›› 2009, Vol. 30 ›› Issue (S1): 75-78.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Researches on pull-out capacity calculating method of rock bolt foundation

SUN Chang-shuai 1, 2, YANG Hai-wei3, XU Guang-li 1, 2   

  1. 1. Engineering Faculty, China University of Geosciences, Wuhan 430074, China; 2. Engineering Research Center of Rock-Soil Drilling & Excavation and Protection, Ministry of Education, China University of Geosciences, Wuhan 430074, China; 3. Hebei Electric Power Design & Research Institute, Shijiazhuang 050031, China
  • Received:2009-06-01 Online:2009-08-10 Published:2011-03-16

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Abstract:

As a special type of the tower-foundation in overhead transmission lines, the rock bolt foundation can give full play to the mechanical properties of rock masses in original state and provide a good pull-out performance. The results of the current prototype test of rock bolt foundation show that in the calculating model of the single anchor foundation’s pull-out capacity which is recommended in The technical requirements in overhead transmission lines foundation design, the hypothetical model of the ideal 45? does not match the actual damage. The calculation based on it makes larger deviations and the results may lead to unsafe design. To this end, based on the limit equilibrium principle and rock intensity, a more reasonable pull-out capacity calculating model, is established, and the relevant formula by mechanical derivation is obtained and simplified. Through the comparison and verification among the calculated values based on derived formula, actual values and designed values, the pull-out capacity is located in range limits and in good consistency with the calculated values of recommended formula . The results are feasible and able to meet the precision of engineering applications better.

Key words: rock bolt foundation, pull-out capacity, calculation method

CLC Number: 

  • TU 443
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