CN104747075B - Anti-collapsing drilling method for grout spraying of soft coal seam - Google Patents

Anti-collapsing drilling method for grout spraying of soft coal seam Download PDF

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CN104747075B
CN104747075B CN201510084270.XA CN201510084270A CN104747075B CN 104747075 B CN104747075 B CN 104747075B CN 201510084270 A CN201510084270 A CN 201510084270A CN 104747075 B CN104747075 B CN 104747075B
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drilling
slurry
slurries
layer
drilling rod
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CN104747075A (en
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李定启
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Henan University of Technology
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Henan University of Technology
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00Special methods or apparatus for drilling
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/10Sealing or packing boreholes or wells in the borehole
    • E21B33/13Methods or devices for cementing, for plugging holes, crevices, or the like

Abstract

An anti-collapsing drilling method for grout spraying of a soft coal seam includes the following steps that first, an anti-collapsing drilling device for grout spraying of the soft coal seam is machined and tested; second, technological parameters of the anti-collapsing drilling device for grout spraying are designed; third, hole reinforcing grout is prepared, and the solidification property of the grout is tested; fourth, the anti-collapsing drilling device for grout spraying of the soft coal seam is installed; fifth, anti-collapsing drilling for grout spraying is performed; sixth, drilling stops till the designed depth is achieved, clean water is used for cleaning a grout spraying pipeline and a spray nozzle, and a drill stem and a drill bit are withdrawn. Due to the adoption of the method, the efficiency for drilling bedding holes in the soft coal seam is substantially improved, the hole forming rate for drilling holes in 100 meters is substantially increased, and time for drilling the bedding holes in the soft coal seam is shortened; the gas drainage efficiency of the bedding holes in the soft coal seam is substantially improved, and time for gas pre-drainage of the soft coal seam is greatly shortened; the probability that gas exceeds the limit is greatly reduced in the tunneling and stoping period, and valuable time and a safety guarantee are provided for safe and efficient stoping and tunneling of a coal mine.

Description

The weak seam anti-collapse drilling method of whitewashing
Technical field
The invention belongs to Safety of Coal Mine Production technical field and in particular to a kind of weak seam whitewash anti-collapse drilling method.
Background technology
On October 16th, 2011 is by State Administration of Quality and Technical Supervision, the National Development and Reform Commission, national energy Source office, national Coal Mine Safety Supervision Bureau fill (2011) No. 163 with the total coal of safety supervision and print and distribute " coal mine gas drainage temporary provisions up to standard " The mine having one of following situations must carry out gas pumping, and it is up to standard to realize extraction: (one) exploitation has coal and gas prominent to endanger Dangerous coal seam;(2) coal-face absolute gas emission rates are more than the absolute gas of 5m/min or driving face Outburst amount is more than 3m/min's;(3) mine absolute gas emission rate is more than or equal to 40m/min's;(4) mine annual production is 1.0~1.5mt, its absolute gas emission rate is more than 30m/min's;(5) mine annual production is 0.6~1.0mt, its absolute watt This outburst amount is more than 25m/min's;(6) mine annual production is 0.4~0.6mt, and its absolute gas emission rate is more than 20m/min 's;(7) mine annual production is equal to or less than 0.4mt, and its absolute gas emission rate is more than 15m/min's.
Because China's tectonic soft coal is widely distributed, gas bearing capacity is higher, needs to carry out region gas pre-drainage during exploitation.At present Non-protruding coal-bed gas are taken out in advance and mainly adopt concordant to hole, but easy collapse hole, card when tectonic soft coal region construction concordant hole Bore, fall to bore, drilling construction difficulty is larger, and meanwhile, after pore-forming, easy collapse hole blocks, and drill mash gas efficiency is low.For reducing cherry coal Collapse hole, mainly adopts setting of casing guard aperture technology, including technology such as setting of casings in pipe-following drilling, drilling rod just at present.In addition with brill Well liquid guard aperture technology.These soft seam guard aperture technology existing all have some limitations.
