3D geologic modeling method based on T splines

Abstract

The invention discloses a 3D geologic modeling method based on T splines. The T splines serve as a spatial data structure of 3D geologic modeling, 3D modeling is carried out aimed at a complex form of a geologic object, and the complexity of geologic construction is described quantitatively. The method comprises the following steps that geologic data of multiple sources is integrated; the construction complexity of the geologic object is analyzed on the basis of the geologic data; geologic objects are divided into two types, and are modeled in a T spline based parameter curved-surface modeling method or a T spline based refined curved-surface modeling method respectively; and the 3D models of the geologic objects are integrated and examined, and a final 3D geologic model is obtained. The method of the invention can be used to establish real-form 3D models including geologic constructions as deposition, wrinkling, intrusion, non-integrated surfaces and tomography, and an accurate reliable initial model is provided for computer-assisted design and value simulation analysis as lithology prediction, seepage and grouting simulation and stability analysis.

Description

technical field [0001] The invention belongs to the field of three-dimensional visualized geological modeling, and relates to three-dimensional visualized modeling of complex geological structures, and specifically relates to a three-dimensional geological modeling method based on T-splines. Background technique [0002] Now 3D geological modeling technology is widely used in the field of geotechnical engineering, and plays an important role in the 3D visualization analysis and decision-making in the fields of foundation engineering, slope engineering and tunnel engineering. The practical application of 3D geological models in GIS, BIM, and CAD / CAE has continuously put forward higher requirements for their accuracy and reliability. However, the existing geological modeling methods still face the challenge of the complexity of geological structures. [0003] Geological structure complexity is an important branch of geological complexity that is concerned by engineering geolog...

AI Technical Summary

Problems solved by technology

The practical application of 3D geological models in GIS, BIM, and CAD / CAE has continuously put forward higher requirements for their accuracy and reliability. However, the existing geological modeling methods still face the challenge of the complexity of geological structures.

However, existing methods still have limitations in terms of complexity quantification, spatial data structures, and modeling techniques

In recent years, some scholars have studied the method of quantitatively measuring the complexity of geological parameters and geometric elements for geological evaluation, but the quantitative indicators of structural complexity that can be used as input parameters for geological modeling still need to be studied

The spatial data structure used in 3D geological modeling determines the underlying structure of the model and the corresponding modeling technology, but the data structure widely used in geological modeling, such as NURBS (Non-Uniform Rational B-spline), due to its mathematical principle The limitation of , usually does not have enough flexibility in describing the complexity of geological structures

Therefore, the NURBS modeling process usually requires NURBS surface clipping and splicing technology. This strategy is suitable for establishing regular geometric forms, but it faces many problems in the modeling of complex geological bodies: First, because the NURBS surface clipping technology calculates the clipping line The algorithm does not change the number and position of the control points of the NURBS surface, so there are no corresponding control points on the clipping line, so it is difficult to control the clipped boundary to fit complex geological data, which limits the geological model Second, since the two trimming lines used for stitching are respectively defined in the parameter domains corresponding to the NURBS surfaces, the real intersection line of the two surfaces is actually approximated by the two trimming lines, resulting in the NURBS patch stitching The position will inevitably produce gaps, which will affect the airtightness of the geological solid model and limit the application of geological modeling in subsequent numerical simulation analysis; thirdly, the multi-surface patches obtained by NURBS cutting and splicing technology may destroy their integrity in the further editing process. Stitching geometric continuity, so the geological model established by this technology is difficult to update with geological data, which limits the development of dynamic geological modeling technology

[0011] At present, T-spline technology is mainly used in organic form modeling in the field of industrial design and computer-aided design in the field of architecture, but has not been introduced into the field of geological modeling

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