Evolution law of water-rock interaction on the shear behavior of granite fractures

被引：0
|
作者：
Dou Z. [1 ]
Zhao Z. [1 ]
Gao T. [2 ]
Li J. [2 ]
Yang Q. [3 ]
机构：
[1] Department of Civil Engineering, Tsinghua University, Beijing
[2] Department of Mechanical Engineering, Tsinghua University, Beijing
[3] Department of Hydraulic Engineering, Tsinghua University, Beijing
来源：
Zhao, Zhihong (zhzhao@tsinghua.edu.cn) | 1600年 / Tsinghua University卷 / 61期
关键词：
Direct shear test; Granite fractures; Nanoindentation; Water-rock interaction;
D O I：
10.16511/j.cnki.qhdxxb.2021.21.027
中图分类号：
学科分类号：
摘要：
To study the influence of water-rock interaction on the shear behavior of granite fractures, direct shear tests were conducted on Beishan granite fracture samples that were dry or immersed in water for different durations. The immersion affected the shear properties of granite fractures in terms of decreasing peak strength, shear stiffness and dilation, and increasing peak shear displacement. The three-dimensional morphologies of fracture surfaces before and after shear were recorded using a three-dimensional blue light scanner, and the volume changes of sheared-off asperities were calculated. With increased immersion duration, the volume of the sheared-off asperities increased significantly, and an empirical expression is proposed to describe this relation. Moreover, a nanoindentation test was conducted on the granite surfaces under dry and immersed for 12 months conditions. The maximum indentation depth and plastic deformation of the immersed granite samples were significantly larger than those of the dry samples. The nanohardness and Young's modulus of the granite samples decreased significantly after the long-duration immersions, which indicated that the fracture asperities were damaged more easily after the immersions. © 2021, Tsinghua University Press. All right reserved.
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页码：792 / 798
页数：6
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