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Deep hole layered slotting blasting method for rock laneway

A technology for wells and deep holes, applied in blasting, earth-moving, mining equipment, etc., can solve problems such as affecting the progress of rock roadway excavation, fixed delay time, and inability to adjust according to needs, so as to improve the utilization rate of blastholes, improve The footage and level, the effect of speeding up the construction progress

Active Publication Date: 2022-04-01
NORTH CHINA UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the delay time between segments is relatively fixed and cannot be adjusted according to demand.
[0006] However, no matter which of the above-mentioned cutting methods is adopted, there is a problem of low utilization rate of the blast hole in the cutting hole in the surrounding rock cutting blasting technology of the rock roadway, which is not conducive to improving the single-cycle blasting footage and level, and affects the rock roadway excavation. Construction Schedule

Method used

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  • Deep hole layered slotting blasting method for rock laneway
  • Deep hole layered slotting blasting method for rock laneway
  • Deep hole layered slotting blasting method for rock laneway

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] In order to solve the problem of low blasthole utilization in the deep hole cutting blasting scheme of rock roadway, see Figure 3 to Figure 6 and Figure 9 As shown, the deep hole layered cutting blasting method for rock wells and roadways provided by the embodiments of the present invention is mainly suitable for blasting operations such as rock drilling operations, tunnels, roadway operations, and mines, and is particularly suitable for roadway blasting operations; The hard rock wells mentioned above specifically refer to vertical wells with rock firmness coefficient (Platt’s coefficient) f greater than or equal to 7, and also include hard rock wells determined by any other surrounding rock classification method. The deep hole specifically refers to a blasthole with a blasthole depth greater than or equal to any depth above 3.0m, especially a blasthole with a depth of 3.0-3.4.0m in a rock roadway and a blasthole with a depth of 6.0-10.0m in a wellbore.

[0052] It i...

Embodiment 2

[0092] see Figure 5 As shown, the solution provided by the embodiment of the present invention is similar to the technical solution of the first embodiment, the difference is that the lower layers of the No. 2 and No. 4 cut holes are also charged, and the upper and lower charge parts are separated, The lower layers of the No. 2 and No. 4 cut holes adopt No. 4 detonators to detonate at last.

[0093] No. 2, No. 3, No. 4 and No. 5 cutout holes are used to detonate the upper charge parts of No. 1 electronic detonator at the same time, and the upper part of No. 1 cutout hole is used as an empty hole to improve the blasting efficiency. Then detonate the upper charge part of No. 6 to No. 11 cut holes, adopt No. 2 electronic detonator to detonate, and the time difference between the previous detonation is 10ms ~ 15ms. Finally detonate 1 to 11 times, in which No. 3 and No. 5 cut holes are in the middle of the cut area, and their lower layers are empty holes, and the lower layer of N...

Embodiment 3

[0096] see Image 6 As shown, the scheme provided by the embodiment of the present invention is basically the same as the technical scheme of Embodiments 1 and 2, the difference is that the No. 1 cutout hole is an empty hole as a whole, that is, no medicine is charged; the No. 3 and 5 The lower layer of the No. cut hole is charged, and the upper and lower charge parts are isolated.

[0097] After detonating the upper layer charges of No. 2, No. 3, No. 4 and No. 5 cutting holes in the first cutting area, the first groove cavity is formed, and the remaining detonating steps are replaced by: using No. 2 detonators to detonate No. 2, The lower charge parts of No. 3, No. 4 and No. 5 cut holes are guided by the new free surface provided by the first cavity formed after the detonation of the lower hole of No. 1 cut hole and the upper charge part of the first cut area. The lower layers of No. 2, No. 3, No. 4 and No. 5 cut holes were blasted to form the second cavity;

[0098] The No...

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Abstract

The embodiment of the invention discloses a deep hole layered cutting blasting method for a rock roadway, relates to the technical field of drilling and blasting method rock roadway tunneling, can improve the shot hole utilization rate of cutting holes, and is beneficial to improving the single-cycle blasting footage and level. Comprising the following steps: drilling at least three groups of slotting holes which are arranged in a quadrilateral manner below an intersection point of a tunnel arch camber line and a center line; charging powder in each slotting hole in a layered manner; the upper layers of the second to fifth holes of the first slotting area are firstly detonated; the first slotting hole is used for guiding and controlling explosion stress waves formed by detonation of the explosives on the upper layers of the second slotting hole to the fifth slotting hole to impact the crushed rock in the direction of the center connecting line of the first slotting hole, and a first slotting cavity is formed in the first slotting area; a new free face formed by the first groove cavity is used for guiding holes from the sixth hole to the eleventh hole to be exploded; and guiding and controlling the lower layers of the first, sixth and eleventh holes to be detonated and then directionally crushing rocks by utilizing empty holes formed in the lower layers of the second to fifth holes and a new free surface formed after the upper layer is blasted. The method is suitable for blasting tunneling projects such as hard rock laneways, tunnels and chambers.

Description

technical field [0001] The invention relates to the technical field of drilling and blasting rock roadway excavation, in particular to a deep hole layered cut blasting method for rock roadway. Background technique [0002] For a long time, the excavation level of drilling and blasting rock roadway has hovered at the level of 70m / month, resulting in unbalanced mining and seriously restricting the continuous production of coal mines. The development of rock roadway excavation construction technology is very important to improve the level of rock roadway excavation and alleviate the contradiction of mining. Among them, the drilling and blasting method is mature in technology and low in cost, and occupies a dominant position in rock roadway excavation. Cutting is one of the important links in rock roadway drilling and blasting. At present, with the continuous increase of blasthole depth, the drilling and blasting method is generally adopted in hard rock conditions. [0003] E...

Claims

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Application Information

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IPC IPC(8): F42D1/00F42D1/08F42D3/04E21D9/00
Inventor 张召冉杨仁树岳中文马鑫民王雁冰谢平王岩项方备李扬薛茹镜张书铭李智矫伟刚郭义先
Owner NORTH CHINA UNIVERSITY OF TECHNOLOGY
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