强震作用下边坡屈服加速度计算方法的改进

doi:10.13722/j.cnki.jrme.2017.1495

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摘要 Newmark法是一种广泛运用于工程中的地震边坡永久位移计算方法，目前最常使用的传统方法只适用于滑动角度与坡角相近的浅层直线滑面情况。为了将Newmark法推广到圆弧滑面以及结构面控制的直线滑面，在传统方法的基础上改进了地震屈服系数的计算公式，并分析不同滑面形态下边坡的强震永久位移，并与Newmark条分法以及有限元解耦法进行对比。然后分析坡高、坡角、滑面形态性质对地震屈服系数大小的影响。最后与大型振动台试验进行对比。结果表明：(1) 当滑面范围较大时，传统Newmark方法低估了圆弧滑面以及结构面控制滑面在强震作用下的永久位移；(2) 边坡屈服加速度稳定性系数与滑面剪入、剪出口位置以及坡角有关，并且采用改进Newmark方法计算结果与Newmark条分法以及有限元解耦法结果较为一致；(3) 与振动台试验进行对比，改进Newmark方法得出的不同震级条件下的位移变化规律较为一致。证明该方法既继承了传统方法简洁、方便的特点，同时精确度以及适用性均较好，可以直接运用于工程实际中。

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	秦雨樵1
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	但路昭3

关键词 ：边坡工程, 地震边坡, 永久位移, Newmark法, 振动台试验

Abstract：Newmark rigid-block analysis is a permanent displacement calculation method which has been widely used in practice. However，the traditional method can only apply to the shallow linear slip surfaces which slip directions are close to the slope angle. In order to extend this method to circle slip surface and deep linear slip surface，the functions to calculate the seismic yield coefficient are improved based on the traditional methods. Then the permanent displacements of different slip surfaces are analyzed and compared with other Newmark methods including slices method and finite element decoupled method and the influences of slope height，angle and the form of slip surface on seismic yield coefficient are studied. Finally the proposed method is compared with large shaking table test. The results show that，when the slip surface is large，the traditional Newmark method is underestimated the permanent displacement of circle and deep linear slip surface. The improved Newmark method shows the great agreement with slicing methods and finite element decoupled method. The yield acceleration is related with stability coefficient，the range of slip surface and slope angle. The relationship between different levels of earthquake intensities and permanent displacement shows a good agreement with large shaking table test，which confirms that the modified Newmark method inherits the traditional method′s advantages and has better precision and wider application.

Key words： slope engineering seismic slope permanent displacement Newmark method shaking table test

引用本文:

秦雨樵1，2，汤华1，邓琴1，尹小涛1，但路昭3. 强震作用下边坡屈服加速度计算方法的改进[J]. 岩石力学与工程学报, 2019, 38(S2): 3439-3447.
QIN Yuqiao1，2，TANG Hua1，DENG Qin1，YIN Xiaotao1，DAN Luzhao3. Improvement on the calculation method of slope critical acceleration under strong earthquake. , 2019, 38(S2): 3439-3447.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2017.1495 或 http://rockmech.whrsm.ac.cn/CN/Y2019/V38/IS2/3439

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