CN108398333A - The prediction technique of adjacent air space coal roadway rock sound load is adopted under a kind of tight roof - Google Patents
The prediction technique of adjacent air space coal roadway rock sound load is adopted under a kind of tight roof Download PDFInfo
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- CN108398333A CN108398333A CN201810325960.3A CN201810325960A CN108398333A CN 108398333 A CN108398333 A CN 108398333A CN 201810325960 A CN201810325960 A CN 201810325960A CN 108398333 A CN108398333 A CN 108398333A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0044—Pneumatic means
Abstract
The invention belongs to underground coal road research field, especially a kind of prediction technique suitable for adopting adjacent air space coal roadway rock sound load under tight roof comprising four steps：First step scene geological mechanics test in situ, obtains physical attribute, the mechanical attribute of coal and roof strata；Second step is based on coal and rock similar material mixture test result, establishes the large scale plane stress physically scaled model containing heading；Third walks, and configures the monitoring system of feature physical index during working face mining in physical model；Roof Breaking structure feature, static load feature, dynamic load feature are adopted in 4th step, the statistical analysis of monitoring data, prediction.The method of the present invention economic cost is low, labor intensity is small, it is repeatable it is strong, can directly observe；Installation cost, the labour cost needed for in-situ monitoring are reduced, predetermined period is shortened；It realizes that working face excavates in one physical model to monitor more physical indexs of tunnel repair, there is wide applicability in the art.
Description
Technical field
The invention belongs to underground coal road research fields, especially a kind of to be suitable for adopting adjacent air space coal roadway rock under tight roof
The prediction technique that sound carries.
Background technology
Adjacent air space coal road is proximate to the working face extraction tunnel of goaf side, according to pick lane opportunity and spatial position, can incite somebody to action
It is to ensure that modern mine is efficient that it, which is divided into gob side entry driving, meets digging lane, gob side entry retaining, stays coal pillar entry retaining, security maintenance,
The key intelligently exploited.Adopting the movement of short distance thick-layer tight roof forces adjacent air space coal road to be subjected to lateral-supporting stress, advanced branch
The superposition that power, the dynamic-load stress of promising disturb, when bearing capacity is insufficiently resistant to the effect, adjacent air space coal roadway rock will generate
The coal rock dynamic disasters such as large deformation even impulsion pressure, seriously affect the security maintenance in such tunnel.How to obtain adopt it is hard
The static load and dynamic load feature that adjacent air space coal roadway rock carries during roof movement need to solve as domain engineering technical staff
Problem.
Invention content
Present invention aims to overcome that the shortcoming of prior art, provide that a kind of economic cost is low, labor intensity is small, prison
Survey the period it is short adopt adjacent air space coal roadway rock sound load prediction technique.
The present invention is technical solution used by solving its technical problem：
The prediction technique of adjacent air space coal roadway rock sound load, including following four steps are adopted under a kind of tight roof：The first step, it is existing
Field geological mechanics test in situ, obtains physical attribute, the mechanical attribute of coal and roof strata；Second step, it is similar based on coal and rock
Material mixture ratio test result establishes the large scale plane stress physically scaled model containing heading；Third walks, and configures physics mould
In type during working face mining feature physical index monitoring system；4th step, the statistical analysis of monitoring data, prediction are adopted
Roof Breaking structure feature, static load feature, dynamic load feature.
Further, the first step carries out scene geological mechanics test in situ, obtains coal specifically, before working face mining
And physical attribute, the mechanical attribute of roof strata, working seam coal and rock geomechanics report nearby is formed, research work face is adopted
Programme is dug, the engineering report of working face mining is formed.
Further, the second step builds suitable simulation experiment platform specifically, according to field engineering geological conditions,
Geometric dimension based on experiment porch and live prototype, determines the geometric similarity ratio of similarity simulation experiment, is based on existing coal petrography
Body similar material mixture test result determines rational analog material and its dosage, establishes the large scale plane containing heading
Stress physically scaled model.
