An analytical model for the triaxial compressive stress-strain relationships of Cemented Pasted Backfill (CPB) with different curing time

Xiu, Z; Wang, S; Ji, Y; Wang, F; Ren, F; Wang, P

Abstract

The strength of Cemented Pasted Backfill (CPB) is gradually enhanced with the increase of curing time. It is of great significance to study the stress-strain behaviors of CPB with different curing time under triaxial loading conditions. The triaxial compressive tests of CPB samples with 4 different curing time (1, 3, 7, and 28 days) were firstly conducted using GCTS (Geotechnical Consulting ＆ Testing System) loading system under 4 different lateral constraint ratios (σ3/UCS≈0%, 10%, 20%, and 30%). The experimental data were then used to develop a damage constitutive model in which the lateral constraint rations σ3/UCS plays a key role. The tested stress-strain curves from the experiments were used to verify the proposed damage constitutive model. The comparisons between the tests and the model prediction showed that the triaxial strength of CPB can be accurately predicted by the Mohr-Coulomb strength criterion. An obvious secondary elastic strengthening stage was identified in the stress-strain curves of CPB when σ3/UCS is high (≥20%). And the proposed damage constitutive model can accurately represent the stress-strain relationships of CPB with different curing time and σ3/UCS. The results presented in this study contribute to a better understanding of the triaxial mechanical behaviors of CPB.

Citation

Xiu, Z., Wang, S., Ji, Y., Wang, F., Ren, F., & Wang, P. (2021). An analytical model for the triaxial compressive stress-strain relationships of Cemented Pasted Backfill (CPB) with different curing time. Construction and Building Materials, 313, 125554. https://doi.org/10.1016/j.conbuildmat.2021.125554

• Journal Article Type: Article
• Acceptance Date: Nov 3, 2021
• Online Publication Date: Nov 12, 2021
• Publication Date: Dec 27, 2021
• Deposit Date: Dec 6, 2021
• Publicly Available Date: Nov 12, 2022
• Journal: Construction and Building Materials
• Print ISSN: 0950-0618
• Publisher: Elsevier
• Volume: 313
• Pages: 125554
• DOI: https://doi.org/10.1016/j.conbuildmat.2021.125554
• Publisher URL: https://doi.org/10.1016/j.conbuildmat.2021.125554
• Related Public URLs: http://www.journals.elsevier.com/construction-and-building-materials/
• Additional Information: Funders : National Natural Science Foundation of China;Liaoning Science and Technology Project;Fundamental Research Funds for the Central Universities; Grant Number: U1602232; Grant Number: 2019JH2/10100035; Grant Number: 2101018