甘肃积石山6.2级地震房屋破坏特征分析

Characterization of buiding and rural damages at the epicenter region of the Jinshishan M6.2 earthquake

摘要:

摘要：2023年12月18日晚，甘肃省积石山县发生Ms6.2地震，震源深度10 Km。地震导致震区房屋不同程度损毁，并诱发了大量同震滑坡，造成了严重的人员伤亡和经济损失。分析不同结构房屋的破坏比与破坏特征、特点，对灾后应急救援及房屋重建安置工作具有非常重要的意义。基于已有文献资料、结合高精度遥感数据和野外调查数据，开展此次地震房屋破坏特征分析。结果表明：震中房屋及建构筑物破坏大河家镇最重、石塬镇、刘集乡、柳沟乡等次之。Ⅷ度区内土木结构房屋破坏比达90%以上，破坏形式以倒塌为主；砖木结构房屋破坏比达75%左右，多以严重破坏为主；砖混结构房屋破坏比达45%左右，破坏差异性较大，以中等破坏或轻微破坏为主，个别砖混结构房屋发生了非常严重的结构破坏；框架结构房屋填充墙产生大量裂缝与剪切破损。基于震后第一手资料，就不同结构类型房屋的破坏特征、特点，房屋破坏比及震后地震地质灾害与隐患等多方面进行了分析探讨，以期为灾后房屋重建、地震震后烈度调查与地震应急评估等相关工作提供一定的参考。

Abstract:

Abstract: On the night of December 18, 2023, an earthquake of Ms 6.2 occurred in Jieshishan County, Gansu Province, at a depth of 10 Km..The earthquake caused different level of damage to houses in the epicenter area and induced a large number of co-seismic landslides, which resulted in serious casualties and economic losses. Analyzing the damage ratio and damage characteristics of different structural houses is of great significance to the post-disaster emergency rescue and housing reconstruction and resettlement work. Based on the existing literature, combined with high-precision remote sensing data and field survey data, we carried out the characterization of the damage analysis of the houses in this earthquake. The results show that the damage of houses and structures in the earthquake center was most serious in Dahejia Town, followed by Shiyuan Town, Liuji Town, Liugou Town, etc. The damage ratio of earth and wood structure houses in the VIII degree area is more than 90%, with collapse as the main form of damage; the damage ratio of brick and wood structure houses is about 75%, with serious damage as the main form of damage; the damage ratio of brick and mixed structure houses is about 45%, with large difference in damage, with medium damage or slight damage as the main form of damage, and very serious structural damage occurred in individual brick and mixed structure houses; and the infill wall of the frame structure houses produced a large number of cracks and shear breakage. shear breakage. Based on the first-hand data after the earthquake, we analyzed and discussed the damage characteristics and features of different structural types of houses, the damage ratio of houses, and the seismic geological hazards and hidden dangers after the earthquake, with a view to providing certain references for the post-disaster reconstruction of houses, the investigation of post-earthquake intensity, and the assessment of seismic emergency response.