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Tunneling smooth surface blasting method

A technology of smooth blasting and tunneling, which is used in blasting, tunneling, earth-moving drilling, etc., can solve the problems of poor smooth blasting effect and large harmful effect of vibration on the uniform light surface, and achieves the goal of improving the destructive effect and ensuring the blasting effect. Effect

Active Publication Date: 2019-10-29
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at problems such as the poor effect of the existing smooth surface blasting and the large vibration harmful effect of the blasting on the same light-emitting surface, etc., and invents a smooth surface blasting method for tunnel excavation

Method used

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  • Tunneling smooth surface blasting method
  • Tunneling smooth surface blasting method
  • Tunneling smooth surface blasting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1: as Figure 1~4 As shown, a smooth blasting method for tunnel excavation, uniformly open smooth blasting holes on the tunnel rock (see figure 1 with figure 2 ), the uncoupled charge device for smooth blasting is placed in the smooth blasting hole, and the digital electronic detonator is used to realize the smooth hole-by-hole precise short-delay blasting of tunnel excavation;

[0041] The distance between the smooth blast holes is 8~12 times of the blast hole diameter, and the delay time of the digital electronic detonator is 9~12ms;

[0042] The uncoupled charge device for smooth surface blasting is structure A (see image 3 ): The uncoupled charging device for smooth blasting includes charge volume fixed arc plate III6, explosive charge roll I5, detonating cord I4, digital electronic detonator III7, explosive charge roll I5 is fixedly arranged on charge roll fixed arc plate III6 , the detonating cord I4 is sequentially connected to the explosive charg...

Embodiment 2

[0053] Embodiment 2: a kind of smooth surface blasting method of tunnel excavation, evenly offer smooth surface blasting hole on tunnel rock (see figure 1 with figure 2 ), the uncoupled charge device for smooth blasting is placed in the smooth blasting hole, and the digital electronic detonator is used to realize the smooth hole-by-hole precise short-delay blasting of tunnel excavation;

[0054] The distance between the smooth blast holes is 8~12 times of the blast hole diameter, and the delay time of the digital electronic detonator is 9~12ms;

[0055] The uncoupled charging device for smooth surface blasting is structure B: including digital electronic detonator I14 arranged at the bottom of the smooth surface blasting hole, the top of digital electronic detonator I14 is equipped with explosive binding device, and the top of explosive binding device is equipped with digital electronic detonator II10 , the leg wires of digital electronic detonator I14 and digital electronic...

Embodiment 3

[0071] Embodiment 3: A smooth blasting method for tunnel excavation, using an uncoupled charge device for smooth blasting, the specific steps are as follows:

[0072] (1) Choose Φ 32mm, emulsified explosive roll, length 30cm, weight 300g, density 0.95-1.30g / cm 3 , the explosive roll with a detonation distance of 3cm:

[0073] (2) Select the medicine coil to fix the curved plate and drug roll fixed arc plate , drug roll fixed arc plate and drug roll fixed arc plate The outer diameter is 34mm, the wall thickness is 2mm, and the cutting length is 1m; and drug roll fixed arc plate The outer diameter is adapted to the diameter of the smooth blast hole and the length is adapted to the explosive roll, and the explosive roll is bound to the fixed curved plate of the charge roll and drug roll fixed arc plate In the cavity between the inner walls of the explosive rolls and ensure that the adjacent explosive rolls have a certain distance, that is, 2 / 5 of the charge roll fix...

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Abstract

The invention relates to a tunneling smooth surface blasting method and belongs to the technical field of smooth surface blasting. According to the method, in terms of large-span shallow buried tunnels in urban centers, in order to protect tunnel surrounding rocks and reducing harmful effects of vibration of simultaneous smooth surface blasting to the maximum extent, smooth surface blasting holesare uniformly formed in tunnel rocks, uncoupled charging devices for smooth surface blasting are arranged in the smooth surface blasting holes, and smooth surface hole-by-hole precise short-time-delayblasting is achieved by adopting digital electronic detonators. The delay time of the digital electronic detonators in the holes is set in advance, when hole-by-hole precise short-time-delay blastingis performed, the edge stress distribution of the edges of blast holes is changed through time differences, stress of the blast holes is concentrated, accordingly, cracks are expanded and connected in the blast hole connecting line direction, and compared with simultaneous smooth surface blasting, vibration can be effectively reduced. By means of the blasting method, the smooth surface blasting effect is guaranteed, and blasting vibration in the smooth surface blasting process is also effectively controlled.

Description

technical field [0001] The invention relates to a smooth blasting method for tunnel excavation, belonging to the technical field of smooth blasting. Background technique [0002] Engineering blasting technology has also undergone great changes along with the development of the national economy. Through continuous practice and application, we have accumulated rich experience. In the construction of underground engineering and mining, the blasting method is a common method for hard rock. [0003] Smooth surface blasting is mainly used in underground engineering and tunnel excavation. It can effectively improve the smoothness of the roadway surface, with less cracks, less dangerous rocks, and less vibration. The safety of construction in the tunnel and the stability of surrounding rocks are also greatly improved. Smooth surface blasting generally needs to use special explosives, and the cost is relatively high. Often due to problems such as excessive drug dosage and concentr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F42D1/00F42D3/04E21D9/00
CPCF42D1/00F42D3/04E21D9/006
Inventor 李祥龙母永烨袁芝斌王子琛张其虎侯猛冷智高程明陶子豪
Owner KUNMING UNIV OF SCI & TECH
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