| This is case E10, after an initial round of filling. Note the rim of the subsidence. |
| Permafrost subsidence |
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| I started filling it immediately. No initial photo was taken. |
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| The fissure is barely visible at this rim. |
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| An ice-ax can be a helpful diagnostic tool. |
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| Rocks and dirt: a temporary answer? |
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| Repeat as needed. |
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| Compacting the soil is appropriate if possible. I drove my truck all over this. |
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| Before: |
| After |
| Or was it just a bad dream? |
| Below we have shots from Case E14. |
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| This was my first encounter with a subsidence. And it spooked me. It was under my house. |
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| The soil is "light and fluffy," settled a foot below the foundation.. There's nothing supporting that portion of the foundation It looks solid, for now. . . . |
| View beneath sinking arctic entryway. |
| Teltale "hourglass" indentations betray a fissure undermining the street. No wonder the city was using a dynapac ad-nauseum when they upgraded our intersection. Those vibrations may well have exaccerbated this. |
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| I pushed dirt from the top of the mound into the open fissures. |
| Those fissures looked bad. This looked somewhat better. |
| After these photos were taken, my landlord sent in construction workers to jack it up and pour a new slab. Thank goodness that's over. It was like a barn raising. |
| The roots went nowhere. Above, a birch tree was dying. |