|
Run Date: 8/14/97
Time of Run: 1:05pm
Run By: KRM
Input Data Filename: A:SCREW-EX.DAT
Output Data Filename: A:SCREW-EX.OUT
Plotted Output Filename: A:SCREW-EX.PLT
PROBLEM DESCRIPTION
Soil Screw®Retention Wall System Design Example
- Global Stability
BOUNDARY COORDINATES
3 Top Boundaries
3 Total Boundaries
| Boundary
No. |
X-Left
(ft) |
Y-Left
(ft) |
X-Right
(ft) |
Y-Right
(ft) |
Soil
T Below |
| 1 |
.00 |
60.00 |
50.00 |
60.00 |
1 |
| 2 |
50.00 |
60.00 |
50.01 |
83.00 |
1 |
| 3 |
50.01 |
83.00 |
170.00 |
83.00 |
1 |
ISOTROPIC SOIL PARAMETERS
1 Type(s) of Soil
Soil
Type
No. |
Total
Unit Wt.
(pcf) |
Saturated
Unit Wt.
(pcf) |
Cohesion
Intercept
(psf) |
Friction
Angle
(deg) |
Pore
Pressure Param. |
Pressure
Pi
Constant Su
(psf) |
| 1 |
120.0 |
120.0 |
.0 |
30.0 |
.00 |
.0 |
BOUNDARY LOAD(S)
1 Load(s) Specified
Load
No. |
X-Left
(ft) |
X-Right
(ft) |
Intensity
(lb/sqft) |
Deflection
(deg) |
| 1 |
50.01 |
170.00 |
100.0 |
.0 |
NOTE - Intensity is specified as a uniformly distributed
force acting on a horizontally projected surface.
Searching routine will be limited to an area defined
by 2 bound of which the first 0 boundaries will deflect surfaces upward.
| Boundary
No. |
X-Left
(ft) |
Y-Left
(ft) |
X-Right
(ft) |
Y-Right
(ft) |
| 1 |
50.00 |
60.00 |
68.30 |
60.00 |
| 2 |
68.30 |
60.00 |
68.40 |
83.00 |
A critical failure surface searching method, using a
random technique for generating circular surfaces, has be specified.
100 Trial surfaces have been generated.
10 surfaces initiate from eac of 10 points equall space
along the ground surface between x = 5.00 ft. and x = 50.00 ft.
Each surface terminates between x = 70.00 ft. and x
= 140.00 ft.
Unless further limitations were imposed, the minimum
elevation at which a surface extends is Y = .00 ft.
5.00 ft line segments define each trial failure surface.
The factor of safety for the trial failure surface defined
by the coordinates listed below is misleading.
Failur surface defined by 24 coordinate points
| Point
No. |
X-Surf
(ft) |
Y-Surf
(ft) |
| 1 |
15.00 |
60.00 |
| 2 |
19.01 |
57.01 |
| 3 |
23.32 |
54.049 |
| 4 |
27.90 |
52.47 |
| 5 |
32.67 |
50.98 |
| 6 |
37.58 |
50.05 |
| 7 |
42.57 |
49.67 |
| 8 |
47.57 |
49.86 |
| 9 |
52.51 |
50.62 |
| 10 |
86.47 |
45.48 |
| 11 |
91.45 |
45.92 |
| 12 |
96.38 |
46.77 |
| 13 |
101.21 |
48.04 |
| 14 |
105.93 |
49.71 |
| 15 |
110.48 |
51.77 |
| 16 |
114.85 |
54.21 |
| 17 |
118.99 |
57.01 |
| 18 |
122.88 |
60.15 |
| 19 |
126.49 |
63.61 |
| 20 |
129380 |
67.36 |
| 21 |
123.77 |
71.38 |
| 22 |
125.40 |
75.63 |
| 23 |
127.66 |
80.09 |
| 24 |
128.84 |
83.00 |
Factor of Safety for the preceding specified surface
= 1.669
Following are displayed the ten most critical of the
trail failure surfaces examined. They are ordered - most critical first.
