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Sudden Long-term Settlement of foundations 2.0

Sudden Long-term Settlement of foundations 2.0

Sudden Long-term Settlement of foundations 2.0

(OP)
Previously we had a lot of productive input form the eng-tips respondents in relation to
thread256-266820: Sudden Long-term Settlement of foundations, recently have engaged with our sewer and water provider and have obtained CCTV footage of the sewer line which shows extensive fracturing, damage and root intrusion in the sewer up line from the area affecting our dwelling, the CCTV footage dates from around the middle of the period of failure of the soil in the area affecting our dwelling and was only partially repaired 12 months ago.

The sailent points for consideration in addition to those of the original thread are:

1. While we live in a holiday area a new home [A] with permanent residents was constructed approximately 3-4 years prior to the failure of the soil in the area around the rear of our house.

2. Also there was added an additional load to the sewer infrastructure [more  going in to the sewer] as the block for house [A] at point 1  was subdivided and the  construction of two other larger[more bedrooms, WC's etc] replacement dwellings was undertaken in the same period.

3. during the period of soil failure there was excessive exuberant plant growth in the area above the sewer line and pit inside and adjacent to the area of soil that has failed, this was during the whole recent drought period in southern Victoria Australia.

4. Over the tlast decade+ there have been numerous brakes and leaks in the sewer line on and around the property where the recent failure has occurred.

We believe that the leaking from the sewer line caused the soil to saturate allowing the foundations to move.

And any further thoughts would be greatly appreciated.

thread256-266820: Sudden Long-term Settlement of foundations

RE: Sudden Long-term Settlement of foundations 2.0

CEFDESIGN...I remember your original thread.  I think it is time for you to engage a local geotechnical engineer.  We could play "what if" here in these posts forever..with no real result.

I'm quite sure the issue is related to the soil type and its moisture reactivity...inundation due to the leaky storm sewers might be a source, but then the building in the area has reduced the pervious area, so site stormwater management might well be a contributing factor.

Good luck.

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