基于Burgers模型考虑损伤的岩石蠕变全过程研究

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英文篇名：Study on the Whole Process of Rock Creep Considering Damage Based on Burgers Model 作者：汪妍妍 ; 盛冬发 英文作者：WANG Yanyan;SHENG Dongfa;Civil Engineering Institute, Southwest Forestry University; 关键词：Burgers模型 ; 非线性 ; 损伤 ; 蠕变全过程 英文关键词：burgers model;;nonlinear;;damage;;whole process of creep 中文刊名：SHLX 英文刊名：Chinese Quarterly of Mechanics 机构：西南林业大学土木工程学院; 出版日期：2019-03-20 08:59 出版单位：力学季刊 年：2019 期：v.40 基金：国家自然科学基金(11862023);; 云南省教育厅科学研究基金项目(2018Y124) 语种：中文; 页：SHLX201901016 页数：6 CN：01 ISSN：31-1829/O3 分类号：147-152

摘要

岩石蠕变是一个显著的非线性问题,而经典的Burgers模型是一种线性蠕变模型,必然不能全面地描述岩石蠕变的全过程.当岩石处于高应力水平下的加速蠕变阶段,岩石内部损伤会不断产生和累积,蠕变呈现出明显的非线性特征.为了更好地描述考虑损伤的岩石蠕变全过程,本文假定加速蠕变阶段的损伤演化方程,将损伤引入到Burgers模型中,提出了一种非线性蠕变损伤模型.然后以乔后盐矿试件蠕变实测数据为分析案例,验证模型在应用于实际工程时的准确性和适用性.最后根据Origin软件数值拟合的结果,表明本文所提出的非线性蠕变损伤模型能很好地描述岩石蠕变全过程,模型参数取值也在合理范围之内,模型拟合曲线与实验所得数据具有较好的一致性.
        The problem of rock creep has significant nonlinearity, but the classical Burgers model is linear, which can not comprehensively describe the whole process of rock creep. When the rock is in the accelerated creep stage at high stress level, the creep behavior shows obvious nonlinear characteristics as the internal damage of rock is generated and accumulated. Firstly, in order to describe the whole creep process of rock precisely, this paper proposes a nonlinear creep damage model by assuming the damage evolution equation and introducing the damage into the Burgers model at the accelerated creep stage. Secondly, the creep test data of Chaohou Salt Mine specimen is used to verify the accuracy and applicability of the model. Finally, according to the results of numerical fitting by Origin software, it is shown that the nonlinear creep damage model proposed in this paper can well describe the whole process of rock creep, the magnitudes of model parameters are within reasonable ranges, and the model fitting curve is in good agreement with the data obtained from the experiment.

引文

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