|Table of Contents|

Landquakes Generated by Debris Falls with Different Particle Sizes(PDF)

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

Issue:
2023年第01期
Page:
118-130
Research Field:
工程地质与环境灾害
Publishing date:

Info

Title:
Landquakes Generated by Debris Falls with Different Particle Sizes
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)
Keywords:
geological hazard;  debris fall;  granular flow;  physical model experiment;  landquake;  environmental seismology;  seismic signal;  parameter inversion
PACS:
P694; P642.21
DOI:
10.19814/j.jese.2022.10002
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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Last Update: 2023-01-30