参数非定常的软岩非线性黏弹塑性蠕变模型  

A nonlinear viscoelastic-plastic creep model of soft rock with unsteady parameters

作　　者：刘开云[1] 薛永涛 周辉[3] LIU Kaiyun;XUE Yongtao;ZHOU Hui(School of Civil Engineering,Beingjing Jiaotong University,Beijing 100044,China;Henan Provincial Communications Planning ＆ Design Institute Co,Ltd,Zhengzhou,Henan 450000,China;Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071,China)

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]河南省交通规划设计研究院股份有限公司,河南郑州450000 [3]中国科学院武汉岩土力学研究所,湖北武汉430071

出　　处：《中国矿业大学学报》2018年第4期921-928,共8页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(51378052)

摘　　要：经典线性组合元件模型难以描述岩石三阶段不稳定蠕变,至今已经出现很多非线性组合元件模型来表述完整的岩石三阶段蠕变,但仍然存在不足.基于Maxwell蠕变模型,引入非线性黏塑性体(NVPB模型)和其串联,并根据蠕变过程中岩石弹性模量随时间的弱化规律,提出了一种新的参数非定常非线性黏弹塑性蠕变本构模型,可以完整地描述泥岩三阶段不稳定蠕变.通过泥岩蠕变试验数据对该非定常非线性蠕变模型参数进行了辨识,并将该蠕变模型的计算结果和试验数据进行了对比,证明了本文所建立的非定常非线性黏弹塑性蠕变模型的正确性与合理性.The classical linear combination element model can not describe the three stage unstable creep of rock.Many nonlinear composite element models have been developed,however,there are still deficiencies in these models.By connecting the nonlinear visco-plastic block（NVPB）in series with the Maxwell creep model,and considering the weakening of elastic modulus in the creep process of rock with time,a new nonlinear viscoelastic plastic creep constitutive model with unsteady parameters was proposed in this paper.This model can fully describe the three stages of unstable creep of mudstone.The parameters of the unsteady nonlinear creep model were identified by the mudstone rheological experimental data.By comparing the computation results from this obtained model with the experimental data,this new unsteady nonlinear rheological constitutive model is proved to be correct and reasonable.

关 键 词：软岩 蠕变 非定常 非线性 黏弹塑本构 

分 类 号：TU443[建筑科学—岩土工程]