Safety control standard of blasting vibration for tunnels with existing cracks and cavities

GUO Xinxin; LIU Jinchao; WANG Bo; YU Wei; WANG Zhenyu; LI Haobin

doi:10.11883/bzycj-2019-0315

Volume 40 Issue 11

Nov. 2020

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GUO Xinxin, LIU Jinchao, WANG Bo, YU Wei, WANG Zhenyu, LI Haobin. Safety control standard of blasting vibration for tunnels with existing cracks and cavities[J]. Explosion And Shock Waves, 2020, 40(11): 115201. doi: 10.11883/bzycj-2019-0315

Citation:

GUO Xinxin, LIU Jinchao, WANG Bo, YU Wei, WANG Zhenyu, LI Haobin. Safety control standard of blasting vibration for tunnels with existing cracks and cavities[J]. Explosion And Shock Waves, 2020, 40(11): 115201. doi: 10.11883/bzycj-2019-0315

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Safety control standard of blasting vibration for tunnels with existing cracks and cavities

doi: 10.11883/bzycj-2019-0315

GUO Xinxin^1
,,
LIU Jinchao¹,
WANG Bo^{1
,
,},
YU Wei¹,
WANG Zhenyu¹,
LI Haobin^1,2

1.
Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, Sichuan, China
2.
Henan Provincial Communications Planning & Design Institute Co Ltd, Zhengzhou 450052, Henan, China

Received Date: 2019-08-16
Rev Recd Date: 2020-07-28
Publish Date: 2020-11-05

Abstract

Abstract

Most of safety control standard studies for existing tunnels under blasting vibrations are based on the premise that the existing tunnels are intact, and the effects of existing defects under the dynamic response are not considered. Therefore, based on the proposed new tunnel next to the Xinling tunnel as the engineering background, according to the actual distribution characteristics of tunnel defects (cracks and back-cavities), the two-dimensional and three-dimensional numerical models were established to analyze the influence of defects under structural dynamic response. Moreover, the standard management system was established. The results show that the most unfavorable distribution position of cracks is the side wall of explosion-proof which mainly increases the response of the lining structure to stress S₁ (tensile stress). The control standard should take the stress S₁ and the propagation depth of crack as the quantitative indicators. When the propagation depth is (0−1/8)h, (1/8−1/2)h, and ＞(1/2)h (h represents the thickness of the lining structure), the corresponding vibration velocity limit value is 12, 10, and 8 cm/s, respectively. The most unfavorable distribution position of back-cavities is at the arch crown, which increases the dual response of the lining structure to the stress S₁ and the vibration velocity, and the vibration velocity response is the main one. The control standard should take the vibration velocity, plane size and longitudinal length of the cavity as the quantitative indicators. The vibration velocity limit value is 12 cm/s. When the longitudinal length of the cavity is less than 7 m, the monitoring range is 3−4 times of the longitudinal length; when the longitudinal length of the cavity is greater than 7 m, the monitoring range is 1−1.5 times of the longitudinal length; when the longitudinal length of the cavity is small, the multiple takes a large value.
- tunnel engineering,
- control standard,
- LS-DYNA 3D model,
- crack,
- cavity

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