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Based on five basic assumptions, using theoretical analysis method, the natureof the ground subsidence and collapse was revealed from the mechanics point.Dividedinto four phases as groundwater level descent, soil cavity formation, soil cavity expansion,and ground collapse emersion, the whole process of ground subsidence and collapse wasanalyzed in detail.The study shows that ground subsidence and collapse is the macroscopicperformance and inevitable result of the soil cavity expansion and development,and the dynamic mechanics is the spalling force induced by the groundwater falling.Theactivities of underground water play a very important role in the process from the formationof soil cavity to the production of ground subsidence.
Based on five basic assumptions, using theoretical analysis method, the nature of the ground subsidence and collapse was revealed from mechanics point. Dualizedinto four phases as groundwater level descent, soil cavity formation, soil cavity expansion, and ground collapse emersion, the whole process of ground subsidence and collapse wasanalyzed in detail. The study shows that ground subsidence and collapse is the macroscopic behavior and inevitable result of the soil cavity expansion and development, and the dynamic mechanics is the spalling force induced by the groundwater falling. The activities of underground water play a very important role in the process from the formation of soil cavity to the production of ground subsidence.