- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | LIANG Jiguan, HUANG Linchong, MA Jianjun, CHEN Wanxian. Comparison of Stress-Dilatancy Rules and Research on Stress-Dilatancy Rule for Rocks[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20230231
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In order to evaluate the prediction accuracy of typical stress-dilatancy rules on the mechanical response of common geomaterials, propose a stress-dilatancy rule suitable for rocks, and improve the accuracy of the constitutive model, typical stress-dilatancy rules derived from experiment data were compared to propose a stress-dilatancy model suitable for rocks. Firstly, based on the thermodynamic framework and the energy conservation equation, three typical stress-dilatancy models were sorted out, and the stress-dilatancy data of various geomaterials were compared with the typical stress-dilatancy rules. Then, by taking the Rowe dilatancy model as the basic framework and considering the influence of many factors, an improved Rowe stress-dilatancy model suitable for rocks was proposed, and its fitting effect on the test data was analyzed. The simulation effect of the proposed model and the variable dilatancy angle model on the evolution of dilatancy angle during loading was compared. Finally, the modified Rowe dilatancy rule was coupled with the modified Cambridge model, and the simulation results and test data of the classical modified Cambridge model were compared and verified. The results show that the classical stress-dilatancy rule based on the pure friction hypothesis cannot accurately describe the stress-dilatancy response of geomaterials with cohesive force due to the influence of cohesive force. The modified Rowe dilatancy model can effectively reflect the stress-dilatancy response of rock and simulate the “turning hook” phenomenon in the data. Furthermore, the proposed stress-dilatancy model is not only simple in form but also has fewer parameters than the variable dilatancy angle model. The proposed modified Rowe dilatancy model can improve the accuracy of the constitutive model in deformation prediction.
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