CN205532593U - Big section multiple seam tunnel tunnelling is with preventing abrupt measure effect tube sample boring arrangement structure - Google Patents
Big section multiple seam tunnel tunnelling is with preventing abrupt measure effect tube sample boring arrangement structure Download PDFInfo
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- CN205532593U CN205532593U CN201620193997.1U CN201620193997U CN205532593U CN 205532593 U CN205532593 U CN 205532593U CN 201620193997 U CN201620193997 U CN 201620193997U CN 205532593 U CN205532593 U CN 205532593U
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Abstract
The utility model discloses a big section multiple seam tunnel tunnelling is with preventing abrupt measure effect tube sample boring arrangement structure, the tube sample boring establish by a plurality of pass through that taking out in advance of two at least coal seams adopt that the drilling distal end forms take out adopt the control area in, the tube sample boring includes a plurality of first tube sample borings and a plurality of second tube sample boring, do not wait to take off the coal seam to every creeps into the several to first tube sample boring in the minimum perpendicular distance 10m punishment in tunnel tunnelling to first coal seam, distal end two at least in the first tube sample boring of several is located takes out the 2m within range of adopting the control area edge, first tube sample boring is used for the totality in two at least coal seams to prevent abrupt validity check, the minimum perpendicular distance 3m department in coal seam is waited to take off to waiting that it creeps into to take off the coal seam at tunnel tunnelling to every by the second tube sample boring, and the second tube sample boring is used for waiting taking off the coal seam and takes off the abrupt validity check of preventing before the coal. The beneficial effects of the utility model are that, can effectively reduce the tube sample boring and prepare time scalar sum measuring number of times, the efficiency of construction is high, and the tunnel tunnelling time limit for a project is short, and tunnels safety.
Description
Technical field
This utility model relates to a kind of big cross section multiple seam tunnel piercing technology, and particularly a kind of big cross section multiple seam tunnel piercing is used
Outburst prevention measures effect tube sample boring arrangement.
Background technology
Along with the development of China's communication, the situation containing build tunnel, gas stratum of passing through gets more and more, high methane tunnel quantity
Also it is being continuously increased.Although the gas tunnel of current domestic construction is many based on high methane, but there is Gas Outburst, have gas to dash forward
The less of elephant occur, the general way using conventional coal mine roadway driving, construction speed is low, and the duration is longer.And at constructing tunnel
During, coal-bed gas Predicting Technique specific aim is strong, and outburst prevention measures optimizes not, outburst prevention measures inspection can inadequate by property,
Have a strong impact on construction safety and progress, increase construction cost, even result in constructing tunnel gas explosion accident.According to not exclusively system
Meter, there are ear vcehicular tunnel, a Wumeng Shan Mountain railway tunnel etc. in the domestic coal dangerous tunnel prominent with gas that include, but are formed the most completely
The process of a set of constructing tunnel of dashing forward about coal and gas, external gas tunnel construction referential experience is less.For guaranteeing tunnel
The safety of coal tunneling process is worn in road, should take necessity, reliable outburst prevention measures, and Predicting Gas to be carried out works.Gas
It is the prerequisite that determines of outburst prevention measures scheme, is also the important means of inspection outburst prevention measures effect.Although Predicting Gas means
Become ripe, but sampling drainage holes arrangement has directly affected and predicted the outcome.
Summary of the invention
The purpose of this utility model is for the deficiencies in the prior art, it is provided that a kind of big cross section multiple seam tunnel piercing outburst prevention measures
Effect tube sample boring arrangement, with Accurate Prediction coal seam gas-bearing capacity and gas pressure, it is ensured that the reliability of outburst prevention measures and
The safety of tunnel piercing.
For achieving the above object, this utility model adopts the following technical scheme that
A kind of big cross section multiple seam tunnel piercing outburst prevention measures effect tube sample boring arrangement, tube sample boring is located to be worn by multiple
In the extraction control area that more the pre-extraction borehole far-end at least two coal seam is formed, tube sample boring includes multiple first tube sample boring
With multiple second tube sample borings, the first tube sample boring tunnel piercing at minimum perpendicular distance 10m of first coal seam respectively to each
Drilling in coal to be taken off is several, and the far-end of at least two in several first tube sample borings is positioned at the 2m model at edge, extraction control area
In enclosing, the first tube sample boring is for the overall verifying outburst prevention effect at least two coal seam；Second tube sample boring in tunnel piercing to often
Individual treat at exposed coal layer minimum perpendicular distance 3m to drilling in coal to be taken off, second tube sample boring protrusion-dispelling before treating exposed coal layer exposed coal
Validity check.
