青海玛多<i>M</i>7.4地震中野马滩大桥地震动特征初判

李宗超; 孙吉泽; 高孟潭; 陈学良; 赵延娜; 吴清

doi:10.19975/j.dqyxx.2021-037

青海玛多M7.4地震中野马滩大桥地震动特征初判

doi: 10.19975/j.dqyxx.2021-037

1.
中国地震局地球物理研究所，北京 100081
2.
深圳防灾减灾技术研究院，深圳 518003
3.
中国地震局地球物理勘探中心，郑州 450002

基金项目: 国家重点研发计划资助项目（2019YFC1509403, 2017YFC1500205, 2018YFC1504601, 2018YFC100504）；中国地震局地球物理研究所基本科研业务费专项资助项目（DQJB19A0131, DQJB19A0133, DQJB21Z15）

详细信息

通讯作者:
李宗超（1989-)，男，助理研究员，主要从事强地震动数值模拟、震源参数不确定性研究. E-mail：lizongchaoigo@163.com

中图分类号: P315
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出版历程
- 收稿日期: 2021-07-05
- 录用日期: 2021-07-20
- 网络出版日期: 2021-07-21
- 刊出日期: 2022-01-01

Preliminary judgment of ground motion characteristics of Yematan bridge in Qinghai Maduo M7.4 earthquake

1.
Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
2.
Shenzhen Academy of Disaster Prevention and Reduction, Shenzhen 518003, China
3.
Geophysical Exploration Center, China Earthquake Administration, Zhengzhou 450002, China

Funds: Supported by the National Key Research and Development Program of China (Grant Nos. 2019YFC1509403, 2017YFC1500205, 2018YFC1504601, 2018YFC100504) and the Special Fund of the Institute of Geophysics, China Earthquake Administration (Grant Nos. DQJB19A0131, DQJB19A0133, DQJB21Z15)

摘要

摘要: 2021年5月22日青海省玛多县发生M7.4地震，造成玛多县境内的野马滩大桥和野马滩2号桥发生落梁破坏. 中国地震局公布的地震烈度表明野马滩大桥处的地震烈度为Ⅸ. 然而野马滩大桥附近无强震台站，未能记录到大桥附近的加速度时程，这也阻碍了野马滩大桥在地震作用下破坏机理的研究. 因此，本文尝试采用经验格林函数方法、并参考医学上自身异位皮肤移植的理念，尝试评估野马滩大桥处的地震动的主要特征[包括地震动峰值加速度（PGA）的可能的取值范围和加速度时程]，并与已公布的玛多地震的地震烈度、中国地震烈度表（GB/T17742—2020）、第五代地震动区划图（GB18306—2015）中的设计反应谱进行对比. 结果表明：（1）本文得到的PGA的取值范围（320～620 cm/s²）与中国地震烈度表（GB/T17742—2020）中地震烈度为Ⅸ区内的PGA的取值范围（402～830 cm/s²）匹配程度较好；（2）本文合成的地震动反应谱与第五代地震动区划图中，野马滩大桥处的极罕遇地震动的加速度设计反应谱整体匹配较好，表明本文合成的加速度时程可以造成野马滩大桥落梁破坏. 研究表明本文给出的野马滩大桥附近的地震动强度特征具备一定的参考价值，可作为野马滩大桥处的加速度时程输入，为研究该桥的坍塌机理提供数据支持.
- 地震动评估 /
- 格林函数来源 /
- 等效震级 /
- 地震动范围 /
- 加速度时程
Abstract: On May 22, 2021, an earthquake of M7.4 occurred in Maduo County, Qinghai Province, causing the collapse of the Yematan bridge and the Yematan No.2 bridge in Maduo County. According to the earthquake intensity announced by China Earthquake Administration, the earthquake intensity of the Yematan bridge is IX. However, the lack of strong seismic stations and the unrecorded time history of ground motion near the bridge is also hindering the research work on earthquake-induced failure mechanisms of the Yematan bridge. Therefore, this paper attempts to use the empirical Green's function method and refer to the concept of self-heterotopic skin transplantation in medicine to preliminarily evaluate the main characteristics of the ground motion intensity at the Yematan bridge, and try to give the possible range of peak ground acceleration (PGA) and the ground motion time history. The latest China seismic intensity table (GB/T17742—2020) and the design response spectra of the fifth generation seismic zoning map (GB18306—2015) are compared. The results show that: (1) the range of PGA (320~620 cm/s²) obtained in this paper matches well with the range of PGA (402~830 cm/s²) in China seismic intensity table (GB/T17742—2020); (2) The ground motion response spectrum synthesized matches well with the acceleration design response spectrum of extremely rare ground motions at the Yematan bridge in the fifth generation seismic zoning map (GB18306—2015), which indicates that the acceleration time history synthesized in this paper can cause the beam falling failure of the bridge. Our results show that the characteristics of ground motion intensity near the Yematan bridge are very possible and have a certain reference value. It can be used as the time history input of ground motion for the Yematan bridge and provide data support for the study of the collapse mechanism of bridge.
- ground motion evaluation /
- Green's function source /
- equivalent magnitude /
- ground motion range /
- acceleration time history

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图 1 野马滩大桥的震源相对位置

Figure 1. The location of Yematan bridge and source

下载: 全尺寸图片幻灯片

图 2 本文获得的多种可能的野马滩大桥处的地震动加速度时程

Figure 2. Several possible ground motion acceleration time histories at Yematan bridge obtained in this paper

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图 3 各等效格林函数获得的野马滩大桥处的多条地震动加速度反应谱

Figure 3. Multiple acceleration response spectra of Yematan bridge obtained from each equivalent magnitude

下载: 全尺寸图片幻灯片

图 4 合成的野马滩大桥的多条地震动反应谱与罕遇、极罕遇地震动设计反应谱的对比

Figure 4. Comparison of multiple ground motion response spectra of Yematan bridge synthesized with design response spectra of rare and extremely rare ground motions

下载: 全尺寸图片幻灯片

表 1 玛多地震基本震源参数

Table 1. The source parameters of Maduo earthquake

名称	参数	参考来源
震级	M7.4
震中	98.38°E, 34.65°N	王未来等（2021）
震源深度	7.6 km
断层面积	170 km×20 km
地震矩	1.9E+20N·m	王为民等（2021）
震源机制（走向/倾角/滑动角）	节面1: （101.72°,81.65°,-4.20°）
震源机制（走向/倾角/滑动角）	节面2: （192.33°,85.84°,-171.62°）
剪切波速V_S	3.4 km/s	李永华等（2021）
破裂速度V_r	2.45 km/s	Geller （1976）

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表 2 等效震级的基本参数

Table 2. The basic parameters of equivalent magnitude

等效震级	应力降比值C	划分子断层个数N	地震矩/ (dyne.cm)	破裂面积/ m²
M5.3	5.21	3.74	2.45E+24	5.35E+08
M5.4	4.98	3.39	3.13E+24	6.10E+08
M5.5	4.76	3.07	3.99E+24	6.96E+08
M5.6	4.54	2.78	5.09E+24	7.95E+08
M5.7	4.34	2.52	6.49E+24	9.07E+08
注：具体计算时，N值取大于N值最近的整数.

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