Further, third step is several in seat earth arrangement spaced apart specifically, in model process of deployment
Strain gauge helps one strain gauge of each arrangement in back, two；Positional symmetry arrangement 4 close to four angles of model
Totally 8 large scale acoustic emission probes refer in tight roof, soft stratum surface layout monitoring point for displacement to form physics group
Mark monitoring system.
Further, the 4th step to model specifically, apply boundary condition, simulation initial rock stress field, step excavation work
Make face, records in digging process and adopt Roof Breaking structure feature, static load feature, dynamic load feature.
Further, adjacent air space coal road and working face excavation are arranged in the same scale model, and simulation working face is adopted pair
The sound of adjacent air space coal road, which carries, to be influenced.
Further, physical index monitoring system realize monitored in a model tight roof fracture structure feature,
Static load feature, dynamic load feature.
Possessed advantageous effect is the present invention compared with prior art：（1）Economic cost is low, labor intensity is small, can weigh
Renaturation is strong, can directly observe；（2）Installation cost, the labour cost needed for in-situ monitoring are reduced, predetermined period is shortened；（3）One physics
It realizes that working face excavates in model to monitor more physical indexs of tunnel repair；（4）By adopting the above-described technical solution, this hair
Bright that physical index monitoring sensor is installed in model process of deployment by establishing large scale physically scaled model, simulation is live
Tight roof motion structure feature, static load feature and dynamic load feature in working face mining active process have wide in the art
General practicability.
Description of the drawings
Fig. 1 is the example physical structural schematic diagram of the present invention；In figure：1- simulation experiment platforms, 2- seat earths rock stratum, 3-
Working seam, 4- working faces, 5- adjacent air space coal roads, 6- tight roofs, 7- soft stratums, 8- strain gauges, 9- acoustic emission probes,
10- monitoring point for displacement.
Fig. 2 is the typical working seam localized borehole block diagram of the present invention.
Fig. 3 is scale model mix proportion scheme of the present invention and analog material dosage.
Fig. 4 is that the present invention adopts Roof Breaking structure feature.
Fig. 5 is that the present invention adopts country rock static load changing rule caused by roof movement.
Fig. 6 is that the present invention adopts country rock dynamic load changing rule caused by roof movement.
Specific implementation mode
The present invention is described in further detail with reference to embodiment, embodiments of the present invention are not limited thereto.
The prediction technique that adjacent air space coal roadway rock sound load is adopted under a kind of tight roof, is as follows：
The first step before working face mining, adopts that scene geological mechanics test in situ is carried out in the coal seams 15# or investigation is arranged with certain mine master
Engineering geological data, obtains physical attribute, the mechanical attribute of coal and roof strata, and specially coal seam residing for working face is averaged buried depth
For 600m, average thickness 6.5m, mean obliquity is 4 °；Working face the south is real coal body, and north is real coal body, and west is dispersed with
A plurality of main entry is in the east the boundary in exploiting field, above and below be not present goaf；Working face assistant conveyance lane is tunneled along old top,
For rectangular cross section（Size is 5m × 4m）, next working face is served by staying coal pillar entry retaining to remain, coal pillar width is
20m；Working face tilts long 220m, and it is 2200m to move towards advance distance；There are the hard tops of two layers of thick-layer above working seam
Plate, limestone and packsand, respectively away from coal seam 0m and 46.5m, average thickness is respectively 13.5m and 18m, coal seam and roof and floor rock
Layer localized borehole column such as Fig. 2；Coal and rock geomechanics report near working seam is formed according to above-mentioned engineering geological condition, is adjusted
Working face digging programme is ground, the engineering report of working face mining is formed.
