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Higher head values in lower layer ?!?


matevz
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hi,

I have designe an excavation, with pumping well and diaphragm. When the calculation finish i get higher head values in a layer 6 that lays beneth layer 5. How is that possible? The diaphragm bottom is in the boreder between layer 5 and 6. Is taht tha case why this happens? I have attached an image so you can imagine what i mean. When i select a cell and check in the cross section (direction i or j) i see a "normal" water table. Is that the right elevation?

thank you, m

post-163-1210624447_thumb.jpg

Edited by matevz
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  • 2 months later...

The higher head in a layer underlying a dewatered zone is normal, because water flows inwards beneath the base of the diaphragm wall, which stops at the base of layer 5, then upwards towards the dewatered excavation. This is a good example of why at least one layer beneath the cutoff wall should always be included in an HFB model, as the upward gradient can cause heave failure.

Edited by Rob Virtue
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