AU2021104668A4 - Three-dimensional mud-pressure blasting method for strengthening straight-hole comprehensive spiral deep-hole cutting in hard rock double-row and same-depth wedge-shaped blind area in railway double-track tunnel - Google Patents

Three-dimensional mud-pressure blasting method for strengthening straight-hole comprehensive spiral deep-hole cutting in hard rock double-row and same-depth wedge-shaped blind area in railway double-track tunnel Download PDF

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Publication number
AU2021104668A4
AU2021104668A4 AU2021104668A AU2021104668A AU2021104668A4 AU 2021104668 A4 AU2021104668 A4 AU 2021104668A4 AU 2021104668 A AU2021104668 A AU 2021104668A AU 2021104668 A AU2021104668 A AU 2021104668A AU 2021104668 A4 AU2021104668 A4 AU 2021104668A4
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Australia
Prior art keywords
hole
cutting
double
depth
mud
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AU2021104668A
Inventor
Wenquan Cao
Xiaojian Gao
Xiangping Zhang
Xin Zhang
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China Railway 18th Bureau Group Co Ltd
China State Railway Group Co Ltd
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China Railway 18th Bureau Group Co Ltd
China State Railway Group Co Ltd
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42AMMUNITION; BLASTING
    • F42DBLASTING
    • F42D3/00Particular applications of blasting techniques
    • F42D3/04Particular applications of blasting techniques for rock blasting
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/006Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries by making use of blasting methods
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42AMMUNITION; BLASTING
    • F42DBLASTING
    • F42D1/00Blasting methods or apparatus, e.g. loading or tamping
    • F42D1/08Tamping methods; Methods for loading boreholes with explosives; Apparatus therefor
    • F42D1/22Methods for holding or positioning for blasting cartridges or tamping cartridges
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42AMMUNITION; BLASTING
    • F42DBLASTING
    • F42D1/00Blasting methods or apparatus, e.g. loading or tamping
    • F42D1/08Tamping methods; Methods for loading boreholes with explosives; Apparatus therefor
    • F42D1/20Tamping cartridges, i.e. cartridges containing tamping material

Abstract

Disclosed is a three-dimensional mud-pressure blasting method for strengthening straight-hole comprehensive spiral deep-hole cutting in hard rock double-row and same-depth wedge-shaped blind area in railway double-track tunnel, said method relates to technical field of tunnel construction, comprising steps as blasthole location, hole drilling, blasthole cleaning, charging and blasting, etc.; this invention realizes deep hole blasting, speeds up construction progress, increases economic benefits, and forms a benign working cycle. DRAWINGS 26 F4 F41 F15 Z2102 Z12 Z1 l i 1 1 F 2 ZSo F3 F4 F5 F22 35 F4 F3 1 2 F3 F3F1 25 V4 F F40 F4 To T F63F F20 2U M~ 0 0T s F4 F1 FW1F2 2 BT3 Z32 F0 0 0 0 0 00 02 Z2 F70 M F6B F67 F65 F64 Z33 z1 FIG.1 1 45 0 (F) (F) (F) (T) (T) (BT) (T) (BT) (T) (T) FIG.2 1

