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| FORMATION MECHANISM AND INITIAL CONDITION OF SOIL CAVITY |
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Abstract The formation mechanism and factors affecting of soil cavity are analyzed. It is realized that super- hydrostatic pressure makes the soil block spalled and fissured，and hydrodynamic pressure makes soil fine grain migrated. Both actions induce the enlargement of soil cavity. The initial conditions of soil cavity formation，i. e.，the critical declined magnitude of water level ，critical water flowrate vcr and critical discharge Qcr are formulated.
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Received: 26 November 2001
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