›› 2016, Vol. 37 ›› Issue (8): 2359-2365.doi: 10.16285/j.rsm.2016.08.031

• Geotechnical Engineering • Previous Articles     Next Articles

Analysis of mechanical characteristic and optimization of initial tensile tonnage of prestressed anchor cable

DENG Jian1, 2, XIAO Ming1, 2, XIE Bing-bing1, 2   

  1. 1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, Hubei 430072, China; 2. Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education, Wuhan University, Wuhan, Hubei 430072, China
  • Received:2014-10-08 Online:2016-08-11 Published:2018-06-09
  • Supported by:

    This work was supported by the Major Research Plan of National Natural Science Foundation of China (91215301), the National Natural Science Foundation of China (51279136) and the National Natural Science Foundation for Youth of China (51209164).

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Abstract: Based on the role of prestressed anchor and the mechanical transmission mechanism of anchorage interface, an anchorage interface stress model is developed. Then an analytical method is proposed to calculate the anchorage stress by considering the shear slip of anchorage interface. On the basis of the prestress loss mechanism, various factors causing prestress loss are analyzed, and then a method for calculating prestress loss is developed under the influence of various factors. According to fundamental theory of the solution of stress distribution, a method is presented to estimate the initial tensile tonnage of the anchor cable. During the excavation of underground caverns, the stress increment is considered as safety margin of initial tension of the anchor cable, and the prestress loss can also be taken into account. From the above, a finite element calculation program is compiled, and a case study of an underground caverns shows that the proposed method is reasonable.

Key words: underground caverns, prestressed anchor cable, mechanical characteristic, anchoring mechanism, prestress loss, initial tensile tonnage

CLC Number: 

  • TU 457

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