Description

DRAWINGS
Z12 Z1 l i 1 1 F 2
ZSo F3 F4 F5 F22 35 F4 F3 1 2 F3 F3F1 25
26 F4 F41 F15 Z2102 V4 F F40 F4 To T F63F F20 2U M~ 0s 0T BT3 2 Z32 F4 F1 FW1F2
F0 Z2 F70 M F6B 0 0 F67 0 F65 0 F64 00 02 Z33
z1
FIG.1
1
450
(F) (F) (F) (T) (T) (BT) (T) (BT) (T) (T)
FIG.2
SPECIFICATION THREE-DIMENSIONAL MUD-PRESSURE BLASTING METHOD FOR STRENGTHENING STRAIGHT-HOLE COMPREHENSIVE SPIRAL DEEP-HOLE CUTTING IN HARD ROCK DOUBLE-ROW AND SAME-DEPTH WEDGE-SHAPED BLIND AREA IN RAILWAY DOUBLE-TRACK TUNNEL TECHNICAL FIELD
[0001] This invention relates to the technical field of tunnel construction, in particular
to a three-dimensional mud-pressure blasting method for strengthening straight-hole
comprehensive spiral deep-hole cutting in hard rock double-row and same-depth
wedge-shaped blind area in railway double-track tunnel.
BACKGROUNDOFTHETECHNOLOGY
[0002] Disadvantages of existing tunnel construction methods are as follow:
[0003] Cutting undermine angle is too small, and the inclination is too large; when the
depth is too short; satellite hole, resulting in poor blasting efficiency, low footage, and
many large rocks.
[0004] Since the angle of said cutting undermine is too small, distance between the
cutting undermine and the bottom of the first circle of satellite hole is too large,
resulting in a blind area of the cut resulting in many residual holes, low blast hole
utilization, low natural footage, and poor smooth blasting effect after blasting.
SUMMARY OF THE INVENTION
[0005] This invention aims to provide a three-dimensional mud-pressure blasting
method for strengthening straight-hole comprehensive spiral deep-hole cutting in hard
rock double-row and same-depth wedge-shaped blind area in railway double-track
tunnel to solve said problems.
SPECIFICATION
[0006] In order to achieve said objectives, this invention provides the following solutions: a three-dimensional mud-pressure blasting method for strengthening straight-hole comprehensive spiral deep-hole cutting in hard rock double-row and same-depth wedge-shaped blind area in railway double-track tunnel comprises steps as follow:
[0007] Si. After spraying the concrete, set up total station, and point out the position of blasthole to be excavated on the rock according to the size of the cross section of the upper tunnel;
[0008] S2. Move the excavation trolley to the tunnel face to stabilize and level it, and place the overhauled hand-held pneumatic rock drill, 3-meter and 5-meter long drill rod with drill bit;
[0009] S3. According to the pre-design, determine the area, personnel, and the number of blasthole;
[0010] S4. After finishing all said blastholes, clean said blastholes, and pack said pneumatic rock drill, drill rods with drill bits, and high-pressure rubber windbelt;
[0011] S5. Transport gun heads made in a safe place to the three-layer platform of the tunnel face and the trolley; charge the excavated blast holes;
[0012] S6. Adopt full-section ascending steps blasting method to set off the shot, and ventilate for 15 minutes after the shot is set off.
[0013] Said blasthole comprises peripheral hole, satellite hole, cutting undermine, cutting fixing and bottom hole.
[0014] Said cutting undermine is in shape of wedge and it is set with two circles to form a double-step wedge cutting undermines with the same depth.
[0015] Depth of said cutting undermine, cutting fixing and bottom hole in the S3 is 4.8 meters; depth of said satellite hole and peripheral hole is 4.5 meters; make 134 blastholes per cycle.
SPECIFICATION
[0016] Hole sweeper is connected to high-pressure windpipe mentioned in the S4 to
clean said blasthole.
[0017] Said cutting undermine, cutting fixing, satellite hole and bottom hole
mentioned in the S5 all adopt positive continuous charge structure; explosives are
installed at the bottom of the blasthole.
[0018] Remaining blastholes are all blocked with blasting mud; peripheral hole
