GIS-BASED EARTHQUAKE DISASTER PREDICTION AND OPTIMUM PATH ANALYSIS FOR THE URBAN ROAD TRANSIT SYSTEM

摘要

In the earthquake disaster prediction of the urban road transit system (simplified as URTS), for bridge, 9 factors including the earthquake intensity, ground soil type failure extent of ground soil, superstructure type, the height, type and material of bridge pier, span length and span number of bridge were considered; for road, 7 factors including the primary earthquake intensity, soil type of the roadbed and ground, failure extent of ground soil, roadbed type, roadbed height and designed earthquake intensity were considered. The computer program for predicting the earthquake disaster of URTS was implanted in the GIS platform "Information System for Earthquake Resistance and Disaster Mitigation", which was developed based on SuperMap Objects. The prediction of earthquake disaster for the global or the arbitrary partial road sections within the URTS could be performed. Introducing the Warshall algorithm in Chart Theory, the connective reliability analysis for URTS was performed, and the connective probability matrix for road sections was provided. Considering the connective probability of URTS, adopting the method that each road section were designated a weight according its length, the optimum path between the arbitrary two points could be calculated and displayed in the interface. The calculation and analysis above mentioned were visually realized and demonstrated based on the GIS platform developed.