TEST STUDY OF 3D DEFORMATION FEATURE OF SPECIAL MOVEMENT JOINT OF SECTIONAL HORSESHOE-SHAPED TUNNEL CROSSING GROUND FISSURE
HU Zhiping1，WANG Qiyao1，HUANG Qiangbing2，ZHU Qidong1，LI Anxing1
(1. School of Civil Engineering，Chang¢an University，Xi¢an，Shaanxi 710061，China； 2. School of Geology Engineering and Geomatics，Chang¢an University，Xi¢an，Shaanxi 710054，China)
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.
胡志平，王启耀，黄强兵，朱启东，李安兴. 地裂缝活动下分段式马蹄形隧道特殊变形缝的三维变形特征试验研究[J]. 岩石力学与工程学报, 2009, 28(12): 2475-2481.
HU Zhiping1，WANG Qiyao1，HUANG Qiangbing2，ZHU Qidong1，LI Anxing1. TEST STUDY OF 3D DEFORMATION FEATURE OF SPECIAL MOVEMENT JOINT OF SECTIONAL HORSESHOE-SHAPED TUNNEL CROSSING GROUND FISSURE. , 2009, 28(12): 2475-2481.
