TEST STUDY ON SHEAR STRENGTH OF UNSATURATED SOILS
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摘要: 设计并运行了饱和土的常规三轴试验、压力板试验和普通三轴试验、压力板试验和GDS三轴试验与自然风干试验和普通三轴试验等四种试验，着重考察了高饱和度和水封闭两个特殊情况下非饱和土的强度特征和破坏特点。试验表明：在高饱和度条件下，与基质吸力相关联的摩擦角大于与净总应力相关联的摩擦角；在水封闭条件下，强度增长与基质吸力增加基本成线性关系。从宏观破坏特点看，非饱和试样的破坏发生在某个明显的斜截面上，这与饱和试样的破坏特点是不同的。Abstract: In order to verify the suction constitution in unsaturated soils, some un-hygroscopic tests are designed and performed. The testes are classified into four different types including common triaxial tests, pressure plate & common triaxial tests, pressure plate & GDS triaxial tests and natural air drying & common triaxial tests. The results indicate that the friction angle related to unsaturation can be greater than that induced by net normal stress in a higher saturation state and the strength increment induced by unsaturation is linear to matric suction in a lower saturation state. Failure occurs distinctly in a slope for unsaturated soil samples but this is not true for the saturated one.
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Keywords:
- soil and foundation /
- unsaturated soil /
- un-hygroscopic path /
- GDS triaxial test /
- shear strength
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