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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。
Taking into account the long-term atmospheric weathering such as rainfall and evaporation, the shear strength of the expansive soil is attenuated. The shear strength parameters of the expansive soil are determined by combining with the measured indoor nonlinear extensional soil strength. Through numerical simulation, the interfacial strength parameters, Influence of Factors such as Opposite Slope or Not on Reinforced Expansive Soil Cutting Slope. The results show that geogrid can effectively restrain horizontal displacement of slope and reduce the hygroscopic expansion and softening effect of soil so that the potential sliding surface may transfer deep into the slope. The effect of interface strength parameters on the maximum axial force Is small, but the safety factor will increase with its increasing; under the condition of different reinforcement spacing, the maximum axial force of each layer of grille changes along the height basically the same, first increases and then decreases, and the smaller the spacing, the The maximum value is smaller; the spacing of reinforcement has a greater influence on the stability of expansive soil slope, the smaller the spacing, the better the stability; the anti-wrapping grid can indirectly improve the safety factor of slope and its erosion resistance and slope Body integrity.