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Permeability Characteristics of Bedrock Weathering Layer in Southern Coast Area of China
[Objective] The permeability characteristics of the bedrock weathering layer were determined in order to propose a corresponding experimental method of hydraulic conductivity, and thereby provide a scientific reference for the performance assessment of underground engineering facilities in a porous and fractured medium. [Methods] We focused on granite at an underground engineering site in the southern coastal area of China. A tension infiltrometer was used to conduct the infiltration tests on the bedrock weathering layer. A nonlinear regression model, the White and Sully method, a multi-pressure method, and the Smettem and Turner method were adopted to calculate the hydraulic conductivity and carry out a comprehensive and comparative analysis. The spatial distribution of the hydraulic conductivity of the bedrock weathering layer was determined based on a geologic statistical method. [Results] ① The hydraulic conductivity of the fully weathered bedrock in this area was between 0.023 and 3.918 m/d, and the measured mean value was around 0.971 m/d, which was consistent with the empirical value. ② The permeability capacity of the bedrock weathering layer in this area was stronger in the high terrain area than in the low terrain area. ③ There were some differences in hydraulic conductivity obtained by using different calculation methods. ④ The multi-pressure method was more suitable for determining the hydraulic conductivity in the study area. [Conclusion] The hydraulic conductivity of the bedrock weathering layer in the study area was obtained by using a tension infiltrometer and the multi-pressure method. The permeability capacity of the bedrock weathering layer was found to be relatively weak.
Permeability Characteristics of Bedrock Weathering Layer in Southern Coast Area of China
[Objective] The permeability characteristics of the bedrock weathering layer were determined in order to propose a corresponding experimental method of hydraulic conductivity, and thereby provide a scientific reference for the performance assessment of underground engineering facilities in a porous and fractured medium. [Methods] We focused on granite at an underground engineering site in the southern coastal area of China. A tension infiltrometer was used to conduct the infiltration tests on the bedrock weathering layer. A nonlinear regression model, the White and Sully method, a multi-pressure method, and the Smettem and Turner method were adopted to calculate the hydraulic conductivity and carry out a comprehensive and comparative analysis. The spatial distribution of the hydraulic conductivity of the bedrock weathering layer was determined based on a geologic statistical method. [Results] ① The hydraulic conductivity of the fully weathered bedrock in this area was between 0.023 and 3.918 m/d, and the measured mean value was around 0.971 m/d, which was consistent with the empirical value. ② The permeability capacity of the bedrock weathering layer in this area was stronger in the high terrain area than in the low terrain area. ③ There were some differences in hydraulic conductivity obtained by using different calculation methods. ④ The multi-pressure method was more suitable for determining the hydraulic conductivity in the study area. [Conclusion] The hydraulic conductivity of the bedrock weathering layer in the study area was obtained by using a tension infiltrometer and the multi-pressure method. The permeability capacity of the bedrock weathering layer was found to be relatively weak.
Permeability Characteristics of Bedrock Weathering Layer in Southern Coast Area of China
Xinyu Fu (author) / Jiebiao Li (author) / Qun Wu (author) / Tongtong Li (author) / Jingbo Zhao (author)
2022
Article (Journal)
Electronic Resource
Unknown
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