The Highway 213-Morton Road Landslide: Slices (XSTABL) and
Infinite Slope (Critical Thickness) Stability Analysis
XSTABL File: MORT3 2-09-99 18:39
******************************************
* X S T A B L *
* *
* Slope Stability Analysis *
* using the *
* Method of Slices *
* *
* Copyright (C) 1992 Ä 96 *
* Interactive Software Designs, Inc. *
* Moscow, ID 83843, U.S.A. *
* *
* All Rights Reserved *
* *
* Ver. 5.200 96 Ä 1265 *
******************************************
Problem Description : HWY213-Morton Rd. Landslide(current)
-----------------------------
SEGMENT BOUNDARY COORDINATES
-----------------------------
4 SURFACE boundary segments
Segment x-left y-left x-right y-right Soil Unit
No. (ft) (ft) (ft) (ft) Below Segment
1 .0 .0 300.0 100.0 2
2 300.0 100.0 1100.0 150.0 1
3 1100.0 150.0 1400.0 200.0 1
4 1400.0 200.0 1500.0 200.0 1
1 SUBSURFACE boundary segments
Segment x-left y-left x-right y-right Soil Unit
No. (ft) (ft) (ft) (ft) Below Segment
1 100.0 35.0 1500.0 35.0 2
--------------------------
ISOTROPIC Soil Parameters
--------------------------
2 Soil unit(s) specified
Soil Unit Weight Cohesion Friction Pore Pressure Water
Unit Moist Sat. Intercept Angle Parameter Constant Surface
No. (pcf) (pcf) (psf) (deg) Ru (psf) No.
1 100.0 130.0 400.0 .00 .000 .0 1
2 120.0 130.0 .0 32.00 .000 .0 1
1 Water surface(s) have been specified
Unit weight of water = 62.40 (pcf)
Water Surface No. 1 specified by 5 coordinate points
**********************************
PHREATIC SURFACE,
**********************************
Point x-water y-water
No. (ft) (ft)
1 .00 .00
2 300.00 90.00
3 1100.00 130.00
4 1400.00 180.00
5 1500.00 180.00
A critical failure surface searching method, using a random
technique for generating CIRCULAR surfaces has been specified.
100 trial surfaces will be generated and analyzed.
10 Surfaces initiate from each of 10 points equally spaced
along the ground surface between x = .0 ft
and x = 150.0 ft
Each surface terminates between x = 1000.0 ft
and x = 1250.0 ft
Unless further limitations were imposed, the minimum elevation
at which a surface extends is y = .0 ft
* * * * * DEFAULT SEGMENT LENGTH SELECTED BY XSTABL * * * * *
18.0 ft line segments define each trial failure surface.
---------------------
ANGULAR RESTRICTIONS
---------------------
The first segment of each failure surface will be inclined
within the angular range defined by :
Lower angular limit := -45.0 degrees
Upper angular limit := (slope angle - 5.0) degrees
Factors of safety have been calculated by the :
* * * * * SIMPLIFIED BISHOP METHOD * * * * *
The most critical circular failure surface
is specified by 53 coordinate points
Point x-surf y-surf
No. (ft) (ft)
1 116.67 38.89
2 134.65 38.21
3 152.64 37.64
4 170.64 37.18
5 188.64 36.83
6 206.63 36.59
7 224.63 36.46
8 242.63 36.43
9 260.63 36.52
10 278.63 36.71
11 296.63 37.01
12 314.63 37.42
13 332.62 37.94
14 350.61 38.57
15 368.59 39.30
16 386.57 40.15
17 404.55 41.10
18 422.52 42.16
19 440.48 43.33
20 458.43 44.61
21 476.38 46.00
22 494.32 47.49
23 512.24 49.09
24 530.16 50.81
25 548.07 52.63
26 565.97 54.55
27 583.85 56.59
28 601.72 58.73
29 619.58 60.99
