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Geomechanics and Engineering Volume 36, Number 2, January25 2024 , pages 145-156 DOI: https://doi.org/10.12989/gae.2024.36.2.145 |
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A comparative experimental study on the mechanical properties of cast-in-place and precast concrete-frozen soil interfaces |
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Guo Zheng, Ke Xue, Jian Hu, Mingli Zhang, Desheng Li, Ping Yang and Jun Xie
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| Abstract | ||
| The mechanical properties of the concrete-frozen soil interface play a significant role in the stability and service performance of construction projects in cold regions. Current research mainly focuses on the precast concrete-frozen soil interface, with limited consideration for the more realistic cast-in-place concrete-frozen soil interface. The two construction methods result in completely different contact surface morphologies and exhibit significant differences in mechanical properties. Therefore, this study selects silty clay as the research object and conducts direct shear tests on the concrete-frozen soil interface under conditions of initial water content ranging from 12% to 24%, normal stress from 50 kPa to 300 kPa, and freezing temperature of -3C. The results indicate that (1) both interface shear stress-displacement curves can be divided into three stages: rapid growth of shear stress, softening of shear stress after peak, and residual stability; (2) the peak strength of both interfaces increases initially and then decreases with an increase in water content, while residual strength is relatively less affected by water content; (3) peak strength and residual strength are linearly positively correlated with normal stress, and the strength of ice bonding is less affected by normal stress; (4) the mechanical properties of the cast-in-place concrete-frozen soil interface are significantly better than those of the precast concrete-frozen soil interface. However, when the water content is high, the former's mechanical performance deteriorates much more than the latter, leading to severe strength loss. Therefore, in practical engineering, cast-in-place concrete construction is preferred in cases of higher negative temperatures and lower water content, while precast concrete construction is considered in cases of lower negative temperatures and higher water content. This study provides reference for the construction of frozen soil-structure interface in cold regions and basic data support for improving the stability and service performance of cold region engineering. | ||
| Key Words | ||
| cold region engineering; concrete-frozen soil interface; frozen soil; interface bond strength; mechanical properties; peak strength; residual strength; silty clay | ||
| Address | ||
| Guo Zheng, Ke Xue, Jian Hu, Ping Yang and Jun Xie: College of Water Conservancy and Hydropower, Sichuan Agricultural University, 46 Xinkang Road, Yucheng District, Ya'an, China Mingli Zhang: School of Civil Engineering, Lanzhou University of Technology, 287 Langongping Road, Qilihe District, Lanzhou, China Desheng Li: School of Science, Nanjing University of Science and Technology, 200 Xiaoling Wei Street, Xuanwu District, Nanjing, China | ||