WANG Bin, HE Keqiang, SUN Jianmin. 2005: DETERMINATION OF CRITICAL HEIGHT OF SOIL HOLES OF KARST COLLAPSEmdash|KARST COLLAPSE CASE FROM TANGSHAN PALAESTRA. JOURNAL OF ENGINEERING GEOLOGY, 13(3): 320-324.
    Citation: WANG Bin, HE Keqiang, SUN Jianmin. 2005: DETERMINATION OF CRITICAL HEIGHT OF SOIL HOLES OF KARST COLLAPSEmdash|KARST COLLAPSE CASE FROM TANGSHAN PALAESTRA. JOURNAL OF ENGINEERING GEOLOGY, 13(3): 320-324.

    DETERMINATION OF CRITICAL HEIGHT OF SOIL HOLES OF KARST COLLAPSEmdash|KARST COLLAPSE CASE FROM TANGSHAN PALAESTRA

    • The occurrence and development of soil holes is the base and precondition of karst collapse, while the critical soil-hole is the final phase of its development. Whole process of the karst collapse associated with the soil hole can be divided into two phases in term of time and space: inter-collapse phase and surface-collapse phase. The inter-collapse phase is the developing and enlarging process of soil-hole in overlying soil, and the failure of overlying soil above the soil-hole is similar to the failure of apical plate surrounding rock of underground caverns. Therefore, based on the equilibrium arc theory of ММПротодьяконов, the critical height of limit equilibrium arch of overlying soil, which is the critical height of soil-hole, can be determined. A case study for the karst collapse in Tangshan Palaestra, Hebei Provinces shows a good matching between calculated critical height and observed critical height with an error of 4.3%.
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