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应用改制的应力式直接剪切仪,首先对不同剪应力水平作用下原状黄土浸水饱和湿剪演化规律进行了研究;其次选取了一个剪应力水平对不同增湿浸水量作用下原状黄土和扰动黄土湿剪演化规律进行了进一步探索,并在此基础上定义了黄土水敏性结构参数mω。结果表明,黄土在湿剪过程中剪位移随时间变化曲线可以分为两个阶段:湿剪迅速发展阶段和湿剪稳定阶段;浸水饱和增湿后试样抗剪强度值受剪应力水平影响较小,竖向变形以增湿湿陷变形为主;而其水敏性结构参数在低固结压力、低含水率条件下对水的敏感性较强,在高固结压力、高含水率条件下对水的敏感性较小。
Using the modified direct shear stressor, the evolution law of saturation wet shear of undisturbed loess submerged under different shear stress levels was studied. Secondly, a shear stress level was selected to treat undisturbed loess and disturbed loess Wet shear evolution rules were further explored, and on the basis of which the water-sensitive structural parameter mω of loess was defined. The results show that the curve of shear displacement of loess under wet shear process can be divided into two stages: the rapid development of wet shear and the steady stage of wet shear; the shear strength of the specimen after saturated wetting is affected by the shear stress Small and vertical deformation is dominated by humidification and collapsible deformation. However, its water-sensitivity structural parameters are sensitive to water under low consolidation pressure and low water cut. Under the conditions of high consolidation pressure and high water cut Lower sensitivity to water.