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Retaining Wall

The document from the Chief Engineer/Construction discusses issues with the retaining wall drawings for ROB 290, providing 10 preliminary remarks to be addressed such as optimizing the size of the stem and base slab, properly considering the angle of the pressure face and wall friction in calculations, and ensuring pressures and surcharges are calculated separately.

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Praveen Cyssan
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107 views1 page

Retaining Wall

The document from the Chief Engineer/Construction discusses issues with the retaining wall drawings for ROB 290, providing 10 preliminary remarks to be addressed such as optimizing the size of the stem and base slab, properly considering the angle of the pressure face and wall friction in calculations, and ensuring pressures and surcharges are calculated separately.

Uploaded by

Praveen Cyssan
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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SOUTHERN RAILWAY

Office of the
Chief Engineer/Construction,
Ernakulam Jn.
W.352 /I/CN/ERS/ROB 290/design Date: 29-06-2015.

Dy.CE/I/CN/ERS

Sub: ROB 290 at km58/900-59/000. Exg. 1 x 25150 span


RCC slab. Prop. 1 x 40000SK (24626SQ) clear span bow
string superstructure and 1 x 11550 SQ(18760SK) clear
span PSC solid slab between Ettumanoor and Kottayam –
Issues in Retaining wall drawing – reg.

Ref: Consultant let No MCS/CN/ERS/ROB no 290 dt


………………….16-06-15
******************************
With reference to the above, the following
Preliminary remarks to be rectified for further processing.

1. The minimum dimension required in the stem tip at the top is 200mm
instead 300mm. Hence provide 200mm. (cover in stem shall be 50mm)

2. The Base slab width to toe width shall be in the ratio 3:1.

3. The angle made by the pressure face with horizontal is not
considered in the calculation of co-efficient of active earth pressure.

4. The value of wall friction  shall be taken as 2/3 angle of repose 

5. In the stability analysis (sliding), Pressures to be considered up to the


bottom of footing in addition with surcharge load case to be considered.

6. Stem reinforcement shall be curtailed to 50% beyond its required


height.

7. The pressure on soil shall be in the range of 15 to 20 t/m2, shall be


tabulated with respect to the height.

8. It’s been a standard drawing for the road approaches, the size of stem
and base slab shall be optimized.

9. Earth pressure and surcharge shall be calculated separately, as the


lever arms are different for the 2 cases.

10. In the calculation of base pressure, the weight of surcharge is not


taken into account.

XEN/P&D/CN/ERS
For CE/CN/ERS

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