论文部分内容阅读
为了解干湿循环作用下膨胀土边坡的吸力、孔隙水压力、胀缩变形的变化,开展了室内膨胀土边坡模型试验,测定了干湿循环条件下膨胀土边坡表层土体的吸力、孔隙水压力、胀缩变形的变化情况,绘制了相应的时程曲线及表面轮廓线.试验结果表明:随着干湿循环次数的增加,裂缝逐渐变宽变深,吸力和孔隙水压力在降雨工况下的变化幅度增大;水平顺坡向位移在干湿循环过程中表现为递增趋势,竖向位移在干湿循环中表现出明显的胀缩性;膨胀土边坡的隆起变形在每次干湿循环后均有所增加,且坡脚和坡底处的隆起变形量较其余部位更为明显.
In order to understand the change of suction, pore water pressure and expansion and contraction deformation of expansive soil slope under the action of wetting and drying cycles, the indoor expansive soil slope model test was carried out. The suction of surface soil under expansive soil slope under wetting and drying conditions , The pore water pressure and the expansion and contraction deformation, the corresponding time history curve and the surface contour line were plotted.The experimental results show that with the increase of the number of drying and wetting cycles, the crack becomes wider and deeper and the suction and pore water pressure are in the range of The variation range under rainfall condition increased. The horizontal and vertical displacement showed an increasing trend during the wet-dry cycle, and the vertical displacement showed obvious expansion and contraction during the wet-dry cycle. The swelling deformation of the expansive soil slope was in the After each wetting and drying cycles have increased, and the slope foot and slope at the end of the bulge deformation is more obvious than the rest.