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1.西南交通大学土木工程学院,四川 成都 610031
2.西南交通大学抗震工程技术四川省重点实验室,四川 成都 610031
3.中国地震局工程力学研究所地震工程与工程振动重点实验室,黑龙江 哈尔滨 150080
4.中国地震局工程力学研究所地震灾害防治应急管理部重点实验室,黑龙江 哈尔滨 150080
Received:08 July 2025,
Revised:2025-08-18,
Published:28 April 2026
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潘毅,刘方琳,郭欣等.泸定6.8级地震磨西镇建筑坠落物模拟及其对道路通行的影响[J].防灾减灾工程学报,2026,46(02):291-302.
PAN Yi,LIU Fanglin,GUO Xin,et al.Simulation of Falling Debris from Buildings in Moxi Town during MS 6.8 Luding Earthquake and Its Impact on Road Capacity[J].Journal of Disaster Prevention and Mitigation Engineering,2026,46(02):291-302.
潘毅,刘方琳,郭欣等.泸定6.8级地震磨西镇建筑坠落物模拟及其对道路通行的影响[J].防灾减灾工程学报,2026,46(02):291-302. DOI: 10.13409/j.cnki.jdpme.20250708003.
PAN Yi,LIU Fanglin,GUO Xin,et al.Simulation of Falling Debris from Buildings in Moxi Town during MS 6.8 Luding Earthquake and Its Impact on Road Capacity[J].Journal of Disaster Prevention and Mitigation Engineering,2026,46(02):291-302. DOI: 10.13409/j.cnki.jdpme.20250708003.
强震发生时沿街建筑所产生的坠落物往往对灾区城市道路的通行能力造成不同程度的影响。以位于川西山区的磨西镇为研究对象,探讨2022年泸定6.8级地震引发的道路通行能力退化问题,分析建筑坠落物对震后交通系统的影响机制。基于震害调查与遥感影像数据,建立建筑群结构弹塑性时程分析模型与多刚体动力学倒塌模型,模拟泸定地震中磨西镇建筑群震害,评估坠落物空间分布。在此基础上,分析地震烈度、建筑结构类型等因素对山区城镇建筑群坠落物分布和道路通行能力的影响。研究结果表明,基于本文模拟方法获取的坠落物分布范围和形态与实际震害调查结果基本吻合。建筑坠落物的空间分布受地震烈度、结构类型与地形位置影响显著。地震强度增加,坠落物覆盖范围增大,其中,砖砌体结构和未抗震设防结构增长幅度明显。而磨西台地独特的地形特点使得台地边缘建筑坠落物分布范围大于台地中部。临街建筑产生的坠落物显著影响道路的通行能力,在9度设防地震动作用下导致部分路段通行能力下降超过50%,当地震作用达到9度极罕遇水准时,道路堵塞路段占比超过70%,交通系统接近瘫痪。本文研究旨在为西南山区城镇地震应急救援通道规划与震后交通恢复提供参考。
Falling debris from buildings along streets during strong earthquakes often affects the capacity of urban roads in disaster-affected areas to varying degrees. Taking Moxi Town in the mountainous area of western Sichuan Province as the study area
this study investigated the degradation of road capacity caused by the 2022 Luding
M
s
6.8 earthquake and analyzed the influence mechanisms of falling debris on the post-earthquake transportation system. Based on seismic damage surveys and remote sensing imagery data
an elastoplastic time-history analysis model for building clusters and a multi-body dynamics collapse model were established to simulate the seismic damage of bu
ilding clusters in Moxi Town during the Luding earthquake and to assess the spatial distribution of falling debris. On this basis
the effects of seismic intensity
building structural types
and other factors on the distribution of falling debris and road capacity in mountainous towns were analyzed. The results showed that the distribution range and morphology of falling debris obtained by the simulation method in this study were basically consistent with the results of actual seismic damage surveys. The spatial distribution of building falling debris was significantly affected by earthquake intensity
structure type
and topographic location. As earthquake intensity increased
the coverage of falling debris expanded
with a significant increase observed for brick masonry structures and structures without seismic fortification. The unique topographic characteristics of the Moxi terrace resulted in a larger distribution range of falling debris from buildings at the terrace edge than those in the central area of the terrace. Under the 9-degree fortification ground motion
the capacity of some road sections decreased by more than 50%. When the seismic action reached the 9-degree extremely rare earthquake level
the proportion of blocked road sections exceeded 70%
and the transportation system was close to paralysis. This study provides a reference for planning earthquake emergency rescue routes and post-earthquake traffic restoration in mountainous towns of southwestern China.
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