Creep characteristics of frozen sand-concrete interface considering influence of interface roughness

被引：0

作者：

He F. ^{[1
]}

Chen H. ^{[1
]}

Wang X. ^{[1
]}

Li J. ^{[2
]}

Guo C. ^{[1
]}

机构：

[1] School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou

[2] Maintenance Company, State Grid Qinghai Electric Power Company, Xining

来源：

Journal of Railway Science and Engineering | 2023年 / 20卷 / 01期

关键词：

contact surface; creep test; frozen sand-concrete; model; roughness;

D O I：

10.19713/j.cnki.43-1423/u.T20220261

中图分类号：

学科分类号：

摘要：

To ensure the safety and stability of the bridge pile foundation under use in permafrost area, it is necessary to research the bearing capacity of the pile tip and the bearing performance of pile shaft. The bearing performance of pile shaft of the creep characteristics of the pile-frozen soil interface often plays a great role in the long-term stability of the foundations in permafrost area. The self-developed large-scale stress-controlled shearing apparatus was used to study the shear creep characteristics of the frozen sand-concrete interface. Besides, the roughness of the concrete surface was calculated with the sand filling method in the experiments. There were four experimental analysis groups (with roughness of 0, 0.039, 0.059 and 0.098 mm) and one model validation group (with roughness of 0.02 mm). according to those experiments, the variation laws were studied including the creep deformation, creep rate and time and changes of roughness in order to figure out the shear creep mechanism of the interface affected by roughness and then, and to establish the creep model. It is found that there is a significant creep effect in the frozen sand-concrete interface under constant loading. With different roughness, the creep characteristics of the frozen sand-concrete interface are different. Namely, the greater the roughness, the longer the creep time in decay, the more obvious the stable creep, and the stronger the creep stability. The creep velocity decreases with the increase of roughness, which is linear variation. Besides, the critical roughness for non-attenuated creep is 0.093 mm. Moreover, the phenomenological creep model has good adaptability to the creep curve of the interface. It will play a part in predicting the creep law of the specimens with different roughness. The results can provide the basis for calculating the long-term bearing capacity and deformation of the pile foundation in permafrost region area. © 2023, Central South University Press. All rights reserved.

引用

页码：200 / 209

页数：9

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