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Abstract In order to save land and link the existing roads on the banks conveniently，the underwater tunnels with small spacing may be designed to cross the river. During the period of construction of the underwater tunnels with small spacing，the constructing interaction of the twin tunnels is the key factor affecting the stability of the tunnel engineering. Based on the Liuyanghe tunnel which is the underwater small-distance road tunnels by shallow-burying and hidden-digging method，the constructing interaction of the twin tunnels is studied. Firstly，the three-dimensional finite element model is established to analyze the reasonable lagging distance between the twin tunnel excavated faces. Then，the pore water pressure，surrounding rocks pressure，internal force in steel arch and secondary lining，the axial force of anchor，ground surface settlement，crown settlement，convergence and water level are monitored during the period of construction. At last，based on the measured data，the deformation and stress properties of surrounding rocks and supporting system are analyzed；and the mechanical characteristics of constructing interaction between the twin tunnels are also studied. The experiences and conclusions presented can provide design，construction and monitoring references for similar projects.
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Received: 28 January 2010
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2011, Vol. 30 
