SINKHOLE/SPT BORING LOGS

[HELPDEB]

Hi,
I would be so very thankful if there is someone that would kindly assist me with a few answers to an engineering investigation we had done to our property in reference to sinkholes. We live in Florida and sinkholes are very prevelent in our neighborhood. On one of my boring logs, it showed 13.5 feet of poorly graded sand then a layer of limestone until the depth of 40 feet. Between 40 and 48 feet, the substance symbol was white, showing no material at all, with no recovery. The blow counts at 40 feet were all indicated as WOH values and the N value was indicated as a WOH value as well. At 48 feet there is 1 foot of clay and then once again limestone. We have several signs of settling and shifting movements on our property. They also showed an anomaly from their GPR diagram that is over half the length of our house that stated it had paleosinkhole like conditions. The boring log showed only sandy and loose soils, no clay subsurface, then finally limestone at 68 feet. They also included a diagram in my report of where grout injection points should go, however there was no reference to that diagram in the table of contents. I am confused. If anyone can be of assistance or offer any links I would be so appreciative. My home is still cracking and settling further and I just don't know what to do. Thank you for any and all help.
Deb

 

[GeoPaveTraffic]

First, contact the company that produced the report you are looking at. If you paid for the report and don't understand it they should be willing to talk you through it on the phone for no additional cost. If you still don't understand then try to arrange a meeting with them, which you will likely have to pay for, so they can explain it in person.

Based on my limited knowledge of Florida sinkholes, it sounds like your house is at least partially over an ancient sinkhole that is still moving. The WHO notation on the boring log means Weight of Hammer, 140 pounds. That means that the soil is very soft and is a good indication of sinkhole type material at that depth. I do not know what white symbol means.

Hope this helps.