Method for directional energy-gathered blasting of retaining wall with low damage
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A low-damage, energy-gathering technology, applied in blasting and other directions, to achieve the effects of reducing surrounding rock damage, weakening damage, and strengthening directional effects
Inactive Publication Date: 2014-01-08
WUHAN UNIV
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[0003] Aiming at the deficiencies of the prior art, the present invention proposes a low-damage directional energy-gathering wall blasting method with simple process, convenient operation, safety and reliability, good controllability, and good effect. The seam charge blasting is organically combined, effectively exerting their advantages and overcoming the shortcomings of a single method, so as to achieve the purpose of reducing the damage of the surrounding rock and forming a smooth and flat wall surface
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Embodiment 1
[0020] Below in conjunction with accompanying drawing, the present invention is further described: as figure 1 , figure 2 As shown, a low-damage directional energy-concentrated wall blasting method includes the following steps:
[0021] (1) Drilling: Use a drilling rig to drill holes into the pre-excavated tunnel rock mass. The peripheral holes, caving holes and cutting holes are all 40mm, and the construction is carried out to the exact position according to the tunneling blasting plan;
[0022] ⑵High-pressure water jet grooving: Carry out hydraulic grooving on the peripheral eye, so that the grooving direction is consistent with the roadway contour line, and two rectangular slits are formed on the hole wall after grooving;
[0023] (3) Charging: put the shaped charge into the slit tube, the diameter of the slit tube is 36mm, and then put the charged slit tube into the drilled hole, so that the energy-gathering groove of the shaped charge and the tube of the slit tube The ...
Embodiment 2
[0033] A low-damage directional energy-gathering wall blasting method, comprising the following steps:
[0034] (1) Drilling: use the drilling rig to drill holes into the pre-excavated tunnel rock mass, and construct to the exact position according to the roadway excavation and blasting plan;
[0035] ⑵High-pressure water jet grooving: Carry out hydraulic grooving on the peripheral eye, so that the grooving direction is consistent with the roadway contour line, and two rectangular slits are formed on the hole wall after grooving;
[0036] (3) Charging: Put the energy-shaping charge into the slit tube, and then put the charged slit tube into the drill hole, so that the energy-gathering groove of the energy-shaping charge, the slit of the slit tube and the slot of the hole wall same direction;
[0037] ⑷Seal the hole: use yellow mud to seal the hole, and ensure that the detonation system is intact;
[0038] ⑸ Blasting: The electric detonation system is used for detonation. Aft...
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Abstract
A method for directional energy-gathered blasting of a retaining wall with low damage includes the following steps of (1) drilling, (2) high-pressure water jet grooving, (3) powder charging, (4) hole sealing and (5) blasting. The method for directional energy-gathered blasting of the retaining wall with low damage has the advantages that grooving blasting, energy-gathered cartridge bag blasting and joint-cutting cartridge bag blasting can be reasonably combined, and complementary advantages are achieved. According to the method, the water jet grooving mode is used so that the defects of cutter clamping, drill holding and the like existing in a traditional mechanical indenting mode can be overcome, and considering that the sizes of jet flow seams are determined by jet flow parameters, the problem that the blasting effect is affected due to the sizes of seam grooves can be solved. An energy-gathered cartridge bag and a joint-cutting tube are utilized, the fact that the directional effect is enhanced at the same time when surrounding rock is protected is made to be possible, and the problem that the energy-gathered cartridge bag can not be accurately placed into a blasthole is also solved. After initiation of explosion, the position of grooving is cracked first, meanwhile, the joint-cutting tube has a certain buffering function and a certain guiding function, the damage of explosion stress waves and detonation gas on the surrounding rock is weakened, and therefore the purposes that surrounding rock damage is lowered and a smooth flat wall face is formed can be achieved.
Description
technical field [0001] The invention relates to the technical field of directional fracture control blasting, in particular to a low-damage directional energy-gathering wall blasting method. Background technique [0002] At present, directional fracture control blasting technology has been widely used in the tunnel excavation construction process, mainly including blasting hole cutting blasting method, shaped charge blasting method, and slotted charge blasting method. Among them, slotting blasting refers to cutting a groove of a certain depth on the axial wall of the blasthole according to the blasting cracking direction and design requirements, and then carrying out charge blasting. The stress distribution makes the explosion stress concentrate on the tip of the slot, and then realizes the directional fracture of the rock mass. However, the traditional mechanical grooving method is prone to problems such as jamming, difficulty in orientation, twisted notch, severe abrasion...
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