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In-situ Test Study on Propagation Law of Blasting Seismic Wave of Shallow Mountain Tunnels

Author: ChenLiangLiang
Tutor: LiZhangMing；FengQiang
School: Guangdong University of Technology
Course: Geotechnical Engineering
Keywords: The mountains shallow reasonable tunnel Blast vibration Propagation law Field test Cavity Effect Excavation sequence
CLC: U455.6
Type: Master's thesis
Year: 2011
Downloads: 117
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Abstract

About 75% of our territory is mountainous or heavy mound. With the development of high-grade highways, the increasing size of the mountain highway tunnel. Eradication roads diseases and protect the natural environment from the point of view, the construction of high-grade highway tunnel is the future trend. In this paper, to extract information relevant literature on engineering blasting vibration effects research status and problems of the basic theory and technology of drilling and blasting, by Kirin Alexander span the small spacing super shallow overlying 110KV high-pressure corner electric tower tunnel engineering the blasting vibration field trials and using Matlb7.1 own programming analysis of the test data, and efforts to study the blasting vibration wave propagation. Kirin Mountain Tunnel Blasting Excavation not only the formation of voids and the formation of empty priorities excavation guide hole on the left side of the left hand lane, the left lane of the right side of the guide hole being excavation, no excavation of the rest of the special conditions points arranged in a cross-sectional surface blasting vibration field trials. Following research: (1) meet the premise of the tunnel blasting effect, undercutting segments blasting reduce the maximum segment charge volume, can be a significant weakening of the vibration intensity, maximum vibration velocity before and after the damping ratio of 2/3; through discussion come to, the undercutting area, caving to take the surrounding area blasting may lead to the the maximum blasting vibration speed, the bursting of the cut area does not necessarily lead to the maximum vibration intensity, vibration intensity related to the free surface, with the amount of charge factors. (2) blasting hollow just above the vibration amplification effect from the explosion source more distant hole on one side with a vibration narrowing effect. Distance away from the explosion source level maximum vibration velocity of 12m at cavity just above the surface points of symmetry there empty surface points 1.50-1.60 times the distance of 24m at the maximum vibration velocity of the existence of the empty side of the surface points away from the explosion source level is symmetric The presence of the empty surface points 0.54-0.71 times. Given attenuation law does not comply with Sa Road Hargreaves formula, rather than the empty lot Sa Road Hargreaves formula strength prediction, and the presence of the empty surface points vibration velocity than there is no empty symmetrical points, indicating presence of empty lots the empty upper surface vibration amplification, and the empty side of the measuring point vibration velocity than far away from the explosion source, there is no hollow symmetrical points, indicating that the hollow truncated wave damping. (3) Select the Sa Road Minkowski empirical formula of correction after the usual formula of Japan, the United States Bureau of Mines empirical formula described blasting attenuation law and a comparative analysis of the usual formula Sa Road Minkowski empirical formula and corrected well The description does not exist an empty lot of ground vibrations wave propagation, linear correlation coefficient reached 0.98, and the description of the empirical formula of the U.S. Bureau of Mines, the linear correlation coefficient of only 0.83. There is no test data into the data of the surface points of the empty lots, empty lots of surface points there are empty and there is no data, there are empty lot surface measured point data into three categories, the three empirical formula of linear regression of the three types of data, results show that the first-class data linear regression correlation coefficient, followed by the second type of data the linear correlation coefficient, and third-class data linear regression correlation coefficient minimum. Cavity Effect applied to actual projects, draw two Kirin Mountain Tunnel and its security and stability of the electrical towers overlying two suggestions: 1, Kirin Hill Tunnel excavation of the guide hole on the left side of the left hand lane formation advised to empty, right line, the right side of the left lane of the guide hole blasting K16 465 due to the presence of voids, imports direction Proximity left lane of about 3.5m of soil cover at the electrical towers vibration narrowing effect, is conducive to the security and stability of the electrical towers; 2, Kirin Hill Tunnel intermediate rock cylinder thickness of only 4.7m, when the right line of the left side of the guide hole blasting, the right side of the left lane of the pilot tunnel excavation, the left lane of the right side of the wall with the right line the left side of the explosion source Jinju 4.7m party to blasting vibration have a direct impact on the strength and distance, the smaller the distance, the greater the vibration intensity; another party empty positive the above amplification effect, suggesting that the right line the left side of the guide hole blasting blasting at the right wall of the left lane of the vibration speed greater than the explosion source is symmetric point there is no vibration velocity of the empty lot. Draw the the Unicorn Mountain tunnel right line guide hole on the left side to the left line before blasting excavation should be to complete the construction of the second lining and meet the design strength, would be beneficial to the security and stability of the right side of the left tunnel wall.

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CLC: > Transportation > Road transport > Tunnel project > Tunnel construction > Drilling, blasting
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