** Safety factors are calculated by the Modified Bishop
Method
Failure Surface specified by 15 coordinate points
| Point
No. |
X-Surf
(ft) |
Y-Surf
(ft) |
| 1 |
30.00 |
60.00 |
| 2 |
34.40 |
57.62 |
| 3 |
39.08 |
55.86 |
| 4 |
43.96 |
54.77 |
| 5 |
48.94 |
54.36 |
| 6 |
53.93 |
54.64 |
| 7 |
58.84 |
55.61 |
| 8 |
63.56 |
57.24 |
| 9 |
68.02 |
59.52 |
| 10 |
72.11 |
62.39 |
| 11 |
75.78 |
65.78 |
| 12 |
78.94 |
69.66 |
| 13 |
81.53 |
73.93 |
| 14 |
83.51 |
78.53 |
| 15 |
84.74 |
83.00 |
Circle center at X = 49.4 ; Y = 90.5 and radius,
36.2
*** 1.639 ***
Failur surface specified by 16 coordinate points
| Point
No. |
X-Surf
(ft) |
Y-Surf
(ft) |
| 1 |
25.00 |
60.00 |
| 2 |
28.91 |
56.88 |
| 3 |
33.24 |
54.39 |
| 4 |
37.91 |
52.60 |
| 5 |
42.80 |
51.56 |
| 5 |
42.80 |
51.56 |
| 6 |
48.89 |
51.27 |
| 7 |
52.88 |
51.76 |
| 8 |
57.61 |
53.00 |
| 9 |
62.27 |
54.98 |
| 10 |
99344 |
57.63 |
| 11 |
70.22 |
60.91 |
| 12 |
73.44 |
64.73 |
| 13 |
76.05 |
69.00 |
| 14 |
77.94 |
73.62 |
| 15 |
79.14 |
78.48 |
| 16 |
79.52 |
83.00 |
Circle center at X= 47.1 ; Y = 83.7 and radius, 32.4
*** 1.727 ***
Failur surface specified by 14 coordinate points
| Point
No. |
X-Surf
(ft) |
Y-Surf
(ft) |
| 1 |
65.00 |
60.00 |
| 2 |
39.29 |
57.43 |
| 3 |
43.95 |
55.62 |
| 4 |
48.58 |
54.62 |
| 5 |
53.85 |
54.46 |
| 6 |
58.80 |
55.14 |
| 7 |
63.57 |
56.65 |
| 8 |
68.01 |
58.94 |
| 9 |
72.01 |
61.94 |
| 10 |
75.44 |
65.57 |
| 11 |
78.22 |
69.73 |
| 12 |
80.25 |
74.30 |
| 13 |
81.49 |
79.15 |
| 14 |
81.80 |
83.00 |
Circle center at X= 52.3 ; Y = 84.0 and radius, 29.6
*** 1.762 ***
Failur surface specified by 19 coordinate points
| Point
No. |
X-Surf
(ft) |
Y-Surf
(ft) |
| 1 |
15.00 |
60.00 |
| 2 |
19.01 |
57.01 |
| 3 |
23.32 |
54.49 |
| 4 |
27.90 |
52.47 |
| 5 |
32.67 |
50.98 |
| 6 |
37.58 |
50.05 |
| 7 |
42.57 |
49.67 |
| 8 |
48.58 |
49.86 |
| 9 |
52.51 |
50.62 |
| 10 |
57.33 |
51.93 |
| 11 |
61.98 |
53.77 |
| 12 |
66.39 |
56.13 |
| 13 |
70.50 |
58.98 |
| 14 |
74.27 |
62.27 |
| 15 |
77.64 |
65.96 |
| 16 |
80.56 |
70.01 |
| 17 |
83.02 |
74.37 |
| 18 |
84.96 |
78.98 |
| 19 |
86.14 |
83.00 |
Circle center at X= 43.4 ; Y = 93.8 and radius, 44.1
*** 1.839 ***
Failur surface specified by 20 coordinate points
| Point
No. |
X-Surf
(ft) |
Y-Surf
(ft) |
| 1 |
15.00 |
60.00 |
| 2 |
18.84 |
56.80 |
| 3 |
23.03 |
54.07 |
| 4 |
27.51 |
51.85 |
| 5 |
32.22 |
50.16 |
| 6 |
37.09 |
49.04 |
| 7 |
42.06 |
48.49 |
| 8 |
47.06 |
48.52 |
| 9 |
52.02 |
49.14 |
| 10 |
56.22 |
50.34 |
| 11 |
61.56 |
52.09 |
| 12 |
66.00 |
54.38 |
| 13 |
70.15 |
57.17 |
| 14 |
73.95 |
60.42 |
| 15 |
77.34 |
64.10 |
| 16 |
80.28 |
68.14 |
| 17 |
82.72 |
72.50 |
| 18 |
84.64 |
77.12 |
| 19 |
86.01 |
81.93 |
| 20 |
86.18 |
83.00 |
Circle center at X= 44.3 ; Y = 91.2 and radius, 42.8
*** 1.940 ***
Failur surface specified by 21 coordinate points
