Comprehensive Study On Seismic Emergency Handling Technology

Earthquakes will bring serious damage to lifeline systems by causing structural damage and loss of lifeline function. If the lifeline system is equipped with seismic emergency handling ability, certain emergency operations can be taken when the earthquake strikes, a number of secondary disasters and casualties can be avoided or decreased. Several studies on seismic emergency handling of two representative type of lifeline system, gas pipeline network and high-speed railway system, is done in the thesis.For urban gas network, The composition and functions of the seismic emergency handling system is analyzed; the features of the SCADA system, which is commonly used in urban gas supply network for daily dispatching and management, is introduced; the feasibility of adding seismic emergency handling ability to SCADA system and applying GIS functions in SCADA system is discussed; according to the principles of seismic emergency handling, a simulation program is written based on ArcGIS geographic software and VBA programming, which can demonstrate the process of emergency handling when an earthquake strikes a gas network with elements such as gas sources, gas users and control valves.For high-speed railway system, the models of the high-speed train is established; the railway track irregularity sample is generated by numerical simulation on the power spectrum density function, and is used as the external encouragement of the train; a more precise profile of wheel and rail is considered, and the normal forces and creep forces is calculated based on Hertz nonlinear contact theory and Kalker linear creepage theory; the equations of motion is solved using Newmark-βnumerical integration, and a calculation program is written in MATLAB, which can figure out and compare the dynamic response of the train with different parameters. Several typical strong motion seismic records is chosen, the dynamic response of the train running under earthquakes is analyzed, and several quotas are used to judge whether the running train is safe. How the train speed and seismic strength affect the train safety is summarized, and a preliminary suggestion of the seismic emergency handling threshold value of the high-speed railway system is made.