Heave Check according to Chinese Standard
This verification depends on the depth of confined aquifer D and height of its confined water level hw to which the water would rise if it was not restricted by aquifuge from above.
Verification is done by using a safety factor approach and follows formulas:
safety factor of stability of the soil against heave
Distance between the top of the confined aquifer and the bottom of foundation pit
Unit weight of the soil layer between the top of confined aquifer and the bottom of foundation pit
Pressure head from the top of confined aquifer
Unit weight of water