An automatic unified modeling method of geological object and engineering object based on tri-prism (TP)

Abstract

For the interaction relation between geological object and engineering object in some fields related to water conservancy and hydropower, a unified modeling idea was proposed. On the basis of summarizing both advantages and disadvantages of existing modeling methods, an automatic unified modeling method of both engineering and geological objects based on tri-prism (TP) model was presented. Through the lossless correction algorithm of deviated drill holes contained in this method, the real deviated drill holes could be corrected into the equivalent virtual vertical ones. And the correction accuracy fully meets the requirements of unified modeling. With the virtual vertical drilling data, TIN construction of both cover layer and other stratums would be built in order to obtain the 3D geological model. Then, the engineering design data would be introduced into the 3D geological model for achieving unified modeling. For this process, the volume subdividing and restructuring principles were introduced to deal with the spatial relationships between engineering object and geological object. In order to improve the efficiency of unified modeling, the reconstruction of TIN based on constraint information was also applied in this method. At last, the feasibility and validation of the unified modeling method as well as its relevant key algorithms were verified by specific experiments and analysis of results.

Keywords

tri-prism (TP) model / unified modeling / deviated drill holes correction / volume subdividing / constraint information

References

[1] HouldingS W3D geoscience modeling-computer techniques for geological characterization [M], 1994, New York, Springer: 125-143

[2] ChengD, YangQ, ZhangY-b, JinM-zhong. Three-dimensional geological modeling based on hydro sections [J]. Journal of Beijing University of Aeronautics and Astronautics (BUAA), 2007, 33(11): 1362-1366

[3] RolandB, SiykaZ. 3D spatial relationships model: A useful concept for 3D cadastre [J]. Computer, Environment and Urban Systems, 2003, 27(4): 411-425

[4] WuL-xin. Topological relations embodied in a generalized tri-prism (GTP) model for 3D geosciences modeling system [J]. Computers & Geosciences, 2004, 30(4): 405-418

[5] LiuX-g, ChenG-l, HouW-s, ShangJ-ga. 3D complex geological entity modeling method based on line-frame model [J]. China University of Geosciences, 2006, 31(5): 668-672

[6] ZhangY, BaiS-wei. An approach of 3D stratum modeling based on tri-prism volume elements [J]. Journal of Image and Graphics, 2001, 6(3): 285-290

[7] LiD-r, LiQ-quan. Study on a hybrid data structure in 3D GIS [J]. Acta Geodaetica et Cartographica Sinica, 1997, 26(2): 128-133

[8] GongJ-y, ChengP-g, WangY-dong. Three-dimensional modeling and application in geological exploration engineering [J]. Computers & Geosciences, 2004, 30(4): 391-404

[9] GongJ-y, ChengP-g, LiuR, LiD-j, LiuS-hua. Study on 3D modeling and visualization in geological exploration engineering [C]. Proceeding ISPRS Commission II Symposium on Integrated Systems for Spatial Data Production, Custodian and Decision Support, 2002133-138

[10] WuL-xin. GTP-based integral real-3D spatial modeling for subsurface engineering and its surrounding geology bodies [J]. Geography and Geo-information Science, 2003, 19(6): 1-6

[11] FisherT R, WalesR Q. Three-dimensional solid modeling of geological objects using non-uniform rational B-splines (NURBS) [C]. TURNER A K. Three Dimensional Modelling with Geoscientific Information Systems, 1991, Dordrecht, Kluwer Academic Publishers: 85-105

[12] ZhongD-hua. Enhanced NURBS modeling and visualization for large 3D geoengineering applications: An example from the Jinping first-level hydropower engineering project, China [J]. Computers & Geosciences, 2006, 32(9): 1270-1282

[13] CalcagnoP, ChilesJ P, CourriouxG, GuillenA. Geological modelling from field data and geological knowledge, Part I: Modelling method coupling 3D potential-field interpolation and geological rules [J]. Physics of the Earth and Planetary Interiors, 2008147-157

[14] LiH, WuM-f, WangY-qin. Research on deviation correction and modeling of geological drilling [C]. Applied Mechanics and Materials. Advances in Civil Engineering II, 2013, Switzerland, Trans Tech Publications: 220-228

[15] LuoZ-q, LuoZ-y, LiuX-m, LiChang. Deposit 3D modeling based on visible interpretation of drillhole information [J]. Journal of Central South University: Science and Technology, 2010, 41(6): 2367-2372