Existing pipe-following drilling guard aperture technology
Pipe-following drilling technology is the sleeve pipe being connected below using drill bit traction, and synchronously completing during realizing drilling is trapped Pipe, drilling terminates after-contraction drill bit, and drill bit and drilling rod are withdrawn from from sleeve pipe.Pipe-following drilling technology is mainly used in ground work at present The broken ground drilling application of journey geology field, and it is mainly theoretical research in cherry coal drilling field, down-hole practical implementation is relatively Few.The subject matter existing in down-hole application is that hole drilling deslagging space is little, sleeve pipe easily by locking it is difficult to realize whole setting of casing Guard aperture, major diameter sleeve pipe is relatively costly simultaneously.
Setting of casing guard aperture technology in drilling rod
In drilling rod, setting of casing guard aperture technology can open drill bit using middle part and larger interior diameter drilling rod is crept into, and terminates recession Drill bit and drilling rod a small distance, small diameter sleeve pipe are inserted into fixing in boring from drilling rod and drill bit, then by drill bit and brill Boring withdrawn from by bar.In drilling rod, setting of casing guard aperture technology is during the subject matter that down-hole application exists can not solve to drill Collapse hole, bit freezing problem, casing diameter is less simultaneously, limited by drainage efficient.
Drilling fluid guard aperture technology
Drilling fluid (former title mud) refers to working fluid used in drilling well.It can be liquid or gas.Therefore, drilling well Liquid should definitely be referred to as drilling fluid.In drilling process, the circulation flushing medium that in the hole uses.Also known as drilling fluid.Drilling well Liquid can be divided into clear water, mud, free clay phase flushing liquor, emulsion, foam and compressed air etc. by constituent.Clear water is to use Earliest drilling fluid, need not be processed, easy to use it is adaptable to complete rock stratum and the area having abundant water resources.Mud is to widely use Drilling fluid, be primarily adapted for use in loose, cranny development, easy collapsing and breaking, water-swellable and the hole wall unstable formation such as peel off.Drilling well The anti-collapse hole of liquid is mainly used in ground and vertically creeps into, limited for horizontal well and down-hole horizontal boring anti sloughing effectiveness.
Content of the invention
The present invention, in order to solve weak point of the prior art, provides a kind of weak seam anti-collapse drilling method of whitewashing. The main purpose of the method is to carry out whitewashing drilling by grouting pump and rig, forms one layer of coagulation in the wall of a borehole in drilling process Soil and accelerator mixed serum, simultaneously pulsed water jet interval inject in the wall of a borehole slurry layer, formed in the wall of a borehole slurry layer Air-vent, reaches the anti-collapse purpose of boring, reduces the impact to the wall of a borehole gas permeability simultaneously to greatest extent.The present invention realizes soft seam The anti-collapse drilling of concordant gas extraction hole, improves drilling efficiency, improves gas drainage under suction efficiency, shortens gas drainage under suction time, maximum Limit eliminates Gas Disaster.
For solving above-mentioned technical problem, the present invention adopts the following technical scheme that the weak seam anti-collapse drilling method of whitewashing, bag Include following steps:
(1), process and test the weak seam anti-collapse drilling apparatus of whitewashing;
(2), the anti-collapse drilling technology parameter designing of whitewashing;
(3), prepare solid hole slurries, test grout cures performance;
(4), the weak seam anti-collapse drilling apparatus of whitewashing are installed;
(5), carry out anti-collapse drilling of whitewashing;
(6), stop drilling to projected depth, using clean water whitewashing pipeline and nozzle, withdraw from rod bit.
In described step (1), weak seam whitewashes anti-collapse drilling apparatus using three wings alloy bit, and chisel edge connects slurry Nozzle for liquid and pulse jet nozzle;The drilling rod that the anti-collapse drilling apparatus of weak seam whitewashing adopt is by internal layer drilling rod and outer layer drilling rod group Become, internal layer drilling rod adopts sheet steel pipe or plastic tube;It is fixedly connected using support chip between internal layer drilling rod and outer layer drilling rod;Drilling rod it Between the flat button that is connected by connect, the circular passage being formed between outer layer drilling rod and internal layer drilling rod is used for water flowing, deslagging and perforation, It is axially arranged with for the slurry channels by concrete and accelerator slurries inside internal layer drilling rod.
