›› 2010, Vol. 31 ›› Issue (9): 2991-2994.

• Numerical Analysis • Previous Articles     Next Articles

A simplified method for calculating critical anchorage length of bolt

LONG Zhao1，ZHAO Ming-hua2，ZHANG En-xiang1，LIU Jun-long1   

  1. 1. Cscec Aecom Consultants Co., Ltd., Lanzhou 730000, China; 2. Institute of Geotechnical Engineering, Hunan University, Changsha 410082, China
  • Received:2008-12-24 Online:2010-09-10 Published:2010-09-16

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Abstract:

On the supposition that the distribution of shearing force in inverted triangular form between anchorage-body and surrounding soil, the displacement of the top of anchorage-body was calculated. Based on the analysis of pull-out bearing mechanism and deformation characteristics of bolt, which is similar with anti-floating pile, a displacement of shear mode between anchorage-body and surrounding soil was used to calculating the displacement of the surrounding soil. Then, a simplified method for calculating the critical anchorage length of bolt was deduced according to the displacement coordination between anchorage-body and surrounding soil. Comparative analysis results of two engineering examples show that the calculated values by the presented method agree well with the measured data. Furthermore, the calculation formula is a simple and easily remembered one and it has a specific value range. And it is appropriated to estimating the critical anchorage length of bolt in engineering design.

Key words: bolt, critical anchorage length, displacement, shear displacement method, simplified method

CLC Number: 

  • TU 753
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