甘肃积石山 M_(s)6.2级地震的震害特征与启示  

Characteristics and implications of seismic damage in Jishishan M_(s)6.2 earthquake,Gansu Province

作　　者：王丽丽[1,2] 王兰民 卢育霞[1] 许世阳[1] 夏晓雨 盖海龙 池佩红 郭梅 WANG Lili;WANG Lanmin;LU Yuxia;XU Shiyang;XIA Xiaoyu;GAI Hailong;CHI Peihong;GUO Mei(Key Laboratory of Loess Earthquake Engineering,China Earthquake Administration,Lanzhou 730000,China;State Key Laboratory of Continental Dynamics,Northwest University,Xi’an 710069,China;Qinghai Earthquake Agency,Xining 810005,China)

机构地区：[1]中国地震局黄土地震工程重点实验室,甘肃兰州730000 [2]西北大学大陆动力学国家重点实验室,陕西西安710069 [3]青海省地震局,青海西宁810005

出　　处：《世界地震工程》2024年第1期58-71,共14页World Earthquake Engineering

基　　金：地震科技星火计划项目(XH23043YA);地震科学联合基金项目(U1939209);甘肃省科技计划项目(21JR7RA788)。

摘　　要：2023年12月18日,甘肃省临夏回族自治州积石山保安族东乡族撒拉族自治县(35.70°N,102.79°E)发生了6.2级地震,震中烈度为VIII度。地震发生后,通过实地烈度评估与科学考察,对震区VI~VIII度区不同建(构)筑物与生命线工程的震害特点进行了统计分析;从抗震设计与施工管理、场地放大效应与地震次生灾害对建筑结构抗震性能的影响等角度,提出了此次地震的震害启示。结果表明:1)严重破坏和毁坏的建筑结构主要集中在老旧的土木结构、砖木结构和无设防或设防不规范的砖混结构。2)造成建筑结构破坏的主要原因是少量自建房抗震设计和施工的不规范、场地放大效应和地震次生灾害。3)优化和改良生土砌筑材料,改进纵横墙间的拉结措施,强化结构整体性是提高土木结构抗震的有效方法;普及“上下圈梁与构造柱”等基本抗震设防措施,规范水泥砂浆强度,提升农村工匠的施工水平,可有效提高砌体结构的整体性,避免房屋出现整体性垮塌;室内洗手间的墙体应该与房顶、纵横墙间建立有效联接,提高结构的抗震性能。4)孤突斜坡、河流高阶地与岸边为抗震不利地带。当建造用地极为匮乏,不得不选址在这些场地之上时,应该综合考虑场地的地形地貌特征、岩土体物理力学特性、水文地质条件、抗震设防目标、建筑结构类型等影响因素,做好地震灾害风险评估,根据评估结果进行科学设防。灾后重建过程中,应由政府统一规划选址、统一设计,规范施工。On December 18,2023,a M_(s)6.2 earthquake occurred in Jishishan Bao’an Dongxiang and Salar Autonomous County,Linxia Hui Autonomous Prefecture,Gansu Province(35.70°N,102.79°E),with an epicenter intensity of VIII degree.After the earthquake,the authors carried out intensity assessment and scientific investigation of the disaster area,statistically analyzed the seismic damage characteristics of different buildings(structures)and lifeline projects in the VI~VIII degree area,and put forward the lessons learned from the earthquake in terms of seismic design of houses and construction management,site amplification effect and seismic secondary hazards,and so on.The results of the study show that:1)The severely damaged and destroyed building structures are mainly concentrated in the old earth-wood buildings,brick-wood buildings,and brick masonry buildings with no or unstandardized defenses.2)The main reason for the destruction of building structures is the non-standardized seismic design and construction of self-built houses,and at the same time,amplification effect of sites and the secondary disaster of earthquakes are also the important reasons for the intensity abnormality and aggravation of the destruction.3)Optimizing and improving the raw earth masonry materials,improving the tie measures between vertical and horizontal walls,and strengthening the structural integrity are effective ways to improve the seismic resistance of civil engineering structures.Popularizing basic seismic measures such as“upper and lower ring beams and structural columns”,standardizing the strength of cement mortar,and upgrading the construction level of rural craftsmen can effectively improve the structural integrity of masonry structures and prevent the complete collapse of houses.The walls of indoor restrooms should be effectively connected with the roof and vertical and horizontal walls to improve the seismic performance of the structure.4)Slopes,high river terraces and banks are seismically unfavorable zones.When land for construc

关 键 词：积石山6.2级地震 震害调查 场地放大效应 黄土液化流滑 震害特征 

分 类 号：U211.9[交通运输工程—道路与铁道工程]