AU2021102017A4 - Method for large-scale blasting with triple millisecond delays by loading explosive in three sections separated by stone powder in ultra-deep blast hole - Google Patents
Method for large-scale blasting with triple millisecond delays by loading explosive in three sections separated by stone powder in ultra-deep blast hole Download PDFInfo
- Publication number
- AU2021102017A4 AU2021102017A4 AU2021102017A AU2021102017A AU2021102017A4 AU 2021102017 A4 AU2021102017 A4 AU 2021102017A4 AU 2021102017 A AU2021102017 A AU 2021102017A AU 2021102017 A AU2021102017 A AU 2021102017A AU 2021102017 A4 AU2021102017 A4 AU 2021102017A4
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- Australia
- Prior art keywords
- hole
- blasting
- holes
- millisecond
- deep
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- 238000005422 blasting Methods 0.000 title claims abstract description 56
- 239000002360 explosive Substances 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000000843 powder Substances 0.000 title claims abstract description 15
- 239000004575 stone Substances 0.000 title claims abstract description 15
- 230000001934 delay Effects 0.000 title claims abstract description 9
- 238000005553 drilling Methods 0.000 claims abstract description 26
- 238000010276 construction Methods 0.000 claims abstract description 9
- 239000000839 emulsion Substances 0.000 claims abstract description 9
- 239000011435 rock Substances 0.000 claims abstract description 9
- 238000012790 confirmation Methods 0.000 claims abstract description 7
- 238000004140 cleaning Methods 0.000 claims abstract description 5
- 239000004927 clay Substances 0.000 claims description 17
- 238000009412 basement excavation Methods 0.000 abstract description 9
- 238000010304 firing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
- F42D1/04—Arrangements for ignition
- F42D1/06—Relative timing of multiple charges
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
- F42D1/08—Tamping methods; Methods for loading boreholes with explosives; Apparatus therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D3/00—Particular applications of blasting techniques
- F42D3/04—Particular applications of blasting techniques for rock blasting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D5/00—Safety arrangements
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Earth Drilling (AREA)
Abstract
The present disclosure provides a method for large-scale blasting with triple
millisecond delays by loading an explosive in three sections separated by a stone
powder in an ultra-deep blast hole. The method includes the following steps:
building an access road, leveling a top blasting surface, and carrying out tangential
construction on two benches; drilling holes simultaneously with crawler-type
down-the-hole drilling rigs, and cleaning the holes; loading a (p70 mm rock
emulsion explosive in sections separated by a stone powder, and installing a non
electric delay detonator; setting a hole-by-hole millisecond-delayed blasting
network in series and parallel connection; evacuating equipment, personnel and
an animal to a safe distance of 200 m, issuing an alert, and detonating after
confirming safety; checking after 15 min of blasting so as to eliminate any danger,
and clearing the alert upon a confirmation of no danger. The present disclosure
adopts ultra-deep hole blasting, which achieves an average daily excavation
volume of 8000-10000 m3, effectively accelerating the construction progress. The
present disclosure adopts blasting with millisecond delays between rows, between
holes and within the hole, which effectively reduces the vibration velocity (a
measured vibration velocity V is smaller than or equal to 5 cm/s).
