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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第45卷

期数:

2023年第01期

页码:

118-130

栏目:

工程地质与环境灾害

出版日期:

2023-01-15

文章信息/Info

Title:

Landquakes Generated by Debris Falls with Different Particle Sizes

文章编号:

1672-6561(2023)01-0118-13

作者:

罗 肖¹; 程谦恭¹; 2*; 王玉峰¹; 2; 李天话¹

(1. 西南交通大学 地质工程系,四川 成都 611756; 2. 西南交通大学 高速铁路运营安全空间信息技术国家地方联合工程实验室,四川 成都 611756)

Author(s):

LUO Xiao¹;  CHENG Qian-gong¹; 2*;  WANG Yu-feng¹; 2;  LI Tian-hua¹

(1. Department of Geological Engineering, Southwest Jiaotong University, Chengdu 611756, Sichuan, China; 2. State-province Joint Engineering Laboratory of Spatial Information Technology for High-speed Railway Safety, Southwest Jiaotong University, Chengdu 611756, Sichuan, China)

关键词:

地质灾害;  岩崩-碎屑流;  颗粒流;  物理模型实验;  滑震;  环境地震学;  地震动信号;  参数反演

Keywords:

geological hazard;  debris fall;  granular flow;  physical model experiment;  landquake;  environmental seismology;  seismic signal;  parameter inversion

分类号:

P694; P642.21

DOI:

10.19814/j.jese.2022.10002

文献标志码:

A

摘要:

岩崩-碎屑流是一种发生在高山峡谷地区,具有高位性、隐蔽性、事件突发性和灾害巨大危害性等特征的地质灾害,滑震信号监测可实现对地质灾害体运动信息的实时捕获,为灾害预警及灾后评估提供重要信息。以颗粒集合体崩落运动过程为研究对象,设计并开展了物理模型实验,分析了颗粒粒径对滑震信号特征的影响,探讨了岩崩-碎屑流撞击过程产生的滑震信号特征及其现实意义。结果表明:①颗粒集合体总质量一定时,滑震信号最大振幅值为17.33g～39.21g,且随着颗粒粒径的增大而增大; ②颗粒集合体总质量一定时,滑震信号包络线平均值、阿里亚斯强度随着颗粒粒径的增大而增大; ③粒径为2～4 mm的颗粒集合体产生的滑震信号平均频率为16.95～23.02 kHz,且在总质量一定时,滑震信号的平均频率随着颗粒粒径的增大而减小。本文研究成果以期进一步加深对滑震信号影响因素的认识,并为灾害潜在区域监测预警系统建立、重大地质灾害灾后快速评估、应急响应措施制定等提供理论依据。

Abstract:

Debris fall, which is a kind of geological disaster with high position and concealment characteristics, often develops in mountainous areas and occurs suddenly. It poses a great threat to the safety of downstream constructions and persons. Compared with traditional monitoring methods, the seismic signals generated by geophysical flows have certain advantages, which can provide continuous real-time monitoring of geological disasters that occurred hundreds of kilometers away and even far, and provide important information for disaster early warning and post-disaster assessment. Taking the fall processes of granular flows as research objects, a series of physical model experiments of granular flows was designed and conducted here with the kinematic process and seismic signals of granular flows being recorded; the characteristics of the seismic signals under the influence of particle size were detailed analyzed. The results show that ① at a constant granular flow volume, the maximum amplitude of the seismic signal is between 17.33g and 39.21g, which increases with the increase of particle size; ② at a constant granular flow volume, the average value of seismic envelope and Arias intensity increase with the increase of particle size; ③ the frequency of seismic signal obtained on laboratory scale experiment with particle diameter from 2 to 4 mm is between 16.95 and 23.02 kHz; at a constant granular flow volume, the average frequency decreases with the increase of particle size. The above results can provide a theoretical basis for a deeper understanding of the influencing factors on landquakes, establishment of disaster potential regional monitoring and early warning system, rapid post-disaster assessment of major geological disasters, and development of emergency response measures.

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备注/Memo

备注/Memo:

收稿日期:2022-10-03; 修回日期:2022-12-03投稿网址:http:∥jese.chd.edu.cn/
基金项目:国家自然科学基金项目(42177131,41877226,41877237)
作者简介:罗 肖(1996-),男,四川蒲江人,工学硕士研究生,E-mail:luoxiao@my.swjtu.edu.cn。
*通讯作者:程谦恭(1962-),男,甘肃静宁人,教授,博士研究生导师,理学博士,E-mail:chengqiangong@swjtu.edu.cn。

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