SH波斜入射下水平成层场地地震动特性研究

陈三红; 张郁山; 郝明辉

doi:10.11899/zzfy20240109

SH波斜入射下水平成层场地地震动特性研究

doi: 10.11899/zzfy20240109

陈三红^{1, 2,},
张郁山²,
郝明辉²

1.
中国地震局地球物理研究所, 北京 100081
2.
中国地震灾害防御中心, 北京 100029

基金项目: 地震科技星火计划（ XH21049Y）；国家重点研发计划重点专项（2018YFC1504600）

详细信息

作者简介:
陈三红，女，生于1994年。硕士研究生，工程师。主要从事复杂场地效应等方面的研究。E-mail：1561980175@qq.com

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出版历程
- 收稿日期: 2022-12-02
- 刊出日期: 2024-03-31

Ground Motion Characteristics of Horizontal Layered Site Based on SH Wave Oblique Incidence

1.
Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
2.
China Earthquake Disaster Prevention Center, Beijing 100029, China

摘要

摘要: 基于位移场理论和传递矩阵法，建立SH波斜入射下水平成层场地非线性地震反应等效线性化求解方法，研究SH波不同角度入射下场地地表峰值加速度放大系数及反应谱谱比变化规律。研究结果表明，地震波入射角度对场地地表峰值加速度影响明显，在大多数情况下，地震波斜入射下地表峰值加速度大于垂直入射；地震波斜入射下反应谱特性变化明显，入射角度对高频段反应谱的放大效应显著，且入射角度对不同类型场地的影响周期范围不同，入射角度对Ⅲ类场地周期影响范围明显宽于Ⅱ类场地。
- SH波 /
- 斜入射 /
- 反应谱谱比 /
- 放大效应
Abstract: Based on the displacement field theory and transfer matrix method, this paper deduces the equivalent linearization method of layered site under oblique incidence of SH waves, and studies the variation law of peak acceleration magnification and response spectrum ratio of horizontal layered site under different angles of SH waves. The results show that the incident angle of seismic waves has obvious influence on the peak acceleration of the ground surface of layered sites. In many cases, the peak acceleration of the ground surface under oblique incidence of seismic waves is greater than that under vertical incidence. The response spectrum characteristics change obviously under oblique incidence of seismic waves, and the amplification effect of incident angle on high frequency response spectrum values is very significant. On the spectrum shape surface, the influence range of the period of different site types is different, and the influence range of incident angle on the period of type III site is obviously wider than that of type II site.
- SH wave /
- Oblique incidence /
- The spectral ratio /
- Amplification effect

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图 1 SH波不同角度入射下自由表面加速度峰值变化比较

Figure 1. Compare of the peak acceleration excited by SH wave with different angles

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图 2 天然地震波加速度时程曲线

Figure 2. Acceleration time-history curves of input ground motions

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图 3 天然地震波加速度反应谱曲线

Figure 3. Acceleration Spectrum curves of input ground motions

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图 4 场地土剪切模量比和阻尼比随剪应变变化曲线

Figure 4. The curve shows change of shear modulus ratio and damping ratio change with shear strain

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图 5 地震波入射角度对峰值加速度放大系数的影响

Figure 5. Influence of incident angle on PGA amplification coefficient

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图 6 所有地震波以60°入射下的反应谱谱比曲线

Figure 6. Spectral ratio curves under the inputs of natural ground motions at 60°incidence

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图 7 不同强度地震波斜入射下反应谱放大系数

Figure 7. Magnification of response spectrum under oblique incidence with different intensities of seismic waves

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表 1 天然地震波基本信息

Table 1. Basic information of natural ground motions

编号	地震名称	震级/级	台站名称	震中距/km	记录分量
1	1979年美国Imperial Valley-06地震	6.5	Parachute Test Site	12.69	225
2	1999年台湾集集地震	7.6	TCU046	16.74	EW
3	1978年伊朗Tabas地震	7.3	Tabas	2.05	L1
4	1999年台湾集集地震	7.6	TCU075	0.89	EW
5	2004年日本新泻地震	6.6	TYMH05	175.52	NS
6	1999年美国Hector Mine地震	7.1	Amboy	43.05	090
7	1999年台湾集集地震	7.6	TCU101	2.11	EW
8	2010年墨西El Mayor-Cucapah地震	7.2	El Centro Array #12	11.26	000

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表 2 千叶场地计算模型参数

Table 2. Model parameters of the Chiba-ken site

土层编号	土类名称	剪切波速/ （m·s⁻¹）	密度/（g·cm⁻³）	层厚/m
1	亚黏土	140	1.75	5
2	砂质黏土	320	1.80	5
3	细砂	320	2.00	14
4	细砂	420	2.10	16
5	基岩输入	540	2.20	—

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表 3 地铁17号线某站场计算模型参数

Table 3. Model parameters of the Line 17 Subway site

土层编号	土类名称	剪切波速/ （m·s⁻¹）	密度/（g·cm⁻³）	层厚/m
1	粉质黏土	192	1.90	10
2	细砂	236	1.95	25
3	粉质黏土	331	2.00	10
4	细砂	355	2.00	26
5	粉质黏土	362	2.05	12
6	粉质黏土	416	2.10	17
7	粉质黏土	467	2.15	28
8	基岩输入	505	2.20	—

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