Stress Evolution of Surrounding Rocks under Continuous Blasting of Deep-buried Tunnel

ZHANG Cheng; YANG Jian-hua; YAO Chi; CHEN Yi-yang

doi:10.11988/ckyyb.20170646

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Journal of Changjiang River Scientific Research Institute ›› 2018, Vol. 35 ›› Issue (12) : 108-112. DOI: 10.11988/ckyyb.20170646

ROCK-SOIL ENGINEERING

Stress Evolution of Surrounding Rocks under Continuous Blasting of Deep-buried Tunnel

ZHANG Cheng, YANG Jian-hua, YAO Chi, CHEN Yi-yang

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Abstract

The stress evolution law of surrounding rock during continuous blasting excavation in deep underground tunnel with high geostress is studied by ANSYS/LS-DYNA dynamic finite element software model. By comparing and analyzing the results of two working conditions, namely quasi-static stress redistribution, and ground stress redistribution coupled with blasting load, the evolution law and influential factors of stress evolution of surrounding rock under continuous blasting are obtained.Shear failure is the main failure pattern. The redistribution of stress is the main reason for the change of stress field in the surrounding area of the tunnel; blasting load only affects the surrounding rock stress in the adjacent of explosive holes by inducing damage. In the research case of this paper, continuous excavation unloading only affects the surrounding rock in the range of about four meters behind the working face, and after two successive footages, the stress field of surrounding rock of the tunnel is basically stable.

Key words

deep-buried tunnel / blasting excavation / in-situ stress redistribution / numerical simulation / high geostress

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ZHANG Cheng, YANG Jian-hua, YAO Chi, CHEN Yi-yang. Stress Evolution of Surrounding Rocks under Continuous Blasting of Deep-buried Tunnel[J]. Journal of Changjiang River Scientific Research Institute. 2018, 35(12): 108-112 https://doi.org/10.11988/ckyyb.20170646

References

[1] 刘宁, 张春生, 陈祥荣,等. 深埋隧洞开挖围岩应力演化过程监测及特征研究[J] . 岩石力学与工程学报, 2011, 30(9):1729-1737.
[2] 杨建华,姚池,卢文波,等. 深埋隧洞钻爆开挖围岩振动频率特性研究[J] .岩土力学,2017, 38(4):1-8.
[3] CHEN M, LU W B, YAN P, et al. Blasting Excavation Induced Damage of Surrounding Rock Masses in Deep-buried Tunnels[J] . KSCE Journal of Civil Engineering, 2016, 20(2):933-942.
[4] ZHUW C, GAI D, WEI C H, et al. High-pressure Air Blasting Experiments on Concrete and Implications for Enhanced Coal Gas Drainage[J] . Journal of Natural Gas Science & Engineering, 2016, 36:1253-1263.
[5] 范勇, 卢文波, 周宜红,等. 高地应力条件下深埋洞室围岩损伤区孕育机制[J] . 工程地质学报, 2017, 25(2):308-316.
[6] CAI M, KAISER P K, TASAKA Y, et al. Generalized Crack Initiation and Crack Damage Stress Thresholds of Brittle Rock Masses near Underground Excavations[J] . International Journal of Rock Mechanics & Mining Sciences, 2004, 41(5):833-847.
[7] GRADYD E, KIPP M E. Continuum Modeling of Explosive Fracture in Oil Shale[J] . International Journal of Rock Mechanics & Mining Science & Geomechanics Abstracts, 1980, 17(3):147-157.
[8] MARTIN C D,KAISER P K,MCCREATH D R. Hoek-Brown Parameters for Predicting the Depth of Brittle Failure around Tunnel[J] .Canadian Geotechnical Journal,1999,36(1):136-151.
[9] 李夕兵, 周子龙, 叶州元,等. 岩石动静组合加载力学特性研究[J] . 岩石力学与工程学报,2008, 27(7):1387-1395.
[10] 吴文平,冯夏庭,张传庆,等. 深埋硬岩隧洞围岩的破坏模式分类与调控策略[J] . 岩石力学与工程学报,2011,30(9):1782-1802.
[11] 李鹏, 周佳, 李振. 爆炸应力波在层状节理岩体中传播规律及数值模拟[J] . raybet体育在线院报, 2018, 35(5): 97-102.
[12] 钟权, 冷振东, 彭峥, 等. 节理岩体隧洞开挖爆破损伤特性及爆破方案研究[J] . raybet体育在线院报, 2018, 35(2): 89-94.
[13] TAO M, LI X, WU C. 3D Numerical Model for Dynamic Loading-induced Multiple Fracture Zones around Underground Cavity Faces[J] . Computers & Geotechnics, 2013, 54(10):33-45.