Second step builds suitable simulation experiment platform, establishes analog simulation platform 1 according to field engineering geological conditions
Size is 2.5m × 0.3m × 1.9m（Length × width × height）, prototype length is 200m, is highly 152m, determines that geometric similarity ratio is
80；The volume-weighted average on live stratum is 23000kN/m3, analog material selects sand for aggregate, unit weight 15000kN/m3, can count
It is 1.53 to calculate the unit weight likelihood ratio, and it is 122.4 that can calculate stress and the intensity likelihood ratio；Select river sand for aggregate, calcium carbonate and
Gypsum is cementitious matter, and water is cementing agent, and mica powder is interlayer interface, according to each coal rock layer uniaxial compressive strength in scene and intensity
The likelihood ratio selects rational material mixture ratio, determines the material utilization amount of each layer, as shown in figure 3, sand 1733.91kg needed for accumulative,
Calcium carbonate 169.10kg, gypsum 234.49kg, mica 25kg；Finally establish the large scale plane stress physics phase containing heading
Like model, as shown in Figure 1, the material stirred evenly is laid on the 1st layer to the 8th layer successively, wherein first layer is simulated experiment
Platform 1, the second layer be seat earth rock stratum 2, third layer be working seam 3, be provided with working face 4 and adjacent air space coal road 5 and
Positioned in the same scale model, the 4th layer is tight roof 6, and layer 5 is soft stratum 7, layer 6 tight roof 6,
Layer 7 soft stratum 7, the 8th layer of tight roof 6；It is isolated between layers with mica powder, and is consolidated, soft stratum is taken point
Layer is laid with, per 2cm as a sublayering, with the isolation of a small amount of mica powder between sublayering.
Third walks, in model process of deployment, in seat earth several strain gauges of arrangement spaced apart, in tunnel
Top plate, two help one strain gauge of each arrangement, and the positional symmetry close to four angles of model arranges 4 groups of totally 8 large scale sound hairs
Probe is penetrated, in tight roof, soft stratum surface layout monitoring point for displacement, to form physics index monitoring system；Such as Fig. 1 institutes
Show, arranges the miniature AEwin acoustic emission probes 9,144 of soil pressure cell 8,8 monitoring point for displacement of 6 BW type foil altogether in a model
10。
4th step, the even distributed force for loading 55.99kPa in model upper surface with pressurized cylinder are equivalent instead of overlying strata load, mould
Horizontal displacement is fixed on type right boundary, and bottom boundaries vertical displacement is fixed, and front and back boundary belongs to free boundary, is improved using slow
The mode of JI-BA type controllable compression internal system pressures simulates the effect that neighbouring working face adopts advance support stress；By working
Surface side is alternately excavated to middle part to both sides, and speed control excavated 5cm at every 20 minutes, is waited for that working face excavation finishes, is slowly improved
The pressure of pressurized cylinder, until lateral hard cap unstability；It often excavates once, it is laterally hard by photographing to record a goaf
Roof Breaking structure feature is disclosed lateral by the change in location of TS3866 Digital Photogrammetric System monitoring record Shifted Reference points
Tight roof structure motion feature；Pass through American Physical acoustics company（PAC）The AEwin acoustic emission monitoring systems record top of production
The energy fluctuation feature that plate activation generates, discloses tight roof constitutive activation dynamic load feature；The result finally monitored such as Fig. 4 extremely schemes
6。
The above is only presently preferred embodiments of the present invention, not does limitation in any form to the present invention, any ripe
Professional and technical personnel is known, without departing from the scope of the present invention, when the technology contents work using the disclosure above
Go out change or modify the equivalent embodiment of equivalent variations, as long as being the content without departing from technical solution of the present invention, still falls within this
In the range of inventive technique scheme.
Claims (7)
1. adopting the prediction technique of adjacent air space coal roadway rock sound load under a kind of tight roof, which is characterized in that including following four
Step：The first step, scene original position geological mechanics test, obtains physical attribute, the mechanical attribute of coal and roof strata；Second step,
Based on coal and rock similar material mixture test result, the large scale plane stress physically scaled model containing heading is established；The
Three steps configure the monitoring system of feature physical index during working face mining in physical model；4th step, the system of monitoring data
Roof Breaking structure feature, static load feature, dynamic load feature are adopted in meter analysis, prediction.
2. according to the prediction technique for adopting adjacent air space coal roadway rock sound load under a kind of tight roof of claim 1, which is characterized in that
The first step carries out scene geological mechanics test in situ, obtains the physics of coal and roof strata specifically, before working face mining
Attribute, mechanical attribute, form working seam coal and rock geomechanics report nearby, and digging programme in research work face is formed
The engineering report of working face mining.
