杨福波,陈世万,田云雷,贺琦

• 1:贵州大学资源与环境工程学院喀斯特地质资源与环境教育部重点实验室
• 2:中国科学院武汉岩土力学研究所

摘要(Abstract)：

花岗岩是高放废物地质处置库的主要围岩体。为认识温度改变对北山花岗岩渗透特性的影响，采用多功能岩石低渗测试系统，以氮气为渗透介质，测试了北山花岗岩升温-降温全过程中渗透率(分别加热至120℃、140℃和160℃)。试验结果表明，升温-降温全过程北山花岗岩渗透率在0.055～0.1 mD范围内，在升温阶段，渗透率随温度的升高呈现降低的趋势；在降温过程的高温阶段，渗透率随温度的降低持续降低；温度降至60℃水平时渗透率出现回升趋势，但不能恢复至初始渗透率；通过核磁共振对比试验前后试样孔隙特征发现，温度渗流处理后北山花岗岩孔隙结构出现了不可逆改变，大孔段孔径分布曲线峰值对应的孔径大小及孔隙量均出现显著降低，温度对花岗岩孔隙表现明显的不可逆愈合作用，导致北山花岗岩渗透率降低。研究成果对花岗岩体内高放废物地质处置工程具有重要意义。

关键词(KeyWords)： 渗透率;热处理;花岗岩;热致裂隙;滑脱效应;滑脱因数

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划(2019YFC1805300);; 国家自然科学基金(41902301);; 岩土力学与工程国家重点实验室开放基金课题(Z018023)

作者(Author): 杨福波,陈世万,田云雷,贺琦

DOI: 10.13928/j.cnki.wrahe.2022.06.010

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