1/3
3.5m 50ms 460
ms delay within the hole
108 1 2 3 4 5 6 7 8 9 |9
o o 50ms
llOms 460 ms delay within the hole
50ms
1lOMs 460 ms delay within the hole
o o o o50ms
460 ms delay within the hole
FIG. 1
Description
1/3
460 ms delay within the hole 3.5m 50ms
108 1 2 3 4 5 6 7 8 9 |9
o o 50ms llOms 460 ms delay within the hole
50ms
1lOMs 460 ms delay within the hole
oo o o50ms 460 ms delay within the hole
FIG. 1
TECHNICAL FIELD The present disclosure relates to a millisecond-delayed vibration-controlled blasting method which effectively reduces a vibration velocity, in particular to a new method for vibration-controlled blasting by loading an explosive in sections separated by a stone powder in a blast hole and sealing the top of the hole by wet clay. BACKGROUND The cut excavation section (K1+280 to K1+520) of the 1st bid package of civil engineering in the Anshun-Ziyun section of the Chishui-Wangmo Expressway in Guizhou Province crosses the Shanlan Bridge Tunnel (D2K787+172 to D2K787+755) on the Shanghai-Kunming Passenger Dedicated Line. The total length of the excavation section was 240 m, and the maximum excavation depth was 55.2 m. There were 4 to 7 benches on the excavation slope. The maximum width of the original ground excavation line was 139 m, and the width of the cut bottom was 29 m. The blasting volume was about 540,000 M 3 , and the height from the cut bottom to the top of the tunnel excavation section was 19.35 m. In order to avoid affecting the smooth progress of the joint commissioning test of the Shanghai-Kunming Passenger Dedicated Line, the construction of the substructure of the Shanlanpo Overpass Bridge must be completed on September , 2015, and the blasting vibration velocity must be controlled within 10 cm/s. SUMMARY An objective of the present disclosure is to propose a blasting method for effectively reducing vibration and speeding up the progress. The method is practical and efficient, and overcomes the problems of high vibration velocity and low efficiency in conventional blasting excavation. A method for large-scale blasting with triple millisecond delays by loading an explosive in three sections separated by a stone powder in an ultra-deep blast hole, including the following steps: (1) building an access road, leveling a top blasting surface, and carrying out tangential construction on two benches; (2) drilling holes simultaneously with four crawler-type down-the-hole drilling rigs in the left and right, where the drilling rig is provided with a diesel air compressor, and a drill bit has a diameter of plOO; an area within 1.5 m around the hole is cleaned; (3) cleaning the hole after drilling; (4) loading a P70 mm rock emulsion explosive in sections separated by a stone powder, and installing a non-electric delay detonator; (5) setting a hole-by-hole millisecond-delayed blasting network in series and parallel connection; and (6) evacuating equipment, personnel and an animal to a safe distance of 200 m, issuing an alert, and detonating after confirming safety, checking after 15 min of blasting so as to eliminate any danger, and clearing the alert upon a confirmation of no danger. The holes are arranged in a plum blossom pattern, with a spacing of 3.5 m between holes, a spacing of 4.0 m between rows and a depth of 8-10 m; four rows of holes are drilled per cycle, with 9 holes in each row. Explosive cartridges in bottom, middle and upper sections are respectively 2.5 m, 1.5 m and 1.0 m deep; the stone powder in each section is 1.5 m deep; wet clay is filled in a remaining section at the top of the hole. The millisecond-delayed blasting network has a delay interval of 110 ms between rows, a delay interval of 50 ms between holes and a delay interval of 460 ms within the hole. A method for vibration-controlled blasting by filling thick mud at the bottom of a blast hole and filling wet clay at the top thereof, including the following steps: (1) drilling holes with a crawler-type down-the-hole drilling rig, where the drilling rig is provided with a diesel air compressor, and a drill bit has a diameter of P42; an area within 1.5 m around the hole is cleaned; (2) cleaning the hole after drilling; (3) first filling thick mud at the bottom of the hole, then loading a p32mm rock emulsion explosive, installing a non-electric delay detonator, and filling wet clay in a remaining section at the top of the hole; (4) setting a hole-by-hole millisecond-delayed blasting network in series and parallel connection; and (5) setting a blasting warning at each intersection, evacuating equipment, personnel and an animal to a safe distance of 200 m, issuing an alert, and detonating after confirming safety, checking after 15 min of blasting so as to eliminate any danger, and clearing the alert upon a confirmation of no danger.