3. according to the prediction technique for adopting adjacent air space coal roadway rock sound load under a kind of tight roof of claim 2, which is characterized in that
The second step builds suitable simulation experiment platform specifically, according to field engineering geological conditions, based on experiment porch and now
The geometric dimension of field prototype, determines the geometric similarity ratio of similarity simulation experiment, is tried based on existing coal and rock similar material mixture
It tests as a result, determining rational analog material and its dosage, establish the large scale plane stress physically scaled model containing heading.
4. according to the prediction technique for adopting adjacent air space coal roadway rock sound load under a kind of tight roof of claim 3, which is characterized in that
Third step is specifically, in model process of deployment, in seat earth several strain gauges of arrangement spaced apart, in lane
Road top plate, two help one strain gauge of each arrangement；Positional symmetry close to four angles of model arranges 4 groups of totally 8 large scale sound
Transmitting probe, in tight roof, soft stratum surface layout monitoring point for displacement, to form physics index monitoring system.
5. according to the prediction technique for adopting adjacent air space coal roadway rock sound load under a kind of tight roof of claim 4, which is characterized in that
Specifically, applying boundary condition, simulation initial rock stress field to model, step excavation working face is recorded and was excavated 4th step
Roof Breaking structure feature, static load feature, dynamic load feature are adopted in journey.
6. according to the prediction technique for adopting adjacent air space coal roadway rock sound load under a kind of tight roof of claim 1, which is characterized in that
Adjacent air space coal road and working face excavation are arranged in the same scale model, and simulation working face adopts the sound load to adjacent air space coal road
It influences.
7. according to the prediction technique for adopting adjacent air space coal roadway rock sound load under a kind of tight roof of claim 1, which is characterized in that
The physical index monitoring system is realized monitors tight roof fracture structure feature, static load feature, dynamic load spy in a model
Sign.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109269899A (en) * | 2018-09-05 | 2019-01-25 | 中国矿业大学(北京) | A kind of goaf top plate fracture simulation test device |
| CN109489622A (en) * | 2018-11-20 | 2019-03-19 | 中煤航测遥感集团有限公司 | Model production method and settlement prediction device |
| CN109783951A (en) * | 2019-01-22 | 2019-05-21 | 河南理工大学 | A kind of Under Dynamic Load strength grading method disturbing underground space country rock |
| CN109779634A (en) * | 2019-01-24 | 2019-05-21 | 太原理工大学 | Coal mine ground vertical well pressure break tight roof location determining method |
| CN109812276A (en) * | 2019-01-22 | 2019-05-28 | 河南理工大学 | A method of adjacent air space tunnel rational position is determined based on dynamic-load stress field |
| CN109855975A (en) * | 2019-02-27 | 2019-06-07 | 重庆大学 | The regular test method of key strata of covering rock fracture based on analog simulation pilot system |
| CN109958420A (en) * | 2019-03-15 | 2019-07-02 | 河南理工大学 | Simulate the visual test device and test method that stope of coal mines tunnel crack develops |
| CN110836125A (en) * | 2019-11-19 | 2020-02-25 | 大同煤矿集团有限责任公司 | Method for determining progressive breaking advance action range of multi-layer key layer |
| CN111103187A (en) * | 2019-12-04 | 2020-05-05 | 太原理工大学 | Method for predicting breaking impact strength of key layers at different layers |
| CN111396128A (en) * | 2020-02-28 | 2020-07-10 | 北京科技大学 | Mining surrounding rock fracture sliding starting condition and instability process analysis method and system |
