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《地震工程和工程振动(英文版)》 2010-02
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Distribution and characteristics of gravelly soil liquefaction in the Wenchuan M_s 8.0 earthquake

Cao Zhenzhong1,Hou Longqing2,Xu Hongmei2 and Yuan Xiaoming1 1. Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China 2. East China Institute of Technology,Fuzhou 344000,China  
In this paper,a distribution map of gravelly soil liquefaction that was caused by the Wenchuan M_s 8.0 earthquake in China is proposed based on a detailed field investigation and an analysis of geological soil profiles. The geological background of the earthquake disaster region is summarized by compiling geological cross sections and borehole logs. Meanwhile,four typical liquefied sites were selected to conduct sample drillings,dynamic penetration tests (DPT),and shear wave velocity tests,to understand the features of liquefied gravelly soil. One hundred and eighteen (118) liquefied sites were investigated shortly after the earthquake. The field investigation showed:(1) sandboils and waterspouts occurred extensively,involving thousands of miles of farmland,120 villages,eight schools and five factories,which caused damage to some rural houses,schools,manufacturing facilities and wells,etc.; (2) the Chengdu plain is covered by a gravelly soil layer with a thickness of 0 m to 541 m according to the geological cross sections; (3) there were 80 gravelly soil liquefied sites in the Chengdu plain,shaped as five belt areas that varied from 20 km to 40 km in length,and about ten gravelly soil liquefied sites distributed within Mianyang area; and (4) the grain sizes of the sampled soil were relative larger than the ejected soil on the ground,thus the type of liquefied soil cannot be determined by the ejected soil. The gravelly soil liquefied sites are helpful in enriching the global database of gravelly soil liquefaction and developing a corresponding evaluation method in further research efforts.
【Fund】: Fundamental Research Funds of Institute Engineering Mechanics and Earthquake Under Grant No.2009B01 and No.200708001;; National Natural Science Foundation of China Under Grant No.90715017;; International Corporation Project of Science and Technology Administration of China Under Grant No.2009DFA71720
【CateGory Index】: P315.9
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