2014年“524”、“530”盈江地震中地形及土层条件对房屋震害影响分析
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摘要
在历次地震中,地形、地貌及场地条件复杂的山区容易出现房屋建筑震害异常情况。分析震害异常的原因,对于进行建筑抗震设防以减少地震灾害损失具有重要意义。本文主要对2014年盈江524、530两次地震后Ⅷ度区的卡场镇麻竹岭岗房屋破坏及场地条件情况进行调查,根据麻竹岭岗的地形条件由高到低分为3个区,对3个区内的建筑破坏情况进行分析比较,表明震害程度呈现出明显的从山底至山顶逐渐加大的趋势,揭示出显著的山体影响作用。重点对山顶的穿斗木结构破坏情况进行了分析,找出了造成建筑结构破坏的几个不利因素,包括山丘地形顶部放大效应、覆盖土层放大效应以及多次地震震害累积效应。
Some abnormal damage appeared due to the complicated mountainous topography and site conditions during earthquake. It is of great significance to analyze the damage factors for seismic fortification of local or similar area,which will reduce the losses caused by earthquake disasters. Based on the on-site investigation,we studied the building damage of Mazhulinggang during Yingjiang earthquakes. According to geographic conditions,the village was divided into three zones from high to low. It presented the obvious increase trend of earthquake damage gradually from the bottom to the top of the mountain,and showed significant mountain amplification. Several adverse factors for building damage to a through type timber frame on the top of the mountain were discussed,including the effect of hill terrain amplification,the soil amplification,slope amplification and multiple earthquake accumulative effect.
Some abnormal damage appeared due to the complicated mountainous topography and site conditions during earthquake. It is of great significance to analyze the damage factors for seismic fortification of local or similar area,which will reduce the losses caused by earthquake disasters. Based on the on-site investigation,we studied the building damage of Mazhulinggang during Yingjiang earthquakes. According to geographic conditions,the village was divided into three zones from high to low. It presented the obvious increase trend of earthquake damage gradually from the bottom to the top of the mountain,and showed significant mountain amplification. Several adverse factors for building damage to a through type timber frame on the top of the mountain were discussed,including the effect of hill terrain amplification,the soil amplification,slope amplification and multiple earthquake accumulative effect.
引文
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[4]刘爱文宋毅盛李方杰.宁洱6.4级地震庙山垭口附近的震害现象[J].震灾防御技术,2007,2(3):270-278.LIU Aiwen,SONG Yisheng,LI Fangjie.Damage characters of Ning’er M6.4 earthquake near miaoshan poort[J].Technology for Earthquake Disaster Prevention,2007,2(3):270-278.(in Chinese)
[5]张加桂,黄体庄,雷伟志.2008年云南盈江地震震害特点及抗震防灾启示[J].地质通报,2009,28(8):1077-1084ZHANGJiagui,HUANG Tizhuang,LEI Weizhi.Features of earthquake disasters happened in Yingjiang county,Yunnan province,China during2008 and several implications regarding earthquake disaster prevention measures[J].Geological Bulletin of China,2009,28(8):1077-1084.(in Chinese)
[6]陈坤华,卢永坤,张彦琪.盈江5.8级地震的震害特征及破坏机理[J].地震研究,2012,35(1):110-116.CHEN Kunhua,LU Yongkun,ZHANG Yanqi.Seismic disaster characteristic and damage mechanism of the Yingjiang MS5.8 earthquake[J].Journal of Seismological Research,2012,35(1):110-116.(in Chinese)
[7]王世元,何玉林,吴今生.2013.四川芦山7.0级强烈地震高烈度区房屋震害特征[J].灾害学,28(4):125-131.WANG Shiyuan,HE Yulin,WU Jinsheng.Building damage characteristics in highly seismic region during Lushan M7.0 earthquake[J].Journal of Catastrophology,2013,28(4):125-131.(in Chinese)
[8]施伟华,陈坤华,杨树明,等.盈江2011年MS5.8与2008年MS5.9地震的震害差异及原因[J].地震研究,2011,34(4):519-524.SHI Weihua,CHEN Kunhua,YANG Shuming.Differences between the MS5.8 earthquake damage and the MS5.9 earthquake damage in Yingjiang:the possible reason[J].Journal of Seismological Research,2011,34(4):519-524.(in Chinese)
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