30 637.43 63.35
31 655.26 65.81
32 673.07 68.39
33 690.87 71.07
34 708.65 73.86
35 726.42 76.76
36 744.17 79.76
37 761.89 82.87
38 779.60 86.09
39 797.29 89.42
40 814.96 92.85
41 832.61 96.39
42 850.24 100.04
43 867.84 103.79
44 885.43 107.65
45 902.98 111.61
46 920.52 115.68
47 938.03 119.86
48 955.51 124.14
49 972.97 128.53
50 990.40 133.02
51 1007.80 137.62
52 1025.18 142.32
53 1039.18 146.20
**** Simplified BISHOP FOS = 1.238 ****
The following is a summary of the TEN most critical surfaces
Problem Description : HWY213-Morton Rd. Landslide(current)
FOS Circle Center Radius Initial Terminal Resisting
(BISHOP) x-coord y-coord x-coord x-coord Moment
(ft) (ft) (ft) (ft) (ft) (ft-lb)
1. 1.238 237.76 3017.09 2980.66 116.67 1039.18 1.808E+09
2. 1.250 342.54 2884.51 2841.04 150.00 1131.71 1.617E+09
3. 1.281 199.77 3933.38 3895.38 116.67 1179.73 2.535E+09
4. 1.286 195.27 4162.74 4124.60 116.67 1247.08 2.792E+09
5. 1.298 -368.47 7098.01 7093.69 50.00 1044.98 4.984E+09
6. 1.314 -1148.10 12772.31 12819.78 16.67 1089.68 1.000E+10
7. 1.315 -274.47 7006.97 6993.08 66.67 1097.79 4.832E+09
8. 1.320 160.43 3450.92 3412.31 116.67 1001.21 1.940E+09
9. 1.326 -787.02 9590.53 9614.48 33.33 1001.29 6.680E+09
10. 1.337 -1795.92 17615.50 17702.98 16.67 1090.42 1.335E+10
* END OF FILE * * *
XSTABL File: MORT31 2-09-99 18:40
******************************************
* X S T A B L *
* *
* Slope Stability Analysis *
* using the *
* Method of Slices *
* *
* Copyright (C) 1992 Ä 96 *
* Interactive Software Designs, Inc. *
* Moscow, ID 83843, U.S.A. *
* *
* All Rights Reserved *
* *
* Ver. 5.200 96 Ä 1265 *
******************************************
Problem Description : HWY213-Morton Rd. Landslide(.10)
-----------------------------
SEGMENT BOUNDARY COORDINATES
-----------------------------
4 SURFACE boundary segments
Segment x-left y-left x-right y-right Soil Unit
No. (ft) (ft) (ft) (ft) Below Segment
1 .0 .0 300.0 100.0 2
2 300.0 100.0 1100.0 150.0 1
3 1100.0 150.0 1400.0 200.0 1
4 1400.0 200.0 1500.0 200.0 1
1 SUBSURFACE boundary segments
Segment x-left y-left x-right y-right Soil Unit
No. (ft) (ft) (ft) (ft) Below Segment
1 100.0 35.0 1500.0 35.0 2
--------------------------
ISOTROPIC Soil Parameters
--------------------------
2 Soil unit(s) specified
Soil Unit Weight Cohesion Friction Pore Pressure Water
Unit Moist Sat. Intercept Angle Parameter Constant Surface
No. (pcf) (pcf) (psf) (deg) Ru (psf) No.
1 100.0 130.0 400.0 .00 .000 .0 1
2 120.0 130.0 .0 32.00 .000 .0 1
1 Water surface(s) have been specified
Unit weight of water = 62.40 (pcf)
Water Surface No. 1 specified by 5 coordinate points
**********************************
PHREATIC SURFACE,
**********************************
Point x-water y-water
No. (ft) (ft)
1 .00 .00
2 300.00 90.00
3 1100.00 130.00
4 1400.00 180.00
5 1500.00 180.00
A horizontal earthquake loading coefficient
of .100 has been assigned
A vertical earthquake loading coefficient
of .000 has been assigned
A critical failure surface searching method, using a random
technique for generating CIRCULAR surfaces has been specified.
100 trial surfaces will be generated and analyzed.
