Improvement of Duncan-Chang Constitutive Model of Argillaceous Siltstone Soil-Rock Mixture
Different from the stiff soil-rock mixture (S-RM), the soft blocks will break during the shear failure of the soft S-RM, so the shear mechanical properties of soft S-RM are affected by the block breakage properties. In order to accurately predict the deformation of soft S-RM slope and evaluate the e...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | zho |
| Published: |
Editorial Office of Pearl River
2024-01-01
|
| Series: | Renmin Zhujiang |
| Subjects: | |
| Online Access: | http://www.renminzhujiang.cn/thesisDetails?columnId=68439371&Fpath=home&index=0 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Different from the stiff soil-rock mixture (S-RM), the soft blocks will break during the shear failure of the soft S-RM, so the shear mechanical properties of soft S-RM are affected by the block breakage properties. In order to accurately predict the deformation of soft S-RM slope and evaluate the engineering stability, it is urgent to study the shear mechanical properties and constitutive models of S-RM. The shear mechanical properties and the block breakage properties of S-RM were analyzed by the large-scale triaxial test. Based on the relationship between breakage ratio <italic>B<sub>r</sub></italic> and damage ratio <italic>R<sub>f</sub></italic>, the Duncan-Zhang constitutive model suitable for S-RM was improved. The results show that after the shear failure of soft S-RM, the content of the block size group (5–60 mm) decreases, while that of the fine soil size group (<2 mm) increases. The block breakage ratio reaches 20% under high confining stress. With the increase in confining stress, the breakage ratio and shear strength of S-RM increase. With the increase in the breakage ratio <italic>B<sub>r</sub></italic>, the damage ratio <italic>R<sub>f</sub></italic> decreases linearly. Compared with the experimental data, the improved Duncan-Chang constitutive model can more reasonably characterize the stress-strain characteristics of S-RM. |
|---|---|
| ISSN: | 1001-9235 |