A New Method for liquefaction-induced lateral spread zonation based on 3D GIS
LI Chengcheng1,YUAN Xiaoming1,CAO Zhenzhong2,LI Ruishan1
1 Institute of Engineering Mechanics, China Earthquake Administration; Key Laboratory of Earthquake Engineering and Engineering Vibration of China Earthquake Administration, Harbin 150080, China
2 Laboratory of Geomechanics and Geotechnical Engineering , Guilin University of Technology, Guilin, Guangxi,541004, China
Site liquefaction is a typical earthquake disaster,the most serious of which is liquefaction lateral displacement,and its zoning work is an important means to avoid and mitigate the disaster.The liquefaction lateral displacement zoning technology of NEHRP(National Earthquake Hazards Reduction Plan of US)represents the international advanced level at present,but it is a method based on single point lateral displacement formula and 2D GIS.Its reliability and accuracy depend heavily on high-density boreholes.Based on the essential requirement of seismic zoning and abandoning the point-surface zoning of NEHRP,a new method of liquefaction sideways zoning based on 3D GIS was proposed in this paper.By solving the key techniques of extracting surface elements such as the thickness of liquefaction lateral displacement layer and the content of fine-grained soil,the characteristic distribution of liquefiable soil layer was obtained,and combined with the criteria of liquefaction lateral displacement grade proposed previously,The zoning map of liquefaction lateral displacement suitable for small area and medium area could be given.By using the new method,the scale distribution of liquefaction lateral displacement in the south area of Tangshan under the M7.8 earthquake was obtained,which was in agreement with the aerial survey results after the 1976 Tangshan earthquake.It was shown that the new method is reasonable and feasible.This method overcomes the drawback of NEHRP method depending on high density borehole,ensures the accuracy of liquefaction lateral displacement zoning and greatly reduces the cost.
李程程1，袁晓铭1，曹振中2，李瑞山1. 基于3D GIS的液化侧移区划新方法[J]. 振动与冲击, 2018, 37(23): 204-212.
LI Chengcheng1,YUAN Xiaoming1,CAO Zhenzhong2,LI Ruishan1. A New Method for liquefaction-induced lateral spread zonation based on 3D GIS. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(23): 204-212.
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