10 Surfaces initiate from each of 10 points equally spaced
along the ground surface between x = .0 ft
and x = 150.0 ft
Each surface terminates between x = 1000.0 ft
and x = 1250.0 ft
Unless further limitations were imposed, the minimum elevation
at which a surface extends is y = .0 ft
* * * * * DEFAULT SEGMENT LENGTH SELECTED BY XSTABL * * * * *
18.0 ft line segments define each trial failure surface.
---------------------
ANGULAR RESTRICTIONS
---------------------
The first segment of each failure surface will be inclined
within the angular range defined by :
Lower angular limit := -45.0 degrees
Upper angular limit := (slope angle - 5.0) degrees
Factors of safety have been calculated by the :
* * * * * SIMPLIFIED BISHOP METHOD * * * * *
The most critical circular failure surface
is specified by 57 coordinate points
Point x-surf y-surf
No. (ft) (ft)
1 150.00 50.00
2 167.96 48.84
3 185.93 47.79
4 203.91 46.85
5 221.89 46.03
6 239.87 45.32
7 257.87 44.73
8 275.86 44.25
9 293.85 43.89
10 311.85 43.63
11 329.85 43.50
12 347.85 43.47
13 365.85 43.56
14 383.85 43.77
15 401.85 44.09
16 419.84 44.52
17 437.83 45.07
18 455.82 45.73
19 473.81 46.50
20 491.78 47.39
21 509.76 48.39
22 527.72 49.51
23 545.68 50.74
24 563.63 52.08
25 581.57 53.54
26 599.50 55.11
27 617.42 56.80
28 635.33 58.60
29 653.23 60.51
30 671.12 62.53
31 688.99 64.67
32 706.85 66.92
33 724.69 69.29
34 742.52 71.77
35 760.33 74.36
36 778.13 77.06
37 795.91 79.88
38 813.67 82.81
39 831.41 85.85
40 849.13 89.00
41 866.83 92.27
42 884.51 95.64
43 902.17 99.13
44 919.81 102.74
45 937.42 106.45
46 955.01 110.27
47 972.57 114.21
48 990.11 118.26
49 1007.62 122.42
50 1025.11 126.69
51 1042.57 131.07
52 1060.00 135.56
53 1077.40 140.16
54 1094.77 144.87
55 1112.12 149.69
56 1129.43 154.62
57 1131.71 155.28
**** Simplified BISHOP FOS = .585 ****
The following is a summary of the TEN most critical surfaces
Problem Description : HWY213-Morton Rd. Landslide(.10)
FOS Circle Center Radius Initial Terminal Resisting
(BISHOP) x-coord y-coord x-coord x-coord Moment
(ft) (ft) (ft) (ft) (ft) (ft-lb)
1. .585 342.54 2884.51 2841.04 150.00 1131.71 1.630E+09
2. .618 237.76 3017.09 2980.66 116.67 1039.18 1.809E+09
3. .625 199.77 3933.38 3895.38 116.67 1179.73 2.529E+09
4. .627 195.27 4162.74 4124.60 116.67 1247.08 2.786E+09
5. .636 272.26 3502.55 3454.71 150.00 1118.42 1.885E+09
6. .653 205.28 4211.03 4167.20 133.33 1228.64 2.589E+09
7. .657 184.03 4004.56 3960.44 133.33 1091.33 2.221E+09
8. .667 160.43 3450.92 3412.31 116.67 1001.21 1.931E+09
9. .678 99.33 4964.18 4925.33 116.67 1247.74 3.230E+09
10. .684 198.40 4077.99 4028.28 150.00 1088.47 2.088E+09
* END OF FILE * * *
XSTABL File: MORT32 2-09-99 18:40
******************************************
* X S T A B L *
* *
* Slope Stability Analysis *
* using the *
* Method of Slices *
* *
* Copyright (C) 1992 Ä 96 *
* Interactive Software Designs, Inc. *
* Moscow, ID 83843, U.S.A. *
* *
* All Rights Reserved *
* *
* Ver. 5.200 96 Ä 1265 *
******************************************
Problem Description : HWY213-Morton Rd. Landslide(.15)
-----------------------------
SEGMENT BOUNDARY COORDINATES
-----------------------------
4 SURFACE boundary segments
Segment x-left y-left x-right y-right Soil Unit
No. (ft) (ft) (ft) (ft) Below Segment
1 .0 .0 300.0 100.0 2
2 300.0 100.0 1100.0 150.0 1
3 1100.0 150.0 1400.0 200.0 1
4 1400.0 200.0 1500.0 200.0 1
1 SUBSURFACE boundary segments
Segment x-left y-left x-right y-right Soil Unit
No. (ft) (ft) (ft) (ft) Below Segment
1 100.0 35.0 1500.0 35.0 2
--------------------------
ISOTROPIC Soil Parameters
--------------------------
2 Soil unit(s) specified
Soil Unit Weight Cohesion Friction Pore Pressure Water
Unit Moist Sat. Intercept Angle Parameter Constant Surface
No. (pcf) (pcf) (psf) (deg) Ru (psf) No.
