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堆积层斜坡地震动地形效应试验研究
Experimental research of the topographic effects of slopes in earthquake

查看参考文献38篇

黄栋 1   乔建平 1   张小刚 1   陈宇龙 2  
文摘 地震中已经观测到斜坡的地震响应会受地形的影响。因此,在划分堆积层斜坡坡面类型的基础上,开展不同坡形振动台模型试验。试验结果表明:输入强度较强的地震波时,斜坡表面加速度响应峰值放大系数大于斜坡内部,且斜坡中上部及表面曲率变化较大处(AC2)加速度放大效应更为显著。坡形的变化影响着斜坡自振频率,表现为上凸下凹型斜坡的自振频率接近于5 Hz,其他坡形斜坡接近于10 Hz。模型破坏的临界加速度阈值为500~ 700 Gal与斜坡稳定性计算结果基本一致。坡形影响斜坡的滑动面位置及厚度,曲率半径越大(凸型为正、凹型为负)的坡形滑动面厚度越大。滑动距离(与坡脚的距离)量测显示:直线型和上凹下凸型斜坡滑动距离最远危害范围大,凸型和上凸下凹型斜坡运动距离较远危害范围较大,凹型坡运动距离较近危害范围较小。因此,直线型和上凹下凸型斜坡的危险性(危害性)最高,凸型和上凸下凹型斜坡危险性较高,凹坡危险性最低。本研究的意义在于加强地震力作用下地形效应对斜坡稳定性研究的认识,为防灾减灾和灾害风险评价提供科学依据。
其他语种文摘 It has been observed that during an earthquake,the seismic response of slopes could be affected by the topography. Therefore,a general earthquake-induced slope model is defined and designed with five different slope shapes based on the statistical relations between the earthquake-induced landslides and the slope shapes. According to the test results,the amplification factor of the peak ground acceleration(PGA) on the surface of the slope was higher than that in the slope when the intensity of the input motion was relatively high. The site at the upper of the slope with the largest curvature on the middle of the slope surface(AC2) had the most notable amplification effect. The shape of the slope affected the natural frequency of the ground for the slope. The upper convex and lower concave slope had a natural frequency close to 5 Hz while the slopes of other shapes had a natural frequency close to 10 Hz. The critical acceleration values at failure ranged from 500 to 700 Gal,which were consistent with the calculated values for the slope from material strength tests. The shape of the slope affects the location and depth of its failure surface. The slope with large curvature radius(positive for convex and negative for concave) usually has a deeper sliding failure surface. The concave slopes have a shorter sliding distance and a smaller hazardous range. The convex and the upper convex and lower concave slopes have a longer sliding distance and a larger hazardous range. The linear and the upper concave and lower convex slopes have the longest sliding distance and the largest hazardous range. Therefore,the slopes with the linear or the upper concave and lower convex configurations have the highest risks,followed by the convex and the upper convex and lower concave slopes,while the concave slopes have a relatively strong ability to resist the ground motions and pose the lowest danger.
来源 岩石力学与工程学报 ,2017,36(3):587-598 【核心库】
DOI 10.13722/j.cnki.jrme.2016.0952
关键词 边坡工程 ; 地形效应 ; 振动台模型试验 ; 动力响应 ; 加速度响应峰值
地址

1. 中国科学院水利部成都山地灾害与环境研究所, 中国科学院山地灾害与地表过程重点实验室, 四川, 成都, 610041  

2. 东京大学土木工程系, 日本, 东京, 113-8656

语种 中文
文献类型 研究性论文
ISSN 1000-6915
学科 地质学
基金 国家自然科学基金资助项目 ;  中国科学院STS项目
文献收藏号 CSCD:5933458

参考文献 共 38 共2页

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引证文献 6

1 季翔 基于DEM的坡形与水土流失的关系—以西溪小流域为研究区 中国农业大学学报,2019,24(2):161-171
被引 2

2 金刚 宜宾长宁M_S6.0级地震斜坡动力响应特征 山地学报,2019,37(6):943-954
被引 2

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