期刊论文

Computing Research on Rock Loading and Unloading Based on Coupled Elastoplasticity Damage Model

中文

地下空间与工程学报

1673-0836

2018

14

1

12-18

51508040:国家自然科学基金 51678074:国家自然科学基金 51578079:国家自然科学基金 51378082:国家自然科学基金 2016SK2023:湖南省重点研发计划项目 kfj150305:长沙理工大学道路结构与材料交通行业重点实验室开放基金 CX2016B383:湖南省研究生科研创新项目

本校为第一机构

基于经典弹塑性理论,引入损伤因子,综合考虑岩石在外力作用下的塑性变形与损伤演化,提出一种各向同性弹塑性损伤耦合模型。根据以上理论编制有限元计算程序,较好地描述了岩石在不同加卸载路径中的应力-应变特性。通过程序模拟计算,具体结论如下:在常规路径加载中,岩石的峰值强度与残余强度均随围压的增加而增加。在卸围压路径下,残余应力受初始围压影响较小,但侧向应变与体应变有着明显的增加。轴向荷载的提高使岩石损伤值增加,卸围压过程中最大损伤因子均大于同等初始围压下的常规路径试验。

Based on classical elastoplasticity theory and by introducing the scalar damage factor,a coupled isotropic elastoplasticity damage model is proposed for the rock in different loading and unloading condition. In the proposed model,the damage evolution and plastic strain are synthetically considered. Then,the proposed model has been programmed and certain numerical simulations have been done. The numerical simulations show that the proposed model can better describes the stress - strain characteristics of rock under different stress path. Some conclusions are as follows: in conventional triaxial...