Natural sinkholes generally form when heavy, water-saturated soil causes the roof of an underground limestone cavity to collapse, or when water widens a natural fracture in limestone bedrock.
The main factors influencing the gas preservation condition includes the fault amplitude, fault fragmented intervals, fault surface dip, and the position of fracturecavity system in the faulted zone.
The result suggests that the cavity beneath cement concrete pavement slabs and the vehicle overloading are the important factors in incipient fracture of cement concrete pavement slabs.