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Novel roadway blasting construction method

A technology of broken bodies and cutting holes, which is applied in blasting and other directions, and can solve problems such as crowding, affecting the effect of cutting, affecting the effect of blasting, and the scale of excavation, so as to achieve the effect of strengthening rock throwing and improving blasting effect

Inactive Publication Date: 2014-02-12
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the clamping effect of the rock, the cutting effect is not ideal, which affects the blasting effect and the excavation scale
According to the existing blasting methods, the traditional cutting blasting still cannot make good use of the free surface, and the rock after blasting cannot be completely thrown out of the cutting frame, and sometimes the phenomenon of "crowding" occurs, which affects the cutting effect , so the blasthole utilization rate of tunnel blasting is generally within 85%, which affects the tunneling efficiency

Method used

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  • Novel roadway blasting construction method
  • Novel roadway blasting construction method
  • Novel roadway blasting construction method

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Embodiment Construction

[0014] In conjunction with the accompanying drawings and examples, the brand-new shaft blasting construction method of the present invention is described as follows:

[0015] Take the circular shaft section as an example:

[0016] Taking the center of the wellbore as the center, the order of hole layout from inside to outside is projectile hole 1, cut hole 2, auxiliary hole 3, interval cut holes 4 and 5, and peripheral hole 6.

[0017] With the center of the wellbore as the center, a figure-eight projectile hole 1 is arranged on a circle with a circle diameter of 0.2-0.3m, and the oblique insertion angle is 80°-85°. Put 2 volumes of explosives 7 without any filling. When the cutout hole 2 on the side explodes first, the broken body just acts as a filler for the projectile hole 1, and the projectile hole 1 is detonated, which just lifts the broken body and can form a better free surface.

[0018] The ring diameter of the cut hole 2 is 1.4-1.6m larger than that of the projecti...

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Abstract

The invention discloses a novel roadway blasting construction method, belongs to the technical field of shaft building construction, and provides a novel cutting blasting shaft-forming construction method. Four kinds of blast holes are formed in a whole cross section of a roadway, wherein V-shaped ejection holes, cutting holes, auxiliary holes, interval cutting holes and peripheral holes are formed sequentially from inside to outside; and the cutting holes are formed on two sides of each auxiliary hole. Compared with other methods, free surfaces of the auxiliary holes is added, and the number of the free surfaces is increased from two to three; a blank hole is drilled at the interval of every two blast holes among the interval cutting holes and isn't filled with explosive; the oblique cutting angle of each ejection hole is 80-85 degrees, and a small amount of the explosive is filled in the ejection holes; and the reserved holes are taken as compensation space of the free surfaces and crushed rock mass during cutting hole blasting, and a throwing effect on rock mass after cutting hole blasting is realized. With the adoption of the novel interval cutting hole method, influences of blasting vibration on surrounding rock are reduced, the free surfaces are added, the cutting depth and the cutting size are increased, the blasting effect is improved, and the blasting efficiency is improved.

Description

technical field [0001] The brand-new tunnel blasting construction method of the invention belongs to the technical field of well construction. Background technique [0002] There are mainly two types of tunnel construction techniques, namely, the comprehensive mechanized construction method and the tunnel blasting method. The comprehensive mechanized construction method has the advantages of safety, continuous operation, uniformity, and high degree of automation. However, due to the limitations of heavy mechanical equipment, short tool life, small application range, and high cost, it is rarely used in rock tunnels and roadway excavation in my country at present. Therefore, the drilling and blasting method is the basic method for tunnel construction. When the rock firmness factor f>6, it is the only effective and economical method. [0003] At present, the eye layout method of drilling blasting is adopted: the order of eye layout from inside to outside is cut hole, auxil...

Claims

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Application Information

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IPC IPC(8): F42D1/00F42D3/00
Inventor 苏洪龚悦
Owner ANHUI UNIV OF SCI & TECH
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