冰岩碎屑流崩滑地震动信号测试与分析

林子钰; 范刚; 刘大瑞; 吕霞; 周家文

doi:10.11779/CJGE2023S10042

冰岩碎屑流崩滑地震动信号测试与分析 English Version

林子钰^1,,
范刚^{1, 2, ,},
刘大瑞¹,
吕霞¹,
周家文^{1, 2}

1.
四川大学水利水电学院, 四川成都 610065
2.
四川大学水力学与山区河流开发保护国家重点实验室, 四川成都 610065

基金项目:

国家自然科学基金区域创新发展联合基金项目 U20A20111

四川省国际科技创新合作/港澳台科技创新合作项目 2021YFB0178

详细信息

作者简介:
林子钰(2000—)，女，硕士研究生，主要从事滑坡等地质灾害产生的地震动信号方面的研究工作。E-mail: Linziyu@stu.scu.edu.cn

通讯作者:
范刚, E-mail: fangang@scu.edu.cn

中图分类号: TU435
计量
- 文章访问数: 155
- HTML全文浏览量: 28
- PDF下载量: 42
出版历程
- 收稿日期: 2023-07-04
- 网络出版日期: 2023-11-23
- 刊出日期: 2023-10-31

Tests and analysis of ground motion signals of ice-rock avanlanches

LIN Ziyu^1,,
FAN Gang^{1, 2, ,},
LIU Darui¹,
LÜ Xia¹,
ZHOU Jiawen^{1, 2}

1.
College of Water Resource and Hydropower, Sichuan University, Chengdu 610065
2.
State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065

摘要

摘要: 随着西部大开发的战略部署及全球气温的持续升高，冰-岩碎屑流滑坡因其超强的运动性和破坏力而引起了业内学者的广泛关注。通过开展大型斜槽试验来模拟高寒山区特有的冰-岩碎屑流崩滑，利用现场布设的高精度传感器获取冰-岩碎屑流激发出的地震动信号，并基于Hilbert-Huang变换方法对比分析了5种工况下信号的时频特征，探究了含冰率和冰所处位置两个相关变量与冰-岩碎屑流的冲击力间的相关性。根据分析结果：冰-岩碎屑流中含冰率越大、冰与滑脱面的接触面越大，其激发的地震动信号振幅越大、时间越短、峰值更集中；信号频率主要分布在0.06~45 Hz范围内，以低频振动为主，高频信号集中出现在冰-岩碎屑流与缓坡段及河道两岸发生强烈冲击碰撞时期。
- 冰-岩碎屑流 /
- 斜槽试验 /
- HHT法 /
- 地震动信号
Abstract: With the strategic deployment of western development and the continuous rise of global temperature, the ice-rock avalanches have attracted the wide attention of scholars in the industry because of their high mobility and destructive power. The large-scale flume tests are carried out to simulate the ice-rock avalanches. The seismic signals generated by the ice-rock avalanches are obtained by using the high-precision sensors in the field, and the time-frequency characteristics of signals under 5 working conditions are compared and analyzed based on the Hilbert-Huang transform method. The correlation between ice content and ice location and the impact force of ice-rock avalanches are investigated. According to the analysis results, the larger the ice content and the larger the contact surface between the ice and the detachment surface, the larger the amplitude, the shorter the time and the more concentrated the peak value of the induced seismic signals. The frequency of signals is mainly distributed in the range of 0.06~45 Hz. The low-frequency vibration is dominant, while the high-frequency ones are concentrated in the period of strong impact and collision between the ice-rock avalanches and the gentle slope section and the river banks.
- ice-rock avalanches /
- flume test /
- HHT method /
- seismic signal

HTML全文

图 1 试验装置及参数

Figure 1. Flume test devices and parameters

下载: 全尺寸图片幻灯片

图 2 试验用料

Figure 2. Test materials

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图 3 试验过程

Figure 3. Test process

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图 4 5种工况下记录的冰岩崩激发的垂向地震动信号

Figure 4. Vertical ground motion signals induced by ice-rock avalanches recorded under 5 conditions

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图 5 不同工况下冰岩崩激发的垂向地震动信号Hilbert时频谱

Figure 5. Hilbert-spectra of vertical ground motion signals excited by rock-ice avalanches recorded under different working conditions

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图 6 不同工况下的Hilbert边际谱

Figure 6. Hilbert marginal spectra under different working conditions

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表 1 物料组成

Table 1 Material compositions

物质		冰	砾粒			砂粒	黏土	状态
粒径/mm		10~20	10~20	5~10	2~5	1~2	—
百分比/%		/	54	49	32	9	10
质量/kg	1	25	40.35	16.92	11.19	3.00	3.54	混合
	2	50	26.90	11.28	7.46	2.00	2.36	混合
	3	100	0.00	0.00	0.00	0.00	0.00
	4	25	40.35	16.92	11.19	3.00	3.54	冰在上
	5	50	26.90	11.28	7.46	2.00	2.36	冰在上

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