Abstract 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° ≤ α ≤ α1, the rock sample undergoes splitting tension failure through the matrix and bedding plane, with a few shear cracks. When α1 ≤ α ≤ α2, the shear failure of sandstone occurs only along the structural plane. When α2 ≤ α ≤ 90°, the splitting failure of the rock sample occurs along the axis direction.

中文翻译：

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冻融作用后具有单一天然弱面的岩石样品的力学特性

摘要 对不同结构面角度的砂岩试件进行了冻融循环试验和单轴/三轴压缩试验，研究了砂岩强度随单组结构面结构面角度的变化规律。结果表明，单不连续性理论建立的强度变化规律与单轴和三轴试验结果吻合较好，能正确反映砂岩强度变化规律。在一定的细胞压力下，砂岩强度随着冻融循环次数的增加而下降。在一定次数的冻融循环下，砂岩强度随着细胞压力的增加而提高。不同结构面角度的岩样强度差异随着细胞压力和冻融循环的增加而减小。样品失效模式随结构平面角度而变化。当0°≤α≤α1时，岩样通过基体和层理面发生劈裂拉伸破坏，并伴有少量剪切裂缝。当α1≤α≤α2时，砂岩的剪切破坏仅沿构造面发生。当α2≤α≤90°时，岩样沿轴向发生劈裂破坏。