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RETAINING WALL DESIGN WITH BUTTRESSES
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vikram.jeet
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PostPosted: Wed Nov 17, 2010 10:23 am    Post subject: RETAINING WALL DESIGN WITH BUTTRESSES Reply with quote

Heel -less Retaining wall

Retaining wall is stable against Overturning as well as Sliding mostly due
to weight of very earth (over heel ) which causes lateral earth pressure on it

However in Heel- less wall , the self weight of base slab as well as stem
would be the only loads to stabilise it from OT.The Toe needs to be adequate
in this regard.
However SLIDING is main problem in such walls and there will be need for
shear key in the ground ,preferably ,an extension of stem downwards.

The design of stem in conjunction with front buttresses will economize the
reinforcement requirements appreciably.

But sliding needs to be tackled.

best regards

vikramjeet


Hi,
I need help to design a retaining wall of 13m height without heel due to site problem with buttresses on toe side. any book for referance.

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ibarua
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PostPosted: Thu Nov 18, 2010 8:57 am    Post subject: RETAINING WALL DESIGN WITH BUTTRESSES Reply with quote

18th Nov 2010

1. Reference: 'Foundation Analysis & Design (5th ed.)' by J.E. Bowles [McGraw Hill].

2. Walls with buttresses or counterforts are rarely used now. The use of counterforts will not improve the stability of the wall very much.

3. The heel is the back of the wall, on the side of the retained earth; the toe is on the other side. The wall tends to rotate (overturn) about the toe. I have not come across any wall where a heel is not possible. On the other hand, sometimes, a toe is not possible if the retaining wall is located along the boundary of the plot and because the owner of the adjoining plot does not allow any trespass or construction by a neighbour on his land, which is usually the case.

Indrajit Barua.

On Wed, 17 Nov 2010 16:40:38 +0530 "vikram.jeet"  wrote
Quote:
     Heel -less Retaining wall

Retaining wall is stable against Overturning as well as Sliding mostly due
to weight of very earth (over heel ) which causes lateral earth pressure on it

However in Heel- less wall , the self weight of base slab as well as stem
would be the only loads to stabilise it from OT.The Toe needs to be adequate
in this regard.
However SLIDING is main problem in such walls and there will be need for
shear key in the ground ,preferably ,an extension of stem downwards.

The design of stem in conjunction with front buttresses will economize the
reinforcement requirements appreciably.

But sliding needs to be tackled.

best regards

vikramjeet


Hi,
I need help to design a retaining wall of 13m height without heel due to site problem with buttresses on toe side. any book for referance.

-- ­­
     





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umeshrao
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PostPosted: Thu Nov 18, 2010 12:23 pm    Post subject: Re: RETAINING WALL DESIGN WITH BUTTRESSES Reply with quote

vikram.jeet wrote:
Heel -less Retaining wall
Hi,
I need help to design a retaining wall of 13m height without heel due to site problem with buttresses on toe side. any book for reference.
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       Dear Vikramjeet,
     Depending upon the situation whether soil is excavated in the front or filled at back, heel-less retaining wall structural system needs to get evolved.
      Two possible methods are :
      1--- If filled then earth reinforced or if cut then earth nailing technology. we have done reinforced earth upto 12 to 15M quite some time back. Nailing has been used upto 3 basement depth.Where as nailing is very expensive, earth reinforced is economical.  
       2--- Using combination of sheet pile and dead man concept, it is possible to have heel less retaining wall. If the earth filling/retained is in self property then dead man is possible, but neighbour's earth level is higher than the dead man concept is not possible.
       as rightly pointed out if sliding is taken care of by passive earth pressure   buttress may use be used to reduce slab thickness and provide beams perpendicular at the bottom of buttress in self property and provide slab at distance away from buttress with the gap. By this getting high stabilizing moment is feasible but since vertical load is less shear needs to be addressed.
       Regards Umesh Rao
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ibarua
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PostPosted: Tue Nov 23, 2010 6:48 am    Post subject: RETAINING WALL DESIGN WITH BUTTRESSES Reply with quote

23rd Nov 2010

I find it difficult to imagine a retaining wall 13 m. high without a heel.

The optimum solution may be a Reinforced Earth (RE) Wall. For details contact <www.ztech-india.com>. They can design and construct RE walls. Their H.O. is in Delhi.