In described step (2), anti-collapse drilling technology parameter of whitewashing mainly includes slurries presetting period, grouting pressure, whitewashing Thickness, grout cures intensity, jet pressure, perforation diameter, perforation spacing, rate of penetration;
1. the slurries presetting period
The slurries presetting period is mixed with accelerator to preliminary condensation required time t1 for concrete, and the slurries presetting period should omit More than concrete and accelerator mixed serum flowing time t2 in drilling rod;When grouting pressure is constant, t2 is with drilling depth Increase and increase;For remaining that slightly t1 is more than t2, should incrementally increase grouting pressure, to increase stream in drilling rod for the slurries Speed, t2 keeps stable;
2. grouting pressure
In nozzle diameter one timing, slurries flowing velocity in drilling rod increases with grouting pressure and increases;Long with drilling rod The increase of degree, the lengthening distance of slurries flowing, for keeping stable slurry flowing time in drilling rod, need to incrementally increase slip casting pressure Power;
3. shotcrete thickness
Slurries thickness has considerable influence to boring solid hole intensity, and different shotcrete thickness have not to drill bit structure and type With requirement;When being closed when three wings gold drill bit creeps into it is desirable to shotcrete thickness is less than 0.5mm using common, slurry configurations concentration is less, Mainly pass through to penetrate into borehole wall surfaces, by borehole wall surfaces loose coal grain bonding and reinforcement;When using larger shotcrete thickness, enhancing When slurry layer is to the wall of a borehole supporting intensity, needs to increase concentration of slurry, and adopt collapsible drill bit, so that the energy in grout cures Enough in boring, withdraw from drill bit;
4. grout cures intensity
Grout cures intensity includes initial setting strength and final set strength;Slurry layer should have certain initial setting strength, so that energy Prevent boring loose coal during drilling from standing like a wall scaling-off or being caving;Final set strength should be as big as possible, to strengthen slurry layer pair as far as possible The wall of a borehole later stage, supporting intensity later stage;
5. pulsed interruption water jet pressure
Because before slurry layer initial set, intensity is relatively low, in 3-6mp, low water jet can be between the wall of a borehole slurry layer pulsed Cut off the water supply jet pore-forming, simultaneously in low water jet be used for creeping into deslagging;
6. perforation diameter and spacing
Perforation diameter should be moderate with spacing, if perforation diameter is excessive, spacing is too small, then lead to slurry layer supporting intensity big Width declines;If perforation diameter is too small, spacing is excessive, then lead to boring gas permeability to substantially reduce;The boring of external diameter 75mm, perforation A diameter of 3-6mm;Perforation spacing is related to rate of penetration and rod rotation speed, and rate of penetration is less, rod rotation speed is bigger, between perforation Away from less, under the conditions of keeping reasonable drilling efficiency, perforation spacing general control is in 10-20mm scope.
In described step (3), solid hole slurries adopt concrete slurry, accelerator, debugging concrete slurry and accelerator Adding proportion is so that mix rear slurry presetting period 1-5min, final setting time 5-10min.Mixed when spraying thin layer slurries guard aperture Solidifying soil paste liquid adopts cement grout or the sub- mixed serum of cement fine sand;When spraying thick-layer slurries guard aperture, concrete slurry adopts water Mud and coarse sand mixed serum.Accelerator adopts aluminate class accelerator, for wet mixing gunite concrete guard aperture layer, common dose one As for concrete amount 2.5%~5.5%.
Described aluminate class accelerator is sodium aluminate or potassium aluminate.
In described step (4), install rig, drilling rod and drill bit, two joints covering by the rotatory sealing of drilling rod end Connect grouting pump and pulsed water pump respectively;In drilling rod connection procedure, need, by twining unsintered tape in internal layer tool joint, to strengthen Internal layer drilling rod connection sealing.
In described step (5), start grouting pump and pulsed water pump carries out whitewashing drilling, concrete slurry and accelerator exist Sprayed by slurry nozzle after mixing in slurries shower nozzle, form a layer concrete and accelerator slurries in the wall of a borehole;Slurries spray Pulsed jet nozzle on rear side of mouth, in the wall of a borehole slurry layer intermittent jet, forms a series of air-vents in the wall of a borehole.
