Calculation and analysis of seismic ground motion parameters for different engineering geological divisions of Chengdu basin
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摘要: 场地条件对地震动幅值和频谱特性均有影响， 现行的中国地震动参数区划图根据场地类别调整地震动反应谱特征周期， 但尚未考虑到对地震动峰值和反应谱平台值的调整. 以成都盆地为例， 广泛收集了盆地范围内的工程钻孔资料. 考虑到不同工程地质分区内场地地震动参数可能存在较大差异， 在研究区工程地质分区的基础上， 利用等效线性化方法对钻孔进行了土层地震反应分析， 给出了成都盆地内不同工程地质分区的地震动参数调整系数建议值.Abstract: Site condition can affect amplitude and spectrum characteristics of seismic ground motion. Adjustment scheme for ground motion characteristic period of response spectrum in Current Seismic Ground Motion Parameter Zonation Map of China was given but peak ground motion and platform value of response spectrum were not taken into account. Illustrated by the example of Chengdu basin, engineering borehole data in the basin region were extensively collected. In consideration of the large difference between different engineering geological divisions, the equal linear method was used to conduct seismic response analysis of soil layers for different boreholes based on engineering geological division. As a result, suggested earthquake ground motion adjustment factors for different engineering geological divisions were given.
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图 1 成都盆地工程地质分区图 Ⅰ. 基岩区； Ⅱ. 浅丘台地； Ⅲ. 冲积平原
Figure 1. Engineering geological divisions of Chengdu basin Ⅰ. Bedrock area； Ⅱ. Shallow hill terrace； Ⅲ. Alluvial plain
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图 2 统计钻孔的覆盖层厚与等效剪切波速分布图
Figure 2. Overburden thickness and equivalent shear wave velocity for statistical boreholes
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图 4 工程地质分区Ⅲ区内Ⅱ类场地地表反应谱
Figure 4. Response spectrum of soil surface of category Ⅱ site in engineering geological division Ⅲ
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图 5 Ⅱ区(a)和Ⅲ区(b)Ka系数拟合直线
Figure 5. Fitted line of Ka in engineering geological divisions Ⅱ (a) and Ⅲ(b)
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图 6 Ⅱ区(a)和Ⅲ区(b)内Ⅱ类场地Kαmax系数拟合图
Figure 6. Fitted line of Kαmax for site category Ⅱ in engineering geological divisions Ⅱ (a) and Ⅲ(b)
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图 7 Ⅱ区(a)和Ⅲ区(b)内Ⅱ类场地ΔTg系数拟合图
Figure 7. Fitted line of ΔTg for site category Ⅱ in engineering geological divisions Ⅱ (a) and Ⅲ(b)
表 1 各土层的动剪切模量比及阻尼比与剪应变的关系
Table 1 Relationship of the dynamic shear modulus ratio and damping ratio With the shear strain for different soil layers
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表 2 不同分区Ka系数的统计结果
Table 2 Ka statistical results for different engineering geological divisions
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表 3 不同分区Kαmax系数统计结果
Table 3 Kαmax statistical results for different engineering geological divisions
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表 4 不同分区ΔTg系数统计结果
Table 4 ΔTg statistical results for different engineering geological divisions
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表 5 各区地震动参数调整系数建议值
Table 5 Suggested ground motion adjustment factors for different engineering geological divisions
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