Experimental Study on Shear Strength Characteristics of Artificial Freeze-thaw Red Clay Soil
1. School of Civil and Construction Engineering, Donghua University of Science and Technology, Nanchang 330013, China
2. China Railway 16th Bureau Group Road and Bridge Engineering Co, Beijing 101500, China
3. Construction Engineering College, Jiangsu Open University, Nanjing 214257, China
| Abstract: | Artificial ground freezing method is commonly used in shield tunnel end ground reinforcement, contact channel excavation and other water-rich ground reinforcement, in order to explore the construction process of artificial freezing method of red clay through room temperature, freezing and freezing and thawing three states of shear strength change rule, using conventional straight shear test, to carry out the different moisture content, freezing temperature and the three different freezing and thawing state of artificial freezing and thawing of the red clay shear strength characteristics of experimental research to reveal different conditions of the change rule of the soil shear strength. Under different conditions, the soil shear strength change rule. The results show that: (1) The freezing state of red clay shear strength increased significantly, compared with the room temperature state increased by 5.7 times, and the friction angle and cohesion within the soil are increased. (2) The freezing state of red clay specimens shear strength with the increase of water content is first increased and then decreased, in the water content of 30% of the maximum shear strength of 550kPa. And the lower the freezing temperature, the greater the shear strength, in -15°C freezing state maximum shear strength of 550kPa. The maximum shear strength reaches 580kPa in -15°C freezing condition. After freezing and thawing, the structure of red clay is disturbed, the sensitivity is increased, the shear strength is affected by the water content and freezing temperature, which is more obvious than the change of the normal temperature state specimen. (3) The lower the freezing temperature is, the greater the shear strength of red clay in the freezing condition is. The maximum shear strength, the adhesive force and the angle of internal friction of red clay in the freezing condition are increased significantly. After freezing and thawing the shear strength of red clay is reduced compared with the normal temperature state. After freezing and thawing, the shear strength of red clay decreased. The results of the study are of some significance in guiding the artificial freezing reinforcement of red clay strata. |
| Keywords: | Artificial Ground Freezing Method; Red Clay; Shear Strength; Direct Shear Test |
| DOI: | 10.57237/j.cear.2023.03.001 |
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Received: 23 August 2023
Accepted: 20 September 2023
Published Online: 9 October 2023
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