Using technique scheme, the present invention is distinguished as with other prior art being close:
1) difference with existing pipe-following drilling guard aperture technology
Pipe-following drilling technology is to carry out whole guard aperture using sleeve pipe, and the subject matter existing in down-hole application is hole drilling deslagging Space is little, drilling efficiency is low, sleeve pipe easily by locking it is difficult to realize whole setting of casing guard aperture, major diameter sleeve pipe cost is relatively simultaneously High.Whitewashing drilling guard aperture technology can improve original drilling efficiency and drill mash gas efficiency, and technique is simpler, and cost is relatively low.
2) difference with setting of casing guard aperture technology in drilling rod
In drilling rod setting of casing guard aperture technology using minor diameter sleeve pipe guard aperture it is impossible to solve drill during collapse hole, bit freezing Problem, is drilled and can not be carried out with setting of casing simultaneously, efficiency is low, and casing diameter is less, limited by drainage efficient simultaneously.Whitewashing drilling shield The synchronization that hole technology realization is drilled with guard aperture, technique is simpler, and efficiency high can improve original drilling efficiency and drilling gas simultaneously Drainage efficient.
3) difference with existing drilling fluid guard aperture technology
Drilling fluid is primarily adapted for use in the unstable rocks of hole wall such as loose, cranny development, easy collapsing and breaking, water-swellable peel off Layer.Drilling fluid anti-sloughing hole is mainly used in ground and vertically creeps into, limited for horizontal well and down-hole horizontal boring anti sloughing effectiveness.Spray Slurry drilling guard aperture technology realizes soft seam horizontal drilling drilling and guard aperture, the wall of a borehole gas permeability is affected less, drilling efficiency is high, Drill mash gas efficiency can be improved.
The present invention by grouting pump and rig carry out whitewashing drilling, in drilling process the wall of a borehole formed a layer concrete and Accelerator mixed serum, reaches the anti-collapse purpose of boring, and pulsed water jet interval is injected in the wall of a borehole slurry layer simultaneously, in boring Wall slurry layer forms air-vent, reduces the impact to the wall of a borehole gas permeability for the slurry layer to greatest extent.Soft seam concordant hole of the present invention Drilling efficiency and gas drainage under suction efficiency high, process is simple, low cost.The present invention realizes the anti-collapse of soft seam concordant gas extraction hole Drilling, improves drilling efficiency, improves gas drainage under suction efficiency, shorten the gas drainage under suction time, eliminate Gas Disaster to greatest extent.This The bright down-hole soft seam concordant hole that is widely portable to efficiently is crept into and the efficient extraction of gas.
The present invention can greatly increase soft seam concordant hole drilling efficiency and gas drainage under suction efficiency.Down-hole the results showed, Being whitewashed using soft seam creeps into after guard aperture technology, and soft seam concordant hole drilling efficiency improves more than 30%, and hundred meters of Completion of Drilling Hole rates carry High by more than 40%, soft seam concordant hole gas drainage under suction efficiency improves more than 45%, and spent time, manpower and material resources are less than existing There is 50% needed for setting of casing guard aperture technology, simultaneously also below the time spent by other soft seam concordants drilling guard aperture technology, people Power and material resources.Being whitewashed using soft seam creeps into after guard aperture technology, and soft seam concordant hole drilling efficiency and hundred meters of Completion of Drilling Hole rates are big Width improves, and shortens the soft seam concordant hole engineering time;Soft seam concordant hole gas drainage under suction efficiency is greatly improved, and greatly reduces The soft seam gas pre-drainage time;So that the gas exceeding limit probability during driving and back production is greatly reduced, be safety of coal mines high winning technology, Driving provides quality time and safety guarantee.
Brief description
Fig. 1 is the structural representation of the anti-collapse drilling apparatus of weak seam whitewashing in the present invention.
Specific embodiment
The weak seam anti-collapse drilling method of whitewashing of the present invention, comprises the following steps:
(1), process and test the weak seam anti-collapse drilling apparatus of whitewashing.
As shown in figure 1,1 is outer layer drilling rod, 2 is intake tunnel, and 3 is tool joint, and 4 is support chip, and 5 is internal layer drilling rod, 6 For slurry channels, 7 is pulse jet nozzle, and 8 is slurry nozzle, and 9 is deslagging limbers, and 10 is drill bit leading portion drill, 11 be into Slurry pipe, 12 is water inlet pipe, and 13 is rotation seal joint.
