基于互层岩体的非定常黏弹塑性蠕变模型及有限元分析  

Non-constant viscoelastic-plastic creep model and finite element analysis based on interbedded rock mass

作　　者：胡涛涛 康志斌 陈建勋[1] 胡雄 王栋 HU Taotao;KANG Zhibin;CHEN Jianxun;HU Xiong;WANG Dong(School of Highway,Chang’an University,Xi’an 710064,P.R.China;CCCC First Highway Consultants Co.,Ltd.,Xi’an 710065,P.R.China)

机构地区：[1]长安大学公路学院,西安710064 [2]中交第一公路勘察设计研究院有限公司,西安710065

出　　处：《重庆大学学报》2023年第10期118-126,共9页Journal of Chongqing University

基　　金：国家自然科学基金资助项目(51908052,4183286);中国博士后基金资助项目(2019M653518);陕西省自然科学基础研究计划资助项目(2022JM-203);长安大学中央高校基本科研业务费专项资金资助(300102213211)。

摘　　要：为研究互层岩体在考虑时效变形作用时的蠕变特性,提出了一种考虑应力、应变阈值的非定常黏弹塑性五元件模型。该模型能够同时描述岩体的瞬时弹性应变、黏弹性蠕变、线性黏塑性蠕变和非线性黏塑性蠕变(加速蠕变),推导得出了其在三维应力状态下的蠕变方程;基于ABAQUS有限元软件完成了UMAT子程序的研发,并通过对比岩体的室内蠕变试验与该模型数值模拟结果来验证模型的适用性。结果表明:蠕变试验结果与数值计算结果相吻合,非定常黏弹塑性模型不仅可以精确描述减速蠕变和稳态蠕变过程,还可以较好地描述岩体的加速蠕变过程,从而验证了该模型的适用性与有效性。To study the creep characteristics of interbedded rock mass when considering the effect of time-dependent deformation.This paper proposes a non-constant viscoelastic plastic five-element model considering stress and strain thresholds.The model can simultaneously describe the instantaneous elastic strain,viscoelastic creep,linear viscoplastic creep and nonlinear viscoplastic creep(accelerated creep)of the rock,and derives its creep equation under the three-dimensional stress state.Based on the ABAQUS finite element software,the development of the UMAT subroutine was completed,and the applicability of the model was verified by comparing the indoor creep test of the rock with the numerical simulation results of the model.The results show that the results of the creep test are consistent with the results of the numerical calculations.The non-constant viscoelastic-plastic novelty model can not only accurately describe the decelerated creep and steady-state creep processes,but also can better describe the accelerated creep process of rocks.This verifies the applicability and effectiveness of the model.

关 键 词：互层岩体 非线性蠕变 损伤 黏弹塑性模型 UMAT子程序 

分 类 号：TU458.4[建筑科学—岩土工程]