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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
gen-8,-24 -56,24 8,24 56,-24 ¿=101,301 y=1,241
gen 56,-24 8,24 64,24 64,-24 /=301,401 /=1,241.
While, the boundary definition is as:
fixx/=1; fixx^=401; fix y/=1;
apply pres=17.4 /=241 prep cten=2.2e' 3
£>u=2500 s£>=536.
4.3 The file format of RFPA
The 2D-RFPA applies squares for grid division and could input
external *.Txt files. The geometry and mechanical information
described in the data file includes:
1) label information;
2) total number of material zones;
3) total number of points and coordinate pairs;
4) calculation steps;
5) Mechanical parameters: homogeneous degree of
elastic module, even value of elastic module,
homogeneous degree of strength, even value of
strength, homogeneous degree of Poisson ratio, even
value of Poisson ratio, homogeneous degree of
self-weightiness, and even value of self-weightiness.
This paper gives a practical example in coal mine. The data file
of a geological section from LYNX is input as data source to
RFPA for numerical calculation and mining subsidence analysis.
Based on detailed borehole exploration data a fine geological
model was established where a reversed fault with
six-meter-drop distance is of serious importance for the coal
mining under the west district of Pingdingshan City.
The step-by-step numerical analysis for the mining influence is
conducted by RFPA. A typical space image of the mining
influence when the workface is 120m from the fault is shown in
figure 6. Here, the black dots represent for the damaged area
and the white dot represent for the concentration of compression
According to the systematical analysis on the dynamic
stress-strain process of overburden and the action law of the
fault, the safety width of the fault-protection coal pillar was
decided as 80m, which had ever been dangerously design as
50m. With 80m width the coal pillar could ensure the fault not to
move during the whole mining process and guarantee that the
building above the mining area not to be seriously damaged
because of the move of the fault.
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