Radial flow behaviors of a rough Beishan granite fracture under normal and thermal loadings

IF 8.2 1区 工程技术 Q1 ENGINEERING, CIVIL
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引用次数: 0

Abstract

During the operation of a deep geological repository in crystalline rocks for disposal of high-level radioactive waste, understanding the seepage behaviors of fractured crystalline rocks under coupled thermo-hydro-mechanical conditions is essential for the performance assessment of deep geological repositories. In this study, radial flow tests on cylindrical Beishan granite specimens with a single artificial fracture were conducted using the MTS 815 rock mechanics testing system to investigate the influence of normal stress and temperature on radial flow behaviors of rough rock fractures. Steady state method was used to measure fracture permeability, and an axial extensometer was used to measure fracture deformation during compression. A three-dimensional blue light scanner was used to characterize fracture surface morphology. Experimental results indicate that fracture permeability decreases nonlinearly with the increase of normal stress or temperature, and normal stress has a more significant influence on fracture permeability than temperature. The evolution of three-dimensional non-uniform distribution of voids under compression was numerically obtained, and the variogram was employed to quantify the non-uniform distribution characteristics of mechanical apertures. In addition, a radial flow model considering non-uniform distribution of apertures is proposed to predict the normal stress- and temperature-dependent seepage behaviors of rock fractures, and the predictions were found to be in good agreement with experimental data.

粗糙北山花岗岩断裂在法向载荷和热载荷作用下的径向流动行为
在处置高放射性废物的结晶岩深部地质处置库运行期间,了解热-水-力学耦合条件下断裂结晶岩的渗流行为对于深部地质处置库的性能评估至关重要。本研究使用 MTS 815 岩石力学测试系统对具有单一人工裂缝的圆柱形北山花岗岩试样进行了径向流动测试,以研究法向应力和温度对粗糙岩石裂缝径向流动行为的影响。采用稳态法测量断裂渗透率,轴向拉伸仪测量压缩过程中的断裂变形。三维蓝光扫描仪用于描述裂缝表面形态。实验结果表明,随着法向应力或温度的增加,断裂渗透率呈非线性下降,法向应力比温度对断裂渗透率的影响更大。通过数值计算获得了空隙在压缩条件下三维非均匀分布的演变过程,并利用变异图量化了机械孔隙的非均匀分布特征。此外,还提出了一种考虑孔隙非均匀分布的径向流动模型,用于预测岩石裂缝的法向应力和温度依赖性渗流行为,并发现预测结果与实验数据十分吻合。
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来源期刊
Underground Space
Underground Space ENGINEERING, CIVIL-
CiteScore
10.20
自引率
14.10%
发文量
71
审稿时长
63 days
期刊介绍: Underground Space is an open access international journal without article processing charges (APC) committed to serving as a scientific forum for researchers and practitioners in the field of underground engineering. The journal welcomes manuscripts that deal with original theories, methods, technologies, and important applications throughout the life-cycle of underground projects, including planning, design, operation and maintenance, disaster prevention, and demolition. The journal is particularly interested in manuscripts related to the latest development of smart underground engineering from the perspectives of resilience, resources saving, environmental friendliness, humanity, and artificial intelligence. The manuscripts are expected to have significant innovation and potential impact in the field of underground engineering, and should have clear association with or application in underground projects.
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