Triangular prism-shaped geological model construction method

A technology of geological model and construction method, applied in 3D modeling, image data processing, instruments, etc., can solve the problems of difficulty in accurate construction of thin strata, difficulty in model realization, and distortion of calculation results, saving valuable time and reducing network costs. The number of cells, the effect of accurate results

Active Publication Date: 2013-08-07
HOHAI UNIV
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Problems solved by technology

However, under the influence of complex geological causes, the geological model of layered distribution often has extremely irregular grids and it is difficult to accurately construct thin strata due to the existence of some key weak strata when performing finite element grid division. It is difficult to realize the model and the calculation results are distorted

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  • Triangular prism-shaped geological model construction method

Examples

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Embodiment 1

[0028] Example 1: (simple model)

[0029] Step 1 The bottom elevation of a simplified geological model is z0=0m, and its bottom surface area is a rectangle with a length of 100m and a width of 60m. The thick line frame in the rectangular area is the projection of the control range of key weak strata on the bottom surface of the model. Firstly, the bottom surface of the model is divided every 10m A square grid, and then connect its diagonals in turn, then each small square grid can be divided into two triangular grids, and finally the total number of nodes in the bottom area of ​​the model is np0=77, and the total number of triangular grid units npe= 120, such as Figure 4 shown.

[0030] Step 2 Generate the first layer of material according to the bottom surface of the model and the upper boundary surface of the first layer material, set the grid layer spacing dz1=10m, and calculate the maximum layer spacing between the bottom surface of the model and the first layer materi...

Embodiment 2

[0035] Example 2: (complex model)

[0036] A layered complex geological model is divided into three layers, and the deposits on the displaced surface are the control layer, and the outcropping edge of the surface is as Figure 9 , there is a 0.2m thick weak layer at the bottom of the deposit. The modeling steps of applying the present invention are as follows:

[0037] (1) First set the control area of ​​the bottom surface of the model as Figure 9 As shown, the bottom surface of the model is divided into triangular mesh units with different lengths, and the total number of bottom nodes np0=8000 and the total number of triangular units npe=15642 can be obtained. The area divides the bottom surface nodes of the model into three categories: nodes in the key control area, nodes on the border of the key control area, and nodes outside the key control area, so as to facilitate the control generation of weak layers such as Figure 10 shown.

[0038] (2) Formation materials are...

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Abstract

The invention discloses a triangular prism-shaped geological model construction method. The method includes the following steps: (1) a model projection region is set and divided into planar grid units, and nodes in a model bottom control region are divided into nodes inside the control region, nodes outside the control region and nodes on the control boundary; (2) each layer of geological materials are divided into a grid layer, whether the nodes are located on the boundary surface of the materials of the layer is judged, the coordinates of the nodes of the materials of the layer higher than the boundary surface of the layer are vertically moved down to the boundary surface of the materials, the nodes of each layer are numbered, and the control boundary and the region interior are specially processed; (3) triangular prism units k, l, m, k plus np0, 1 plus np0 and m plus np0 are sequentially constructed on virtual nodes corresponding to the ith layer and the i plus 1th layer until the ground surface; (4) real node numbering is carried out on the nodes from the first layer, whether the nodes are superposed with the corresponding nodes of the lower layer is judged, if so, then the nodes are numbered by adopting the corresponding real nodes of the lower layer, or else the nodes are new real nodes; and real node numbering is carried out; (5) the virtual nodes forming the units are replaced by the real nodes, and thereby a geological model is generated.

Description

technical field [0001] The invention relates to a construction method of a triangular prism geological model. Background technique [0002] Numerical simulation technology is an important means of civil engineering mechanical analysis, and geological model construction is the main component of numerical simulation pre-processing. However, under the influence of complex geological causes, the geological model of layered distribution often has extremely irregular grids and it is difficult to accurately construct thin strata due to the existence of some key weak strata when performing finite element grid division. It is difficult to realize the model and the calculation result is distorted. At the same time, because complex layered formations can usually only be divided by tetrahedral grids, its calculation speed and accuracy are far inferior to those of hexahedral and triangular prism grids. Therefore, the optimization model construction method has great engineering applicati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T17/05
Inventor 石崇徐卫亚朱其志王盛年王海礼王秀菊陈凯华张玉龙刘兴宁孙怀昆
Owner HOHAI UNIV
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