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Hi everybody! I hope someone can help me out. I'm trying to model a leaking sewer pipe and sheet pile wall in modflow and it looks like the choices I've got are either to model the them as drains, or model them as a material with a different permeability. Does anybody know what is the best...

We couldn't extend the test pits deep enough to see where the origin was; we do know they extend through the clay though. They don't pose a problem now, but did since settlement of a structure nearby was observed -- trying to see if lateral soil movement caused by the fracture displacement...

Hi Focht3. Here are some answers to your questions: 1. The site is in New England, groundwater levels are about 15 ft below grade, about 2 feet above the soft clay. 2. About 17 feet of overburden on top of the clay -- wouldn't take much to overcome it. Some more reading I've done mentions...

I said almost vertical when what I should have said is steep - the soft clay was saturated, below the water table.

Thanks Focht. When a test pit was performed near the jet grout wall, almost vertical soilcrete seams were observed within the soft clay. We couldn't go deep enough to see their depth of origin. In jet grouting the high pressures are at the nozzle, by the time you've eroded the soil to the...

Does anybody know how to calculate the stress at which soil hydraulic fracturing takes place? I'm trying to check if jet grouting could have cause fracturing of a soft clay. Thanks.

Thanks for responding! The wall ranges in height from 8 to 15 ft, and backfill soils are mostly medium sand. No freezing, just runoff accumulation during a storm-event. Haven't started on the wall stability evaluation itself, wanted to check if anybody knew about a more proper way to do that...

Hi. I am working on the evaluation of a rock gravity wall and run into this forum. The wall in question was built fairly steep (about 80 deg), and a section failed after a period of heavy rain. I've heard about the ARC design manual and am in the process of obtaining a copy. In the meantime...