(1. Department of Modern Mechanics,University of Science and Technology of China,Hefei,Anhui 230027,China;
2. The Third Research Institute of the Corps of Engineering,General Staff of PLA,Luoyang,Henan 471023,China)
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.
徐景茂1,2,顾金才2,陈安敏2,张向阳2,明治清2,夏世友2. 拱脚局部加长锚杆锚固洞室抗爆模型试验研究[J]. 岩石力学与工程学报, 2012, 31(11): 2182-2186.
XU Jingmao1,2,GU Jincai2,CHEN Anmin2,ZHANG Xiangyang2,MING Zhiqing2,XIA Shiyou2. MODEL TEST STUDY OF ANTI-EXPLOSION CAPACITY OF ANCHORED TUNNEL WITH LOCAL LENGTHENING ANCHORS IN ARCH SPRINGING. , 2012, 31(11): 2182-2186.
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