scholarly journals Analysis on Influencing Factors of Blasting Vibration Caused by Shallow Tunnel Excavation

2019 ◽  
Vol 7 (4) ◽  
pp. 108
Author(s):  
Haixia Wei ◽  
Zheng Qu ◽  
Jie Zhu ◽  
Qiangqiang Zhang
Keyword(s):  
Influencing Factors ◽  
Blasting Vibration ◽  
Shallow Tunnel ◽  
Tunnel Excavation

Study on Blasting Vibration Effects of Shallow Tunnel Excavation

2011 ◽  
Vol 250-253 ◽  
pp. 2366-2370 ◽  
Author(s):  
Wen Xue Gao ◽  
Wen Long Sun ◽  
Hong Liang Deng ◽  
Xi Meng Sun
Keyword(s):  
Vibration Control ◽  
Ground Surface ◽  
Rock Fragmentation ◽  
Blasting Vibration ◽  
Shallow Tunnel ◽  
Tunnel Excavation ◽  
Surface Vibration ◽  
Multi Stage ◽  
Tunnel Blasting

Based on the practice of Huolang-yu tunnel of Mixing road reconstruction, this paper studies the monitoring of ground surface vibration and the technology of controlled blasting. The results show: (1) the ground surface vibration declines from constructed position to non-excavated areas along tunnel excavation direction. (2) The vibration control of wedge cutting holes blasting is the key to reduce or eliminate shallow tunnel vibrating calamity. And the replacement of the multi-stage small wedge cutting holes to the big wedge cutting holes ameliorates blasting vibration and rock fragmentation. (3) The overall monitoring of shallow tunnel blasting vibration and the effects, and optimum of the blasting design not only reduce blasting vibration but also ensure large circulation footage.

scholarly journals Influence of Small, Clear Distance Cross-Tunnel Blasting Excavation on Existing Tunnel below

2019 ◽  
Vol 2019 ◽  
pp. 1-16 ◽  
Author(s):  
Baofu Duan ◽  
Weizeng Gong ◽  
Guoshan Ta ◽  
Xuxu Yang ◽  
Xuewei Zhang
Keyword(s):  
Cross Section ◽  
Practical Significance ◽  
Blasting Vibration ◽  
Axial Distance ◽  
Tunnel Excavation ◽  
Vibration Effect ◽  
Blasting Excavation ◽  
Tunnel Blasting ◽  
Clear Distance ◽  
The Cross

The vibration effect generated during tunnel excavation can influence or damage adjacent tunnels. Studying and controlling the blasting vibration effect has important theoretical and practical significance, especially for new tunnels. This paper takes the tunnel project of Gao Jiu Lu-Jia Hua Cross Tunnel in Chongqing as the research background and assesses the blasting vibration influence in the up-down cross-tunnel. Onsite monitoring and numerical simulation were used to analyze peak particle velocity (PPV) changes, stress distribution, and crown settlement during the excavation process of Gao Jiu Lu I Tunnel at Jia Hua Tunnel Left Line in the cross-section. Influence laws of blasting excavation in a small, clear distance cross-tunnel on an existing tunnel below were obtained. Results show that new tunnel blasting vibrations exerted the largest influence on the crown of the existing tunnel below in the cross-section. The maximum tensile stress of the secondary lining of the existing tunnel below was mainly concentrated in the crown area. The maximum compressive stress during excavation was concentrated in the crown foot, and the stress value was less than the tensile and compressive strength of the concrete. The loosening of the surrounding rock from blasting excavation of the new tunnel caused secondary settlement of the existing tunnel crown below. The cumulative settlement value at the cross-section of the two tunnels was the largest. With an increase in axial distance from the cross-section of the existing tunnel crown, the settlement value gradually declined and became stable. These research results have reference value for the construction of a small, clear distance cross-tunnel and provide theoretical guidance for similar tunnel excavation projects in the future.