Buttressed or counterfort walls are out of fashion these days owing to their high cost.

Indrajit Barua

On Sat, 20 Nov 2010 19:47:50 , "umeshrao" <forum@sefindia.org> wrote
            vikram.jeet wrote:                Heel -less Retaining wall
Hi,
I need help to design a retaining wall of 13m height without heel due to site problem with buttresses on toe side. any book for reference.
     
      Dear Vikramjeet,
     Depending upon the situation whether soil is excavated in the front or filled at back, heel-less retaining wall structural system needs to get evolved.
      Two possible methods are :
      1--- If filled then earth reinforced or if cut then earth nailing technology. we have done reinforced earth upto 12 to 15M quite some time back. Nailing has been used upto 3 basement depth.Where as nailing is very expensive, earth reinforced is economical.
      2--- Using combination of sheet pile and dead man concept, it is possible to have heel less retaining wall. If the earth filling/retained is in self property then dead man is possible, but neighbour's earth level is higher than the dead man concept is not possible.
      as rightly pointed out if sliding is taken care of by passive earth pressure buttress may use be used to reduce slab thickness and provide beams perpendicular at the bottom of buttress in self property and provide slab at distance away from buttress with the gap. By this getting high stabilizing moment is feasible but since vertical load is less shear needs to be addressed.
      Regards Umesh Rao

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Abishek_Siingh
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PostPosted: Wed Nov 24, 2010 6:00 am    Post subject: Reply with quote

Mr. Vikramjeet,

Hi,

Have you checked out the possibility of taking anchors originating from the retaining wall and embedding them properly on the "soil" side. Well, this is subjected to various favourable site conditions.

rgds

KAS
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raghuveerks
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PostPosted: Wed Nov 24, 2010 8:06 am    Post subject: About soil parameters Reply with quote

Hi,

Please provide full information about type of soil. because design is based on the soil parameters. if the Strata is rock then we can go for shear connectors at the base. As the passive pressure coefficient is inverse of active pressure coefficient,by going some more depth & considering passive pressure coefficient you may get a solution.

regards
Raghuveer
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PostPosted: Wed Nov 24, 2010 8:09 am    Post subject: What kind of structure you are designing? Reply with quote

Hi,

Waht structure you are designing? s it for stone crushing unit?
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vikram.jeet
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PostPosted: Mon Nov 29, 2010 5:26 am    Post subject: RETAINING WALL DESIGN WITH BUTTRESSES Reply with quote

Dear Er Singh  

This querry originated from some sefi member to whom my reply was as under:

Heel -less Retaining wall

Retaining wall is stable against Overturning as well as Sliding mostly due
to weight of very earth (over heel ) which causes lateral earth pressure on it

However in Heel- less wall , the self weight of base slab as well as stem
would be the only loads to stabilise it from OT.The Toe needs to be adequate
in this regard.
However SLIDING is main problem in such walls and there will be need for
shear key
in the ground ,preferably ,an extension of stem downwards.

The design of stem in conjunction with front buttresses will economize the
reinforcement requirements appreciably.

But sliding needs to be tackled.

best regards

vikramjeet

Qerry from sefi member:
Hi,
I need help to design a retaining wall of 13m height without heel due to site problem with buttresses on toe side. any book for referance.  



I also request him to furnish details of project as asked by some sefi members.  
regards
vikramjeet


Mr. Vikramjeet,

Hi,

Have you checked out the possibility of taking anchors originating from the retaining wall and embedding them properly on the "soil" side. Well, this is subjected to various favourable site conditions.

rgds

KAS

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john_jeevan
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PostPosted: Sat Jun 16, 2018 5:26 am    Post subject: Design of buttress Reply with quote

What all forces we need to consider during the design of buttress in a buttress retaining wall which governs the steel and size requirement of buttresses.
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umeshrao
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PostPosted: Sat Jun 16, 2018 7:03 am    Post subject: Re: Design of buttress Reply with quote

john_jeevan wrote:
What all forces we need to consider during the design of buttress in a buttress retaining wall which governs the steel and size requirement of buttresses.

Dear Mr. John,
Buttress are in front of the wall and earth on the rear of wall. Hence , Buttress will have compression on face away from earth and tension on earth side of stem along with shear.design as beam.
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