The holes are arranged in a plum blossom pattern, with a spacing of 3.0 m between holes, a spacing of 3.5 m between rows and a depth of 3-4 m. 1 m deep thick mud is first filled at the bottom of the hole, then 1-1.5 m deep (p32 mm rock emulsion explosive is loaded, and wet clay is filled in the remaining section at the top of the hole. A non-electric delay detonator is installed; the millisecond-delayed blasting network has a delay interval of 110 ms between rows and a delay interval of 50 ms between holes. The present disclosure has the following beneficial effects. 1. The present disclosure adopts ultra-deep hole blasting, which achieves an average daily excavation volume of 8000-10000 M 3 , effectively accelerating the construction progress. 2. The present disclosure adopts blasting with millisecond delays between rows, between holes and within the hole, which effectively reduces the vibration velocity (a measured vibration velocity V is smaller than or equal to 5 cm/s). 3. The present disclosure applies thick mud and wet clay, which effectively absorb blasting energy, reduce blasting vibration and reflection and absorb shock waves. The measured vibration velocity V is smaller than or equal to 2. 5cm/s in a high-speed railway tunnel. 4. The present disclosure adopts vibration-controlled blasting by filling thick mud and wet clay at the bottom and top of the hole respectively, which replaces the static blasting technology, greatly improving the construction progress and relieving the pressure on construction period. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 shows a layout of a hole-by-hole millisecond-delayed blasting network. FIG. 2 shows a layout of a blasting method by filling thick mud at the bottom and wet clay at the top. FIG. 3 shows a schematic diagram of charging by filling thick mud at the bottom and wet clay at the top. DETAILED DESCRIPTION As shown in FIG. 1, the present disclosure provides a method for large-scale blasting with triple millisecond delays by loading an explosive in three sections separated by a stone powder in an ultra-deep blast hole. The method specifically includes the following steps: (1) Build an access road, level an entire top blasting surface, and carry out tangential construction on two benches. (2) Drill holes simultaneously with four crawler-type down-the-hole drilling rigs in the left and right, where the drilling rig is provided with a diesel air compressor, and a drill bit has a diameter of plOO; an area within 1.5 m around the hole is cleaned to prevent the hole from being blocked and the drilling rig from being stuck; the holes are arranged in a plum blossom pattern, with a spacing of 3.5 m between holes, a spacing of 4.0 m between rows and a depth of 10 m; four rows of holes are drilled per cycle, with 9 holes in each row and 36 holes in each cycle. (3) Clean the hole by the air compressor after drilling. (4) Load a p70 mm rock emulsion explosive in sections separated by a stone powder, and install a non-electric delay detonator, where explosive cartridges in bottom, middle and upper sections are respectively 2.5 m, 1.5 m and 1.0 m deep; the stone powder in each section is 1.5 m deep; wet clay is filled in a remaining section at the top of the hole. (5) Set a hole-by hole millisecond-delayed blasting network in series and parallel connection, where the millisecond-delayed blasting network has a delay interval of 110 ms between rows, a delay interval of 50 ms between holes and a delay interval of 460 ms within the hole. (6) Set a blasting warning at each intersection, evacuate equipment, personnel and an animal to a safe distance of 200 m, and ensure operators all wear helmets. (7) Implement a chain shooting system composed of a blaster, a squad leader and a security officer, where the security officer is responsible for issuing an alert, and the squad leader is responsible for command; after the squad leader confirms safety and issues a firing command, the blaster warns with a loudspeaker or a whistle and then fires after confirming safety; check after 15 min of blasting so as to eliminate any danger, and clear the alert upon a confirmation of no danger. The present disclosure provides a method for vibration-controlled blasting by filling thick mud at the bottom of a blast hole and filling wet clay at the top thereof, as shown in FIGS. 2 and 3. The method specifically includes the following steps: (1) Drill holes with a crawler-type down-the-hole drilling rig, where the drilling rig is provided with a diesel air compressor, and a drill bit has a diameter of P42; an area within 1.5 m around the hole is cleaned to prevent the hole from being blocked and the drilling rig from being stuck; the holes are arranged in a plum blossom pattern, with a spacing of 3.0 m between holes, a spacing of 3.5 m between rows and a depth of 3-4 m. (2) Clean the hole by the air compressor after drilling. (3) First fill 1 m deep thick mud at the bottom of the hole, then load 1-1.5 m deep (p32 mm rock emulsion explosive, install a non-electric delay detonator, and fill wet clay in a remaining section at the top of the hole. (4) Set a hole-by-hole millisecond-delayed blasting network in series and parallel connection, where the millisecond-delayed blasting network has a delay interval of 110 ms between rows and a delay interval of 50 ms between holes. (5) Set a blasting warning at each intersection, evacuate equipment, personnel and an animal to a safe distance of 200 m, and ensure operators all wear helmets. (6) Implement a chain shooting system composed of a blaster, a squad leader and a security officer, where the security officer is responsible for issuing an alert, and the squad leader is responsible for command; after the squad leader confirms safety and issues a firing command, the blaster warns with a loudspeaker or a whistle and then fires after confirming safety; check after 15 min of blasting so as to eliminate any danger, and clear the alert upon a confirmation of no danger.
