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目前,国内对于非饱和土的增湿直剪研究还不够完善,该文利用应力式非饱和直剪仪进行一定剪应力条件的均匀增湿直剪试验,通过加装流量计,精确控制增湿含水量,研究了增湿剪切过程中剪切位移、竖向位移以及基质吸力的变化规律。试验结果表明:增湿剪切位移随竖向压力的增大而逐渐变小,增湿竖向位移在竖向压力为200kPa时最大;基质吸力随竖向压力的增大而略微增大;浸水后试样的粘聚力减小较多,内摩擦角基本不变。
At present, the research on humidification and direct shear of unsaturated soils in our country is still not perfect. In this paper, we use the stress-type non-saturated shear shear instrument to conduct a uniform humidification direct shear test under certain shear stress conditions. By adding a flowmeter, Water content, shear displacement, vertical displacement and matrix suction variation during humidification and shearing were studied. The experimental results show that the displacement of humidification shear decreases with the increase of vertical pressure, and the vertical displacement of humidification is the maximum when the vertical pressure is 200 kPa. The suction of substrate increases slightly with the increase of vertical pressure. After the sample cohesion decreases more, the basic internal friction angle unchanged.