Optimization Analysis of Shallow Tunnel Excavation

2011 ◽  
Vol 243-249 ◽  
pp. 3599-3605
Author(s):  
Yao Qiang Zhao ◽  
Yuan Hai Li ◽  
Qing Fang Liu
Keyword(s):  
Surrounding Rock ◽  
Engineering Method ◽  
Shallow Tunnel ◽  
Rock Stress ◽  
Step Method ◽  
Tunnel Excavation ◽  
Section Method ◽  
Plastic Zones ◽  
Surrounding Rock Stress ◽  
Excavation Methods

In this paper, FLAC3D, the general software for geotechnical engineering project, is used to conduct two-dimensional numerical simulation for typical shallow tunnel excavation methods which include full-section method, the upper and lower step method, three-step method and CRD method etc.Effects of different excavation methods to the stability of tunnel surrounding rock are analyzed. The paper selected a subsistent tunnel as the research object. With construction simulation of different excavation methods, the paper makes comparative analysis of laws and characteristics of displacement of tunnel surrounding rock , stress distribution and size of plastic zones under different excavation methods. Study shows that: Ι.Followed by two step method, CRD engineering method and the full-section method successively, the three-step method is the best in the aspect of control of surrounding rock stress,; ΙΙ. Followed by full-section method, two- step method and the three step method successively, CRD engineering method is the best,in the aspect of size of plastic zones; Ш. Followed by three-step method, two-step method and the full-section method, CRD construction is the best in the aspect of control of surrounding rock displacement.

scholarly journals Monitoring and analysis of blasting vibration in tunnel excavation of nuclear power plant

2019 ◽  
Vol 22 ◽  
pp. 135-139 ◽  
Author(s):  
Jinlin Jiang ◽  
Haibo Li ◽  
Shengnan Hong ◽  
Yaqun Liu ◽  
Xiang Xia ◽  
...  
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Nuclear Power ◽  
Blasting Vibration ◽  
Tunnel Excavation

Monitoring and Analysis of Blasting Vibration of Diversion Tunnel Excavation in Layered Rock Mass

2012 ◽  
Vol 249-250 ◽  
pp. 1047-1052 ◽  
Author(s):  
Hua Feng Deng ◽  
Min Zhu ◽  
Le Hua Wang ◽  
Ji Fang Zhou
Keyword(s):  
Rock Mass ◽  
Vibration Monitoring ◽  
Damage Effect ◽  
Good Effect ◽  
Vibration Velocity ◽  
Blasting Vibration ◽  
Diversion Tunnel ◽  
Tunnel Excavation ◽  
Layered Rock ◽  
Layered Rock Mass

In order to insure the safety and stability of the existed dam body and dam curtain during the diversion tunnel excavation, the vibration velocities were analyzed based on in-site blasting vibration monitoring. Result shows that the elevation difference between explosion point and monitoring points has a great impact on the vibration velocity in addition to single fire dynamite and blast center distance. During data analysis, the traditional empirical formula of attenuation of blasting earthquake must be amended. Through contrasting and analyzing, the amended formula of attenuation of blasting earthquake wave is precise relatively. At the same time, two collapses during the diversion tunnel excavation were analyzed based on the characteristics of layered rock mass and fault distribution, and the explosion parameters were optimized, so that the damage effect of blasting vibration was controlled effectively. This research also takes a good effect in other similar works.

Characteristics of Multi-Storied Brick-and-Concrete Buildings Response to Blasting Vibration of Tunnel Excavation

2010 ◽  
Vol 163-167 ◽  
pp. 2608-2612 ◽  
Author(s):  
Hai Liang Wang ◽  
Tong Wei Gao
Keyword(s):  
Vertical Vibration ◽  
Vibration Velocity ◽  
Vibration Test ◽  
Blasting Vibration ◽  
Radial Vibration ◽  
Road Tunnel ◽  
Tunnel Excavation ◽  
Guide Line ◽  
Fire Station ◽  
Concrete Building

According to fire station of Tuandao road along to the Yunnan road tunnel of Qingdao Cross-harbor Tunnel Guide Line Project, the blasting vibration test was carried on. This building is three-storied brick-and-concrete building. Then monitoring data of particle vibration velocity was analysised and researched. The results showed that there is magnifying effect of vertical vibration velocity on the roof of the building, but its value is lesser than particle vibration velocity of the first layer. Horizontal tangential vibration velocity was existed on the central of the building. However there was no magnifying effect of horizontal radial vibration velocity. And its value is decreased rapidly from the first layer to the second layer, and then other floors basically keep steady.

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