【摘要】 设计循环荷载下土钉支护边坡室内试验模型,利用多通道协调加载系统,采用正弦波形式的循环荷载进行坡顶加载,频率为2Hz,研究4种载荷参数即10～30,30～50,40～60,40～80kN时循环荷载作用下土钉轴力、面板位移和坡顶沉降的累积效应和面板的动力响应,并研究载荷参数为10～30kN时土钉支护的侧边界效应。研究表明:在考虑侧边界效应时,土钉轴力和面板位移较小;当忽略侧边界效应时,且载荷参数保持不变时,随着加载次数增加,面板加速度、土钉轴力和面板位移有一定增加,坡顶沉降较显著;加载次数相同而载荷平均值增加时,面板加速度变化很小,土钉轴力、面板位移和坡顶沉降出现明显的增长;坡面中部位移似抛物线形状。更多还原

【Abstract】 A laboratory model for studying dynamic behaviour of soil nailed slope under cyclic load is designed. The sinusoidal cyclic load is produced by a multi-channel load system with four kinds of load magnitude,which are 10–30,30–50,40–60,40–80 kN,and the frequency is 2 Hz.Considering boundary condition influence and accumulative effect of cyclic numbers,axial force of soil nails,displacement and acceleration of the panel, and settlement of top surface,are studied in detail.When the load is 10–30 kN,test results with fixed bilateral boundaries are compared with free ones.Axial force of soil nails and displacement of the panel in the former case are less than that in the latter one under the same cyclic numbers.Then comparative experiments with 4 kinds of load magnitudes with free lateral boundaries are studied.With a certain load magnitude,with increase of cyclic numbers,acceleration and displacement of the panel increases slowly,whereas settlement of top surface increases distinguishedly.With the same cyclic numbers,with increase of average load magnitude,acceleration of panel doesn′t vary obviously,nevertheless axial force of soil nails,displacement of the panel and settlement of top surface increase significantly,and displacement along slope height is parabolic curve like.更多还原