摘要
根据九寨沟M_s7. 0地震现场调查结果,总结了甘肃文县低烈度区震害的一般特征,分析了低烈度区烈度异常点的震害特点,并对产生烈度异常的原因进行了探讨。调查和分析研究结果表明:由于研究区的建筑多在汶川M_s8. 0大地震后进行了重建或抗震加固,且地震持时较短,此次地震中低烈度区房屋震害总体较轻。然而,低烈度区存在建筑裂缝、滑坡、滑塌和桥梁损坏等显著的烈度异常现象,其主要原因是建筑场地位于滑坡体以及高陡边坡等抗震不利地带;此外,地震波的传播方向和研究区内岩土体的特性也是造成低烈度区烈度异常的重要因素。地震地质灾害需在地震烈度评定标准修订时予以重点考虑。
Acco the earthquake rding to the site investigation results of Jiuzhaigou Ms 7.0 earthquake, the general characteristics of damage in the low-intensity region of Wenxian County, Gansu Province were summarized. The char- acteristics of the earthquake damage at the abnormal points of intensity in the low-intensity region were analyzed. And the causes of abnormal intensity were discussed. The results of investigation and analysis show that many buildings in the study area were rebuilt or strengthened after the Wenchuan M~ 8.0 earthquake, and the duration of the earthquake was relatively short, so the earthquake damages of buildings in low-intensity region were relatively light in this earthquake. However, there were significant intensity anomalies in the low-intensity region, such as building cracks, landslides, slumps and bridge damage, which are mainly caused by the fact that the building sites are located in the anti-seismic adverse areas such as landslide and high and steep slope. In addition, the propagation direction of seismic waves and the characteristics of rock and soil in the study area are also important factors causing abnormal intensity in the low-intensity regions. Seismic geological disasters should be considered in the revision of seismic intensity assessment criteria.
作者
王谦
苏永奇
马占虎
车高凤
严武建
钟秀梅
陈文凯
郭鹏
WANG Qian;SU Yongqi;MA Zhanhu;CHE Gaofeng;YAN Wujian;ZHONG Xiumei;CHEN Wenkai;GUO Peng(Key Laboratory of Loess Earthquake Engineering,China Earthquake Administration ＆ Gansu Province,Lanzhou 730000,China;College of Civil Engineering and Mechanics,Lanzhou University,Lanzhou 730000,China;Lanzhou Institute of Seismology,CEA,Lanzhou 730000,China)
出处
《世界地震工程》
CSCD
北大核心
2018年第3期153-160,共8页
World Earthquake Engineering
基金
中国地震局地震预测研究所基本科研业务经费资助项目(2016IESLZ02
2016IESLZ01)
兰州市科技计划项目(2018-1-123)
国家自然科学基金资助项目(51408567
51778590)
关键词
地震
烈度异常
滑坡体
高陡边坡
震害
earthquake
abnormal intensity
landslide
high and steep slope
earthquake damage