mentioned in the S5 are made of bamboo pieces, tied with a section of explosive
every 150mm; said gun head is placed on the outermost; adopt positive spaced charge;
put 2 parts of water cannon mud into the orifice and seal it completely.
[0019] Said explosive is No. 2 rock emulsion explosive with a specification of 5
32mm X 300mm X 300g, and the blasting distance is 260mm.
[0020] Use ham sausage shaped bag with diameter of 5 35mm X 300mm; bag the
reconciled clay thick slurry and use short aluminum wire to tie the mouth of the bag to
make thick slurry.
[0021] Beneficial effect of this invention:
[0022] This invention adopts the double-step same-depth wedge-shaped blind zone to
strengthen the straight-eye comprehensive three-dimensional blasting method of the
deep hole cutting of the melon breaking type, which greatly improves the blasting
footage;
[0023] Process and use ham sausage shaped thick slurry blasting mud, and use
bamboo chips to realize the explosive blasting of the peripheral hole air column
interval charge; it saves explosives;
[0024] Cutting undermine, satellite hole and bottom hole realize mud pressure
blasting.
DESCRIPTION OF THE DRAWING
[0025] FIG. 1 is the layout of the excavated blasthole of this invention;
SPECIFICATION
[0026] FIG. 2 is the depth diagram of the blasthole excavated in this invention;
[0027] FIG.3 is the sectional view of A-A in FIG. 1;
[0028] As shown in the drawings, 1. tunnel face, 2. cutting blind area, 3. tunnel
centerline, T. cutting undermine, BT. cutting fixing, F. satellite hole, Z. peripheral hole,
D. bottom hole.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0029] A three-dimensional mud-pressure blasting method for strengthening
straight-hole comprehensive spiral deep-hole cutting in hard rock double-row and
same-depth wedge-shaped blind area in railway double-track tunnel comprises steps
as follow:
[0030] Si. After spraying the concrete, set up total station; mark the elevation and
center line of the tunnel on the tunnel face; use red paint to mark the surrounding hole
positions, the first circle of satellite holes, two circles of wedge cutting undermines,
and the positions of the cutting fixings on the rock according to the size of the cross
section of the upper step of the tunnel;
[0031] S2. Move the excavation trolley to the tunnel face to stabilize and level it, and
place the overhauled hand-held pneumatic rock drill, 3-meter and 5-meter long drill
rod with drill bit;
[0032] S3. Determine the area, personnel, and the number of blasthole; depth of said
cutting undermine, cutting fixing and bottom hole is 4.8 meters; make 134 blastholes
per cycle;
[0033] S4. After drilling all blastholes, connect hole sweeper to the high-pressure air
pipe to blow out all the water, debris, rock dust, mud, etc. in said blastholes;
[0034] S5. Transport gun heads made in a safe place to the three-layer platform of the
tunnel face and the trolley; said cutting undermine, cutting fixing, satellite hole and
SPECIFICATION
bottom hole mentioned in the S5 all adopt positive continuous charge structure;
explosives are installed at the bottom of the blasthole; remaining blastholes are all
blocked with blasting mud; in the first circle of cutting undermine, first install 3
explosives, install 1 gun head, and then install two parts of gun mud, then install 3
explosives, and then install 1 gun head of the same segment number, and then use gun
mud to block it; peripheral holes are made of bamboo pieces, tied with a section of
explosive every 150mm (said explosive is No. 2 rock emulsion explosive with a
specificationof 4532mmX300mmX300g, and the blasting distance is 260mm);
[0035] S6. Adopt full-section ascending steps blasting method to set off the shot;
withdraw the equipment to the safety boundary; distance between the personnel to
avoid the explosive is not less than 200 meters; turning chamber is 75 meters, and
then the explosive is fired.
