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首页> 外文期刊>Geotechnical testing journal >Assessing the Hydro-Mechanical Behavior of Collapsible Soils Using a Modified Triaxial Test Device
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Assessing the Hydro-Mechanical Behavior of Collapsible Soils Using a Modified Triaxial Test Device

机译：使用改进的三轴试验装置评估湿陷性土壤的水力-力学行为

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Unsaturated loessial Aeolian deposits tend to experience significant volumetric compression when subjected to loading. This behavior is generally attributed to their open, unstable soil fabric and their weak inter-particle bonding forces, which together yield a soil void structure that is susceptible to collapse. The current study examines two possible mechanisms of pore collapse in a loessial soil: pore collapse induced by an increase in net confining stresses under constant matric suction conditions, such as what occurs when a new structure is constructed on top of a collapsible soil deposit, and pore collapse induced by a change in matric suction conditions under a constant net confining stress, such as what occurs when a collapsible soil deposit beneath an existing structure experiences significant wetting due to a large precipitation event. To accomplish this task, an innovative test approach was used to assess the hydro-mechanical behavior of a highly collapsible loessial soil. The test setup incorporates a set of electronic pressure regulators coupled with three electronic pressure sensors to measure and control the applied pressures, and two high-precision digital volume change measuring devices to measure changes in the volume of the specimen and its degree of saturation. Using this approach, "undisturbed" loess specimens are subjected to either isotropic compression at a constant matric suction, or wetting-induced collapse at a constant mean net stress. Results indicate that the hydro-mechanical behavior of collapsible soils is considerably stress-path dependent. For the same values of mean net stress, the deformation measurements of specimens subjected to isotropic compression were often larger than those subjected to wetting-induced collapse. For the isotropic compression tests, it was shown that the soil water retention curve of the soil depends on the mean net stress. Less sensitivity to the mean net stress was observed for specimens subjected to wetting-induced collapse.
机译：不饱和的黄土风积沉积物在承受载荷时往往会经历明显的体积压缩。这种现象通常归因于其开放的，不稳定的土壤织物和较弱的颗粒间结合力，它们共同产生易于塌陷的土壤孔隙结构。当前的研究研究了黄土土壤孔隙塌陷的两种可能机制：在恒定的基质吸力条件下，净围压应力增加引起的孔隙塌陷，例如在可塌陷的土壤沉积物上构造新结构时发生的孔隙塌陷；以及在恒定的净围压下，由于基质吸力条件的变化而导致的孔隙塌陷，例如，在现有结构下的可塌陷的土壤沉积物由于大的降水事件而发生明显的润湿时会发生这种情况。为了完成此任务，采用了创新的测试方法来评估高度可塌陷的黄土的水力-机械性能。该测试装置包括一组电子压力调节器，三个电子压力传感器以测量和控制所施加的压力，以及两个高精度数字体积变化测量装置以测量样品体积及其饱和度的变化。使用这种方法，“不受扰动”的黄土样品要么在恒定的基质吸力下受到各向同性压缩，要么在恒定的平均净应力下受到湿润引起的塌陷。结果表明，湿陷性土壤的水力力学行为在很大程度上取决于应力路径。对于相同的平均净应力值，经受各向同性压缩的试样的变形测量​​值通常要大于受润湿引起的塌陷的变形测量​​值。对于各向同性压缩测试，表明土壤的土壤保水曲线取决于平均净应力。观察到湿润塌陷的样品对平均净应力的敏感性较低。

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