Constitutive Damage Model of Dry-wet Cycles of Filled Jointed Rock Considering the Initial Compaction Stage
The compression process of filled jointed rock under dry-wet cycles exhibits a distinct initial compaction stage; however, existing rock damage models rarely account for the filling characteristics of joints, making it difficult to accurately describe the nonlinear deformation during the initial com...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Editorial Department of Journal of Sichuan University (Engineering Science Edition)
2025-07-01
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| Series: | 工程科学与技术 |
| Subjects: | |
| Online Access: | http://jsuese.scu.edu.cn/thesisDetails#10.12454/j.jsuese.202400463 |
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| Summary: | The compression process of filled jointed rock under dry-wet cycles exhibits a distinct initial compaction stage; however, existing rock damage models rarely account for the filling characteristics of joints, making it difficult to accurately describe the nonlinear deformation during the initial compaction stage. In response to this, the present study conceptualizes the filled jointed rock as consisting of two components: voids and non-voids. The compaction deformation of the filled jointed rock is calculated based on the deformation coordination relationship of the voids. The study analyzes the mechanical deformation process of filled jointed rock by treating the micro-element strength as the limit using statistical damage theory and establishes a compression elastoplastic uniaxial compression damage mechanics equation for jointed rock. A method is provided for determining the parameters of the damage mechanics model, and the model is verified through parameter analysis and damage degree analysis using compression test data from filled jointed rock samples under dry-wet cycles. The results indicated that the degree of damage to rock samples caused by dry-wet cycles increases gradually with the number of cycles, demonstrating a continuous increase in the proportion of voids. However, the damage caused by compression gradually lags, reflecting the environmental deterioration characteristics of jointed rock. The model constructed in this study effectively analyzes the compressive mechanical properties of filled jointed rock under dry-wet cycles and holds practical engineering significance. |
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| ISSN: | 2096-3246 |