| Point
No. |
X-Surf
(ft) |
Y-Surf
(ft) |
| 1 |
10.00 |
60.00 |
| 2 |
13.84 |
56.79 |
| 3 |
18.00 |
54.03 |
| 4 |
22.44 |
51.73 |
| 5 |
27.11 |
49.93 |
| 6 |
31.94 |
48.66 |
| 7 |
36.89 |
47.92 |
| 8 |
41.89 |
47.73 |
| 9 |
46.87 |
48.08 |
| 10 |
51.79 |
48.98 |
| 11 |
56.58 |
50.41 |
| 12 |
61.19 |
52.35 |
| 13 |
65.56 |
54.79 |
| 14 |
69.63 |
57.69 |
| 15 |
73.36 |
61.01 |
| 16 |
76.71 |
64.73 |
| 17 |
79.69 |
68.79 |
| 18 |
82.08 |
73.34 |
| 19 |
84.05 |
77.74 |
| 20 |
85.50 |
82.52 |
| 21 |
85.59 |
83.00 |
Circle center at X= 41.2 ; Y = 93.4 and radius, 45.7
*** 1.968 ***
Failur surface specified by 17 coordinate points
| Point
No. |
X-Surf
(ft) |
Y-Surf
(ft) |
| 1 |
30.00 |
60.00 |
| 2 |
34.09 |
57.12 |
| 3 |
38.53 |
54.82 |
| 4 |
43.24 |
53.14 |
| 5 |
48.12 |
52.11 |
| 6 |
53.12 |
51.75 |
| 7 |
58.11 |
52.07 |
| 8 |
63.01 |
53.05 |
| 9 |
67.73 |
54.69 |
| 10 |
72.19 |
56.95 |
| 11 |
76.31 |
59.79 |
| 12 |
80.00 |
63.16 |
| 13 |
83.21 |
66.99 |
| 14 |
85.87 |
71.23 |
| 15 |
87.93 |
75.78 |
| 16 |
89.36 |
80.57 |
| 17 |
89.74 |
83.00 |
Circle center at X= 53.3 ; Y = 88.7 and radius, 37.0
*** 2.019 ***
Failur surface specified by 23 coordinate points
| Point
No. |
X-Surf
(ft) |
Y-Surf
(ft) |
| 1 |
10.00 |
60.00 |
| 2 |
14.62 |
58.09 |
| 3 |
19.35 |
56.48 |
| 4 |
24.18 |
55.15 |
| 5 |
29.07 |
54.13 |
| 6 |
34.02 |
53.41 |
| 7 |
39.00 |
53.00 |
| 8 |
44.00 |
52.90 |
| 9 |
49.00 |
53.10 |
| 10 |
53.97 |
53.62 |
| 11 |
58.90 |
54.44 |
| 12 |
63.77 |
55.56 |
| 13 |
62.57 |
56.98 |
| 14 |
73.26 |
58.70 |
| 15 |
77.85 |
60.70 |
| 16 |
82.29 |
62.98 |
| 17 |
68.59 |
65.53 |
| 18 |
90.73 |
71.41 |
| 19 |
97.68 |
71.41 |
| 20 |
98.44 |
74.71 |
| 21 |
101.89 |
78.23 |
| 22 |
105.30 |
81.97 |
| 23 |
106.11 |
83.00 |
Circle center at X= 43.2 ; Y = 133.8 and radius,
80.9
*** 2.035 ***
Failur surface specified by 15 coordinate points
| Point
No. |
X-Surf
(ft) |
Y-Surf
(ft) |
| 1 |
35.00 |
60.00 |
| 2 |
39.08 |
57.11 |
| 3 |
43.57 |
54.92 |
| 4 |
48.36 |
53.47 |
| 5 |
53.31 |
52.80 |
| 6 |
58.31 |
52.93 |
| 7 |
63.23 |
53.86 |
| 8 |
67.93 |
55.57 |
| 9 |
72.29 |
58.00 |
| 10 |
76.22 |
61.11 |
| 11 |
79.58 |
64.79 |
| 12 |
82.33 |
68.97 |
| 13 |
64.37 |
73.54 |
| 14 |
85.65 |
78.37 |
| 15 |
86.11 |
83.00 |
Failur surface specified by 19 coordinate points
| Point No. |
X-Surf (ft) |
Y-Surf (ft) |
| 1 |
25.00 |
60.00 |
| 2 |
29.11 |
57.15 |
| 3 |
33.51 |
54.78 |
| 4 |
38.15 |
52.92 |
| 5 |
42.97 |
51.59 |
| 6 |
47.91 |
50.81 |
| 7 |
52.91 |
50.59 |
| 8 |
57.89 |
50.93 |
| 9 |
62.81 |
51.82 |
| 10 |
67.60 |
53.27 |
| 11 |
72.19 |
55.24 |
| 12 |
76.54 |
57.71 |
| 13 |
80.58 |
60.66 |
| 14 |
84.26 |
64.04 |
| 15 |
87.54 |
67.81 |
| 16 |
90.38 |
71.93 |
| 17 |
92.74 |
76.34 |
| 18 |
94.58 |
80.99 |
| 19 |
94.13 |
83.00 |
Circle center at X= 52.4 ; Y = 95.1 and radius, 44.5
*** 2.086 ***
|
