【摘要】 天水市是中国黄土滑坡分布最密集、灾害最严重的地区之一。大面积的挖填方会改变场区的地下水渗流场，从而影响高填方边坡的稳定性。以天水地区马兰黄土为研究对象，通过野外详勘与室内物理模拟试验，对马兰黄土高填方边坡的渗透变形机理进行研究。结果表明：受填方前原始地形的影响，凹陷地形易于汇水，地下水流动受阻，易形成积水区，使地下水位抬升高度较大。随着时间的累积，地下水不断浸泡地基土，使其强度劣化，加之毛细水上升作用使地基发生湿馅和湿化沉降，易在边坡坡脚等富水区产生蠕滑变形，并牵引边坡后缘发生滑移拉裂，发生渐进式破坏而引发较大规模的边坡滑移。通过物理模拟，得出该地区马兰黄土高填方边坡受地下水影响产生的变形滑移模式为“渐进后退-牵引式滑移”。更多还原

【Abstract】 Tianshui City is one of the most densely distributed and disaster-prone areas of loess landslides in China. The large area of dredging and filling will change the groundwater seepage field of the site, thus affecting the stability of the high-fill slope. Taking Malan loess in Tianshui area as the research object, the infiltration deformation mechanism of Malan loess high-fill slope was investigated through detailed field survey and indoor physical simulation test. The results show that: influenced by the original topography before filling, the depressed topography is easy to catch water, the groundwater flow is obstructed, and the ponding area is easy to form, so that the groundwater level is raised to a larger height. With the accumulation of time, the groundwater continuously soak the foundation soil, so that its strength deterioration, coupled with the role of capillary water rise to make the foundation wet filling and wetting settlement, so that the foot of the slope and other water-rich areas are prone to creep slip deformation, and implicate the back edge of the slope slip pulling crack, thus producing progressive damage and triggering a larger-scale slope slip. Through physical simulation, it is concluded that the deformation slip mode of the high fill slope of Malan loess in this area is “progressive backward-traction slip” due to the influence of groundwater.更多还原