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围岩气体渗透特性是影响高放废物处置库长期安全性的重要因素。以中国高放废物地质处置首选预选区——甘肃北山预选区的黑云母二长花岗岩为研究对象,开展了不同饱和度条件下的气体渗透率试验研究。首先利用真空饱和法获得了饱和试样,之后在6种不同相对湿度环境下完成了饱和花岗岩失水过程的监测,并测试了不同饱和度条件下的气体渗透率。随后分别在高放废物地质处置工程围岩预设最高温度90℃及沸点以上105℃条件下完成试样干燥过程,同时测试了干燥条件下的气体渗透率。基于测试结果,计算获得了花岗岩水分特征曲线,并分析了饱和度与气体相对渗透率的对应关系,并提出了数学描述模型。
The permeability of surrounding rock gas is an important factor affecting the long-term safety of HLW disposal repository. Taking the biotite monzogranite in Beishan Preselected area, Gansu Province, the preferred preselected area for geological disposal of high level radioactive waste as the research object, experiments on gas permeability under different saturation conditions were carried out. First, saturated samples were obtained by vacuum saturation method. Then the water loss of saturated granite was monitored under 6 different relative humidity conditions and the gas permeability under different saturation conditions was tested. Subsequently, the sample drying process was completed at a preset maximum temperature of 90 ° C and a boiling point of 105 ° C, respectively, for the geological disposal of high-level radioactive waste and the gas permeability under dry conditions was also tested. Based on the test results, the water characteristic curve of granite was calculated and the corresponding relationship between saturation and gas relative permeability was analyzed. A mathematical description model was proposed.