[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。
[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.