工程科学与技术2024，Vol.56Issue(1)：117-126,10.DOI:10.15961/j.jsuese.202201236
泸定地震诱发灾害特征分析
Characterization Analysis of Triggered Disasters in the Luding Earthquake
摘要
Abstract
In September 5th 2022,an earthquake measured Ms 6.8 occurred in Hailuogou scenic spot,Luding County,Sichuan Province,and its intensity at epicenter is Ⅸ.Compared with Wenchuan earthquake(Ms 8.0)in 2008 and Lushan earthquake(Ms 7.0)in 2013,its magnitude is smaller.However due to the mountainous topography,the earthquake-triggered geological disasters are highly developed,obstructed traffic lines and caused 118 persons dead or missing.In order to investigate the earthquake-triggered disasters and loss,a 5-days field visit is taken to the af-fected area of Luding County and Shimian County.Based on the collected data and regional geological information,the analysis is conducted to formulate the development of geological disaster,the damage of civil structures and human fatalities.The major findings can be summarized as follow.1)The hanging-wall effects of geological disasters are not obvious,which mainly occur in the areas with earthquake intensity of more thanⅦ,and are small in volume and can be categorized mainly as rock fall and gravel/sand/debris slide.The rock planar slide and soil slump can be occasionally witnessed.2)The landslide types are controlled by geological conditions.The upstream Detuo town in Luding County belongs to the Dadu river valley which is hot and arid,where the slope mass is highly loosened but slightly weathered,and the disaster type is mainly rock fall.However,downstream of the town,the valley is humid,the slope mass is both highly loosened and weathered,and gravel/sand/debris slide is the major failure type.3)Geological disasters appear mainly in the areas of mountain ridge,intersection of gentle and steep slope,the walls of an erosion gully and highway lines.Engineering disturbance is an enhancing factor for the dense distribution of disasters and human fatalities.4)Damage of civil structures mainly occurred in the areas with intensity of Ⅸ and is most serious in Moxi town.The construction quality of rural self-built houses and old buildings is the main problem affecting the anti-seismic capacity of the structures.The seismic site effect should be con-sidered during post-quake reconstruction.5)In the region of alpine and deep valley,it is effective to reinforce highway slope and to keep a build-ing site away from the affected zone of possible rock falls,thus to reduce disasters and human fatality.关键词
泸定地震/地质灾害/结构震损/地质条件/场地效应/防控措施Key words
Luding earthquake/geological disaster/structure damage/geological condition/site effect/control measure分类
天文与地球科学引用本文复制引用
邓建辉,韦晓,戴仕贵,邓辉..泸定地震诱发灾害特征分析[J].工程科学与技术,2024,56(1):117-126,10.基金项目
国家自然科学基金区域创新发展联合基金项目(U22A20601) （U22A20601）
第二次青藏高原综合科学考察研究专题(2019QZKK0905) （2019QZKK0905）
