花岗岩残积土的崩解性及软化损伤参数研究

针对花岗岩残积土的崩解与软化特性,从结构性与损伤角度研究,为今后的定量分析研究奠定基础。首先进行一系列定性崩解试验并利用已有的定量试验结果,引入崩解速率指标,结合花岗岩残积土的微结构特征,对崩解的结构性机制进行全面分析,提出将崩解过程分为扰动性、结构性及溶解性三个阶段,揭示花岗岩残积土崩解的根本致因是软化;然后基于复合体损伤模型,提出将损伤分为应变损伤和非应变损伤,将花岗岩残积土的浸水软化看成一种非应变损伤,利用花岗岩残积土粘聚力与结构强度的相关性,提出浸水软化损伤参数的确定方法。

A study on calving property and softening damage parameter of GRS

Aim at the calving and softening properties of granite residual soils (GRS),studies were carried out from points of view with structure and damage to lay a foundation for the quantitative analysis in future.On the one hand,after a series of qualitative calving tests were conducted and a quantitative test result was utilized,and the calving rate index was recommended,the calving mechanism was studied comprehensively with the microstructure characteristics of GRS,main results as follow: the calving process can be divided into three stages of disturbance,structure and dissolution;the essential reason for calving is softening.On the other hand,based on the elastoplastic damage model,in which non-strain damage was developed,or damage includes strain and non-strain damage;then,regarding softening in water as a kind of non-strain damage and making full use of the interrelationship of cohesive force and structure strength of GRS,the determination method for softening damage parameter was put forward.