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gyan_th
Progressive Member
Joined: 26 Jan 2003
Posts: 40
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 Posted: Tue Aug 06, 2019 10:15 am Post subject: 9m high retaining wall with limited available base width. |
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Dear All,
I have to design a 9m high retaining wall to retain a hill side at HP. The restriction is the available base width is approx. 4m. The SBC is 160kN/sqmm at 1.5m depth. Even I provide a L-shaped Counterfort Wall
with shear keys, the upward soil pressure is coming in tension with a value of about -83.74kN/sqmm, and so the wall is failing in stability criteria. How do I solve the problem? Any/All suggestions will be highly appreciated.
Thanks in advance.
Gyaneshwar Th.
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praveen_sefindia
SEFI Member
Joined: 21 Jun 2010
Posts: 8
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| Posted: Tue Aug 06, 2019 3:30 pm Post subject: 9m high retaining wall with limited available base width. |
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I had similar one but we had put 0.9m thick tapering retaining wall with more counterweight
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es_jayakumar
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Joined: 24 Nov 2011
Posts: 1408
Location: Cochin
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| Posted: Tue Aug 06, 2019 4:53 pm Post subject: |
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For a 9m tall R/wall, 4m wide base may be insufficient for stability, whether the wall is cantilever or counterfort type, even if shear key is provided. Can you provide under-reamed piles in the heel end ? This will impart stability to the wall against development of tension on soil and overturning. But, there should be ample space to place the tripod for the UR pile. Another method is provision of anchor blocks that mobilize passive earth pressure, connected to the stem top by steel rods embedded in concrete. But, erosion of soil from around the anchor blocks will reduce its efficiency and endanger the wall. Several other modern techniques such as soil nailing, reinforced earth, gabions etc. are there to retain earth. You can refer "Modern Techniques in Geotechnical and Foundation Engineering" by Ninan P Kurian, for details. These should be properly designed for adoption. Gabions can also fail, as shown in the photograph given below, which happened in the Konkan Railway route in the recent rains.
E S Jayakumar
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rojanmathewtsy
General Sponsor
Joined: 21 Apr 2013
Posts: 29
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| Posted: Wed Aug 07, 2019 6:54 am Post subject: Re: 9m high retaining wall with limited available base width. |
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| gyan_th wrote: | Dear All,
I have to design a 9m high retaining wall to retain a hill side at HP. The restriction is the available base width is approx. 4m. The SBC is 160kN/sqmm at 1.5m depth. Even I provide a L-shaped Counterfort Wall
with shear keys, the upward soil pressure is coming in tension with a value of about -83.74kN/sqmm, and so the wall is failing in stability criteria. How do I solve the problem? Any/All suggestions will be highly appreciated.
Thanks in advance.
Gyaneshwar Th. |
To avoid the tension, you have two options.
1. Increase the Thickness of the foundation to counterweight the negative pull.
2. Increase the Depth of footing so that the weight of soil above your retaining base will increase and along with that the passive pressure will also increase. These two factors will counter the tension.
Other wise you can go for the other soil improving technique mentioned by Mr.Jayakumar based on the cost.
Rojan Mathew
mathew.rojan@gmail.com
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gyan_th
Progressive Member
Joined: 26 Jan 2003
Posts: 40
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| Posted: Wed Aug 07, 2019 8:14 am Post subject: |
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Dear All,
Thank You for your valuable suggestion. I will put the options to the clients for discussion. Another query is are there specialist consultants in India if I go for modern techniques? Please provide some contacts.
With Regards,
Gyaneshwar Th.
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es_jayakumar
General Sponsor
Joined: 24 Nov 2011
Posts: 1408
Location: Cochin
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Rajay
General Sponsor
Joined: 01 Jan 2010
Posts: 8
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| Posted: Thu Aug 08, 2019 3:30 am Post subject: 9m high retaining wall with limited available base width. |
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Alternatively, you can provide retaining wall with reliving shelves.
Rajay Balwan
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Trilochan S.Dholakia
SEFI Member
Joined: 12 Oct 2011
Posts: 12
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| Posted: Thu Aug 08, 2019 5:30 am Post subject: 9m high retaining wall with limited available base width. |
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My proposals are :
A. Reinforced earth system with precast cocr. Facial wall OR Gabbion work to environmental friendly.
B. Shelve type RC wall.. another way of counter fort and partition shelves.
In case i can be of help. Please let me know. Thanks ..
T. S. Dholakia
trilochan.dholakia@gmail.com
Sent from my iPhone=
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Amol Gaulkar
SEFI Member
Joined: 31 May 2012
Posts: 2
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| Posted: Thu Aug 08, 2019 12:17 pm Post subject: Re: 9m high retaining wall with limited available base width. |
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| gyan_th wrote: | Dear All,
I have to design a 9m high retaining wall to retain a hill side at HP. The restriction is the available base width is approx. 4m. The SBC is 160kN/sqmm at 1.5m depth. Even I provide a L-shaped Counterfort Wall
with shear keys, the upward soil pressure is coming in tension with a value of about -83.74kN/sqmm, and so the wall is failing in stability criteria. How do I solve the problem? Any/All suggestions will be highly appreciated.
Thanks in advance.
Gyaneshwar Th. |
Dear Er. Gyaneshwar
Kindly recheck SBC units. It must be kN/m2. (160kN/sqmm is not possible.)
Regards
Amol Gaulkar
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B.S.VIRDI
SEFI Member
Joined: 02 Jan 2009
Posts: 5
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| Posted: Tue Aug 13, 2019 6:30 am Post subject: 9m high retaining wall with limited available base width. |
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Seen ur problem , u can use two pile of 6-8m 300 dia to arrest upward forces.
virdi B.S
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