Use this utility model of technique scheme, in the first coal seam minimum vertical of tunnel piercing at least two contiguous seams
Distance 10m arranges the first tube sample boring, and the first tube sample boring is several to each drilling in coal to be taken off respectively, several first samplings
In the range of the far-end of at least two in boring is positioned at the 2m at edge, described extraction control area, with to overall outburst prevention measures effect
Inspection, in order to next step continues to take overall outburst prevention measures or tunneling construction, with traditional hierarchical prediction, layered shaping, layering
Outburst prevention measures validity check is compared, and effectively reduces tube sample boring preparation number of times and detection number of times, significantly improves construction effect
Rate, shortens the tunnel piercing duration.Meanwhile, treat to arrange at exposed coal layer 3m the second tube sample boring, and carry out again protrusion-dispelling effect
Fruit inspection, accurately to obtain the overall gas bearing capacity in multiple coal seams and pressure prediction result, can effectively guarantee exposed coal in tunnel piercing
The safety of high-risk section.Wherein, adjacent when exposed coal interlamellar spacing is less, drill through when position selects and wait that taking off every layer is considered as by multiple
One coal seam, the second tube sample boring is respectively to adjacent multiple drilling in coals.
Preferably, the aperture of described first tube sample boring is 89mm；The first tube sample boring quantity in described each coal seam is 9,
Upper, middle and lower three row that 9 the first tube sample borings press tunnel cross-section is uniform, 3 often arranged by each 1 distribution in left, center, right, wherein,
In the range of the far-end of 1 the first tube sample boring laying respectively at about lower row two jiaos is positioned at the 2m at edge, described extraction control area.
Larger-diameter drill bit is used to creep into the first tube sample boring, the requirement the deepest to adapt to drilling depth, make to creep into smoothly and take
The unimpeded requirement of sample boring, and obtained the prediction data at edges of regions position by the thief hole at edge, extraction control area, under
Offer reliable prediction data are carried out in one step work.
Preferably, the aperture of described second tube sample boring is 65mm, and the second tube sample boring is located at that two be completed are adjacent pre-to be taken out
In the middle of borehole, multiple second tube sample boring far-ends formed sampling region above tunnel excavation control wheel profile not less than 5m,
Lower section is not less than 3m, left and right all not less than 5m, and multiple second tube sample borings are matrix arrangements.It has been to use relatively at Approaching Coal Seam
The drill bit of minor diameter creeps into the second tube sample boring, creeps into smoothly and while the unimpeded requirement of tube sample boring meeting, and minimizing is crept into
During danger；Meanwhile, in conjunction with rational bore arrangement mode and scope, it is ensured that sampling reliability and the accuracy of prediction.
Preferably, it is additionally included in tunnel piercing and treats at exposed coal layer minimum perpendicular distance 5m at least many to drilling in coal to be taken off to setting
Individual aperture is the 3rd tube sample boring of 75mm, and the 3rd tube sample boring is located in the middle of the adjacent pre-extraction borehole of two be completed, many
The sampling region that individual 3rd tube sample boring far-end is formed is not less than not less than 10m, lower section above tunnel excavation control wheel profile
5m, left and right are all not less than 9m；Multiple 3rd tube sample borings are matrix arrangements.With three protrusion-dispelling pick test before formation exposed coal,
Further ensure that the safety of tunnel piercing.Wherein, adjacent when exposed coal interlamellar spacing is less, drill through multiple when position selects
Waiting that taking off every layer is considered as a coal seam, the 3rd tube sample boring is respectively to adjacent multiple drilling in coals.
Preferably, being additionally included at the ort after being opened by exposed coal layer the 4th tube sample boring being provided for ort prediction, the 4th takes
The aperture of sample boring is 42mm, and the 4th tube sample boring is set to the concordant hole in coal seam, place, and what the 4th tube sample boring far-end was formed takes
Sample region above tunnel excavation control wheel profile, lower section and left and right be all not less than 3m；Multiple 4th tube sample boring radially cloth
Put.To be again sampled inspection after opening coal seam, it is ensured that tunnel safety in the tunneling process of coal seam.
This utility model compared with prior art provides the benefit that, is effectively reduced tube sample boring preparation number of times and detection time
Number, efficiency of construction significantly improves, and the tunnel piercing duration is short, and tunnel piercing safety.
