GIS在求解地基附加应力中的应用

依据Newmark感应图法基本原理,在对感应图稍做改进的基础上,将GIS的空间分析和数据管理功能应用于感应图法,求解任意形状竖向均布荷载作用下的地基附加应力。在计算机绘图的基础上,利用ARC/INFO软件进行图层拓扑叠加和空间数据及其属性数据的操作与管理,实现对任意形状、任意一点、任意深度的附加应力计算。同时,可以在计算机屏幕上显示各阶段图层及相应的属性数据,可视性强。根据需要,可随时进行图形和属性数据的调整。技术措施的实现过程简单,可操作性强。与传统的感应图法相比,减少了绘图工作量,消除了人为误差,提高了计算精度。

Application of GIS in Calculating of Additional Stresses in Foundation

According to the basic theory of Newmark inductive graphic method, the author ameliorated the inductive graph slightly. Some of function of GIS, such as spatial analysis, data management etc, were applied to calculate additional stresses in foundation under irregular vertical balanced distribution loading area. The maps made by computer were changed into coverages in ARC/INFO. After the topology overlay, the additional stress in foundation of any point was calculated no matter where it was located in irregular form, by means of the operation and management of spatial data and attribute data. Meanwhile, the coverages and their attribute can be shown in the screen, which strengthened the visibility. So the figure and the attribute could be regulated at any time when necessary. The whole procedure of the calculating skills was characterized by simplicity and high operability. Compared to the old inductive graphic method, the new one had many peculiarities, such as reducing the work quantity of mapping, eliminating manmade error and raising accuracy .