Technology Research On The Constructing And Incision Analysis Of 3D Geological Fault Structure Model

In the nines of the twentieth century,people began to pay attention to 3D geological modeling,and gradually,this technology became to be focused on by people in the field of Mathematics geology,Petro!eum proving,Rock engineering,GIS and Visualization in Scientific Computing.3D geological modeling will build two types of models including 3D geological structure model and 3D geological attribute model. As a rule,the building of attribute model depends on the building of structure model. Now simple layer geological entities' modeling technology is already solved ripely,but fault structure modeling is the key problem and difficulty of 3D geological structure modeling,it is also the nowadays researching focus of correlative scholars.3D fault structure modeling faces mainly two difficulties,One is the design of the 3D spatial data model which fit to the 3D geological fault structure model,the other is the method of building the model.This paper takes "the project of city geology survey " as background .studying the chararcteristic of city geology data and then achieving the management to city geology data. On the management basis and the characteristic of fault constructure,this paper devises a new 3D spatial date model which is stated as wire-frame model and define systematically the fundamental elements and data structure,The wire-frame model can not only describe effectively the geometry and topology of the fault strcture model,but also avail to build the model rapidly and effectively.Then basing on the wire-frame model ,this paper dissertates in detail the mehold of constructing 3D fault structure model including the building of directed arx, directed face, directed block.,Some key algorithms have been solved such as the constructing algorithm from the faces to blocks,this algorithm can implement the conversation from the arbitrary spatial directed faces to directed blocks.In the last part of this paper,the author also discusses space triangle net incision algorithm-tricut, and basing on this algorithm, realize the incision on the 3D geological structure model. This part pays emphases on the algorithm implement of plane section for one block ,and basing on the algorithm,these functions such as the creation of plane section,folded section and the implement of beeline incision,foldline incision, combination incision,digging pit, tunnel modeling have been carried out.Practice has prove that the wire-frame can describe effectively the fault geology constructure,can implement the query in relation to topology. The method which base the wire-frame model treats with the intersection processing before the geological face triangle nets have been builded, simplify the incision between two faces to management among lines.This...