This is the exact reason why we go the extra mile to put in the geotextile under our patios and walkways. The lot was still empty next door when we finished the project. Later this summer they started the construction next door. They dug the foundation, making sure that they dug RIGHT next to our fence and our clients finished yard even though they have 4 feet to the new basement. Well as you can expect, the hole gets larger as they weren’t very timely in backfilling the hole. Some rains came and the hole got even larger. The fence stood there, with a post in the air and the earth fell away from our clients yard.
Well… the hole STOPPED falling where we have engineered our pathway. This is probably the reason it didn’t get MUCH larger. The geotextile fabric at the bottom of our constructed base knits the entire path together into a unit that is VERY hard to remove or undermine. We will have to replace this portion of the pathway as the ground below has sunk a bit, but as you can see the bricks and the constructed base have performed amazingly in staying together as a unit! What a unique perspective at our over engineered patio!
Notice the fabric at the bottom of the gravel, right where the cavitation stopped? The base is almost vertical from the fabric to the paver edge. incredible! 
EVEN in one spot where the base did undermine a bit, the path structure is still solid! At this point, I am told they had the bucket of the excavator, pretty much UNDER the fence.
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