Accompanying drawing explanation
Fig. 1 is that application is of the present utility model passes through each digital well logging structural representation that multiple seam tunnel is determined by exploration data.
Fig. 2 is that before applying in multiple seam tunnel piercing of the present utility model first at K9 coal seam, prospecting bit hole is arranged and is perpendicular to tunnel
The positive facade structural representation of tunneling direction.
Fig. 3 is that before applying in multiple seam tunnel piercing of the present utility model first at K9 coal seam, prospecting bit hole is arranged along tunnel piercing
The horizontal plane perspective view in direction.
Fig. 4 is that before applying in multiple seam tunnel piercing of the present utility model first at K3 coal seam, prospecting bit hole is arranged and is perpendicular to tunnel
The positive facade structural representation of tunneling direction.
Fig. 5 is that before applying in multiple seam tunnel piercing of the present utility model first at K3 coal seam, prospecting bit hole is arranged along tunnel piercing
The horizontal plane perspective view in direction.
Fig. 6 is that before applying in multiple seam tunnel piercing of the present utility model second at K9 and K3 coal seam, prospecting bit hole is arranged and is perpendicular to
The positive facade structural representation in tunnel piercing direction.
Fig. 7 is that before applying in multiple seam tunnel piercing of the present utility model second at K9 and K3 coal seam, prospecting bit hole is arranged along tunnel
The horizontal plane perspective view of tunneling direction.
Fig. 8 is that before applying in multiple seam tunnel piercing of the present utility model second at K9 and K3 coal seam, prospecting bit hole is arranged along tunnel
Facade projection's schematic diagram of tunneling direction.
Fig. 9 is that the first tube sample boring 3 far-end in this utility model is being perpendicular to facade projection's schematic diagram in tunnel piercing direction.
Figure 10 is that the 3rd tube sample boring 5 far-end in this utility model is being perpendicular to facade projection's schematic diagram in tunnel piercing direction.
Figure 11 is that the second tube sample boring 4 far-end in this utility model is being perpendicular to facade projection's schematic diagram in tunnel piercing direction.
Figure 12 is the facade projection that the 4th tube sample boring 7 arranged by ort in this utility model is perpendicular to tunnel piercing direction
Schematic diagram.
Figure 13 be in this utility model the 4th tube sample boring 7 along the floor projection schematic diagram in tunnel piercing direction.
Detailed description of the invention
Below in conjunction with the accompanying drawings this utility model is further described, but the most therefore this utility model is limited in described reality
Execute among scope.
See Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, a kind of in big cross section multiple seam tunnel piercing
Big cross section multiple seam tunnel piercing outburst prevention measures effect tube sample boring arrangement, passes through K1～K9 totally 9 coal seams in certain design
Tunnel excavating process in, see Fig. 1 by K1～the K9 digital well logging of geological exploration result and spacing, wherein thickness and spacing list
Position is m.When tunnel front is excavated at K9 coal seam and k3 roof minimum perpendicular distance 20m, along tunnel direction of advance
And construct respectively 3 Φ 76mm with coal seam vertical direction, it is first advanced that hole depth penetrates K9～K4 coal seam and K3～K1 coal seam respectively
Visit coal borer hole A1, A2, A3 and A4, A5, A6.Execute each coal seam of itemized record during brill see the coal point degree of depth, coal seam thickness,
With or without situations such as abnormal phenomena such as spray orifices；In order to tentatively to verify gas bearing situation and the geological state of tunnel coal measure strata；
At tunnel excavation work surface to during away from K9 and K3 roof minimum perpendicular distance 10m, respectively the most at least construction 3 second is advanced
Boring B1, B2, B3 and B4, B5, B6, the second advance borehole aperture Φ 89mm, 3 the second advance boreholes by 1 uphole and
2 lateral opening compositions of level, uphole is used for detection of coal seam inclination angle, and 2 levels are lateral opening for detection of coal seam trend.Second advance borehole
Penetrating coal seam the thickest, and enter people's floor strata not less than 0.5m, it is left that its borehole bottom location should control to control the outer 5m of profile at tunnel excavation
The right side, and take core or the coal core in each coal seam, analyze occurrence (trend, inclination angle, tendency) and top, the base plate lithology in coal seam.
Grasp the ocurrence of coal seam situations such as the layer position in coal seam, inclination angle, thickness, roof and floor lithologic, geological structure with definite, and then be safety
Exposed coal provides reliable basic data.When second advance borehole B1, B2, B3, B4, B5 or B6 construction is to each roof,
Immediately exit from Φ 89mm drill bit, be replaced with corer and take out each Seam Roof And Floor and the rock in coal seam or coal core, and perform itemized record.
