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Reverse hole distributing method used in longhole bench blasting

A technology for step blasting and hole layout, applied in blasting and other directions, can solve the problems of unevenness, unfavorable blasting standardization, and unfavorable drilling rig efficient operation, etc., and achieves the effect of neat slope top line, convenient standardized operation, and standardized operation time.

Inactive Publication Date: 2011-08-10
GUANGDONG HONGDA BLASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the process of blasting construction, due to the impact of blasting vibration, lithology difference and mechanical excavation, the slope top line of steps after blasting is often uneven
According to the method of distributing holes in the forward direction and the general principle of distributing holes, the connection line of blastholes is often caused to appear wavy, such as image 3 , this method of blast hole layout is not conducive to the realization of blasting standardization, and is also not conducive to the efficient operation of drilling rigs. With the improvement of blasting mechanization level, it is urgent to improve this kind of hole layout method

Method used

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  • Reverse hole distributing method used in longhole bench blasting
  • Reverse hole distributing method used in longhole bench blasting
  • Reverse hole distributing method used in longhole bench blasting

Examples

Experimental program
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Effect test

Embodiment 1

[0054] A quarry has an average monthly blasting volume of 600,000 m 3 (solid cube), a large-scale stone blasting project with a daily output of 40,000 cubic meters (solid cube). The rock formation in the mining area is biotite monzonite granite, the f value is 11-14, and the saturated compressive strength is 70-150MPa. The geological conditions in the mining area are complex, with well-developed joints, fissures, weathered trenches, and broken zones, and rich fissure water.

[0055] This project has the characteristics of large-scale blasting operations, frequent blasting times, many specifications of stone materials that require one-time blasting, strict blasting quality requirements, and narrow blasting operations.

[0056] Drilling equipment is Ingersoll Rand VHP750 down-the-hole drilling rig; step height H=15.0m, vertical hole, hole diameter Φ=140mm; for granite with f=11~14 ultra-deep 0.3~1.5m, hole spacing is mostly 5m, row The distance is mostly 4m.

[0057] In actua...

Embodiment 2

[0059] In 2009, an important blasting earthwork project in Northeast China contracted by our company was divided into two tenders. The total engineering volume of rock blasting in one of the bidding sections is about 10.38 million m 3 (Natural side), earthwork stripping 590,000 m 3 (natural side). The contract requires a construction period of 250 calendar days, and an average of 41,400 m of stones need to be shipped every day 3 , reaching 80,000 m per day during the peak period 3 . The total amount of earth and stone in the second tender section is 9,959,352 cubic meters, of which 497,968 cubic meters of topsoil is cleared and 9,461,384 cubic meters of stone is blasted. The construction period is 213 days. The construction period is tight and the task is heavy.

[0060] Aperture diameter 140mm; hole spacing 5-5.5m; row spacing 4-4.2m; hole depth 15m, super-deep 0.5-1.5m; average unit consumption 0.4kg / m 3 .

[0061] In actual work, due to the relatively heavy engineerin...

Embodiment 3

[0063] The Shenhua Zhungeer open-air stripping project undertaken by our company is located in the northeast of the Ordos Plateau, adjacent to the Yellow River in the east, and the terrain is high in the northwest and low in the southeast. Loess and red soil are widely distributed on the bedrock, the ground vegetation is sparse, the terrain is cut and broken, the gullies are deep, and the slope is large, which is easy for water drainage.

[0064] The total amount of stripping in the second phase is 12.1675 million m 3 , and the construction period is 245 days. The rock in the stripping area is semi-hard-hard rock, with a compressive strength of 8.14MPa-50.80MPa, generally greater than 9.81Mpa, most of which are greater than 19.61Mpa. The Platinum hardness coefficient is 1.93-5.90, and the bulk density of the rock is 2.4t / m 3 .

[0065] A roller cone drill with a diameter of 250mm is used to drill holes, the hole network parameters are 8×10m, the height of the main blasting ...

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Abstract

The invention relates to a reverse hole distributing method used in longhole bench blasting. In the reverse hole distributing method, the number of hole rows to be distributed in a blasting area, hole spacing and row spacing are determined in a conventional way, and then the holes are distributed by the following steps of: A, determining a minimum front-to-back spacing, B, distributing holes in the last row, C, distributing holes in other rows forwards in sequence, and D, adjusting the positions of holes in the frontmost row: adjusting the holes in the frontmost row in a fine adjustment way, a great adjustment way or a hole compensating way according to the orderliness condition of a bench crest line and the variation of a bench resistance line. The reverse hole distributing method can be used for realizing the orderliness of the blasted bench crest line; the distributed holes are distributed linearly so that the movement of a drilling machine and the aligning of drilled holes are facilitated and the drilling efficiency of the drilling machine is increased; and the reverse hole distributing method is beneficial to overcoming the defects of the traditional hole distributing method, is simple and feasible, can ensure a blasting effect, and is convenient to realize blasting operation standardization.

Description

technical field [0001] The invention relates to a method for arranging blastholes in step blasting, which is particularly suitable for blasting blasthole arrangement in the case of little change in lithology and large-scale mechanized operation in step blasting. Background technique [0002] Usually, when performing step blasting, the layout of the blast holes generally starts from the top line of the step face, and advances the holes row by row toward the rear of the step face. Make holes in the forward direction. The advantage of such a hole layout method is that the situation of the step surface and the bottom of the step, that is, the bottom of the slope, can be fully considered to ensure the blasting effect of the front row of blast holes. Step blasting parameters see figure 1 , see figure 2 . [0003] However, during the blasting construction process, due to the impact of blasting vibration, lithology difference and mechanical excavation, the slope top line of the...

Claims

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Application Information

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IPC IPC(8): F42D1/00
Inventor 郑炳旭王永庆李战军蔡建德
Owner GUANGDONG HONGDA BLASTING
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