In drilling process, drilling rod connects pulp-inlet pipe 11 and water inlet pipe 12, pulp-inlet pipe 11 respectively by rotation seal joint 13 Connect slurries pump and Pulsed Jet Pump with water inlet pipe 12 respectively.
Soft seam whitewashes anti-collapse drilling apparatus using three wings alloy bit, and chisel edge connects slurry nozzle 8 and pulse is penetrated Flow nozzle 7;The drilling rod that the anti-collapse drilling apparatus of weak seam whitewashing adopt is made up of internal layer drilling rod 5 and outer layer drilling rod 1, internal layer drilling rod 5 adopt sheet steel pipe or plastic tube;It is fixedly connected using support chip 4 between internal layer drilling rod 5 and outer layer drilling rod 1;Company between drilling rod Connect and (tool joint 3) is connected using flat button, the circular passage being formed between outer layer drilling rod 1 and internal layer drilling rod 5 is used for water flowing, deslagging With perforation (deslagging limbers 9), it is axially arranged with for the slurry channels by concrete and accelerator slurries inside internal layer drilling rod 5 6.
(2), the anti-collapse drilling technology parameter designing of whitewashing
It is strong that anti-collapse drilling technology parameter of whitewashing mainly includes slurries presetting period, grouting pressure, shotcrete thickness, grout cures Degree, jet pressure, perforation diameter, perforation spacing, rate of penetration.
1. the liquid presetting period
The liquid presetting period is mixed with accelerator to preliminary condensation required time t1 for concrete, and the presetting period should be slightly bigger than mixed Solidifying soil and accelerator mixed serum flowing time t2 in drilling rod.When grouting pressure is constant, t2 is with the increase of drilling depth And increase, for remaining that omiting t1 is more than t2, should incrementally increase grouting pressure, to increase flow velocity in drilling rod for the slurries, t2 protects It is fixed to keep steady.
2. grouting pressure
In nozzle diameter one timing, slurries flowing velocity in drilling rod increases with grouting pressure and increases.Long with drilling rod The increase of degree, the lengthening distance of slurries flowing, for keeping stable slurry flowing time in drilling rod, need to incrementally increase slip casting pressure Power.
3. shotcrete thickness
Slurries thickness has considerable influence to boring solid hole intensity, and different shotcrete thickness have not to drill bit structure and type With requirement.When being closed when three wings gold drill bit creeps into it is desirable to shotcrete thickness is less than 0.5mm using common, slurry configurations concentration is less, Mainly pass through to penetrate into borehole wall surfaces, by borehole wall surfaces loose coal grain bonding and reinforcement.When using larger shotcrete thickness, enhancing When slurry layer is to the wall of a borehole supporting intensity, needs to increase concentration of slurry, and adopt collapsible drill bit, so that the energy in grout cures Enough in boring, withdraw from drill bit.
4. grout cures intensity
Grout cures intensity includes initial setting strength and final set strength.Slurry layer should have certain initial setting strength, so that energy Prevent boring loose coal during drilling from standing like a wall scaling-off or being caving.Final set strength should be as big as possible, to strengthen slurry layer pair as far as possible The wall of a borehole later stage, supporting intensity later stage.
5. pulsed interruption water jet pressure
Due to slurry layer initial set before intensity relatively low, in low water jet (3-6mp) can be between the wall of a borehole slurry layer pulsed Cut off the water supply jet pore-forming, simultaneously in low water jet be used for creeping into deslagging.
6. perforation diameter and spacing
Perforation diameter should be moderate with spacing, if perforation diameter is excessive, spacing is too small, then lead to slurry layer supporting intensity big Width declines.If perforation diameter is too small, spacing is excessive, then lead to boring gas permeability to substantially reduce.Therefore, the brill of external diameter 75mm Hole, perforation diameter 3-6mm;Perforation spacing is related to rate of penetration and rod rotation speed, and rate of penetration is less, rod rotation speed is bigger, Perforation spacing is less, and under the conditions of keeping reasonable drilling efficiency, perforation spacing general control is in 10-20mm scope.
