6,1975) 
  
41977) 
0 200M 
le 
'ector 
r.26,1975 
ar.29,1977 
ure 
  
  
  
carps 
  
slide line presumed by polygon 1 (method(4), weighted analysis) 
EE RU slide line presumed by polygon 2 (method(4), no-weight analysis) 
— — — — slide line obtained by many boring survey 
    
   
  
ground profile on the line A-A in Fig.12 | 
T 
| 
| 
| 
| 
| 
| 
  
   
     
| 
| 
| 
| 
| 
| 
| 
| 
21 nu : 
eren J 
m head boundary point 
given by clear scarp 
  
  
  
  
tracking point and 
projected vector 
  
  
  
7 
© 
I 
| 
I 
  
50 100 150 200M 
  
  
toe boundary point given by bulged road | 0 
Fig.10 Shape of Underground Slide Surface Analyzed by Polygonal Curve Fitting (Method 4) 
  
  
  
cross-sectional shape of presumed slide surface (method(7), weighted analysis) 
scereetarenenen te? -cross-sectional shape of presumed slide surface (method(7), no-weight analysis) 
— — — — slide line obtained by many boring survey 
  
group(3) | 
  
group(2) 
group(1) 
  
slide surface equation : 
H = AX*^-BXY--CY^-DX4EY--F 
parameters of surface equation 
  
    
  
  
  
  
  
   
group A B C D E F 
  
(1) | 3.545E-3 |-1.569E-3 | 2.506E-4 | -3.803 | 1.141 | 1799.101 
  
(2) | 4.269E-3 | -8.558E-4 | -5.139E-4 | -4.351 | 0.479 | 1861.839 
  
  
  
  
  
  
  
  
0 50 100 150 __200M (3) | 3.915E-3 | 5.492E-4 | 1.273E-3 | -3.569 | 0.980 | 1760.820 
  
  
  
  
  
Fig.11 Cross-section of 3D Slide Surface Obtained by Combination of Many Surfaces (Method 7) 
  
  
> 0%" toe bulg 
= Za iil 
A boundary point 
      
ut «scarp, fissure 
~~ — — presumed boundary 
  
  
  
  
weight of tracking point 
  
  
  
  
  
    
  
e aT 4 B $ 
| NEM RN (7 150 200M o. 1 M87 | [| t 1] 
\ \ 
i 
ri rd 
Fig.12 Weight of Tracking Points Used in Analysis / Presumption of Landslide Boundary Line 
193