Analysis on the Characteristics of Displacement Field Distribution around the Deep Buried and Great Complex Section Tunnel

Abstract:

Taken the excavation of TBM assembly underground chamber with deeply buried super large and complex section in Jinping Ⅱ Hydropower Station as the background, apply theoretical analysis and experimental method to study the rock deformation and displacement analysis. The result shows that, drilling and blasting method is used for construction which is divided into four layers from top to bottom according to the excavation, they are 8.5m, 5.5m, 6.0m,7.0m from top to bottom, respectively. the displacement of surrounding rock generally moves toward the direction of the free surface. The rock possesses spring back deformation pointing to internal underground chamber. The displacements of arch crown and floor are mainly vertical, and displacement of retaining wall is mainly horizontal. This is significantly different from the rock deformation of underground chamber under general stress after excavation. The chamber displacement distribution under high crustal stress is closely related to stress direction. Location axis of underground chamber should parallel the direction of maximum principal stress. Under the complex and great deeply buried condition, excavation of large section tunnel by digging from the top layer can better release the rock stress, and the rock displacement changes gently, which is conducive to rock mass stability and structure security.

• Periodical: Advanced Materials Research (Volumes 446-449)
• Pages: 2251-2255
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.446-449.2251
• Online since: January 2012
• Authors: Sheng Xiang Lei, Bo Gao, Qing Hua Xiao
• Keywords: Deeply Buried, Displacement Field, Distribution Characteristics, Hydraulic Tunnel, Super Large Section

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