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二元结构顺层边坡抗滑桩抗震性能研究

DOI: 10.13197/j.eeev.2014.06.248.liangqg.031, PP. 248-255

Keywords: 抗滑桩,二元结构顺层边坡,模型试验,数值模拟,界面

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Abstract:

采用振动台物理模拟试验方法,输入振幅逐渐增大的水平向正弦波加速度,对比分析了抗滑桩加固前后二元顺层边坡的动力响应特征,采用MIDAS/GTS软件对模型试验得出的结果进行数值分析,结果表明(1)二元结构顺层边坡,破坏时与均质边坡的相似之处为受高程放大效应和垂直放大效应影响,破坏的初始首先在边坡的中上部产生拉裂缝,放大系数最大值出现的位置往往就是边坡初始破坏的位置.与均质边坡不同的是最初产生的拉裂缝不一定会发展成为控制裂缝,拉裂缝产生之后并不会在土体内部产生控制性剪切裂缝,进而产生滑裂面,而是会沿二元结构面产生滑动破坏.(2)抗滑桩在水平地震动作用下倾倒破坏的轴心并不一定是在抗滑桩外侧与土体交界面处,本例中位于滑面下1m处.(3)锚杆与抗滑桩联合支护时锚杆可有效减小抗滑桩的弯矩,提高抗滑桩在静力和动力荷载下抵抗破坏的能力.研究结果对二元顺层边坡的抗震设计与分析有一定参考价值.

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