By sample analysis obtain K9～K1 coal seam average digital well logging be respectively 0.94m, 0.82m, 0.71m, 0m, 2.60m, 1.65
m、0.1m、1.21m、0.35m；K9 Yu K8 coal seam spacing be 1.87m, K8 and K7 coal seam spacing be 2.41m, K7 and K5
Coal seam spacing be 13.3m, K5 and K4 coal seam spacing be 0.7m, K4 and K3 coal seam spacing be 7.49m, K3 and K2 coal seam spacing
It is 6.95m for 25.72m, K2 and K1 coal seam spacing.
By all coal seams passed are sampled, DGC rapid measurement device for gas content is used to measure the original gas bearing capacity in coal seam,
Inverse gas pressure；Use WFC-2 type gas diffusion initial speed automatic analyzer, smash cylinder, hopper, sky equality instrument pair to pieces
Δ P, f value is measured；And Failure type to coal seam is analyzed in location of the coring procedure.To determine that whether work area, place is as gas
Prominent work area.With specific reference to the related request of " super-long railway tunnel technical specification ", as long as gas tunnel has at one prominent danger
Danger, at this, the work area at place is Gas Outburst work area.It is judged to that Gas Outburst must meet following 4 indexs simultaneously: (1) gas
Pressure P >=0.74MPa；(2) gas diffusion initial speed △ P >=10；(3) solid coefficient f≤0.5 of coal；(4) destruction of coal
Type be III class and more than.In judge process, owing to the gas pressure measurement cycle is longer, according to " preventing and treating coal and gas prominent rule
Requirement calmly ", takes to survey the data such as gas bearing capacity and industrialness analysis result and carrys out inverse gas pressure.Obtain K9, K5,
K4 and K2 is projecting coal bed, and remaining is non-protruding coal seam.
Seeing Fig. 9, Figure 10, Figure 11, Figure 12, Figure 13, wherein, tube sample boring is located at and is passed through at least two coal seam by multiple designs
Pre-extraction borehole 1 far-end formed extraction control area 2 in.Tube sample boring includes that multiple first tube sample boring 3 and multiple second takes
Sample boring 4, the first tube sample boring 3 overall verifying outburst prevention effect at least two coal seam to be traversed, its aperture is 89mm；The
Two tube sample borings 4 verifying outburst prevention effect before treating exposed coal layer exposed coal, the aperture of its second tube sample boring 4 is 65mm.
First run sampling is carried out when tunnel piercing to K9 coal seam, executes brill at minimum perpendicular distance 10m of tunnel piercing to K9 coal seam
First tube sample boring 3 of the first run, this first tube sample boring 3 each drilling in coal 9 in K9, K8, K7 and K6 respectively, 9
Upper, middle and lower three row that first tube sample boring 3 presses tunnel cross-section is uniform, and 3 often arranged are by each 1 distribution in left, center, right, wherein, and position respectively
In the range of in about lower row, the far-end of 1 first tube sample boring 3 of two jiaos is positioned at the 2m at edge, extraction control area 2, the of epicycle
Two tube sample borings 4, divide to treating at minimum perpendicular distance 3m of K9, K8, K7, K6, K5 and K4 of exposed coal layer in tunnel piercing
Not treating that exposed coal layer K9, K8, K7, K6, K5 and K4 creep into correspondence, it is adjacent that the second tube sample boring 4 is located at two be completed
In the middle of pre-extraction borehole 1, the sampling region that multiple second tube sample boring 4 far-ends in each coal seam are formed controls profile away from tunnel excavation
Not less than 5m, lower section not less than 3m, left and right all not less than 5m above line, multiple second tube sample borings 4 in each coal seam are in matrix
Arrange；Wherein, through detection K6 be non-coal seam, it is not necessary to carry out 3 meters hang down away from place sampling.
Wherein, in tunnel piercing to treating at K9 minimum perpendicular distance 5m of exposed coal layer, respectively to K9, K8 and K7 coal seam (this
K9, K8 and K7 are considered as same treating exposed coal layer by place, and K6 is non-coal seam) creep into the epicycle the 3rd that multiple aperture is 75mm
Tube sample boring 5；3rd tube sample boring 5 is located in the middle of the adjacent pre-extraction borehole 1 of two be completed, multiple the of each coal seam
The sampling region that three tube sample boring 5 far-ends are formed is not less than 10m above tunnel excavation control wheel profile, lower section is not less than 5m,
Left and right is all not less than 9m；Multiple 3rd tube sample borings 5 in each coal seam are in matrix arrangements.
