工程地质学报2024，Vol.32Issue(3)：1020-1034,15.DOI:10.13544/j.cnki.jeg.2023-0216
同震岩体损伤特征的定量分析——以2022年泸定Ms6.8地震为例
QUANTITATIVE ANALYSIS OF DAMAGE CHARACTERISTICS OF CO-SEISMIC ROCK MASS:A CASE OF 2022 Ms6.8 LUDING EARTHQUAKE
摘要
Abstract
Strong earthquakes can cause fractures and damage to rock masses,leading to the occurrence of geological hazards.Earthquakes,being unpredictable,coupled with the inherent discontinuity and complexity of rock masses,result in insufficient quantitative studies on coseismic rock mass damage.Particularly,there is a lack of comparison of actual damage characteristics before and after earthquakes.Therefore,this article takes the Luding Ms6.8 earthquake in 2022 as an example and conducts qualitative and quantitative research on its damage to rock masses.The adopted methods and main findings are as follows:(1)According to differences in the type and grade of damage,the research area is separated into high and low damage zones.The forms of damage manifest as macroscopic ruptures and fissures strongly opened or regenerated in the high damage zone,while collapses and tension cracks in the rear of the rock mass are discovered in the low damage zone.(2)The degree of rock mass damage can reach an extreme value near the seismogenic fault.The linear density of structural planes increased by 3.44％relative to pre-earthquake levels,and the numerical density of structural planes increased by an average of 6.46％.Additionally,this research introduced an indicator to correct the surveyed damage degree.(3)By using the analytic hierarchy process method,this research es-tablished a coseismic rock mass damage evaluation and prediction model.The model considered eight influencing fac-tors,including lithology,epicentral distance,Geological Strength Index(GSI),slope structure,distance from fault,shear wave velocity(VS30),peak ground acceleration(PGA),and peak seismic velocity(PGV).The results show that the assessment is similar to the actual coseismic damage degree.Hence,this study can provide new scientific evi-dence for understanding the formation mechanism of seismic secondary disasters.关键词
地壳岩体/同震损伤/结构面密度/损伤特征/泸定地震Key words
Crustal Rock mass/Coseismic damage/Density of structural plane/Damage characteristics/Luding earthquake引用本文复制引用
张亦凡,伍纯昊,李渝生,易树健..同震岩体损伤特征的定量分析——以2022年泸定Ms6.8地震为例[J].工程地质学报,2024,32(3):1020-1034,15.基金项目
第二次青藏高原科学考察研究项目(资助号:2019QZKK0906),国家自然科学基金项目(资助号:41941017,42201096).This research is supported by the Second Tibetan Plateau Scientific Expedition and Research Program(Grant No.2019QZKK0906)and the National Natural Science Foundation of China(Grant Nos.41941017,42201096). （资助号:2019QZKK0906）
