西安典型地裂缝场地地脉动测试及地震响应特征分析

王晗; 邓亚虹; 慕焕东; 薛捷

doi:10.16031/j.cnki.issn.1003-8035.202202053

西安典型地裂缝场地地脉动测试及地震响应特征分析

1.
陕西铁路工程职业技术学院, 陕西渭南　714000

2.
长安大学地质工程与测绘学院,陕西西安　710054

3.
西安理工大学岩土工程研究所, 陕西西安　710048

4.
河南水利与环境职业学院, 河南郑州　450000

基金项目: 陕西铁路工程职业技术学院2017年科研基金项目（Ky2017-059）；国家自然科学基金面上项目（41772275）；陕西省教育厅科学研究计划专项项目(20JK0801)；陕西省自然科学基础研究计划一般项目（2022JQ-289）；陕西省重点研发计划项目（2022SF-197）

详细信息

作者简介: 王　晗（1989-），男，陕西临潼人，硕士，讲师，主要研究方向为地裂缝动力响应监测与数值模拟。E-mail：wanghchn@126.com

通讯作者: 邓亚虹（1978-），男，湖南安化人，博士，教授，主要研究方向为土动力学与地质灾害减灾防灾研究。E-mail：dgdyh@chd.edu.cn

中图分类号: P694；TU435

收稿日期: 2022-02-25

修回日期: 2022-05-10

录用日期: 2022-06-29

刊出日期: 2022-08-25

Ground pulsation tests and analysis on seismic response of typical ground fissure sites in Xi’an

1.
Shaanxi Railway Institute, Weinan, Shaanxi　714000, China

2.
College of Geological Engineering and Mapping, Chang’an University, Xi’an, Shaanxi　710054, China

3.
Institute of Geotechnical Engineering, Xi’an University of Technology, Xi’an, Shaanxi　710048, China

4.
Henan Vocational College of Water Conservancy and Environment, Zhengzhou, Henan　450000, China

More Information

Corresponding author: DENG Yahong, dgdyh@chd.edu.cn

Received Date: 25 February 2022

Revised Date: 10 May 2022

Accepted Date: 29 June 2022

Publish Date: 25 August 2022

摘要

摘要:
西安地裂缝广泛发育，严重的制约了城市的建设和规划。地裂缝的存在使得建筑场地在地震作用下表现出不同的地震响应特征，因此，研究西安地裂缝场地地震响应特征对地裂缝场地的建筑抗震设防具有重要意义。以西安地区典型地裂缝为研究对象，通过野外调查获得了西安地裂缝场地特征；在此基础上选取典型地裂缝场地，通过地脉动现场测试方法，获取了地裂缝场地卓越频率这一反映地层动力特性的重要参数，通过不同测点傅里叶谱分析得出了场地动力响应规律抗震设防距离。研究表明：西安地裂缝场地的卓越频率在2.79～3.16 Hz，平均卓越频率为2.96 Hz；地裂缝处场地地震响应明显，随着距地裂缝距离的增加场地地震响应逐渐减小，影响范围为15 m左右；地裂缝场地地震响应放大倍数上盘大于下盘，表现出“上盘效应”，放大倍数在1.64～2.38。研究结果对西安地裂缝场地工程抗震设防具有重要意义。
- 黄土 /
- 地裂缝场地 /
- 地脉动 /
- 地震响应 /
- 频谱分析
Abstract:
The extensive development of ground fissures in Xi’an severely restricts the construction and planning of the city. The existence of ground fissures makes the building sites show different seismic response characteristics under earthquakes. Therefore, it is of great significance to study the seismic response characteristics of ground fissure sites in Xi’an for the seismic fortification of ground fissure sites. Taking typical ground fissures in Xi’an as the research object, the characteristics of ground fissures in Xi’an were obtained on the basis of field investigation; the predominant frequency of the ground fissure sites, which is an important parameter reflecting the dynamic characteristics of the formation, is obtained. The seismic fortification distance of the dynamic response law of the site is obtained through the Fourier spectrum analysis of different measuring points. The research shows that the predominant frequency of the ground fissure site in Xi’an is in the range of 2.79−3.16 Hz, and the average predominant frequency is 2.96 Hz; the influence range is about 15 m; the seismic response magnification of the hanging wall is greater than that of the footwall, showing the "hanging wall effect", and the magnification is between 1.64 and 2.38. The research results are of great significance to the seismic fortification of Xi'an ground fissure site engineering.
- loess /
- ground fissure site /
- ground pulsation /
- seismic response /
- spectrum analysis

HTML全文

图 1 西安地裂缝平面分布图

Figure 1.

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图 2 F₁和F₂地裂缝地层剖面

Figure 2.

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图 3 测线位置示意图

Figure 3.