Second takes turns sampling prediction is carried out when tunnel piercing to K5 coal seam, when tunnel piercing is to minimum perpendicular distance 10m in K5 coal seam
Place executes bores second the first tube sample boring 3 of taking turns, this first tube sample boring 3 each drilling in coal 9 in K5 and K4 respectively, 9 the
Upper, middle and lower three row that one tube sample boring 3 presses tunnel cross-section is uniform, and 3 often arranged, by each 1 distribution in left, center, right, wherein, lay respectively at
In the range of about lower row, the far-end of 1 first tube sample boring 3 of two jiaos is positioned at the 2m at edge, extraction control area 2, the first auger
Hole 3 is for the overall verifying outburst prevention effect in two coal seams of K5 and K4 to be traversed；The aperture of the second tube sample boring 4 of epicycle is 65mm,
Second tube sample boring 4 tunnel piercing to treat exposed coal layer K5 minimum perpendicular distance 3m at due to K5 Yu K4 spacing 0.7m, herein
Being considered as same exposed coal layer for the treatment of, treat that exposed coal layer K5 and K4 creeps into correspondence respectively, the second tube sample boring 4 is located at two be completed
In the middle of adjacent pre-extraction borehole 1, the sampling region that multiple second tube sample boring 4 far-ends in each coal seam are formed is away from tunnel excavation control
Above contour line not less than 5m, lower section not less than 3m, left and right all not less than 5m, multiple second tube sample borings 4 in each coal seam in
Matrix arrangements.
Wherein, in tunnel piercing to treating at minimum perpendicular distance 5m of exposed coal layer K5 and K4, respectively to K and K4 coal seam drilling
Entering the 3rd tube sample boring 5 of the epicycle that multiple aperture is 75mm, the 3rd tube sample boring 5 is located at that two be completed are adjacent pre-to be taken out
In the middle of borehole 1, the sampling region that multiple 3rd tube sample boring 5 far-ends in each coal seam are formed is away from tunnel excavation control wheel profile
Top is not less than 5m, left and right all not less than 9m not less than 10m, lower section；Multiple 3rd tube sample borings 5 in each coal seam are in square
Battle array is arranged.
Third round sampling prediction is carried out when tunnel piercing to K3 coal seam, at tunnel piercing to K3 coal seam minimum perpendicular distance 10m
Executing the first tube sample boring 3 boring third round, this first tube sample boring 3 respectively creeps into 9 to tri-coal seams of K3, K2 and K1 respectively, and 9
Upper, middle and lower three row that individual first tube sample boring 3 presses tunnel cross-section is uniform, and 3 often arranged are by each 1 distribution in left, center, right, wherein, respectively
In the range of the far-end of 1 the first tube sample boring 3 being positioned at about lower row two jiaos is positioned at the 2m at edge, extraction control area 2；Epicycle
Second tube sample boring 4 respectively in tunnel piercing to treating at minimum perpendicular distance 3m of exposed coal layer K3, K2 and K1, treat to correspondence respectively
Taking off drilling in coal, the second tube sample boring 4 is located in the middle of the adjacent pre-extraction borehole 1 of two be completed, multiple the second of each coal seam
The sampling region that tube sample boring 4 far-end is formed is not less than 3m, left and right not less than 5m, lower section above tunnel excavation control wheel profile
All not less than 5m, multiple second tube sample borings 4 in each coal seam are in matrix arrangements.
Tunnel piercing to the K2 treating exposed coal layer minimum perpendicular distance 5m (K3 thinning is seam, K1 with K2 is close together,
Processing by same coal seam herein) place creeps into the 3rd tube sample boring 5 of the epicycle that multiple aperture is 75mm to K2 and K1, and the 3rd
Tube sample boring 5 is located in the middle of the adjacent pre-extraction borehole 1 of two be completed, multiple 3rd tube sample boring 5 far-ends in each coal seam
The sampling region formed is not less than 5m, left and right all not less than 9m not less than 10m, lower section above tunnel excavation control wheel profile；
Multiple 3rd tube sample borings 5 in each coal seam are in matrix arrangements.
