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Abstract The two-phase saturated soil with air content less than 99.99% and structural response are investigated by experiments，and explosion experiments are conducted by cylindrical simulating explosion device with sizes of f 2.5m×5 m. Mass charges of TNT are adopted and buried in the saturated soil to carry out contact explosion with unified proportional buried depth. Square large-span structures are set in the saturated soil，and overall damage appears for these structures. At the same time，limit structures of complete immobility wall are investigated. By the comparison with large-span structures，reflection factors of different types of structures are systematically researched. Experimental investigation indicates that，if the pressure in the two-phase saturated soil is more than 2 MPa，the dynamic liquefaction appears in the saturated soil，and stress waves are changed into shock waves. The pressure has little relation with specific particle properties of saturated soil. By means of research on two kinds of structural responses at limit state，the result shows that the reflection factor of the structures with different spans in saturated soil is 0.5–2.0，and its value is decided by structural forms.
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Received: 30 July 2008
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