(3), prepare solid hole slurries, test grout cures performance.
Solid hole slurries adopt concrete slurry, accelerator, and the adding proportion of debugging concrete slurry and accelerator is so that mix Close rear slurry presetting period 1-5min, final setting time 5-10min.When spraying thin layer slurries guard aperture, concrete slurry adopts cement Slurries or the sub- mixed serum of cement fine sand;When spraying thick-layer slurries guard aperture, concrete slurry adopts cement and coarse sand mixing slurry Liquid.Accelerator adopts aluminate class accelerator, usually sodium aluminate or potassium aluminate, for wet mixing gunite concrete guard aperture layer, often It is generally the 2.5%~5.5% of concrete amount with dosage.
(4), the weak seam anti-collapse drilling apparatus of whitewashing are installed.
Install grouting pump, pulsed water pump, connecting line, rig, drilling rod and drill bit, connect by the rotatory sealing of drilling rod end Head connects grouting pump and pulsed water pump.In drilling rod connection procedure, need, by twining unsintered tape in internal layer tool joint, to strengthen interior Layer drilling rod 5 connection sealing.
(5), carry out anti-collapse drilling of whitewashing.
Start grouting pump and pulsed water pump carries out whitewashing drilling, concrete slurry and accelerator mix in slurries shower nozzle Sprayed by slurry nozzle after uniformly, form a layer concrete and accelerator slurries in the wall of a borehole;Pulsed on rear side of slurry nozzle Jet nozzle, in the wall of a borehole slurry layer intermittent jet, forms a series of air-vents in the wall of a borehole.
(6), stop drilling to projected depth, using clean water whitewashing pipeline and nozzle, withdraw from rod bit.
Above example is only in order to illustrative and not limiting technical scheme, although reference above-described embodiment is to this Bright be described in detail, it will be understood by those within the art that: still the present invention can be modified or wait With replacing, any modification or partial replacement without departing from the spirit and scope of the present invention, it all should cover the power in the present invention In the middle of sharp claimed range.

Claims (9)

1. weak seam whitewash anti-collapse drilling method it is characterised in that: comprise the following steps:
(1), process and test the weak seam anti-collapse drilling apparatus of whitewashing;
(2), the anti-collapse drilling technology parameter designing of whitewashing;
(3), prepare solid hole slurries, test grout cures performance;
(4), the weak seam anti-collapse drilling apparatus of whitewashing are installed;
(5), carry out anti-collapse drilling of whitewashing;
(6), stop drilling to projected depth, using clean water whitewashing pipeline and nozzle, withdraw from rod bit.
2. weak seam according to claim 1 whitewash anti-collapse drilling method it is characterised in that: pine in described step (1) Soft seam whitewashes anti-collapse drilling apparatus using three wings alloy bit, and chisel edge connects slurry nozzle and pulse jet nozzle;Pine The drilling rod that the soft seam anti-collapse drilling apparatus of whitewashing adopt is made up of internal layer drilling rod and outer layer drilling rod, internal layer drilling rod adopt sheet steel pipe or Plastic tube;It is fixedly connected using support chip between internal layer drilling rod and outer layer drilling rod;The flat button that is connected by between drilling rod connects, outward The circular passage being formed between layer drilling rod and internal layer drilling rod is used for water flowing, deslagging and perforation, is axially arranged with use inside internal layer drilling rod In the slurry channels by concrete and accelerator slurries.
