Although; over-saturation of pore-water has been known as potential stress agent, there hasn't been attention to subgrades behavior under extreme dry state. For improved design and construction to mitigate cracks, the two extreme states were considered at Cargo Airport site around fractured Abakaliki anticlinoria, Nigeria. Dynamic tests (remote sensing, electrical-resistivity) and static tests (Atterberg limit, Standard Penetration, Dynamic Cone Penetrometer) produced results that formed basis of modeled solutions, and revealed potential shear planes. Such planes typically reflected low friction angle between 11 degrees and 13 degrees, as well as cohesion ranging from 13 to 23 kPa; indicating isolated silty clay with Plasticity index (PI) = 1.5, and verified through stress-curves behavior in response to pore-pressure status. Such responses created various spaces between the curves. Comparing the space relations in ratios showed novel mathematical demonstration for pavements stability prediction.