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10.0 Slope Stability Analysis

Slope stability analyses were conducted for two trial pit locations near bridge abutments using Geostru Slope software. At km 63/550 with a 5.7m embankment and 2.25:1 side slope, the factor of safety was calculated to be 1.428. At km 135/180 with a 5.05m embankment and 2.0:1 side slope, the factor of safety was 1.434. Both factors of safety exceeded the minimum required of 1.4, indicating the slopes would be stable based on the assumptions of a pore water pressure ratio of 0.25-0.35 and the water table located at either the full height or bottom of the embankments.

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A.K.M Shafiq Mondol
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82 views3 pages

10.0 Slope Stability Analysis

Slope stability analyses were conducted for two trial pit locations near bridge abutments using Geostru Slope software. At km 63/550 with a 5.7m embankment and 2.25:1 side slope, the factor of safety was calculated to be 1.428. At km 135/180 with a 5.05m embankment and 2.0:1 side slope, the factor of safety was 1.434. Both factors of safety exceeded the minimum required of 1.4, indicating the slopes would be stable based on the assumptions of a pore water pressure ratio of 0.25-0.35 and the water table located at either the full height or bottom of the embankments.

Uploaded by

A.K.M Shafiq Mondol
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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10.

0 SLOPE STABILITY ANALYSIS

Slope stability analysis for designing side slope has been carried out with the help of Geostru Slope
software for different trial pit location near the abutment of the bridge. Every bridge there is two
abutment, we consider maximum height with compare the two abutment embankment height.
The following assumptions have been made during analysis:-

i) Pore water pressure ratio (ru) assumed- 0.25 (formation soil) & 0.35 (sub-soil).
ii) Water table height will be full height of embankment.
iii) Water Table height will be at Bottom of Embankment.

With above assumptions at km 63/550, for height of embankment 5.70m and


side slope of 2.25:1, the factor of safety works out to be 1.428 and at km
135/180, height of embankment 5.05m and side slope of 2.0:1, the factor of
safety works out to be 1.434 which is more than minimum required factor of
safety i.e. 1.4 as per Para – 2.1 of Annexure-III of “Guidelines For Earthwork
In Railway Projects”, July 2003, hence safe. Slope stability analysis is attached
as Annexure-I & II, based on Slope-W analysis output sheet
SLOPE SALABILITY CHECK WITH GEO STRU SLOPE: (BARATI BRIDE) SLOPE RATIO 2H: 1V

For Design we following below assumption

 We consider Pi value 15 and from table we found that, Cohesion of soil C= 14.2 Kn/m2

Fig: Slope stability analysis for Barati Bridge Embankment considering water table Top of Embankment.
Fig: Slope stability analysis for Barati Bridge Embankment considering water table Bottom of
Embankment.

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