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Abstract The excavation of foundation pit has influence on the adjacent tunnel. This study is mainly concerned with the soft soil layer，but less research has been done on the soil rock layer. According to the rock deep excavation at the depth of 30 m adjacent to the tunnel in Linjiangmen，Chongqing，the main monitored results combined with numerical simulation are analyzed. The results show that the deformation of deep excavation is small. The retaining pile and reserve rock wall is an effective support system. The main deformation of supporting structures concentrates in soil strata in rocky area. When the foundation pit is adjacent to a tunnel，the bending moment of retaining pile corresponding to the arch ring is larger than that when there is no tunnel，but it corresponding to the wall section is smaller than that when there is no tunnel. Due to the influence of the continuous media and tunnel geometric shape，the tunnel will change the direction of the displacement field. The vertical displacement is larger than the horizontal displacement，the lateral deformation will appear. The bending moment of tunnel vault，left arch springing and left wall has a bigger increase. The tunnel has obvious bias effect.
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Received: 11 April 2012
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2012, Vol. 31 