| CN111982632A (en) * | 2020-08-27 | 2020-11-24 | 大同煤矿集团有限责任公司 | Method for simulating weakening zone of roof cutting weakening of coal mine |
| CN112213181A (en) * | 2020-09-16 | 2021-01-12 | 安徽理工大学 | Method for monitoring and simulating lateral stress of filling entry retaining roadside body |
| CN113203625A (en) * | 2021-04-15 | 2021-08-03 | 中国科学院地质与地球物理研究所 | Modeling method and device for simulating jointed rock roadway excavation test |
| CN114419982A (en) * | 2021-12-29 | 2022-04-29 | 山东科技大学 | Model test system and method for deformation and damage of roadway in goaf of coal pillar reserved in soft rock stratum |
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Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109269899A (en) * | 2018-09-05 | 2019-01-25 | 中国矿业大学(北京) | A kind of goaf top plate fracture simulation test device |
| CN109489622A (en) * | 2018-11-20 | 2019-03-19 | 中煤航测遥感集团有限公司 | Model production method and settlement prediction device |
| CN109812276B (en) * | 2019-01-22 | 2020-06-02 | 河南理工大学 | Method for determining reasonable position of adjacent empty roadway based on dynamic load stress field |
| CN109783951A (en) * | 2019-01-22 | 2019-05-21 | 河南理工大学 | A kind of Under Dynamic Load strength grading method disturbing underground space country rock |
| CN109812276A (en) * | 2019-01-22 | 2019-05-28 | 河南理工大学 | A method of adjacent air space tunnel rational position is determined based on dynamic-load stress field |
| CN109779634A (en) * | 2019-01-24 | 2019-05-21 | 太原理工大学 | Coal mine ground vertical well pressure break tight roof location determining method |
| CN109855975A (en) * | 2019-02-27 | 2019-06-07 | 重庆大学 | The regular test method of key strata of covering rock fracture based on analog simulation pilot system |
| CN109958420A (en) * | 2019-03-15 | 2019-07-02 | 河南理工大学 | Simulate the visual test device and test method that stope of coal mines tunnel crack develops |
| CN109958420B (en) * | 2019-03-15 | 2021-04-23 | 河南理工大学 | Visual test device and test method for simulating coal mine stoping roadway fracture evolution |
| CN110836125A (en) * | 2019-11-19 | 2020-02-25 | 大同煤矿集团有限责任公司 | Method for determining progressive breaking advance action range of multi-layer key layer |
| CN110836125B (en) * | 2019-11-19 | 2021-07-13 | 晋能控股煤业集团有限公司 | Method for determining progressive breaking advance action range of multi-layer key layer |
| CN111103187A (en) * | 2019-12-04 | 2020-05-05 | 太原理工大学 | Method for predicting breaking impact strength of key layers at different layers |
| CN111103187B (en) * | 2019-12-04 | 2022-04-19 | 太原理工大学 | Method for predicting breaking impact strength of key layers at different layers |
| CN111396128A (en) * | 2020-02-28 | 2020-07-10 | 北京科技大学 | Mining surrounding rock fracture sliding starting condition and instability process analysis method and system |
| CN111982632A (en) * | 2020-08-27 | 2020-11-24 | 大同煤矿集团有限责任公司 | Method for simulating weakening zone of roof cutting weakening of coal mine |
| CN111982632B (en) * | 2020-08-27 | 2023-11-21 | 大同煤矿集团有限责任公司 | Weakening zone simulation method for weakening coal mine roof cutting |
| CN112213181A (en) * | 2020-09-16 | 2021-01-12 | 安徽理工大学 | Method for monitoring and simulating lateral stress of filling entry retaining roadside body |
| CN113203625A (en) * | 2021-04-15 | 2021-08-03 | 中国科学院地质与地球物理研究所 | Modeling method and device for simulating jointed rock roadway excavation test |
| CN113203625B (en) * | 2021-04-15 | 2022-06-17 | 中国科学院地质与地球物理研究所 | Modeling method and device for simulating jointed rock roadway excavation test |
| CN114419982A (en) * | 2021-12-29 | 2022-04-29 | 山东科技大学 | Model test system and method for deformation and damage of roadway in goaf of coal pillar reserved in soft rock stratum |
| CN114419982B (en) * | 2021-12-29 | 2024-03-15 | 山东科技大学 | Model test system and method for deformation and damage of goaf roadway of coal pillar reserved in soft rock stratum |
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