Effect of volume changes on complete deformation behavior of rocks

来源期刊：中南大学学报(英文版)2010年第2期

论文作者：赵衡 曹文贵 李翔 张玲

文章页码：394 - 399

Key words：rock mechanics; constitutive model; statistical damage theory; volume change; void ratio

Abstract: For the purpose of describing the deformation characteristics of rocks, the effect of volume changes on mechanical properties of rocks should be taken into account with relation to the development of constitutive model. Firstly, rocks are divided into three parts, i.e., voids, a damaged part and an undamaged part in the course of loading. The void ratio was applied to describing the changes of voids or pores during the deformation process. Then, using statistical damage theory, a constitutive model was developed for rocks to describe their strain softening and hardening on the basis of investigating the relationship between the net stress and apparent stress, in which the influence of volume changes on rock behavior was correctly taken into account, such as the initial phase of compaction and the latter stage of dilation. Thirdly, a method of determining model parameters was also presented. Finally, this model was used to compare the theoretical results with those observed from experiments under conventional triaxial loading conditions.

基金信息：the National High-Tech Research and Development Program of China