Freeze-thaw performance and micro-mechanism of canal foundation silt treated by MICP

ZHU Rui; XING Wei; GUO Wanli; HUANG Yinghao; ZHOU Feng; WANG Xudong

doi:10.11779/CJGE20231014

Volume 47 Issue 2

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Chinese Journal of Geotechnical Engineering > 2025 > 47(2): 376-387. > DOI: 10.11779/CJGE20231014

ZHU Rui, XING Wei, GUO Wanli, HUANG Yinghao, ZHOU Feng, WANG Xudong. Freeze-thaw performance and micro-mechanism of canal foundation silt treated by MICP[J]. Chinese Journal of Geotechnical Engineering, 2025, 47(2): 376-387. DOI: 10.11779/CJGE20231014

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Freeze-thaw performance and micro-mechanism of canal foundation silt treated by MICP

ZHU Rui^{1, 2, 3, 4,},
XING Wei¹,
GUO Wanli⁴,
HUANG Yinghao⁴,
ZHOU Feng¹,
WANG Xudong¹

1.
College of Transportation Engineering, Nanjing Tech University, Nanjing 211816, China
2.
Postdoctoral Station of Civil Engineering, Army Engineering University of PLA, Nanjing 210007, China
3.
State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100038, China
4.
Key Laboratory of Dam Reservoir Safety of the Ministry of Water Resources, Nanjing Hydraulic Research Institute, Nanjing 210029, China

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Received Date: October 14, 2023
Available Online: May 19, 2024

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Abstract

Abstract

The freeze-thaw deterioration characteristics of foundation soil are the main cause for damages of canal slopes in seasonally frozen areas. The soil treatment is an important means to ensure the safe operation of canals. Based on the microbially induced calcium carbonate precipitation (MICP) technique, a series of laboratory tests on treated silt with different concentrations, curing ages and freeze-thaw cycles are conducted. The macro-and micro-indices of treated silt, such as volumetric rate, permeability coefficient and porosity, are described, and their quantitative relationships are established. The results show that under different concentrations and curing ages, the treatment can reduce the freeze-thaw deformation by 70%, decrease the permeability coefficient by at least one order of magnitude, increase the compressive strength by 220.17%, and improve the shear strength index by 65.50%. As the concentration is 1.00 mol/L and the curing age is 28 days, the treatment effects of silt under freeze-thaw cycles are the most significant. In addition, the calcium carbonate precipitation induced by the MICP reshapes the microstructure of silt through a series of processes such as filling, cementation and encapsulation, which ensures the integrity of silt subjected to freeze-thaw cycles. It is also the main reason for the good engineering properties of treated silt in freeze-thaw environments.
- MICP,
- silt,
- canal slope,
- freeze-thaw,
- micro-structure

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