Journal of Jilin University(Engineering and Technology Edition) ›› 2020, Vol. 50 ›› Issue (2): 631-640.doi: 10.13229/j.cnki.jdxbgxb20181285

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Mechanical analysis of full⁃length anchorage with high pretension post⁃tensioning method

Wen-bin TAO1(),Jun-ling HOU2(),Tie-lin CHEN1,Bin TANG3   

  1. 1.School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China
    2.School of Energy and Safety, Anhui University of Science and Technology, Huainan 232001, China
    3.School of Civil Engineering and Architeture, Anhui University of Science and Technology, Huainan 232001, China
  • Received:2018-12-29 Online:2020-03-01 Published:2020-03-08
  • Contact: Jun-ling HOU E-mail:taowenbin0963@sina.com;13956408171@139.com

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Abstract:

To solve the problems of uneven overall force, low shear bearing capacity and inadaptability to large deformation of anchor bolt in deep roadway supported by lengthened or full-length anchor bolt, a Full-length Anchorage (FLA) support method with High Pretension Post-tensioning (HP-PT) is proposed in this paper. By establishing the mechanical model of FLA support with HP-PT method, the mechanical characteristics and bearing capacity of the anchorage section of FLA support with HP-PT method are calculated and analyzed theoretically, and compared with the traditional lengthened and FLA support method. The results show that the FLA support with HP-PT method has the advantages of both high pretension support and FLA support. Compared with the traditional lengthening and support method, the FLA with HP-PT support method makes the distribution of shear stress more gentle; it is conducive to the diffusion of pre-tightening force in confining pressure, enlarges the range of compressive stress zone of surrounding rock, improves the characteristics of anchored surrounding rock; and using high Pre-tightening Force pallet can form a more effective supporting structure of anchored surrounding rock.

Key words: geotechnical engineering, high preload, full-length anchorage, post tension method, high pre-tightening force pallet, structure of surrounding rock

CLC Number: 

  • TD353

Fig.1

Strengthened anchorage force diagram"

Fig.2

Full-length anchorage force diagram"

Fig.3

Diagram of force on fast resin anchor"

Fig.4

Force diagram of micro-unit"

Fig.5

Schematic diagram of full-length anchorage force with high preloading force"

Fig.6

Shear stress distribution at interface of anchor"

Fig.7

Distribution of bolt axial force"

Fig.8

Traditional ball gasket and high pre-tightening force pallet"

Fig.9

Pre-tightening force conversion curve"

Fig.10

High pre-tightening force pallet assembly sketch"

Fig.11

Roadway roof displacement distribution"

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