本构方程
材料科学
威布尔分布
残余应力
硬化(计算)
非线性系统
残余物
压实
结构工程
固体力学
弹性模量
压力(语言学)
岩土工程
机械
复合材料
地质学
有限元法
数学
工程类
算法
哲学
物理
统计
量子力学
语言学
图层(电子)
作者
Xunjian Hu,Dongdong Ma,Ni Xie,Qizhi Zhu,Haibo Hu,Xiaonan Gong
标识
DOI:10.1177/10567895241275380
摘要
Enhancing our understanding of the damage evolution in pre-heated rock is essential for safer design practices. Accordingly, a mechanical damage variable that accurately depicts the initial damage recovery process was proposed. Subsequently, a damage constitutive model is developed based on the generalized equivalent strain principle, enabling the identification of the initial nonlinear characteristics exhibited in the stress-strain curve. By integrating the above constitutive model with a statistical damage model that considers the residual strength based on the Weibull distribution, a comprehensive piecewise damage constitutive model specifically designed for pre-heated rocks was derived. The model consists of eight parameters, which can be directly determined through experimental results or readily obtained by fitting of the stress-strain data. A comparison of experimental data from multiple pre-heated rock types subjected to uniaxial compression is performed to validate the proposed model, revealing a strong agreement between the theoretical and experimental results. The comparison results demonstrate that the proposed model effectively captures the nonlinearity of the stress-strain curve throughout various stages, including the initial compaction, linear elastic, and strain-hardening stages before reaching the peak stress, as well as the subsequent strain-softening and residual stages. Furthermore, the proposed damage constitutive model elucidates the influence of temperature on crucial factors such as the elastic modulus, peak stress, residual strength, and stress-strain curve of pre-heated rocks, thereby enhancing its applicability in the design of deep underground rock projects.
科研通智能强力驱动
Strongly Powered by AbleSci AI