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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Methodology for site-response studies using multi-channel analysis of surface wave technique in Dehradun city
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Methodology for site-response studies using multi-channel analysis of surface wave technique in Dehradun city

机译：德拉敦市利用表面波技术多通道分析进行场地响应研究的方法

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Two-dimensional shear wave velocity investigation using the multi-channel analysis of surface waves helps identify lateral and vertical variations of shear wave velocity at shallow depth. This information is required for predicting the ground motion response to earthquakes in areas underlain by thick soil cover. At one such area in Dehradun, at the foothills of the Himalaya, shear wave velocities of the near-surface soil were determined for 50 locations covering almost all representative units with respect to variation in local geology and geomorphology. Based on the average shear wave velocities of the upper 30 m of the soil, sites located in the south-southwestern and central part of the city are predominantly classified as class 'D' (180-360 m/s)except a few locations like Clement Town (site no. 43) and Majra (site no. 48), which can be classified as class 'E' due to very low shear wave velocity, in accordance with the NEHRP 1997 provision. The northern part of Dehradun city shows high velocities, ranging from 300 m/s at the surface to more than 700 m/s at depth of 30 m. These sites located in the northern and eastern parts of the city with average shear wave velocity (VS) values more than 360 m/s have been classified as class 'C' site (360-760 m/s). The characteristic period estimated for each site of the soil column varies from 1.5 to 3.12 Hz. Based on the shear wave velocity, input motion, static and dynamic properties of different soil layers, site-response spectrum and amplification functions have been derived. The response spectrum suggests spectral acceleration value for two-storey structures of 3 to 8 times higher than the peak ground acceleration at the bed rock level, i.e. 0.05 g. The analysis also suggests peak amplification at 3-4, 2-2.5 and 1-1.5 Hz in the northern, central and south-southwestern parts of the city respectively.
机译：使用表面波的多通道分析进行二维剪切波速度调查，有助于确定浅层剪切波速度的横向和垂直变化。需要此信息来预测在厚土覆盖下的地区对地震的地震动响应。在喜马拉雅山山脚下德拉敦的一个这样的地区，确定了近地表土壤的横波速度，涵盖了几乎所有代表单位的50个位置，涉及局部地质和地貌变化。根据土壤上部30 m的平均剪切波速度，位于城市西南，中部和中部的站点主要被归类为“ D”类（180-360 m / s），除了以下几个位置根据NEHRP 1997的规定，由于剪切波速度非常低，可以将Clement Town（站点编号43）和Majra（站点编号48）归为“ E”类。德拉敦市北部显示出很高的速度，从地表的300 m / s到深度为30 m的700 m / s以上。这些位于城市北部和东部且平均剪切波速度（VS）值超过360 m / s的站点已被列为“ C”类站点（360-760 m / s）。估计土壤柱每个位置的特征周期为1.5到3.12 Hz。基于剪切波速度，输入运动，不同土层的静，动力特性，位置响应谱和放大函数。响应光谱表明，两层结构的光谱加速度值比基岩水平处的峰值地面加速度高3至8倍，即0.05克。分析还表明，该城市的北部，中部和西南西南部分别在3-4、2-2.5和1-1.5 Hz处出现峰值放大。

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