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steel pipe pile under varying subsurface conditions

steel pipe pile under varying subsurface conditions

steel pipe pile under varying subsurface conditions

(OP)
This is for 24" pipe piles with 0.5" thickness filled with concrete as the foundation type retaining walls.   These piles are short and each pile is placed after predrilling hole to the required depth and then the concrete is placed within this steel pipe pile.  It is assumed that the concrete and steel act as one unit.  Under one of the walls, the pipe pile embedment occurs in an approximate 6-foot soft clay layer.  Although the pipe pile lengths are sufficient for the lateral loads, will the soft clay layer cause for settlement problems?  The piles cannot increase in length due to constraints.

RE: steel pipe pile under varying subsurface conditions

Short piles are usually end bearing piles and the bottoms should be driven to a certain depth into a sound layer, otherwise settlement is likely to be a problem.

RE: steel pipe pile under varying subsurface conditions

What is even worse is that these piles supported by soft clay are under one of the walls. Differential settlement is likely to occur if not properly structurally reinforced.

RE: steel pipe pile under varying subsurface conditions

How high is the wall? How deep are the piles? How soft is the clay? Get undisterbed samples, do a U-U test with pore pressure measurements and an oedemeter test. Do a bearing capacity  and settlement analysis. Once you have some information, you can make a determination. Why can't the piles go deeper? That might be the best solution.

RE: steel pipe pile under varying subsurface conditions

And please explain the installation technique.  Are you concerned about damaging a nearby structure?



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RE: steel pipe pile under varying subsurface conditions

Sorry - this is a strange way to install a pipe pile - drill to the depth, drop down a steel pipe, fill with concrete?????  Why not just a drilled shaft???????  I'd say, at first glance, that something is fishy if the depth of the pile is controlled by factors other than technical - else why would you stop the pile in soft clay????

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