松原5.7级地震砂土液化研究  

Study on sand liquefaction of the magnitude-5.7 Songyuan earthquake

作　　者：李平[1] 田兆阳[1,2] 薄景山[1] 李孝波[1] 张宇东[1] 辜俊儒 周春澍 Li Ping;Tian Zhaoyang;Bo Jingshan;Li Xiaobo;Zhang Yudong;Gu Junru;Zhou Chunshu(Institute of Disaster Prevention, Sanhe 065201, China;Shandong Earthquake Administration, Jinan 250014, China)

机构地区：[1]防灾科技学院,河北三河065201 [2]山东省地震局,山东济南250014

出　　处：《土木工程学报》2019年第9期91-99,共9页China Civil Engineering Journal

基　　金：国家自然科学基金青年基金（51508096）;河北省拔尖人才计划项目

摘　　要：2018年5月28日吉林省松原市宁江区发生M5.7级地震,震中地区出现典型罕见的大范围砂土液化现象。通过震害现场调查,结合钻探取样、标贯试验、波速测试及静力触探等试验测试手段,查明震害情况和场地特性,初步分析此次大范围砂土液化的形成条件和影响因素。调查结果表明,此次地震液化区域面积约80km^2,宏观现象主要以水稻田内表喷水冒砂为主,未造成建筑物大规模破坏,且区域内土层分布相对单一,液化分布主要受地震动、地形地貌及地下水位等因素控制;液化土层埋深主要在10m以内,并且钻探揭露一处埋深17m左右黏土层中的液化砂土上升通道,证明本次地震中出现明显的深层砂土液化现象,该现象在地震现场调查往往被忽略;静力触探在鉴别液化层位、获取土层物理力学参数上具有一定优势,较适用于震后现场调查工作。另外,松原市具有发生更大规模砂土液化的可能性,在防震减灾规划及建设工程勘察设计等项目中,对该地区的砂土液化情况需进行专门研究。A 5.7-magnitude earthquake was recorded in Songyuan of Jilin province on May 28, 2018, and a large range of typical and rare sand liquefaction was observed in the epicenter of the earthquake. To ascertain the earthquake damages and site characteristics, field survey and experimental testing(including boring sampling, standard penetration testing, wave velocity testing and cone penetration testing) were performed, so that the causes and influence factors of sand liquefaction occurred in this earthquake can be preliminarily analyzed. The liquefaction covered a total area of 80 km^2. Macroscopically, sand boil and water sprouting in paddy field could be observed, without large-scale collapses of structure occurring. Within the range, the distribution of soil layers is relatively unitary, and the liquefaction distribution is mainly affected by those factors such as ground motion, landform and groundwater level. The depth of liquefied sand layers was mainly within 10 m, and the liquefaction rising passage of deep sand layer with a burial depth of about 17 m was disclosed by drilling, indicating that the evident deep-layer sand liquefaction phenomenon occurred in this earthquake, but this phenomenon was often ignored in the site investigation of earthquake. Cone penetration test possesses certain superiority in identifying the layer of liquefaction and attaining the physical and mechanical parameters of soil layers, and shall be suitable for the site survey after earthquake. Furthermore, there is a risk of larger-scale sand liquefaction occurring in Songyuan city. The sand liquefaction hazard in this area shall be specially studied in those projects of earthquake prevention and disaster mitigation planning as well as engineering survey and design.

关 键 词：松原地震 砂土液化 现场调查 静力触探 

分 类 号：P315.9[天文地球—地震学] TU441[天文地球—固体地球物理学]