3. weak seam according to claim 2 whitewash anti-collapse drilling method it is characterised in that: in described step (2), spray Starch anti-collapse drilling technology parameter and mainly include slurries presetting period, grouting pressure, shotcrete thickness, grout cures intensity, jet pressure Power, perforation diameter, perforation spacing, rate of penetration;
1. the slurries presetting period
The slurries presetting period is mixed with accelerator to preliminary condensation required time t1 for concrete, and the slurries presetting period should be slightly bigger than Concrete and accelerator mixed serum flowing time t2 in drilling rod;When grouting pressure is constant, t2 is with the increasing of drilling depth Plus and increase;For remaining that slightly t1 is more than t2, should incrementally increase grouting pressure, to increase flow velocity in drilling rod for the slurries, t2 Keep stable;
2. grouting pressure
In nozzle diameter one timing, slurries flowing velocity in drilling rod increases with grouting pressure and increases;With run of steel Increase, the lengthening distance of slurries flowing, for keeping stable slurry flowing time in drilling rod, need to incrementally increase grouting pressure;
3. shotcrete thickness
Slurries thickness has considerable influence to boring solid hole intensity, and different shotcrete thickness have different wanting to drill bit structure and type Ask;When being closed when three wings gold drill bit creeps into it is desirable to shotcrete thickness is less than 0.5mm using common, slurry configurations concentration is less, mainly It is by penetrating into borehole wall surfaces, by borehole wall surfaces loose coal grain bonding and reinforcement;When using larger shotcrete thickness, enhancing slurries When layer is to the wall of a borehole supporting intensity, needs to increase concentration of slurry, and adopt collapsible drill bit, so that can be from grout cures Drill bit is withdrawn from boring;
4. grout cures intensity
Grout cures intensity includes initial setting strength and final set strength;Slurry layer should have certain initial setting strength, to prevent During drilling, boring loose coal stands like a wall scaling-off or is caving;Final set strength should be as big as possible, to strengthen slurry layer as far as possible to the later stage The wall of a borehole later stage supporting intensity;
5. pulsed interruption water jet pressure
Because before slurry layer initial set, intensity is relatively low, in 3-6mp, low water jet can be cut off the water supply between the wall of a borehole slurry layer pulsed Jet pore-forming, simultaneously in low water jet be used for creeping into deslagging;
6. perforation diameter and spacing
Perforation diameter should be moderate with spacing, if perforation diameter is excessive, spacing is too small, then lead to slurry layer supporting intensity significantly under Fall;If perforation diameter is too small, spacing is excessive, then lead to boring gas permeability to substantially reduce;The boring of external diameter 75mm, perforation diameter For 3-6mm;Perforation spacing is related to rate of penetration and rod rotation speed, and rate of penetration is less, rod rotation speed is bigger, and perforation spacing is got over Little, under the conditions of keeping reasonable drilling efficiency, perforation spacing general control is in 10-20mm scope.
4. weak seam according to claim 1 whitewash anti-collapse drilling method it is characterised in that: in described step (3), Gu Hole slurries adopt concrete slurry, accelerator, and the adding proportion of debugging concrete slurry and accelerator is so that mix at the beginning of rear slurry Solidifying time 1-5min, final setting time 5-10min.
5. weak seam according to claim 1 whitewash anti-collapse drilling method it is characterised in that: in described step (3), when During injection thin layer slurries guard aperture, concrete slurry adopts cement grout or the sub- mixed serum of cement fine sand;When injection thick-layer slurries shield During hole, concrete slurry adopts cement and coarse sand mixed serum.
6. weak seam according to claim 4 whitewash anti-collapse drilling method it is characterised in that: described accelerator adopts aluminium Barbiturates accelerator, for wet mixing gunite concrete guard aperture layer, common dose is generally the 2.5%~5.5% of concrete amount.
7. weak seam according to claim 6 whitewash anti-collapse drilling method it is characterised in that: described aluminate class rapid hardening Agent is sodium aluminate or potassium aluminate.
8. weak seam according to claim 4 whitewash anti-collapse drilling method it is characterised in that: in described step (4), peace If rig, drilling rod and drill bit, connect grouting pump and pulsed water respectively by two joints that the rotatory sealing of drilling rod end covers Pump;In drilling rod connection procedure, need, by twining unsintered tape in internal layer tool joint, to strengthen internal layer drilling rod connection sealing.
9. weak seam according to claim 5 whitewash anti-collapse drilling method it is characterised in that: in described step (5), open Dynamic grouting pump and pulsed water pump carry out whitewashing drilling, concrete slurry and accelerator mix in slurries shower nozzle after by starching Nozzle for liquid sprays, and forms a layer concrete and accelerator slurries in the wall of a borehole;Pulsed jet nozzle on rear side of slurry nozzle exists The wall of a borehole slurry layer intermittent jet, forms a series of air-vents in the wall of a borehole.
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