坡顶加载时黏性土坡土钉加固前后的离心模型试验比较研究

为研究坡顶加载条件下黏性土坡的承载特性和变形规律，进行了素土坡和土钉加固土坡的加载离心模型试验。测量了土坡的承载和变形过程。通过对比两种土坡的承载特性和变性规律，土钉的加固作用体现在：限制了土坡向坡面方向的位移，使土坡的承载能力得到了明显提高；在加固土坡内形成的土钉影响区域改善了加载底板边缘处的薄弱程度；增大了土坡中上部土体的竖向压缩变形，减小了剪切变形，增强了土坡的稳定性。土坡上部土钉的加固效果随着坡顶荷载的增大而越明显；土坡中下部土与土钉的相互作用越靠近坡面越强

Comparison between unreinforced and soil nail-reinforced cohesive soil slopes under load condition in centrifuge model tests

In order to investigate the bearing behavior and deformation rules of cohesive soil slopes during crest loading, centrifuge model tests of unreinforced slope and soil nail-reinforced slope were conducted. The loading and deformation process were observed and measured. Based on the comparison of bearing capacity and deformation rules between the unreinforced and soil nail-reinforced slope, the results show that soil nails improve the bearing capacity of slope obviously by confining the displacement toward slope surface. The deformation on the weakest location-footing edge is enhanced due to a nail-influence zone formed in reinforced slope; compression deformation of soil in middle and upper parts of slope is increased and shear deformation of which is decreased, resulting in the strengthening of slope stability. Soil nails in upper parts of reinforced slope has much more significant effects on reinforcing as load increased. Also in middle and lower parts of slope, the interaction between soil and nails becomes intensive near the slope surface.