Some Studies On Fracture Orientation

Fracture is weak structural plane of rock mass, including fault, joint, cleavage, etc. Fracture has greater influence on rock mass deformation, strength, destructive mechanism and destructive mode than rock mineral components. And it is the passage of fluid flow and solute transportation. Therefore, it is an important means of mastering rock nature to study rock fracture.The influence is very different on mechanical properties and flow process,because of the fracture's geometric features of various location, shape, orientation and size. The study of fracture's geometric features is one of important parts in rock fracture study. Fracture orientation, among all geometric features, is one of important reasons why rock mass has heterogeneity,anisotropy and discontinuity.The main focus of this paper is the study on rock fracture's orientation. Because of fracture wide distribution,difficulty in site investigation,large volume of data and large amount of calculation of statistical analysis in using traditional Method,this paper uses Visual C++ to program and simulate. In other words, Study fracture orientation by means of computers.Considering that fracture forming reason, mechanical characteristics and geometric features are similar in the same group, first, fractures is grouped by cluster analysis. Then, by programming realization, rose diagram and density contour are drawn to compare and validate the result of fracture grouping. It shows that the results of three statistical analysis methods are almost same. And the method of fractures grouping is right and reliable.In order to obtained Statistics characteristics, the next step is to fit distribution function parameters for fractures grouped. After Fitting, distribution function parameters values,mean values,maximum and minimum can be obtained.On account of large quantity of fractures in rock mass and limitation of Exploration Method, and to prove the correctness of fitting step, this paper use Monte-Carlo method to generate random data of fractures orientation. The data accords with the Fitted parameters of last step.At last, in order to test FG.EXE's practicality, which is developed according to above research results, it is applied in the fractures orientation data of three Gorges dam base's left bank. The progress is draw fractures plot graph, fractures grouping, density contour, rose diagram and distribution parameters fitting and random data generation.