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Rock burst prevention and treatment method based on explosive tamping hydraulic fracturing

A technology for hydraulic fracturing and rock burst, which is applied in the field of rock burst prevention and control based on hydraulic fracturing by blasting and ramming, and can solve the optimization of the blasting method for stress relief of the detonation network, the transient release of unfavorable excavation loads, and the inability to make full use of explosives. and other problems, to achieve the effect of strengthening the transient unloading effect, improving the effect of rockburst prevention and control, and improving the physical and mechanical properties

Active Publication Date: 2016-12-14
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the blasting energy of the explosives is lost due to the compression of the air in the blast hole, resulting in a decrease in the intensity of the stress wave, which is not conducive to the transient release of the excavation load on the excavation contour surface
The traditional stress-relieving blasting method uses soil or rock debris to block the blast hole or no backfill plugging. There are two major problems: the blasting cannot make full use of the explosive energy and pollute the environment.
In addition, the existing stress relief blasting method is still in the empirical stage, and the initiation network of the stress relief blasting method has not been optimized for the characteristics of the stress relief blasting method itself.
Therefore, there is still a lot of room for improvement in the blasting effect of the traditional stress relief blasting method

Method used

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  • Rock burst prevention and treatment method based on explosive tamping hydraulic fracturing
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  • Rock burst prevention and treatment method based on explosive tamping hydraulic fracturing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] A rockburst prevention and control method based on hydraulic fracturing by explosive ramming, comprising the following steps:

[0057] step one:

[0058] Use PNJ-A type gun mud machine to make gun mud. Local materials can be used to make gunpowder to save costs, and it is made according to the ratio of soil:sand:water=0.75:0.1:0.15. The gun mud should not be too soft or too hard. If it is too soft, it is easy to squeeze out the gun hole. When it is too hard, it is not easy to smash the gun mud, and the blockage is not solid. The finished blasting mud should not be placed for too long, it is best to make it 1-2 hours before use, otherwise it will lose water and become hard, and the effect of dust suppression will be affected after being blocked; Wrap in plastic wrap, or store in a cool place.

[0059] Step two:

[0060] (1) Select ceramsite proppant. At present, different manufacturers provide ceramsite proppants with different product specifications in the market, ...

Embodiment 2

[0077] In order to illustrate the implementation of the method of the present invention, a hole-shaped tunnel surface of a city gate is taken as an example.

[0078] For the drilling and blasting excavation of tunnels with high risk of rockburst, a shorter footage is generally adopted. The conventional excavation and blasting footage used in this embodiment is 2m, so the depth of the blasting hole for the advance stress relief can be set at 4.0~6.0m.

[0079] Strictly control the amount of charge in the blast hole for advance stress relief, and the amount of charge in each blast hole shall not exceed 50% of the charge for loosening blasting under the same conditions. The charge starts from the bottom of the blast hole for stress relief, and the length of the charge section does not exceed 1 / 3 of the depth of the blast hole for stress relief.

[0080] Assume that under the conditions of this embodiment, the depth of the conventional excavation blast hole is 2m, the plugging is 0...

Embodiment 3

[0099] In order to compare the stress relief effect with or without ceramsite proppant, the same charge structure and drilling method were adopted in another excavation footage under the same geological conditions, and ceramsite proppant was not mixed only in the preparation of water bags ( The only difference between Example 3 and Example 2 is that no ceramsite proppant is mixed in the water bag), so as to compare it with the working condition containing ceramsite proppant.

[0100] After the blasting of Example 3, the effect after the blasting of the blast hole is as follows: Figure 5 (b) shown.

[0101] The post-explosion effect of the advanced stress relief blast hole in Example 2 (without ceramsite proppant) is as follows: Figure 5 As shown in (a), the post-explosion effect of the advanced stress relief blast hole (including ceramsite proppant) in Example 3 is as follows: Figure 5 As shown in (b), under the joint action of ceramsite proppant and water, the blasting c...

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Abstract

The invention discloses a rock burst prevention and treatment method based on explosive tamping hydraulic fracturing. The rock burst prevention and treatment method comprises the following steps that stemming is made through a stemming making machine; a ceramsite proppant is selected; the selected ceramsite proppant is mixed into water, and the water mixed with the ceramsite proppant is poured into plastic bags, so that water bags are made; at least three rows of advance stress relieving blast holes are formed in the excavating face of a to-be-excavated tunnel through a drilling jumbo; explosive charging is conducted; the explosive charging structure that the water bags are charged into the bottoms of the blast holes, and composite backfilling and blocking are conducted on the tops of the blast holes through the stemming is adopted, so that the water bags and explosives are charged in sequence, and blocking is conducted through the stemming; the advance stress relieving blast holes are sequentially blasted in rows through a millisecond blasting method; and deslagging is conducted, and the steps are repeated till excavation is completed. The rock burst prevention and treatment method based on explosive tamping hydraulic fracturing is suitable for prevention and treatment of powerful rock burst (impact ground pressure) in the deeply-buried cavern excavation or deep mining process in the fields of water conservancy and hydropower engineering, transportation, mines and the like.

Description

technical field [0001] The invention relates to a rockburst prevention and control method based on explosive ramming hydraulic fracturing, which is suitable for the prevention and control of strong rockburst (rock burst) in the excavation of deep underground caverns or deep mining in the fields of water conservancy and hydropower projects, transportation, mines, etc. Prevention and treatment. Background technique [0002] The adjustment of national industrial policy and the implementation of the western development strategy have brought my country's hydropower construction into a period of development. Compared with the completed water conservancy and hydropower projects, most of the currently developed hydropower projects are located in the high mountains and valleys in the western part of my country, with extremely deep buried depth and extremely high ground stress level. Rockburst and other engineering geological problems occur frequently, often causing serious damage ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F42D3/04F42D1/08
CPCF42D1/08F42D3/04
Inventor 严鹏陈拓谢良涛卢文波陈明王高辉
Owner WUHAN UNIV
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