A NEW CONSTITUTIVE MODEL FOR THE TIME-DEPENDENT BEHAVIOR OF ROCKS WITH CONSIDERATION OF DAMAGE PARAMETER

IF 4.3 3区工程技术 Q1 ENGINEERING, CIVIL

Journal of Civil Engineering and Management Pub Date : 2022-03-02 DOI:10.3846/jcem.2022.16609

Sara Ebrahimi Zohravi, A. Lakirouhani, H. Molladavoodi, Jurgis Medzvieckas, R. Kliukas

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引用次数: 1

Abstract

Deformation and time-dependent behavior of rocks are closely related to the stability and safety of underground structures and mines. In this paper, a numerical-analytical model is presented to investigate time-dependent damage and deformation of rocks under creep. The proposed model is obtained by combining the elastic-visco-plastic model based on the theory of over-stress and stress hardening law with the sub-critical crack growth model. The advantage of this model is that it is in incremental form and therefore can be implemented numerically. First, the governing equations of the model and its numerical computational algorithm are described. The proposed constitutive model is then implemented in the FLAC code using the FISH function. Determination of model parameters and calibration is done by various laboratory tests performed on a type of gypsum. The creep test was performed on gypsum under a stress of 13 MPa, which is equal to 70% of its compressive strength. After determining the parameters, by fitting the creep curve of the presented analyticalnumerical model, a good agreement is observed with the creep curve obtained from the laboratory data. It is also observed that during creep, the damage parameter and wing crack length increase.

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考虑损伤参数的岩石时效本构模型

岩石的变形和随时间变化的特性与地下结构和矿山的稳定和安全密切相关。本文建立了蠕变作用下岩石损伤与变形随时间变化的数值分析模型。该模型是将基于超应力理论和应力硬化规律的弹粘塑性模型与亚临界裂纹扩展模型相结合而得到的。该模型的优点是它是增量形式，因此可以在数值上实现。首先，描述了模型的控制方程及其数值计算算法。然后在FLAC代码中使用FISH函数实现所提出的本构模型。模型参数的确定和校准是通过对一种石膏进行的各种实验室测试来完成的。对石膏进行蠕变试验，应力为13 MPa，等于石膏抗压强度的70%。在确定参数后，通过拟合所提出的解析数值模型的蠕变曲线，与实验室数据得到的蠕变曲线吻合较好。在蠕变过程中，损伤参数和机翼裂纹长度均呈增加趋势。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Civil Engineering and Management ENGINEERING, CIVIL-

CiteScore

6.70

自引率

4.70%

发文量

审稿时长

1.7 months

期刊介绍： The Journal of Civil Engineering and Management is a peer-reviewed journal that provides an international forum for the dissemination of the latest original research, achievements and developments. We publish for researchers, designers, users and manufacturers in the different fields of civil engineering and management. The journal publishes original articles that present new information and reviews. Our objective is to provide essential information and new ideas to help improve civil engineering competency, efficiency and productivity in world markets. The Journal of Civil Engineering and Management publishes articles in the following fields: building materials and structures, structural mechanics and physics, geotechnical engineering, road and bridge engineering, urban engineering and economy, constructions technology, economy and management, information technologies in construction, fire protection, thermoinsulation and renovation of buildings, labour safety in construction.