Numerical Analysis of the Anti-Explosion Effects and Anchored Mechanism of Tunnels Reinforced by Bolts under Top Explosion

Abstract:

The anti-explosion effects and anchored mechanism of tunnels reinforced by bolts were studied by numerical analysis. Comparing with compression-stress curve of the experiments and numerical simulation on the same location of the vault, it indicates that the simulation results are reliable. By contrast the vault displacement of anchored tunnel and unlined tunnel, it can be found that the vault displacement of the tunnel is significantly reduced through the reinforcement with anchor bolts. By comparing the crack distribution of the anchor tunnel and unlined tunnel, it shows that cracks of unlined tunnel are significantly thicker and wider than that of the anchored tunnel, which indicates that the anti-explosion effects of anchor rods are better. It can be known that the anchored bolts supporting can take effect of reinforcement and anti-explosion according to the time-histories curve of the anchor-head.

• Periodical: Applied Mechanics and Materials (Volumes 90-93)
• Pages: 1973-1980
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.90-93.1973
• Online since: September 2011
• Authors: Guang Yong Wang, Jia Qi Guo, Lian Wei Ren
• Keywords: Anchored Mechanism, Anti-Explosion Effects, Numerical Analysis, Rock Mechanic, Tunnels Reinforced by Bolts

References

[1] Taiyue Qi. Numerical simulation of interactional anchor rod and surrounding rocks [M]. Xuzhou: China University of Mining Press, 2002. (in Chinese)

[2] Jincai GU， Jun SHEN， Anmin CHEN，et al. Model testing study on strain distribution regularity in rock mass caused by prestressed anchorage cable [J]. Chinese Journal of Rock Mechanics and Engineering，2000，19(Supp.1)：917–921.(in Chinese)

[3] Shiming LI， Shengliang HAN, Xianming ZHENG, et al. Research progress of explosion-resistance behavior of anchorage type of structure [J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(supp.2)：3553–3562.(in Chinese)

[4] ORTLEPP WD, STACEY T R. Performance of tunnel support under large deformation static and dynamic loading [J]. Tunneling and Underground Space Technology, 1998, 13(1):15-21.

DOI: 10.1016/s0886-7798(98)00022-4

[5] GISLE.S, ARNE.M. The influence of blasting on grouted rock bolts [J]. Tunneling and Underground Space Technology, 1998, 13(1):65-70.

[6] TANNANT DD, BRUMMER RK, YI X. Rock bolt behavior under dynamic loading field tests and modeling [J]. International Journal of Rock Mechanics and Mining Science and Geomechanics Abstracts, 1995, 32(6):537-550.

DOI: 10.1016/0148-9062(95)00024-b

[7] ANDERS A. Laboratory testing of a new type of energy absorbing rock bolt [J]. Tunneling and underground space technology ， 2005, 20(4):291-300.

DOI: 10.1016/j.tust.2004.12.001

[8] ANDERS A. Dynamic testing of steel for a new type of energy absorbing rock bolt [J]. Journal of Constructional Steel Research, 2006, 62(5):501-512.

DOI: 10.1016/j.jcsr.2005.08.007

[9] ZHANG CS, ZOU DH, MADENGA V. Numerical simulation of wave propagation in grouted rock bolts and the effects of mesh density and wave frequency [J]. International Journal of Rock Mechanics and Mining Sciences, 2006, 43(4):634-639.

DOI: 10.1016/j.ijrmms.2005.09.006

[10] Suhang YANG， Bin LIANG， Jincai GU，et al. Research on characteristics of prestress change of anchorage cable in anti-explosion model test of anchored cavern [J]. Chinese Journal of Rock Mechanics and Engineering，2006，25(Supp.2)：3 749–3 756.(in Chinese)

[11] Ziyou YANG， Jincai GU， Anmin CHEN，et al. Model experiment study on the influence of reinforcement effects of intervals of rock bolts in wall rock under the effect of explosive waves[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(4)：757–764.(in Chinese)

[12] Guangyong WANG， Jincai GU， Anmin CHEN，et al. Model tests on anti- explosion anchoring effect of tunnels reinforced by dense bolts at arch top [J]. Chinese Journal of Geotechnical Engineering，2009，31(3)：378–383.(in Chinese)

[13] Ziyou Yang. Study on the Anti-detonating Characteristics of Underground Opening Reinforced by Rockbolts [Ph.D. dissertation] [D]. ​​University of Science and Technology of China, 2008.5. (in Chinese)

[14] Liangliang Zhang. Study on Stress Character of Prestressed Anchorage in Different Regional Antiknock Chamber Effected [Ph.D. dissertation][D]. ​​Wuhan University of Technology, 2008.5 (in Chinese)

[15] Yongqiang YU, Jincai GU, Xiaolin YANG, et al. Experimental Study on Applied Force of Reinforcement Cavity Rock Bolts under Dynamic Loading Conditions [J].ACTA ARMAMENTARII，2009，30(Suppl.2)：263-266.(in Chinese)

[16] Guilin LI, Yongqiang YU, Xinsheng WANG. Numerical Simulation of Cavity Bolt Reinforcement Effect under Dynamic Loading [J]. ACTA ARMAMENTARII，2009，30 (Suppl.2) ：378–383.(in Chinese)

[17] Jianjie CHEN， Jun SUN， Junde LIN，et al. Failure of rock openings under intensive explosion stress wave [J]. Journal of PLA University of Science and Technology，2007，8(6)：582–588.(in Chinese)

[18] Yadong XUE， Shiping ZHANG， Tianhe KANG. Numerical analysis of dynamic response of rock bolts in mining roadways [J]. Chinese Journal of Rock Mechanics and Engineering，2003，22(11)：1 903–1 906.(in Chinese)

[19] Yang JU， Changjing XIA， Heping XIE，et al. Numerical analysis of rupture of subfloor of coal mine tunnel subjected to blasting loads [J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(21)：3 664–3 668.(in Chinese)

[20] Jincai GU， Anmin CHEN， Jingmao XU，et al. Model test study of failure patterns of anchored tunnel subjected to explosion load [J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(7)：1315–1320..(in Chinese)

[21] Xianyun WU， Yuxiang ZHAO， Huiqi REN. On basic way to dramatically increase the bearing capacity of underground engineering in rock mass [J]. Chinese Journal of Rock Mechanics and Engineering，2003，22(2)：261–265.(in Chinese)