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Tunnel reserved contour protection rock curtain water pressure energy-gathered smooth blasting method

A technology of smooth blasting and tunneling, which is applied in blasting, tunneling, earthwork drilling and mining, etc. It can solve the problems of obvious overexcavation, many cracks, and low drilling quality, so as to reduce support workload, smooth the wall surface, and improve The effect of construction quality

Pending Publication Date: 2022-01-04
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the current problems of many fissures in surrounding rocks of grade IV-V, obvious over-excavation phenomenon and low drilling quality, the present invention provides a hydraulic pressure energy-gathering smooth surface blasting method for reserved rock curtains in tunnels

Method used

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  • Tunnel reserved contour protection rock curtain water pressure energy-gathered smooth blasting method
  • Tunnel reserved contour protection rock curtain water pressure energy-gathered smooth blasting method
  • Tunnel reserved contour protection rock curtain water pressure energy-gathered smooth blasting method

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Embodiment 1

[0023] The method of energy-gathering water pressure smooth surface blasting for the reserved profile rock curtain of Zihong No. 2 Tunnel:

[0024] According to the geological data and previous experience, the following points exist on the site: 1. The cracks in the surrounding rock are relatively developed, and the phenomenon of over-excavation is obvious; 2. The blasting parameters on site are unreasonable; 3. The quality of drilling on site is low. According to the actual situation of the site, in order to ensure the tidy profile of the IV-V surrounding rock sections after blasting, combined with the previous smooth blasting experience of tunnels with similar surrounding rocks, control the disturbance of the blasting vibration to the surrounding rock and reduce the impact of rock fragmentation and expansion on the surrounding rock after blasting. According to the disturbance effect of extrusion-unloading, the "reserved profile rock curtain energy-gathering water pressure smo...

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Abstract

The invention discloses a tunnel reserved contour protection rock curtain water pressure energy-gathered smooth blasting method, and belongs to the technical field of water pressure energy-gathered smooth blasting. By considering the confining pressure grade, the smooth blast hole distance, explosive selection and the special blasting construction technology, blasting vibration is effectively reduced, enough free faces are provided for smooth blast holes, disturbance and destroying of blasting to surrounding rock are relieved to the maximum extent, integrity and stability of original rock are kept as much as possible, it is ensured that the contour of the section of the blasted surrounding rock is neat, tunnel over-excavation is effectively controlled, the use amount of tunnel slag and sprayed concrete is reduced, and consumption of fireworks is reduced.

Description

technical field [0001] The invention belongs to the technical field of hydraulic energy-gathering smooth-surface blasting, and in particular relates to a method for hydraulic-pressure energy-gathering smooth-surface blasting of rock curtains reserved for tunnel protection. Background technique [0002] The drilling and blasting method has low cost, flexible operation and wide application range in rock mass excavation. The blasting design can be adjusted at any time according to the excavation size and geological conditions. Therefore, it is widely used in tunnel excavation, mining and underground engineering. Drilling and blasting excavation is a key link in tunnel excavation, and it is the basis for planning progress, construction period, materials, etc. The quality of its work has the greatest impact on the cost and progress quality of the tunnel. If the average linear over-excavation is reduced by 5cm, 1.1m of rock can be excavated per meter of tunnel 3 , Reducing over-e...

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 王梅张慧珍王晨龙杨永康
Owner TAIYUAN UNIV OF TECH
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