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图 4 CV-374AV伺服型速度网络地震仪

Figure 4.

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图 5 测点布设详图

Figure 5.

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图 6 F₁-1测线傅里叶频谱

Figure 6.

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图 7 上下盘频谱峰值曲线

Figure 7.

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图 8 F₂-1测线傅里叶频谱

Figure 8.

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表 1 地脉动测试统计表

Table 1. Statistical table of micro-tremor test

测线编号	工程地质分区	测线地点	走向
F₁-1	II₂-1	新房村	WE
F₁-1	II₂-1	新房村	WE	F₂-1	II2-1	老人仓村	NE80°

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表 2 F₁-1测线上盘卓越频率及峰值统计表

Table 2. Superior frequency and peak statistical table of F₁-1 hanging wall

测点编号	卓越频率/Hz				合成振幅	距离/m
测点编号						距离/m
HW1	2.98	3.17	2.98	3.04	0.0820	1.5
HW2	2.44	2.34	2.49	2.42	0.0615	3
HW3	2.98	2.78	2.69	2.82	0.0508	6
HW4	3.13	2.73	3.08	2.98	0.0407	9
HW5	3.13	2.69	3.13	2.98	0.0408	12
HW6	2.69	2.49	2.69	2.62	0.0362	15
HW7	2.54	2.44	2.73	2.57	0.0341	20
HW8	2.78	2.88	3.32	2.99	0.0345	25
HW9	3.13	2.44	2.39	2.65	0.0333	30
	平均卓越频率		2.70		放大因子	2.38
注：，，下文同。

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表 3 F₁-1测线下盘卓越频率及峰值统计表

Table 3. Superior frequency and peak statistical table of F₁-1 footwall

测点编号	卓越频率/Hz				合成振幅	距离/m
测点编号						距离/m
FW1	2.64	2.69	2.64	2.66	0.0766	1.5
FW2	2.39	2.25	2.25	2.30	0.0592	3
FW3	2.98	2.98	3.02	2.99	0.0525	6
FW4	3.61	2.98	2.93	3.17	0.0468	9
FW5	3.08	2.88	2.65	2.87	0.0447	12
FW6	2.78	2.93	3.08	2.93	0.0417	15
FW7	2.88	2.78	2.98	2.88	0.0447	20
FW8	3.17	2.78	3.08	3.01	0.0419	25
FW9	2.64	3.76	2.88	3.09	0.0427	30
	平均卓越频率		2.88		放大因子	1.79

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表 4 F₂-1测线上盘卓越频率及峰值统计表

Table 4. Superior frequency and peak statistical table of F₂-1 hanging wall

测点编号	卓越频率/Hz				合成振幅	距离/m
测点编号						距离/m
HW1	3.81	2.78	2.64	3.08	0.0829	1.5
HW2	3.08	2.59	2.69	2.79	0.0591	3
HW3	2.93	3.13	2.83	2.96	0.0546	6
HW4	2.73	2.78	2.64	2.72	0.0466	9
HW5	3.42	2.44	2.49	2.78	0.0427	12
HW6	2.93	2.93	2.49	2.78	0.0438	15
HW7	2.93	3.13	2.83	2.96	0.0445	20
HW8	2.83	3.81	3.96	3.53	0.0456	25
HW9	2.78	3.13	2.54	2.82	0.0431	30
	平均卓越频率		2.94		放大因子	1.87

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表 5 F₂-1测线下盘卓越频率及峰值统计表

Table 5. Superior frequency and peak statistical table of F₂-1 footwall

测点编号	卓越频率/Hz				合成振幅	距离/m
测点编号						距离/m
FW1	3.03	3.86	3.71	3.53	0.0793	1.5
FW2	3.86	3.86	2.73	3.48	0.0646	3
FW3	2.93	2.73	3.42	3.03	0.0581	6
FW4	3.22	2.88	2.73	2.94	0.0468	9
FW5	2.39	3.86	2.54	2.93	0.0459	12
FW6	3.66	2.83	2.64	3.04	0.0501	15
FW7	3.66	4.00	2.49	3.38	0.0502	20
FW8	3.37	2.88	2.78	3.01	0.0476	25
FW9	2.64	3.96	2.59	3.06	0.0458	30
	平均卓越频率		3.16		放大因子	1.64

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表 6 F₁-1和F₂-1测线地脉动响应特征

Table 6. Response to micro-tremor of F₁-1 and F₂-1

测线	位置	平均卓越频率/Hz	平稳段峰值	放大因子	影响范围/m
F₁-1	上盘	2.79	0.0345	2.38	15
F₁-1	下盘	2.88	0.0423	1.79	15
F₂-1	上盘	2.94	0.0443	1.87	15
F₂-1	下盘	3.16	0.0484	1.64	15

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