地震工程学报2025，Vol.47Issue(3)：554-565,12.DOI:10.20000/j.1000-0844.20230705001
马尔康地震公路边坡病害机制与震后次生灾害效应
Mechanisms of highway slope failures induced by the Maerkang Ms6.0 earthquake and post-earthquake secondary disaster effects
摘要
Abstract
On June 10,2022,an Ms6.0 earthquake occurred in Caodeng Township,Maerkang City,Sichuan Province,triggering widespread slope collapses and landslides along the newly con-structed provincial highway S220(Ribu—Muerzha Bridge section,K0＋000-K56＋059).Based on detailed post-earthquake investigations of slope failures in the engineering area,this study sys-tematically summarizes the characteristics and mechanical mechanisms of earthquake-induced highway slope failures and discusses secondary disaster effects under alpine climate conditions.The slope failures induced by the Maerkang earthquake primarily manifested as localized rock-falls,individual landslide,isolated collapse,collapse zones,and high-altitude disasters(mainly soil landslides)exacerbated by topographic amplification of seismic waves in mountainous valleys.The mechanical mechanisms of highway slope failures in the epicentral area can be divided into five types:seismic cracking-damage type,bedding slip-tensile cracking type,toppling and crack-ing-collapse type,high-altitude debris flow type,and slope surface washout type.Seismic wave-induced tensile-shear damage to the rock and soil mass reduces slope stability,while gravitational potential energy in steep slopes drives instability and failure.Post-earthquake secondary disasters occurred in seismically damaged slopes under rainfall and freeze-thaw cycles in alpine environ-ments,with disaster types varying according to damage severity and different geological condi-tions.For highway slope protection,it is recommended to reduce reliance on flexible measures and adopt rigid-flexible combined support systems.The results of this study provides theoretical foundations for refined slope protection design by elucidating distinct failure mechanisms.关键词
马尔康地震/破坏特征/震裂损伤/力学机制/次生灾害效应Key words
Maerkang earthquake/failure characteristics/seismic cracking damage/mechanical mechanism/secondary disaster effects分类
土木建筑引用本文复制引用
白慧林,蒋国为,刘峰辉,孙徐,詹同安..马尔康地震公路边坡病害机制与震后次生灾害效应[J].地震工程学报,2025,47(3):554-565,12.基金项目
四川省科技计划资助(MZGC20240038) （MZGC20240038）
四川公路工程咨询监理有限公司科研项目(2023001) （2023001）
国家自然科学基金(41977252) （41977252）
