Rock Damage Model Considering Post-Peak Brittleness Characteristics

Wei Anhui; Mou Qi; Tang Wei; LiJunrun; Zhao Haisong

doi:10.20174/j.JUSE.2025.04.03

Chinese Journal of Underground Space and Engineering >

2025 , Vol. 21 >Issue 4: 1126 - 1136

DOI: https://doi.org/10.20174/j.JUSE.2025.04.03

Rock Damage Model Considering Post-Peak Brittleness Characteristics

Wei Anhui ,
Mou Qi ,
Tang Wei ,
LiJunrun ,
Zhao Haisong

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1. Sichuan Highway Planning, Survey, Design and Research Institute Co., Ltd., Chengdu 610041, P.R. China;
2. School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang, Sichuan 621010, P.R. China;
3. School of Civil Engineering, Guizhou University, Guiyang 550025, P.R. China;
4. Institute of Systems of Engineering, China Academy of Engineering Physics, Mianyang, Sichuan 621999, P.R. China

Received date: 2024-10-22

Online published: 2025-09-03

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Abstract

In response to the poor simulation performance of existing constitutive models for rock post-peak curves, a rock damage constitutive model that can reflect the brittle characteristics of rock post peak is proposed based on the assumption that the strength of rock microelements follows Weibull distribution and Drucker Prager failure criterion. The curve shape parameter β is introduced to modify the Young's modulus and damage factor of rock. Finally, the established constitutive model theoretical curve was compared and analyzed with the conventional triaxial stress-strain curves of three types of rocks (shale, marble, and granite), and combined with the analysis results of other similar models, the applicability and accuracy of the model proposed in this paper were confirmed. The results show that: The new model not only overcomes the defect of theoretical curves not reaching the origin, but also well describes the brittle characteristics of rocks after the peak and the influence of residual strength on the stress-strain behavior throughout the entire process. The model parameters is discussed . The larger the F value, the higher the peak strength, the larger the M value, the stronger the brittle characteristics before the peak, and the larger the β value, the stronger the ductility characteristics after the peak. The study results has certain reference value for the establishment of a comprehensive brittleness evaluation model for deep rock masses.

Key words： constitutive model; curve characteristics; model validation; parametric analysis; brittle characteristics

Cite this article

Wei Anhui , Mou Qi , Tang Wei , LiJunrun , Zhao Haisong . Rock Damage Model Considering Post-Peak Brittleness Characteristics[J]. Chinese Journal of Underground Space and Engineering, 2025 , 21(4) : 1126 -1136 . DOI: 10.20174/j.JUSE.2025.04.03

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