›› 2009, Vol. 30 ›› Issue (6): 1799-1804.

• Numerical Analysis • Previous Articles     Next Articles

Identification of surrounding rock quality based on dynamic testing technology of integrated anchor

CHEN Jian-gong，HU Jun-qiang，ZHANG Yong-xing   

  1. College of Civil Engineering, Chongqing University, Chongqing 400045, China
  • Received:2007-11-05 Online:2009-06-10 Published:2011-03-09

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Abstract:

Integrated anchor system contains integrated bolt, full cement grouting and surrounding rock. In low strain dynamic response of bolt model, the action of cement grouting and surrounding rock on bolt can be considered as elastic and damping coefficients which distribute uniformly along bolt and stiffness and damping coefficients which distribute uniformly on the bottom section of it. These coefficients, named dynamic parameters, present anchorage quality, mechanical behaviors of surrounding rock are also presented. Based on the relationship between dynamic parameters of bolt system and physico-mechanical parameters of surrounding rock, the quality of surrounding rock can be identified. Three-dimensional axisymmetric calculation model is established by using finite element analysis. The velocity responses of bolt’s top with different physico-mechanical parameters of surrounding rock are obtained. A method to identify the dynamic parameters of integrated anchor system is established based on theoretical solution of integrated bolt’s dynamic response and genetic algorithm. The dynamic parameters of integrated bolt with different physico-mechanical parameters of surrounding rock are acquired; and the relation between bolt-side elastic coefficient and surrounding rock’s modulus of deformation is established. A method to identify the quality of surrounding rock through dynamic testing based on integrated anchor system is put forward.

Key words: bolt, dynamic response, finite element method, genetic algorithm

CLC Number: 

  • TU 459+.3
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