拱脚局部加长锚杆锚固洞室抗爆模型试验研究

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Abstract Based on Froude similarity law，contrast model test on anti-explosion capacity of reinforced tunnels with local lengthening anchors in arch springing and equal length anchors is carried out. Mechanical and deformation characteristics and failure patterns of anchored tunnels are analyzed in the test. The research results indicate that，compared with equal length anchors，on one hand，under the extreme condition，when explosion center is very close to the tunnel，local lengthening anchors in arch springing have a closure effect on explosion load；and it can increase the explosion load on arch and the increment speed of relative displacement between vault and footwall. On the other hand，under the general condition，when explosion center is slightly far away from the tunnel，local lengthening anchors in arch springing can share or divert more explosion load；and consequently explosion pressure around tunnel，relative displacement between vault and footwall，the peak and residual values of compression strain at arch springing are decreased radically. Furthermore，the number of cracks in adjacent rock can be decreased and cracked degree are alleviated by preventing cracks from engendering and extending；namely it is propitious to enhance anti-explosion capacity of the tunnel.

Key words： geotechnical engineering similarity law model test anti-explosion capacity explosion load failure patterns

Received: 01 April 2012

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http://www.rockmech.org/EN/Y2012/V31/I11/2182

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