[0036] Utility of double-stage same-depth wedge-shaped cuts, "melon-breaking type"
comprehensive cut blasting, compared with double-stage different-deep wedge cuts
and simple double-stage same-depth wedge cuts, said blasting effect is improved by
%-50%.
[0037] Use ham sausage shaped bag with diameter of 5 35mmX300mm; reconciled
clay thick slurry is mechanically packed and the bag mouth is tied with short
aluminum wire to make thick mud and gun mud.
[0038] cutting undermine, cutting fixing, satellite hole, peripheral hole and bottom
hole are all used for concentrated charge at the bottom of the hole, and the remaining
length of the blasthole is all sealed with "blasting mud" with a diameter of 5 35mm
X 300mm.
[0039] Said first circle of the cutting undermine is equipped with two gun heads of the
same segment number, with two parts of mud in the middle spaced between them;
explosion is relatively uniform and the rock mass of the cut blasting is reduced.
[0040] Parameter design of mud-pressure blasting for deep hole cutting with broken
SPECIFICATION
gourd is shown in the following table:
Charge SraIudlinat Dept Dislan Quantity Detonator Seraa e Numb IinDe t D it Resista Mud Section Initiation Connection Num Name er io(Deg t e Cartrid Bag Se Sequence Mode ber roe) (i) (mm) ge Kg Number Number TI- Cntei 10 90,80 4.8 8 24.0 8 1/2 /I T10 undermine 10 01204. BT1- Cutting 4 90 4.8 600 600 6 7.2 10 2 II flT4 fixing F1- Satellite 700/890 900/100 147. 3/5 III/IV F70 hole 70 90 4 0 0 0 Large parallel Zi- Peripheral 34 91 4.5 600 800 5 51.0 6 7 V Z34 bale DI Bottm 16 93 4.8 800/90 800/900 8 38.4 8 9 VI D1.6 hale 0
Total 134 267. 6
[0041] Original conditions and blasting effects of mud-pressure blasting with comprehensive deep hole cutting cut are shown in the following table:
Serial Name Uni Numbe Note Serial Name Unit Number Note numb t r number er I Rock firness f 6-10 Mitiddle U Drill rod type Hollow hexagonal steel with diameter of e28mm; two coefficient hardrock types of length of 30/5.0 meters 2 Rock property Sandstone, slate, phyllite 12 Explosive type No. 2 rock emulsion explosive with a specification of schist, tuf rhyolite, dacite, p32mm x300nmx300g etc 3 Sectional area of 60.0 13 Detonator model Non electric milisecond delay detonatorwith detonating cord length of 7.0 meters 4 Empty hole 0 14 Charge structure Positive continuous charge structure number 5 Effective hole 134 15 Left blasthole sealing Mud bag with diameter of i35mm x 300mm number structure 6 Explosive Kg 267.6 16 Initiation mode Fire detonator charge amount per cycle 7 Detonator 134+1 17 Solid rock blasting per us 246 number per cycle cycle 8 Drilling depth m 4.5 18 Footage per shot In 4.2 < 4.4 meters
9 Drilling diameterofe35mm 19 llastholeutilization % 93.3 <97.7 specification 10 Drill bit type diameter of p38mm; linear 20 Uniteplosive Kg/ 1.08 shape consumption
[0042] In said embodiment, a double-row, same-depth, wedge-shaped blind zone is used to strengthen the straight-hole comprehensive deep-hole cutting mud pressure blasting method; make 134 effective blastholes per cycle; said cutting undermine, cutting fixing and bottom hole is 4.8 meters; depth for other blastholes is 4.5 meters; total weight of explosives is 267.6 Kg; each shot has footage of 3.6-4.4 meters, an average of 4.2 meters, an average blasthole utilization rate of 93.3%, and a unit
SPECIFICATION
consumption of 1.08Kg/m3; footage per shot is 1.8 to 3.4 times higher than the
original 1.2 to 2.2 meters.
[0043] In this specification, embodiment is used to explain the principle and
implementation of this invention; description of the above embodiment is only used to
help understand the method of this invention and its core ideas; according to the idea
of this invention, there will be changes in the specific implementation and the scope
of application; in summary, content of this specification should not be construed as a
limitation to this invention.

