分能量在剪切过程中转化为颗粒的弹性储能、颗粒间的摩擦耗能、颗粒剪胀时对外做功和颗粒破碎耗能4部分。准确计算剪切过程中粗粒土破碎耗能的目的是:从能量角度分析颗粒破碎对土体本构关系的影响,为建立考虑颗粒破碎的粗粒土本构关系创造条件。通过分析粗粒土的常规三轴试验数据,计算得到了剪切过程中的粗粒土破碎耗能。计算结果表明,常规三轴试验条件下粗粒土破碎耗能主要受固结应力、土体摩擦系数M等因素的影响。Particle breakage of coarse granular aggregates changes its structure directly, influencing its dilatancy and friction angle. In the course of shearing, normal stress and shear stress do work on volume strain and shear strain. This energy is transformed into particle elastic energy storage, particle friction energy consumption, work done by particle dilatancy and particle breakage energy. The accurate measurement on breakage energy of coarse granular aggregates in the course of shearing aims that it provides a method to analyze the particle breakage influence on constitutive relation in the perspective of energy, creating conditions for development of coarse granular aggregates constitutive relations considering particle breakage. The breakage energy of coarse granular aggregates in the course of sheafing is calculated by analyzing the results of the coarse granular aggregates in triaxial compression test. The results indicate that the breakage energy during triaxial tests is mainly influenced by confining stress and friction coefficient.

关 键 词：颗粒破碎 破碎耗能 摩擦系数 临界状态 临界状态线斜率 剪胀 

分 类 号：TU411[建筑科学—岩土工程]