The Ray Tracing Numerical Simulation Study Of Typical Geological Anomalous Body In Tunnel Advance Prediction

In recent years, with the development of tunnel engineering, the question of geological disaster was prominent during the construction, such as water inflow, landslide, crag explodes and so on .These questions influence the progress of the project seriously, and increase the construction cost, some even cause the project to failure. In order to avoid or reduce these questions, and make the construction safe and fast, the geological forecast occur in the moment. In the project implementation, the geological forecast method was taken into account for its reliable in the field of the engineering, and widely used in the long and key tunnel construction.The method of geological forecast attract many researchers for its forseeability and they published many articles, But most of the articles and the research are focus only the succeeded application by the method, and the defeat situation and technical flaw are involved rarely. And it is very few to simulate the foundation of the principle of this method.In my paper I introduces some common tunnel geology forecast methods and their good and bad aspects. Because of the TSP method is not very effect in the Karst area, my paper used the infinite element method to simulate all kinds of distribution diagram of ray reflection. And make an intensive study of it.In my paper I use the principle of seismic wave propagation theory which is perfect in the field of the petroleum exploration, and introduce all kind of time-distance curve to the reflect wave in the interface. Write programs based on the principle of shooting the line tracks. based on the TSP instrument gathering arrangement, and use reciprocity principle and the arrangement form which is a source and many receives, and research the situation of the front geological surface, it is successful to simulate the geology surface and the tracks in each geological surface reflection . for the time urgency, it is a pity that I may not used the energy ways to research, and only used the energy method which is an accommodating method to research the tracks reflection , assume the closer receiver half distance as a radius, take the receiver as a center of a circle, Take the circumstance of level interface as standard to the data which receives in the scope, carried on mutually in addition to contrasting, Be in the earthquake synthesize the record carry on adding to multiply by relatedly, and achieved the expectation result.Finally I analyzed the data of Mountain YuanLiang tunnel which provided by the China Railway Tunnel Bureau Group. To several geology situations which didn't be forecasted very well during tunnel construction, the defeat reason has approximately analyzed by observed data. Finally I use my program simulated the related geological surface and its tracks reflection.