Claims (5)
- What is claimed is: 1. A method for large-scale blasting with triple millisecond delays by loading an explosive in three sections separated by a stone powder in an ultra-deep blast hole, comprising the following steps: (1) building an access road, leveling a top blasting surface, and carrying out tangential construction on two benches; (2) drilling holes simultaneously with four crawler-type down-the-hole drilling rigs in the left and right, wherein the drilling rig is provided with a diesel air compressor, and a drill bit has a diameter of <plOO; an area within 1.5 m around the hole is cleaned; (3) cleaning the hole after drilling; (4) loading a (p70mm rock emulsion explosive in sections separated by a stone powder, and installing a non-electric delay detonator; (5) setting a hole-by-hole millisecond-delayed blasting network in series and parallel connection; and (6) evacuating equipment, personnel and an animal to a safe distance of 200 m, issuing an alert, and detonating after confirming safety; checking after 15 min of blasting so as to eliminate any danger, and clearing the alert upon a confirmation of no danger.
- 2. The method for large-scale blasting with triple millisecond delays by loading an explosive in three sections separated by a stone powder in an ultra-deep blast hole according to claim 1, wherein the holes are arranged in a plum blossom pattern, with a spacing of 3.5 m between holes, a spacing of 4.0 m between rows and a depth of 8-10 m; four rows of holes are drilled per cycle, with 9 holes in each row.
- 3. The method for large-scale blasting with triple millisecond delays by loading an explosive in three sections separated by a stone powder in an ultra-deep blast hole according to claim 1, wherein explosive cartridges in bottom, middle and upper sections are respectively 2.5 m, 1.5 m and 1.0 m deep; the stone powder in each section is 1.5 m deep; wet clay is filled in a remaining section at the top of the hole; wherein the millisecond-delayed blasting network has a delay interval of 110 ms between rows, a delay interval of 50 ms between holes and a delay interval of 460 ms within the hole.
- 4. A method for vibration-controlled blasting by filling thick mud at the bottom of a blast hole and filling wet clay at the top thereof, comprising the following steps: (1) drilling holes with a crawler-type down-the-hole drilling rig, wherein the drilling rig is provided with a diesel air compressor, and a drill bit has a diameter of (p42; an area within 1.5 m around the hole is cleaned; (2) cleaning the hole after drilling; (3) first filling thick mud at the bottom of the hole, then loading a (p32mm rock emulsion explosive, installing a non-electric delay detonator, and filling wet clay in a remaining section at the top of the hole; (4) setting a hole-by hole millisecond-delayed blasting network in series and parallel connection; and (5) setting a blasting warning at each intersection, evacuating equipment, personnel and an animal to a safe distance of 200 m, issuing an alert, and detonating after confirming safety; checking after 15 min of blasting so as to eliminate any danger, and clearing the alert upon a confirmation of no danger.
- 5. The method for vibration-controlled blasting by filling thick mud at the bottom of a blast hole and filling wet clay at the top thereof according to claim 5, wherein the holes are arranged in a plum blossom pattern, with a spacing of 3.0 m between holes, a spacing of 3.5 m between rows and a depth of 3-4 m; wherein 1 m deep thick mud is first filled at the bottom of the hole, then 1 1.5 m deep (p32 mm rock emulsion explosive is loaded, and wet clay is filled in the remaining section at the top of the hole; wherein a non-electric delay detonator is installed; the millisecond-delayed blasting network has a delay interval of 110 ms between rows and a delay interval of 50 ms between holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2021102017A AU2021102017A4 (en) | 2021-04-19 | 2021-04-19 | Method for large-scale blasting with triple millisecond delays by loading explosive in three sections separated by stone powder in ultra-deep blast hole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2021102017A AU2021102017A4 (en) | 2021-04-19 | 2021-04-19 | Method for large-scale blasting with triple millisecond delays by loading explosive in three sections separated by stone powder in ultra-deep blast hole |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2021102017A4 true AU2021102017A4 (en) | 2021-06-10 |
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ID=76215473
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2021102017A Ceased AU2021102017A4 (en) | 2021-04-19 | 2021-04-19 | Method for large-scale blasting with triple millisecond delays by loading explosive in three sections separated by stone powder in ultra-deep blast hole |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU2021102017A4 (en) |
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2021
- 2021-04-19 AU AU2021102017A patent/AU2021102017A4/en not_active Ceased
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FGI | Letters patent sealed or granted (innovation patent) | ||
| MK22 | Patent ceased section 143a(d), or expired - non payment of renewal fee or expiry |