基于ArcGIS的液化小区划方法初步研究

发布时间：2018-07-31 12:52

【摘要】：本文对以GIS为基础的液化小区划技术进行了初步研究,收集唐山市区范围内的65个钻孔资料,将获得的有关砂土液化因素的属性信息和空间信息通过先进的Arc GIS技术组织成一个既能展现属性特征又能反映图形分布特征的地理信息数据库。根据钻孔勘测资料采用规范判别液化指数法和多因子线性回归液化判别法,运用Arc GIS中的VBA编程计算各测点的液化指数和液化势,采用克里格插值法由已知钻孔数据推测出未知钻孔数据区域的液化情况,最终得出基于Arc GIS的地震液化小区划图,为专家进行决策和工程应用提供直观系统的依据。借助专家对唐山大地震发生后三天拍摄的航拍片的解译,将其标定的液化范围与本文运用Arc GIS得出的液化小区划图进行对比,不同判别方法的液化等级分布与实际相符,验证了区划技术的适用性。此外虽然不同方法的液化判别成功率不同,但液化程度的分布都大致相同,与航拍片相一致,说明研究某一区域的液化程度和对某一种液化判别方法进行验证,不仅取决于测点的判别成功率,还可以从区划技术出发进行研究和验证。不同的判别方法得出的液化等级面积百分比有所不同,这取决于各个方法中参数的选取和方法的计算精度。
[Abstract]:In this paper, the liquefaction microzonation technique based on GIS is studied, and 65 boreholes in Tangshan are collected. The obtained attribute information and spatial information about sand liquefaction factors are organized into a geographic information database which can not only display the attribute features but also reflect the graphic distribution characteristics through the advanced Arc GIS technology. Based on borehole survey data, the standard discriminant liquefaction index method and multifactor linear regression liquefaction discrimination method are used to calculate the liquefaction index and liquefaction potential of each measuring point by using VBA programming in Arc GIS. Using Kriging interpolation method to infer the liquefaction of unknown borehole data area from the known borehole data, and finally to obtain the seismic liquefaction zoning map based on Arc GIS, which provides an intuitive and systematic basis for expert decision-making and engineering application. With the help of experts' interpretation of aerial photographs taken three days after the Tangshan earthquake, the range of liquefaction calibrated by this paper is compared with the liquefaction map obtained by Arc GIS in this paper. The liquefaction grade distribution of different discriminating methods is in accordance with the actual situation. The applicability of regionalization technology is verified. In addition, although different methods have different success rates of liquefaction discrimination, the distribution of liquefaction degree is roughly the same, which is consistent with the aerial photograph, which shows that the degree of liquefaction in a certain area is studied and a certain liquefaction discriminant method is verified. It not only depends on the success rate of measuring points, but also can be studied and verified from the regionalization technology. The percentage of liquefaction grade area obtained by different discriminant methods is different, which depends on the selection of parameters in each method and the calculation accuracy of the method.
【作者单位】：中国地震局工程力学研究所;
【基金】：中央级公益性研究所基本科研业务费专项(2013B10)
【分类号】：P208;TU435

【共引文献】