膨胀土堑坡格栅加筋柔性支护的数值模拟

发布时间：2018-04-18 16:52

本文选题：道路工程 + 膨胀土边坡　；参考：《公路交通科技》2016年06期

【摘要】：考虑降雨、蒸发等大气长期风化作用导致膨胀土抗剪强度的衰减,结合室内实测膨胀土非线性强度线确定抗剪强度参数,通过数值模拟,研究不同筋土界面强度参数、加筋层间距及坡面反包与否等因素对加筋膨胀土堑坡的影响。结果表明:土工格栅可有效约束边坡水平位移,一定程度上减小土体的吸湿膨胀软化效应,使可能的滑面向坡体深部转移;筋土界面强度参数对格栅的最大轴力影响很小,但安全系数会随其增大而增大;不同加筋间距条件下,各层格栅的最大轴力沿高度的变化规律基本相同,先增加后减小,且间距越小,其最大值越小;加筋间距对膨胀土边坡稳定性影响较大,间距越小,稳定性越好;坡面反包格栅能间接提高边坡的安全系数,及其耐冲刷性和坡体的整体性。
[Abstract]:Considering the long-term weathering in the atmosphere, such as rainfall and evaporation, the shear strength of expansive soil is attenuated. The shear strength parameters are determined by nonlinear strength line of expansive soil measured in laboratory. The interface strength parameters of different reinforced soils are studied by numerical simulation.The influence of the spacing of reinforced layer and the reverse inclusion of slope on the slope of reinforced expansive soil.The results show that geogrid can effectively constrain the horizontal displacement of slope, reduce the swelling softening effect of soil mass to a certain extent, make the possible sliding face to the deep of the slope, and the strength parameters of the interface between reinforcement and soil have little effect on the maximum axial force of the grid.However, the safety factor will increase with the increase of the height, and the maximum axial force along the height of each layer of grille is basically the same under the condition of different reinforcement spacing, which increases first and then decreases, and the smaller the spacing is, the smaller the maximum value is.The effect of reinforcement spacing on the stability of expansive soil slope is greater, the smaller the spacing, the better the stability, and the slope slope safety factor, scour resistance and slope body integrity can be improved indirectly by backpack grille.
【作者单位】：长沙理工大学交通运输工程学院;
【基金】：国家自然科学基金项目(50978035;51478054) 湖南省教育厅科研项目(15C0043) 广西交通科技项目(2011-20)
【分类号】：U213.13;U416.14

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