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相同条件下制备的重塑试样可能获得不同的土水特征曲线,导致试样的平衡饱和度存在差异,进而对非饱和土试样的力学性质产生影响。基于压力板仪对4个环刀试样的土水特征曲线进行量测,进而通过直剪试验对其力学性质进行研究。结果表明:土水特征曲线存在差异,而环刀的侧壁防护作用对土水特征曲线有重要影响;相同基质吸力下,饱和度对试样的力学性质影响明显,饱和度较小的试样具有较大的峰值强度,而饱和度相近的试样则表现出几乎一致的力学性质;撕裂带的产生对法向位移有着加成作用,但未对试样力学性质造成明显影响,而破坏面的凹凸情况将影响试样的峰值强度;受到试样与陶土板间连通性的影响,饱和度的差异可能随基质吸力的增大而反复出现。
The remolded samples prepared under the same conditions may obtain different soil-water characteristic curves, resulting in differences in the equilibrium saturation of samples, which in turn affect the mechanical properties of unsaturated soil samples. Based on the pressure plate instrument, the soil-water characteristic curves of four torch specimens were measured, and then their mechanical properties were studied by direct shear test. The results show that there are differences between the soil and water characteristic curves, while the sidewall protection of the ring knife has an important influence on the soil-water characteristic curve. Under the same substrate suction, the saturation has a significant effect on the mechanical properties of the sample. The specimens with similar saturation show nearly uniform mechanical properties. The generation of tearing zone has an additive effect on the normal displacement, but it does not affect the mechanical properties of the specimens obviously, but destroys The concavity and convexity of the surface will affect the peak intensity of the sample. Depending on the connectivity between the sample and the clay plate, the difference in saturation may appear repeatedly with the increase of the substrate suction.