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Abstract In the soft soil areas，bursting induced by confined water is the most important factor which affects the safety and stability of deep foundation pit，and is the key technological problem of design and construction which is urgently solved. The influence of different impermeable layer types，pile types and the layouts of piles on the bursting stability and failure modes of foundation pit are studied systematically by centrifugal model test. The test results show that the failure modes of foundation pits bursting in soft soil areas can be mainly divided into three kinds，i.e. water and sand inrushing in contact surface between soil and underground structures，overall heaving failure and sand boiling on impermeable layer surface. Based on theoretical analysis，the internal mechanisms of bursting in foundation pits are cleared respectively that the contact surface between impermeable-layer and underground structures occurs hydraulic fracturing，contact surface or nearby occurs shear failure and impermeable layer occurs complex tensile-shear failure and shear failure.
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Received: 23 April 2010
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2010, Vol. 29 
