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I have two cement slabs right next to each other that were

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constructed inaccurately. They sit...
I have two cement slabs right next to each other that were constructed inaccurately. They sit on soft soil clay and have creep over time the structural repair company wants to put piles along the outer slab and foam under the inner slab. These slabs are only moving laterall. Do I need both systems?
Submitted: 2 years ago.Category: Structural Engineering
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Answered in 8 minutes by:
9/17/2015
Structural Engineer: walkereng, Consultant replied 2 years ago
walkereng
walkereng, Consultant
Category: Structural Engineering
Satisfied Customers: 2,874
Experience: Over 30 years of Structural Engineering experience.
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Can you explain your building details a bit more?

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Structural Engineer: walkereng, Consultant replied 2 years ago

Do you have any pictures you can share with me?

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Customer reply replied 2 years ago
I am unable to send an appropriate picture because the slabs are inside the house and covered with wall to wall carpeting.I want to put piles around the outside of the house in the direction that the slabs are moving but want to make sure that will cover both slabs. They are both moving in the same direction.
Structural Engineer: walkereng, Consultant replied 2 years ago

so they are moving/migrating in a horizontal direction

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Structural Engineer: walkereng, Consultant replied 2 years ago

so they are moving/migrating in a horizontal direction

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Customer reply replied 2 years ago
If the piles go down to bed rock would I need foam injection under the middle pile?
Customer reply replied 2 years ago
Are you still there?
Structural Engineer: walkereng, Consultant replied 2 years ago

Sorry for the delay.

The foam jacking and piles serve different purposes.

The foam jacking will fill any voids under your slab and then possible lift/level your slabs to a certain level.

Then I would assume the piles would be used to retain the slab from moving in the horizontal direction.

I would think the foam jacking would be a reasonable procedure to make sure all possible causes/issues are addressed.

I hope this helps.

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Customer reply replied 2 years ago
I guess what I am asking is can the piles stop the movement of both slabs that are right nest to each other and moving in the same direction? I do not think there are voids under the slabs and I plan to level the slabs later. They are in the middle of my house and I do not to trust lifting them> Thanks
Structural Engineer: walkereng, Consultant replied 2 years ago

They could be designed to resist both of the slabs if one slab is pushing on the other. The only issue I might see is to make sure that the inboard slab pushing on the outboard slab would not crack either slab at the interface between the two.

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