(1. Research Center of Geotechnical and Structural Engineering,Shandong University,Jinan,Shandong 250061,China;
2. State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology, Xuzhou,Jiangsu 221008,China)
Abstract:The deformation mechanism and stability control of surrounding rock are one of the key technologies in tunnel construction. According to the spatial effects of construction behavior on pilot tunnel excavation,the deformation law of surrounding rock in tunnel construction was simulated and comparatively analyzed with full face method and bench tunnel construction method by using the finite difference software FLAC3D. Results show that the displacement rate and the displacement after excavation caused by pilot tunnel construction are smaller than the other two methods,which are beneficial to the stability of surrounding rock. With the increase of buried depth,the displacement increases linearly,whereas the horizontal convergence increases linearly and the crown settlement increases non-linearly with the increase of lateral pressure coefficient. The proportion of the displacement before excavation increases with the increase of the depth,whereas the proportion of the horizontal convergence before excavation increases and the proportion of the crown settlement before excavation decreases with the increase of the lateral pressure coefficient. Combined with the field monitoring data,the reliability of conclusions was verified. The obtained conclusions have certain reference to similar projects,important significance and engineering value.
李利平,李术才,徐邦树,等. 海底隧道施工设计及其数值优化研究[J]. 山东大学学报:工学版,2008,38(4):63-68.(LI Liping,LI Shucai,XU Bangshu,et al. Numerical optimization study on the construction of a sub-sea tunnel[J]. Journal of Shandong University:Engineering Science,2008,38(4):63-68.(in Chinese))
[1]
李术才,赵 岩,李利平,等. 超大断面铁路隧道施工断面综合荷载释放过程研究[J]. 岩土力学,2011,32(9):2 845-2 851.(LI Shucai,ZHAO Yan,LI Liping,et al. Study of construction section comprehensive load releasing process of ultra-large section railway tunnel[J]. Rock and Soil Mechanics,2011,32(9):2 845-2 851.(in Chinese))
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