Claims (5)

1.A three-dimensional mud-pressure blasting method for strengthening
straight-hole comprehensive spiral deep-hole cutting in hard rock double-row and
same-depth wedge-shaped blind area in railway double-track tunnel is characterized
in that, steps are introduced as follow:
Si. After spraying the concrete, set up total station, and point out the position of
blasthole to be excavated on the rock according to the size of the cross section of the
upper tunnel;
S2. Move the excavation trolley to the tunnel face to stabilize and level it, and place
the overhauled hand-held pneumatic rock drill, 3-meter and 5-meter long drill rod
with drill bit;
S3. According to the pre-design, determine the area, personnel, and the number of
blasthole;
S4. After finishing all said blastholes, clean said blastholes, and pack said
pneumatic rock drill, drill rods with drill bits, and high-pressure rubber windbelt;
S5. Transport gun heads made in a safe place to the three-layer platform of the
tunnel face and the trolley; charge the excavated blast holes;
S6. Adopt full-section ascending steps blasting method to set off the shot, and
ventilate for 15 minutes after the shot is set off.
2.A three-dimensional mud-pressure blasting method for strengthening
straight-hole comprehensive spiral deep-hole cutting in hard rock double-row and
same-depth wedge-shaped blind area in railway double-track tunnel as claimed in
claim 1, wherein said blasthole comprises peripheral hole, satellite hole, cutting
undermine, cutting fixing and bottom hole; said cutting undermine is in shape of
wedge and it is set with two circles to form a double-step wedge cutting undermines
with the same depth; depth of said cutting undermine, cutting fixing and bottom hole
in the S3 is 4.8 meters; depth of said satellite hole and peripheral hole is 4.5 meters;
make 134 blastholes per cycle.
3.A three-dimensional mud-pressure blasting method for strengthening
straight-hole comprehensive spiral deep-hole cutting in hard rock double-row and
same-depth wedge-shaped blind area in railway double-track tunnel as claimed in
claim 2, wherein hole sweeper is connected to high-pressure windpipe mentioned in
the S4 to clean said blasthole.
4.A three-dimensional mud-pressure blasting method for strengthening
straight-hole comprehensive spiral deep-hole cutting in hard rock double-row and
same-depth wedge-shaped blind area in railway double-track tunnel as claimed in
claim 3, wherein said cutting undermine, cutting fixing, satellite hole and bottom hole
mentioned in the S5 all adopt positive continuous charge structure; explosives are
installed at the bottom of the blasthole; remaining blastholes are all blocked with
blasting mud; peripheral hole mentioned in the S5 are made of bamboo pieces, tied
with a section of explosive every 150mm; said gun head is placed on the outermost;
adopt positive spaced charge; put 2 parts of water cannon mud into the orifice and
seal it completely.
5.A three-dimensional mud-pressure blasting method for strengthening
straight-hole comprehensive spiral deep-hole cutting in hard rock double-row and
same-depth wedge-shaped blind area in railway double-track tunnel as claimed in
claim 4, wherein said explosive is No. 2 rock emulsion explosive with a specification
of 5 32mm X 300mm X 300g, and the blasting distance is 260mm; use ham sausage
shaped bag with diameter of 5 35mm X 300mm; bag the reconciled clay thick slurry
and use short aluminum wire to tie the mouth of the bag to make thick slurry.
AU2021104668A 2021-07-28 2021-07-28 Three-dimensional mud-pressure blasting method for strengthening straight-hole comprehensive spiral deep-hole cutting in hard rock double-row and same-depth wedge-shaped blind area in railway double-track tunnel Active AU2021104668A4 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2021104668A AU2021104668A4 (en) 2021-07-28 2021-07-28 Three-dimensional mud-pressure blasting method for strengthening straight-hole comprehensive spiral deep-hole cutting in hard rock double-row and same-depth wedge-shaped blind area in railway double-track tunnel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AU2021104668A AU2021104668A4 (en) 2021-07-28 2021-07-28 Three-dimensional mud-pressure blasting method for strengthening straight-hole comprehensive spiral deep-hole cutting in hard rock double-row and same-depth wedge-shaped blind area in railway double-track tunnel

Publications (1)

Publication Number Publication Date
AU2021104668A4 true AU2021104668A4 (en) 2021-10-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
AU2021104668A Active AU2021104668A4 (en) 2021-07-28 2021-07-28 Three-dimensional mud-pressure blasting method for strengthening straight-hole comprehensive spiral deep-hole cutting in hard rock double-row and same-depth wedge-shaped blind area in railway double-track tunnel

Country Status (1)

Country Link
AU (1) AU2021104668A4 (en)

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