Mechanical properties of rock samples with a single natural weak plane after freeze-thaw action

被引：20
作者：
Lu, Yani [1 ]
Li, Xinping [2 ]
Han, Yanhua [1 ]
Wu, Jing [1 ]
机构：
[1] Hubei Engn Univ, Sch Civil Engn, Xiaogan 432000, Hubei, Peoples R China
[2] Wuhan Univ Technol, Key Lab Roadway Bridge & Struct Engn, Wuhan 430070, Hubei, Peoples R China
来源：
COLD REGIONS SCIENCE AND TECHNOLOGY | 2021年 / 181卷
基金：
中国国家自然科学基金;
关键词：
Sandstone; Freeze-thaw cycle; Structural plane angle; Uniaxial/triaxial compression test; Single discontinuity theory; DAMAGE CONSTITUTIVE MODEL; COMPRESSIVE STRENGTH; CRACKING PROCESSES; COALESCENCE; SANDSTONE; CYCLES; BEHAVIOR; DEGRADATION; PROPAGATION; SPECIMENS;
D O I：
10.1016/j.coldregions.2020.103179
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
The freeze-thaw cycle test and uniaxial/triaxial compression test were carried out on sandstone specimens with different structural plane angles, and the variation of sandstone strength with the structural plane angle of a single-group structural plane was studied. The results show that the strength variation law established by the single discontinuity theory is in good agreement with the uniaxial and triaxial test results, and that these can correctly reflect the strength variation law of sandstone. Under a certain cell pressure, the sandstone strength declines with the number of freeze-thaw cycles. Under a certain number of freeze-thaw cycles, the sandstone strength improves with the cell pressure. The strength difference of rock samples with different structural plane angles decreases with the cell pressure and freeze-thaw cycles. Sample failure modes vary with the structural plane angles. When 0 degrees < alpha < alpha(1), the rock sample undergoes splitting tension failure through the matrix and bedding plane, with a few shear cracks. When alpha(1) <= alpha <= alpha(2), the shear failure of sandstone occurs only along the structural plane. When alpha(2) <= alpha <= 90 degrees, the splitting failure of the rock sample occurs along the axis direction.
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页数：9
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