汶川地震中一个特殊场地研究初探  

Preliminary study on a special site in Wenchuan earthquake

作　　者：齐文浩[1,2] 薄景山[2,3] 郭迅[2] 刘德东[2] 刘奇斌[4] 

机构地区：[1]哈尔滨工程大学航天与建筑工程学院,黑龙江哈尔滨150001 [2]中国地震局工程力学研究所,黑龙江哈尔滨150080 [3]防灾科技学院,河北三河065201 [4]黑龙江省哈双高速公路管理处,黑龙江哈尔滨150090

出　　处：《地震工程与工程振动》2010年第3期53-58,共6页Earthquake Engineering and Engineering Dynamics

基　　金：中国地震局工程力学研究所基本科研业务费专项(2008B008);国家自然科学基金项目(50978237);地震行业科研专项(200708039)

摘　　要：为探明汶川大地震中汉源县城高烈度异常的原因,对汉源县城震害进行了科学考察。依据震害情况,首先考察了汉源县城的建筑结构破坏,在此基础上圈定了严重破坏范围,然后考察了几处液化现象,最后对背后山滑坡进行了考察,并作了简要分析。根据汉源县城震害科学考察的结果,对汉源县城5个场点进行了对比性的地脉动测试。测试结果表明,震害严重的汉源二中、老财政局和汽车站3个场地的自振频率较小,而震害较轻的流沙河左岸和萝卜岗2个场地的自振频率较大。初步揭示了汉源县城高烈度异常的可能原因是砂土液化、滑坡和场地软弱。In order to explain the reason why abnormal intensity occurred in Hanyuan county town during Wenchuan earthquake,scientific investigation was carried out aiming at the earthquake damage to Hanyuan.According to the general damage case,firstly,the collapse of the buildings of the town were investigated,and a damage range based on the investigation was delineated.Secondly,some places with liquefaction phenomena were investigated.Finally,the Beihou Mountion landslide was investigated,too.All the earthquake damage was analyzed briefly.According to the investigation result,the microtremor character on some sites was tested comparatively.The test results show that the natural frequencies are small in the sites of Hanyuan No.2 school,old financial bureau and bus station,while the natural frequencies are bigger in the sites of the left bank of Liusha river and Luobugang.It is shown that the reasons resulting in the abnormal intensity may be soil liquefaction,landslide and soften sites.

关 键 词：汶川地震 特殊场地 烈度异常 汉源县城 地脉动 

分 类 号：P315.08[天文地球—地震学]