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The 3rd ISPRS Workshop on Dynamic and Multi-Dimensional GIS & the 10th Annual Conference of CPGIS on Geoinformatics
Chen, Jun

ISPRS, Vol.34, Part 2W2, “Dynamic and Multi-Dimensional GIS”, Bangkok, May 23-25, 2001
FEM software (FLAC-3D) and two typical 2D FEM software
(FLAC-2D, RFPA) are selected for example study now in
CUMTB. With the transferring module the space division
information and rock features contained in the output file of
LYNX could be used for the data source of FLAC and RFPA at
present time.
The typical 2D profile and 3D space division of LYNX are shown
in figure 3 and figure 4. Figure 5 shows a case model of RFPA
for tunnel engineering influence analysis.
Fig.3 2D profile model of LYNX
Fig.4 3D space division of LYNX
Fig.5 Tunnel engineering of RFPA
Generally, the data files of 3DGM and FEM for space division
and attribute description are comprised of three parts: user
identification information, coordinate information and attribute
4.1 The files format of microLYNX
The 2D profile data of microLYNX are stored in ".Per files. It
records the geometry information of the polygons of geological
body in binary system, and could be transferred into *.Txt files.
The data of points could be obtained from the *.Txt file, and the
information include:
Point number,
x, y, z,
user ID for polygon,
and point type.
The 3D raster data of microLYNX are stored in *.Mdb files in
Access. This File contains both tables for grid definition and
grid-body element definition. The grid definition table contains
the identifing code and type of the model, the size definition of
the body element, the origin of the local coordination system,
and the numbers of body elements along each axis. The
gird-body element definition table contains row number, column
number, layer number, element attributes, etc.
4.2 The file format of FLAC
The FLAC-3D applies cubic, rectangles and TEN for the space
division, and the raster data are stored in *.DAT files. The file is
comprised of two parts: geo-boundary and grid definition,
mechanical parameter definition.
For example, the geo-boundary definition of a case is as: attach
face range x=0, 400 y^0,250 z^8.5, 9.5.
The grid definition for the model’s size and elements numbers
along each axis are as following:
gen zone brick size 40 25 1 P0 0, 0, 0 P1 400, 0, 0 P2
0,250,0 P3 0,0,9.
And, the mechanical parameters definition of a case is as
ini d 2.76e' 3 range x=0,400 y=0,250 .2=0,9 prop bulk
9.9e 3 cohesion 2.8 shear 7e 3 friction 3.6e’ tension 2.9
dilation 1.1e 1 .
The FLAC-2D chiefly applies rectangles for the grid division. Its
file is comprised of the grid definition and the boundary
For example, the definition of rectangle grids is as:
grid 400, 240; mode e;
gen -64, -24 -64,24 -56 24 -8, -24 M, 101 j=