Anchor Spacing Design of Pre-Stressed Tunnel Concrete Lining with Un-Bonded Annular Anchors for Songhua River Water Supply Project

Abstract:

At present, annular anchor pre-stressed tunnel Concrete lining is the main design method of poor -quality surrounding rocks, thin covering and high internal water pressure tunnel. Based on the contact of tendons and concrete, the annular anchor lining can be classified into bonded and un-bonded. Cable spacing is one of the key parameters in the design of the un-bonded annular anchors pre-stressed concrete lining. The optimal anchor spacing can not only meet the demand of the project, but also save the cost of construction. In this paper, the anchor spacing is studied in the design of pre-stressed tunnel concrete lining with un-bonded annular anchors for Songhua River water supply project. The equivalent load method and solid modeling method are combined in Flac^3d 3D modeling. Numerical simulation of pre-stressed effects for different anchor spacing in tension and operation of the concrete lining were analyzed. The optimal anchor cable spacing is received, which is a reference for the design and construction of similar projects in the future.

• Periodical: Key Engineering Materials (Volume 737)
• Pages: 505-510
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.737.505
• Online since: June 2017
• Authors: Jin Pi*, Yu Fei Zhao, Rui Lang Cao, Zhi Xin Jia
• Keywords: Anchor Spacing, Hydraulic Tunnel, Pre-Stressed Tunnel Lining, Un-Bonded Annular Anchors

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