Permeability Characteristics of Bedrock Weathering Layer in Southern Coast Area of China

Fu Xinyu; Li Jiebiao; Wu Qun; Li Tongtong; Zhao Jingbo

doi:10.13961/j.cnki.stbctb.2022.06.029

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Permeability Characteristics of Bedrock Weathering Layer in Southern Coast Area of China

- Permeability Characteristics of Bedrock Weathering Layer in Southern Coast Area of China
- Bulletin of Soiland Water Conservation Vol. 42, Issue 6, Pages: 230-237(2022)
- 作者机构：
  
  1. 核工业北京地质研究院国家原子能机构高放废物地质处置创新中心,北京,100029
  2. 深圳中广核工程设计有限公司,广东,深圳,518000
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2022.06.029
  CLC： S152.7
- Published：2022
- 稿件说明：
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Fu Xinyu, Li Jiebiao, Wu Qun, et al. Permeability Characteristics of Bedrock Weathering Layer in Southern Coast Area of China[J]. Bulletin of Soiland Water Conservation, 2022, 42(6): 230-237.
DOI：

Fu Xinyu, Li Jiebiao, Wu Qun, et al. Permeability Characteristics of Bedrock Weathering Layer in Southern Coast Area of China[J]. Bulletin of Soiland Water Conservation, 2022, 42(6): 230-237. DOI： 10.13961/j.cnki.stbctb.2022.06.029.

摘要

[目的] 研究基岩地区地表风化层渗透特性，寻求其渗透系数的确定方法，可为孔隙-裂隙岩体地下工程的性能评价提供科学依据。 [方法] 以中国南部沿海花岗岩为研究对象，采用张力入渗仪，重点针对基岩风化层开展入渗试验研究，利用非线性回归法、多压力法、WS方法以及瞬态方法中的单盘测定法计算渗透系数，开展不同方法的综合对比与地质统计分析，确定研究区场地基岩表层风化层的渗透系数及其空间分布规律。 [结果] ①研究区基岩全风化层渗透系数分布在0.023～3.918 m/d，平均渗透系数约为0.971 m/d，与经验值相符； ②研究区地形较高处基岩风化层渗透能力相对较强，地形较低处渗透能力较弱； ③不同计算方法获得的渗透系数存在一定的差异性； ④多压力方法更适合研究区基岩风化层渗透系数的确定。 [结论] 研究区基岩风化层渗透系数可采用张力入渗仪和多压力方法确定，其渗透性能整体较弱。

Abstract

[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.

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