Due to K9, can 5, K4 and K2 be projecting coal bed, therefore, the coal after being opened by exposed coal layer of K9, K5, K4 and K2
Also needing to be provided for the 4th tube sample boring 7 of ort prediction at Men, the aperture of the 4th tube sample boring 7 is 42mm, the 4th tube sample boring
The 7 concordant holes being set to coal seam, place 6, the sampling region that the 4th tube sample boring 7 far-end is formed is on tunnel excavation control wheel profile
Side, lower section and left and right are all not less than 3m；Multiple 4th tube sample borings 7 are radially arranged.
Although combining accompanying drawing above to describe embodiment of the present utility model, but those of ordinary skill in the art can also anticipating
Knowing to in scope of the following claims, various changes can be made or amendment, these modifications and variations are understood as in this practicality new
Within the scope of type and intention.
Claims (5)
1. a big cross section multiple seam tunnel piercing outburst prevention measures effect tube sample boring arrangement, tube sample boring is located at by multiple
Pass through in the extraction control area (2) of pre-extraction borehole (1) far-end formation at least two coal seam, it is characterised in that described
Tube sample boring includes multiple first tube sample boring (3) and multiple second tube sample boring (4), and the first tube sample boring (3) is in tunnel
Tunnel to minimum perpendicular distance 10m of first coal seam several to each drilling in coal to be taken off respectively, several first tube sample borings (3)
In the far-end of at least two be positioned at the 2m at described extraction control area (2) edge in the range of, the first tube sample boring (3) is used
Overall verifying outburst prevention effect at least two coal seam；Second tube sample boring (4) tunnel piercing to treat exposed coal layer minimum vertical away from
To drilling in coal to be taken off away from 3m, the second tube sample boring (4) verifying outburst prevention effect before treating exposed coal layer exposed coal.
Big cross section multiple seam tunnel piercing outburst prevention measures effect tube sample boring arrangement the most according to claim 1, its
Being characterised by, the aperture of described first tube sample boring (3) is 89mm；First tube sample boring (3) number in described each coal seam
Amount is 9, and upper, middle and lower three row that 9 the first tube sample borings (3) press tunnel cross-section is uniform, and 3 often arranged by left, center, right each 1
Individual distribution, wherein, the far-end of 1 the first tube sample boring (3) laying respectively at about lower row two jiaos is positioned at described extraction control zone
In the range of the 2m at territory (2) edge.
Big cross section multiple seam tunnel piercing outburst prevention measures effect tube sample boring arrangement the most according to claim 1, its
Being characterised by, the aperture of described second tube sample boring (4) is 65mm, and the second tube sample boring (4) is located at two be completed
In the middle of adjacent pre-extraction borehole (1), the sampling region that multiple second tube sample boring (4) far-ends are formed is away from tunnel excavation control wheel
Not less than 5m, lower section not less than 3m, left and right all not less than 5m above profile, multiple second tube sample borings (4) are in matrix cloth
Put.
4. imitate according to the big cross section multiple seam tunnel piercing outburst prevention measures described in any one claim in claims 1 to 3
Really tube sample boring arrangement, it is characterised in that be additionally included in tunnel piercing to treating at exposed coal layer minimum perpendicular distance 5m to treating
Taking off the 3rd tube sample boring (5) that the multiple aperture of drilling in coal is 75mm, the 3rd tube sample boring (5) is located at two phases being completed
In the middle of adjacent pre-extraction borehole (1), the sampling region that multiple 3rd tube sample boring (5) far-ends are formed controls profile away from tunnel excavation
It is not less than 5m, left and right all not less than 9m not less than 10m, lower section above line；Multiple 3rd tube sample borings (5) are in matrix arrangements.
5. imitate according to the big cross section multiple seam tunnel piercing outburst prevention measures described in any one claim in claims 1 to 3
Really tube sample boring arrangement, it is characterised in that be additionally included at the ort after being opened by exposed coal layer and be provided for ort prediction
4th tube sample boring (7), the aperture of the 4th tube sample boring (7) is 42mm, and the 4th tube sample boring (7) is set to coal seam, place
(6) concordant hole, the sampling region that the 4th tube sample boring (7) far-end is formed is above tunnel excavation control wheel profile, lower section
With left and right all not less than 3m；Multiple 4th tube sample borings (7) are radially arranged.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111520127A (en) * | 2020-04-30 | 2020-08-11 | 武汉大学 | In-situ testing device for engineering rock mechanical parameter advanced drilling and application method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111520127A (en) * | 2020-04-30 | 2020-08-11 | 武汉大学 | In-situ testing device for engineering rock mechanical parameter advanced drilling and application method thereof |
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