| 软弱夹层厚度和倾角对斜坡地震动加速度响应规律的影响 |
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| 引用本文： | 刘汉香,许强,周飞,杨峥,王峰.软弱夹层厚度和倾角对斜坡地震动加速度响应规律的影响[J].煤炭学报,2016,41(Z1):118-124. |
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| 作者姓名： | 刘汉香 许强 周飞 杨峥 王峰 |
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| 作者单位： | 成都理工大学 地质灾害防治与地质环境保护国家重点实验室,四川 成都 610059 |
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| 基金项目： | 国家重点基础研究计划(973)资助项目(2013CB733200);国家杰出青年科学基金资助项目(41225011) |
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| 摘 要： | 地质体中的软弱夹层包含组成材料、厚度、埋深、倾角和延展方向等特征,不同特征的夹层与地震波相互作用,往往使地质体的动力响应结果产生显著差异。以含软弱夹层岩质斜坡为研究对象,开展了针对4个含软弱夹层斜坡模型的振动台试验,考虑的夹层特征包括厚度（3和5 cm）和倾角（0°和20°）。采用比较分析法,揭示了夹层的厚度和倾角特征分别对斜坡水平分量加速度特性的影响,以及各自产生影响的相对强弱。在比较的过程中,既观察到了厚夹层相比于薄夹层,对地震波的隔震作用,也观察到了水平夹层相比于反倾夹层,对地震波的增强作用。但这2种现象并不是出现在沿斜坡表面的整个高程范围内,主要体现在坡体中上段,尤其是在相对高程h/H=0.5和坡顶处。如在坡顶处,当夹层水平布置时,含薄夹层模型的PHA值是含厚夹层模型的1.8~2.6倍,而当夹层均为薄层时,含水平夹层模型的PHA值是含反倾夹层模型的1.8倍。另一个重要现象是,在坡体中上段（0.75≤h/H≤1.0）和坡底,夹层厚度对模型斜坡的PHA值起到了控制作用,使得因厚度差异引起的响应差异最大;而在坡体中下段（0.25
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| 关 键 词： | 斜坡 软弱夹层 振动台试验 厚度 倾角 水平向加速度响应 |
| 收稿时间： | 2015-04-14 |
Influence of a weak interlayer of different thicknesses and dip angles on seismic acceleration responses of a slope |
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| Abstract: | The weak layer in a geologic body is characterized by its material property,thickness,depth,dip angle,extending direction,etc.A weak layer of different characteristics always causes the significant different seismic responses in a geologic body,through the interaction between the weak interlayer and seismic waves.To study the rock slopes with a weak interlayer,four slope models were designed for conducting the shaking table tests.The characteristic parameters of the weak interlayer include the thickness (3 and 5 cm) and dip angle (0° and 20°).Based on the test data,a previous paper made a rather detailed comparative analysis on whether or not a weak interlayer influences the horizontal acceleration responses and the deformation and failure features of model slopes.The present paper aims at uncovering the influence of the thickness and dip angle on the horizontal acceleration responses of model slopes.By means of comparative analysis,two phenomena are observed.One is that the thick interlayer produces wave-isolation effect in the model slope relative to the thin interlayer,and the other one is that the horizontal interlayer produces the stronger response than the anti-dip interlayer.However,it should be noted that the two phenomena doesn’t occur in all elevations along the slope surface,but are observed mainly in the upper part of slope,especially in relative elevation h/H=0.5 and at the crest.For instance,at the crest,the PHA in model with thin interlayer is 1.8-2.6 times larger than that in model with thick interlayer as the two interlayers are horizontally extended,and the PHA in model with horizontal interlayer is 1.8 times larger than that in model with anti-dip interlayer as the two interlayers are thin in thickness.Another important result is the thickness plays the control role in PHA response in relative elevations with 0.75≤h/H≤1.0 and at the slope toe,while the dip angle plays the control role in relative elevations with 0.25<h/H≤0.5.Herein,the control effect indicates the maximum response difference caused by different thicknesses or dip angles. | |
| Keywords: | slope weak interlayer shaking table test thickness dip angle horizontal acceleration response |
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