1 100.0 130.0 400.0 .00 .000 .0 1
2 120.0 130.0 .0 32.00 .000 .0 1
1 Water surface(s) have been specified
Unit weight of water = 62.40 (pcf)
Water Surface No. 1 specified by 5 coordinate points
**********************************
PHREATIC SURFACE,
**********************************
Point x-water y-water
No. (ft) (ft)
1 .00 .00
2 300.00 90.00
3 1100.00 130.00
4 1400.00 180.00
5 1500.00 180.00
A horizontal earthquake loading coefficient
of .150 has been assigned
A vertical earthquake loading coefficient
of .000 has been assigned
A critical failure surface searching method, using a random
technique for generating CIRCULAR surfaces has been specified.
100 trial surfaces will be generated and analyzed.
10 Surfaces initiate from each of 10 points equally spaced
along the ground surface between x = .0 ft
and x = 150.0 ft
Each surface terminates between x = 1000.0 ft
and x = 1250.0 ft
Unless further limitations were imposed, the minimum elevation
at which a surface extends is y = .0 ft
* * * * * DEFAULT SEGMENT LENGTH SELECTED BY XSTABL * * * **
18.0 ft line segments define each trial failure surface.
---------------------
ANGULAR RESTRICTIONS
---------------------
The first segment of each failure surface will be inclined
within the angular range defined by :
Lower angular limit := -45.0 degrees
Upper angular limit := (slope angle - 5.0) degrees
Factors of safety have been calculated by the :
* * * * * SIMPLIFIED BISHOP METHOD * * * * *
The most critical circular failure surface
is specified by 57 coordinate points
Point x-surf y-surf
No. (ft) (ft)
1 150.00 50.00
2 167.96 48.84
3 185.93 47.79
4 203.91 46.85
5 221.89 46.03
6 239.87 45.32
7 257.87 44.73
8 275.86 44.25
9 293.85 43.89
10 311.85 43.63
11 329.85 43.50
12 347.85 43.47
13 365.85 43.56
14 383.85 43.77
15 401.85 44.09
16 419.84 44.52
17 437.83 45.07
18 455.82 45.73
19 473.81 46.50
20 491.78 47.39
21 509.76 48.39
22 527.72 49.51
23 545.68 50.74
24 563.63 52.08
25 581.57 53.54
26 599.50 55.11
27 617.42 56.80
28 635.33 58.60
29 653.23 60.51
30 671.12 62.53
31 688.99 64.67
32 706.85 66.92
33 724.69 69.29
34 742.52 71.77
35 760.33 74.36
36 778.13 77.06
37 795.91 79.88
38 813.67 82.81
39 831.41 85.85
40 849.13 89.00
41 866.83 92.27
42 884.51 95.64
43 902.17 99.13
44 919.81 102.74
45 937.42 106.45
46 955.01 110.27
47 972.57 114.21
48 990.11 118.26
49 1007.62 122.42
50 1025.11 126.69
51 1042.57 131.07
52 1060.00