Build a real cave

Signed-off-by: 刘明宏 <liuminghong@mail.sdu.edu.cn>

karst_cave/curve_16.txt

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+% Model:    Tunnel.mph 
+% Version:  COMSOL 
+% Date:     May 2023 
+% Dimension:      3 
+% Nodes:100 
+% Elements:100 
+% Expressions:     1 
+% Description:        Contour 
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karst_cave/curve_17.txt

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+% Model:    Tunnel.mph 
+% Version:  COMSOL 
+% Date:     May 2023 
+% Dimension:      3 
+% Nodes:100 
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karst_cave/curve_18.txt

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+% Model:    Tunnel.mph 
+% Version:  COMSOL 
+% Date:     May 2023 
+% Dimension:      3 
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karst_cave/curve_19.txt

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karst_cave/curve_20.txt

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karst_cave/curve_21.txt

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karst_cave/curve_22.txt

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karst_cave/curve_23.txt

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karst_cave/curve_24.txt

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karst_cave/curve_25.txt

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karst_cave/curve_26.txt

@@ -0,0 +1,210 @@
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karst_cave/curve_27.txt

@@ -0,0 +1,210 @@
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karst_cave/curve_28.txt

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karst_cave/curve_29.txt

@@ -0,0 +1,210 @@
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karst_cave/curve_30.txt

@@ -0,0 +1,210 @@
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