Soft soil progressive failure creep constitutive model construction method based on capacity energy theory

The invention discloses a soft soil progressive failure creep constitutive model construction method based on a capacity energy theory, which comprises the following steps: performing a triaxial shear test and a variable load unloading progressive failure test on a collected soft soil sample to obtain dead load creep curves in different stress states, and combining the capacity energy theory based on the dead load creep curves of the soft soil sample to construct a soft soil progressive failure creep constitutive model. And constructing a soft soil progressive failure creep constitutive model. The variable-load unloading progressive failure process designed by the invention better conforms to the characteristic of the whole life cycle of the actual underground engineering excavation construction, and can overcome the defects that field sampling has spatial variability and completely identical soil samples are difficult to obtain; the established progressive failure creep constitutive model provides a new theo