›› 2009, Vol. 30 ›› Issue (9): 2805-2809.

• Numerical Analysis • Previous Articles     Next Articles

Numerical analysis of reinforcement effects and response to dynamic loads characteristics of rock bolts

YANG Zi-you1, 2, GU Jin-cai2, 3, YANG Ben-shui1, CHEN An-min3, XU Jing-mao3   

  1. 1. School of Civil Engineering, Anhui University of Architecture, Hefei 230022, China; 2. Department of Modern Mechanics, University of Science and Technology of China, Hefei 230026, China; 3. The Third Research Institute of the Corps of Engineering, General Staff of CPLA, Luoyang 471023, China
  • Received:2008-03-05 Online:2009-09-10 Published:2010-03-24

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Abstract:

The explicit dynamic analysis of the reinforcement effects and dynamic characteristics of rock bolts is carried out by LS-DYNA software. The change features of vertical stress of rockmass, vault displacement and axial strain of rock bolts themselves caused by explosive waves are compared whether wall rock is reinforced or not. By comparing the cavern that is not reinforced, the stress of wall rock is larger and the displacement of vault is less than the cavern that is reinforced by rock bolts. By analyzing the axial strain temporal curves of rock bolts, the response to the dynamic loads is different when rock bolts’ installing angles are different. The rock bolts of vault bear pressure at first and tension after., and the rock bolts in upright wall bear tension absolutely. The axial tension strain generates at these two positions. The comparison between the axial strain temporal curves and the corresponding curves is carried out in model test. These two curves are compatibility. This simulation provides the references of arrangement methods in wall rock of tunnels reinforced by rock bolts under the effect of dynamic loads.

Key words: rock bolts, reinforcement effect, explosive wave, numerical analysis, mechanical characteristics

CLC Number: 

  • TD 353
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