长江科学院院报2017，Vol.34Issue(11)：89-95,7.DOI:10.11988/ckyyb.20170327
基于应变屈服临界的岩石黏弹塑性蠕变模型研究
Visco-elastic-plastic Creep Model of Rock Based on Strain Yield Critical Criteria
摘要
Abstract
According to rock mechanical characteristics of creep deformation at different stages,the visco-elasticplastic states from deformation to rupture are classified,and the corresponding creep mechanical properties at different states are given.Under the assumption that ductile shear failure occurs in triaxial compression test,the maximum principal strain discriminant for the critical state transformation is derived using Drucker-Prager strain criterion.Furthermore,a visco-elastic-plastic damage evolution model for describing the nonlinear acceleration creep behavior is constructed by introducing a statistical damage factor based on the theory of Perzyna in consideration of the hardening effect in subsequent yield.Moreover,triaxial creep test is Conducted with sandstone specimens from the Three Gorges Reservoir area,and the creep deformation curves under different pressures are acquired.Test results show that the creep characteristics of rock specimens are obvious,and non-linear accelerated creep happened under the final stress level.The proposed model is used for the fitting of test creep curves,and the fitting results suggest that the model could accurately describe different stages of sandstone' s creep deformation.关键词
岩石力学/黏弹塑性/蠕变力学试验/损伤/本构模型Key words
rock mechanics/visco-elastic-plasticity/creep mechanical tests/damage/constitutive model分类
建筑与水利引用本文复制引用
蒋昱州,王奔,王瑞红,卢波,李聪,朱杰兵..基于应变屈服临界的岩石黏弹塑性蠕变模型研究[J].长江科学院院报,2017,34(11):89-95,7.基金项目
国家自然科学基金项目(51579017,51479102,51109014,41672320) （51579017,51479102,51109014,41672320）
国家重点研发计划项目(2016YFC0401801) （2016YFC0401801）
长江科学院基本科研业务费项目(CKSF2016008/YT,CKSF2017066/YT) （CKSF2016008/YT,CKSF2017066/YT）
