In-hole explosive charging structure for controlling blasting toe rock and construction method of in-hole explosive charging structure
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A technology for controlling blasting and construction methods, which is applied in blasting and other directions, and can solve problems such as the difficulty of controlling the blasting root, achieve the effects of ensuring the crushing and throwing effect, reducing the large block rate of the orifice, and enhancing the crushing effect
Active Publication Date: 2020-11-06
CHANGAN UNIV
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[0004] Aiming at the technical problems existing in the prior art, the present invention provides an in-hole charge structure for controlling the blasting foundation and its construction method, so as to solve the technical problem that it is difficult to control the blasting foundation in the prior art. The detonator regulates the transmission of explosive energy to realize the optimal utilization of explosive energy
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preparation example Construction
[0039] The preparation of the inert interlayer 5 can be determined according to the site conditions, as long as it is ensured that the explosives in the upper and lower sections of the interlayer do not explode each other, preferably, the inert interlayer 5 adopts inert materials such as airbags, sandbags or sandbags; The axial dimension of the inert interlayer 5 along the blast hole is 1.5-2 times the distance of the explosive detonation, and the diameter of the inert interlayer 5 is 0.85 to 0.95 times the diameter of the blast hole.
[0040] The length of the blocking section 2 is 0.9 to 1.0 times of the minimum resistance line 13; when the finished drug roll is used in the upper charge section 31 or the lower charge section 32, the uncoupled charge is used, and the uncoupling coefficient is 1.2 to 1.5; When the upper charge section 31 or the lower charge section 32 adopts on-site mixed charge, the coupled charge is used.
[0041] The charge structure in the hole for control...
Embodiment
[0061] During the construction of a petrochemical base, a large amount of earth and stone excavation was involved, and the method of deep hole step blasting was mainly used. The height of the steps in conventional blasting is 13.0m, the holes are arranged in a quincunx shape, the row spacing between the blastholes is 6.0m×3.5m, the diameter of the blastholes is 115mm, the inclination angle α is 80°, the drilling depth is 14.5m, and the charge length is 9.0m. The explosives used are 2# rock emulsion explosives, and the finished product rolls.
[0062] Adopt a kind of charging structure in the hole that is used for controlling blasting root of the present invention, concrete method comprises the following steps:
[0063] (1) Drilling blast holes: According to the blasting design requirements, drill blast holes up to the design elevation, and reserve 20-30cm of over-drilling.
[0064] (2) Hole forming quality inspection and hole bottom leveling: first check the hole forming qual...
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Abstract
The invention discloses an in-hole explosive charging structure for controlling blasting toe rock. An inertia partition layer is arranged in an explosive charging segment, and the explosive charging segment is partitioned into an upper explosive charging segment and a lower explosive charging segment. A first detonating primer is arranged on the middle and lower portion of the upper explosive charging segment, and a second detonating primer is close to the top end of the lower explosive charging segment. The first detonating primer and the second detonating primer are connected to a blasting network through leg wires correspondingly. According to the in-hole explosive charging structure, explosives filling a blast hole are divided into the upper explosive charging segment and the lower explosive charging segment through the inertia partition layer; the explosives located above the inertia partition layer are used for forming an ideal blasting crater so that the crushing and casting effects of a rock mass can be guaranteed; the explosives located below the inertia partition layer are used for enhancing crushing of a hole bottom rock mass so that the blasting toe rock can be decreased; the adjustment and control effect, on transmission of blasting energy, of the detonating primers is utilized fully, and optimized utilization of the explosive energy is achieved; and the dual purposes that the ideal blasting crater is formed to guarantee the crushing and casting effects, and the crushing of the hole bottom rock mass is enhanced to decrease the blasting toe rock can be achieved.
Description
technical field [0001] The invention belongs to the technical field of geotechnical engineering blasting, and in particular relates to an in-hole charge structure for controlling the blasting foundation and a construction method thereof. Background technique [0002] In mining, transportation, hydropower and municipal engineering fields, blasting excavation or mining of rock mass is often involved, and drilling bench blasting is a widely used method. In step blasting, the control of the residual foundation cannot be ignored, because too much foundation will not only hinder the launch of the blasting chassis of the next step, affect the blasting effect of the subsequent steps, but also increase the cost of its secondary treatment, and greatly reduce the construction s efficiency. How to effectively control the blasting root has always been a difficult problem that plagues the construction personnel on site. [0003] Existing methods for controlling the blasting foundation m...
Claims
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