Tips for using ROSA concrete footings in slopes.
When installing footings in slopes, the load-bearing capacity of these foundations decreases and depends, among others, on the distance of the footing installation in the slope and the slope angle. Typical footings produced by ROSA can be used on slopes provided that several conditions are met to ensure its stability.
OPTION I - Using concrete footings in slopes without modifications
In tab. 1. approximate values of the minimum distance x of the footing from the front of the slope are given, depending on the inclination angle of the slope with a height Hs greater than ½ of the footing’s height Hp.
|
Concrete footing type |
Footing’s Ms |
Column’s Mg max |
Distance of the footing from the edge of the slope „x” [mm] |
|||||
|
0 |
100 |
200 |
300 |
400 |
500 |
|||
|
Maximum slope angle |
||||||||
|
B-60 |
12 |
5,6 |
10 |
20 |
30 |
40 |
45 |
55 |
|
B-71 |
14 |
9 |
10 |
20 |
30 |
37 |
45 |
55 |
|
B-70 |
20 |
16 |
10 |
25 |
30 |
40 |
55 |
60 |
|
B-80 |
32 |
28 |
10 |
25 |
30 |
40 |
55 |
60 |
Table 1.
Max. slope angle depending on the footing’s distance from the face of the slope X calculated for soil with a minimum load-bearing capacity of 0.2 MPa
Max. slope angle depending on the footing’s distance from the face of the slope X calculated for soil with a minimum load-bearing capacity of 0.2 MPa
OPTION II - Using foundations in slopes in combination with retaining plates
If we do not meet the criteria of OPTION I, it is proposed to use retaining plates to increase the load-bearing capacity according to the diagram below. The use of plates and their size is the responsibility of the authorised construction designer, who will consider not only the location of the footing, but also the type of soil.
