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Single-sided annular kerf energy gathering grain, indoor test and application

A technology of slitting and graining, which is applied in the preparation of test samples, fuel testing, measuring devices, etc., can solve problems such as large performance differences, difficulty in measuring explosion stress waves, errors, etc., to reduce the bulk rate, improve Crushing effect, effect of increasing the number of cut holes

Pending Publication Date: 2020-08-07
ANHUI UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technology is to use transparent rock made of resin as a similar material to prepare the model required for the test, and observe the range of rock blasting damage and rupture by exploding in the transparent rock. Since the performance of similar materials used is quite different from that of rock, it is inevitable There is an error
Moreover, the transparent rocks made of resin are all finished products, and it is difficult to set sensors or strain gauges at different distribution positions in it according to different charge forms, and it is difficult to measure the blast stress wave.

Method used

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  • Single-sided annular kerf energy gathering grain, indoor test and application
  • Single-sided annular kerf energy gathering grain, indoor test and application
  • Single-sided annular kerf energy gathering grain, indoor test and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The blast crack and blast stress wave test of the single-sided circumferentially slit shaped charge includes the following steps:

[0054] 1) Mix cement, fine sand and water in a ratio of 1:4:1 to prepare cement mortar, and then add cement mortar into the steel sleeve 4 with a diameter of 600 mm and a height of 600 mm. When the cement mortar is poured to a height of 250 mm, the A PVC pipe with a diameter of 25mm is fixed in the middle of the steel sleeve 4 to reserve a blasthole 7, and two sets of strain bricks 6 are placed close to the blasthole in advance, and the two sets of strain bricks 6 are respectively facing the designed slit position and back-to-cut. Seam position, the material used for the strain gauge carrier in the strain brick 6 is also made of cement, fine sand and water in a ratio of 1:4:1, mainly to ensure that the measured explosion stress wave energy can most truly reflect the stress wave test piece 5 The medium transmission has consistency, the strai...

Embodiment 2

[0060] An underground 800m sandstone roadway adopts a cutting blasting method with a single-sided circumferential slit and energy-concentrating charge, including the following steps:

[0061] 1) Hydraulic drilling rig, 2.6m long drill rod, and Φ42mm drill bit are used to carry out drilling operations according to the blasting design plan, using wedge-shaped cutouts, and the outside of the cutout hole is one circle of caving holes and two circles of caving holes in sequence , three circles of caving holes and peripheral holes, the designed cutting hole depth (the depth of the vertical working face) is 2.4m, the depth of other blasting holes is 2.2m, the left and right symmetrical hole spacing of the cutting holes is 1500mm, and the upper and lower hole spacing is 450mm, close to the digging The distance between a circle of caving holes and the opening of the cutting hole should be strictly controlled at about 250mm, the distance between the caving holes and the row distance betw...

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Abstract

The invention discloses a single-face annular kerf energy gathering grain which comprises an explosive column shell and explosives, annular kerfs are cut in the explosive column shell every 2-3 timesof the inner diameter of the explosive column shell along the axial direction, the width of each annular kerf is 3-6 mm, the angle of each annular kerf is 120-180 degrees, and the explosive column shell is filled with the explosives. The invention further provides a laboratory test method and a field application technology of the single-sided annular kerf energy gathering grain. According to the laboratory test method, the distribution characteristics of the single-sided circumferential blasting cracks can be intuitively observed, the single-sided circumferential explosion stress field distribution can be accurately measured, and the single-face annular kerf energy gathering grain is applied to roadway tunneling blasting, and the result shows that the single-face annular kerf energy gathering grain can improve the groove cavity crushing effect, reduce the large block rate, improve the slotting blasting throwing effect, reduce the clamping effect of a ground stress clamp borne by rock,improve the blast hole utilization rate and the tunneling footage, shorten the tunneling operation time and save the economic cost.

Description

technical field [0001] The invention relates to the technical field of blasting, in particular to a single-sided circumferential slit energy-gathering charge column, indoor test and application. Background technique [0002] Cutting blasting is commonly used in roadway excavation. The quality of the cutting in the cutting blasting is the key factor that determines the rock breaking effect of the entire section blasting and the circular footage. Judging from the examples and theoretical analysis of tunneling and blasting in hard rock roadways and deep hole blasting in roadways at home and abroad, the most commonly used cutting form is wedge-shaped cutting, which can make full use of the only free surface of the working face and use less Borehole consumption and explosive consumption, to obtain a larger cavity volume. As the development of mineral resources gradually goes deep, the rock mass is subjected to the initial in-situ stress, and the rock clamping effect is enhanced....

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N33/22
CPCG01N1/28G01N33/227
Inventor 汪海波王梦想魏允伯雷小磊马守龙徐颖刘曙杰黄以寿宗琦吕闹吴捷豪程兵
Owner ANHUI UNIV OF SCI & TECH
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