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Abstract In order to study the three-dimensional(3D) deformation feature of special movement joint and the deformation failure model of sectional horseshoe-shaped tunnel lining structure crossing the ground fissure with 40°，the sectional horseshoe-shaped tunnel lining structure modelling experiment crossing the ground fissure with 40° is designed，which is based on the Xi¢an metro tunnel engineering and the geological environment of Xi¢an ground fissure and similarity theory. The soil settlements on the top of model，the bottom soil pressure and the 3D deformation character of the movement joint show that the deformation and damage mode of lining structure of sectional horseshoe-shaped tunnel crossing the ground fissure with 40° are shearing failure alone the movement joint in global. The deformations of movement joint include vertical dislocation，axial tension and horizontal offset，but the lining structure concrete is not damaged. The 3D deformation component of movement joint on lining structure crown is larger than that on lining structure soffit，and the distribution rule of deformations both on crown and soffit is the same. The vertical dislocation of hanging side is larger than that of lying side，but the difference of axial tension between hanging side and lying side is small；and the horizontal offset occurs on the ground fissure mainly. According to the similarity theory，when the settlement of hanging side of ground fissure is up to 90 cm，the total vertical dislocation of five movement joints will be up to 72 cm；and the total axial tension will be up to 34.5 cm；the maximum horizontal offset will be up to 32 cm.
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Received: 20 March 2009
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