CN103954501B - Coal body flexibility reinforces test specimen determination method for parameter and application - Google Patents
Coal body flexibility reinforces test specimen determination method for parameter and application Download PDFInfo
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- CN103954501B CN103954501B CN201410165503.4A CN201410165503A CN103954501B CN 103954501 B CN103954501 B CN 103954501B CN 201410165503 A CN201410165503 A CN 201410165503A CN 103954501 B CN103954501 B CN 103954501B
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Abstract
The invention discloses the defining method of the flexible Reinforcing parameter of a kind of coal body, comprise: 1) coal dust is mixed according to different proportion with slurries, insert and place in the mould of coir rope, record the slurries ratio of each test specimen, each position of test specimen coir rope and the diameter of coir rope; 2) mould is placed in compaction apparatus carries out compacting; Coal sample test specimen compaction apparatus adopts proof stress mode to load, and ensures that the compaction of each coal sample test specimen is identical; 3) remove mould after 10 ~ 15min, take out test specimen and number, obtain the coal sample test specimen that there is coir rope inside, place 1-2 days; 4) adopt rock mechanics experiment machine to carry out uniaxial compressive, angle mould compression-shear test to each test specimen, obtain the relation of each Reinforcing parameter and coal sample test piece intensity; The variation characteristic in temperature field in infrared imaging device monitoring test piece deformation process is applied, in order to predict test specimen rupture location in loading procedure; 5) step 1 is repeated)-step 4), determine optimum Reinforcing parameter.
Description
Technical field
The present invention relates to the flexible reinforcement form of one " coir rope+slip casting " coal sample and parameter determination test method, for the prophylactico-therapeutic measures of coal mine large-mining high comprehensive mining workplace and fully mechanized coal face coal wall caving determine, process parameter optimizing provides test basis.
Background technology
In recent years, along with improving constantly of coal-face support equipment manufacture level, mining height workface and top coal caving mining become the important development direction of China's thick coal-layer mining gradually, coal recovery rate, workplace production capacity are all greatly improved, but the raising of mining rate has also caused some new problems, coal wall caving, the more common fully-mechanized mining working of face roof-fall contingency occurrence probability are high by 10%, become the key factor of restriction high working face and the performance of fully mechanized coal face production capacity.At present, rib grouting reinforcement technique controls coal wall caving comparatively proven technique, the slurry consolidation body be present in the crisscross crack of broken coal improves the resistance to overturning of rib, but reasonable quantity of grouting and slip casting effect be determined to become insoluble problem in engineer applied.
Summary of the invention
Given this, the present invention proposes the experimental technique that a kind of coal body " coir rope+slip casting " flexible reinforcement form and consolidation effect are determined, this experimental technique can obtain the variation characteristic in temperature field in different coir rope diameter, the resistance to compression containing slurry amount coal sample test specimen of coir rope position, shearing strength, test piece deformation process by experiment in laboratory.Thus the relation of reflection coal mass strength and coir rope diameter, slip casting position and grouting amount, determine to make coal mass strength to reach the optimum coir rope diameter of engineer applied, coir rope position and grouting amount;
The concrete technical scheme of the flexible Reinforcing parameter defining method of a kind of coal body that the present invention proposes comprises " coir rope+slip casting " and reinforces the shaping and flexible reinforcing coal sample test piece intensity determination test of coal sample test specimen making:
Specifically comprise the following steps:
1) coal dust is mixed according to different proportion with slurries, insert and place in the mould of coir rope, record the slurries ratio of each test specimen, each position of test specimen coir rope and the diameter of coir rope; The bulk coal sample pulverizing that coal dust takes from coal-face forms, and the particle diameter of pulverizing is less than 5mm; Slurries are mixed by A, B two kinds of chemical reagent of Ma Lisan, and reagent A, B place separately can not consolidation, consolidation rapidly after mixing;
2) mould is placed in compaction apparatus carries out compacting; Coal sample test specimen compaction apparatus adopts proof stress mode to load, and ensures that the compaction of each coal sample test specimen is identical;
3) remove mould after 10 ~ 15min, take out test specimen and number, obtain the coal sample test specimen that there is coir rope inside, room temperature environment places 1-2 days;
4) adopt rock mechanics experiment machine to carry out uniaxial compressive, angle mould compression-shear test to each test specimen, obtain the relation of each Reinforcing parameter with coal sample test piece intensity; Simultaneously by the change of temperature field feature in infrared imaging device monitoring test specimen loading procedure, predict coal sample test specimen failure position under different Reinforcing parameter; Thus determine to make coal sample test piece intensity reach the Reinforcing parameter of maximal value, Reinforcing parameter comprises the blending ratio of coal dust and slurries and the position of coir rope and diameter.
Coal sample test piece mould can adopt length to be the cube of 70mm, wherein relative two help detachable, conveniently take out shaping coal sample test specimen, aperture vertical direction being made a call to 5 diameter 4mm is helped detachable two, the 1st, its middle and lower part hole heart is apart from bottom 11mm, 1st, 2 hole distance of center circle are 13mm, and all the other hole hearts are apart from being 12mm, and circular hole is used for wearing puts coir rope.
Manual compaction apparatus comprises manual liquid collecting device, hydraulic jack, hydralic pressure gauge and mould and places dull and stereotyped, adopts proof stress load mode to carry out compacting, identical to ensure the compaction of each coal sample test specimen.
Present invention also offers the embody rule scheme of the Reinforcing parameter of coal sample test specimen, according to the Reinforcing parameter determined, the technological parameter of on-the-spot rib slip casting is determined.
The beneficial effect that the present invention produces is:
The processing of coal sample test specimen and experimentation carry out in the lab, single coal sample test specimen institute coal consumption, slurries amount are all less, the cost carrying out many group experiments is low, just can obtain the relation of coir rope diameter, coir rope position and slurries amount and coal sample test piece intensity in the lab, for the determination of on-the-spot grouting technology parameter lays the foundation, and a large amount of manpower and materials need not be spent to do a large amount of type approval tests at the scene to find best grouting technology parameter.
Accompanying drawing explanation
When considered in conjunction with the accompanying drawings, more completely the present invention can be understood better.Accompanying drawing described herein is used to provide a further understanding of the present invention, and embodiment and explanation thereof, for explaining the present invention, do not form inappropriate limitation of the present invention.
Fig. 1 is broken coal sample and slip casting shaping test piece manufacturing process figure again in the present invention;
Fig. 2 is coal sample test specimen illustraton of model;
Fig. 3 is that in the present invention, coal sample test specimen makes mould;
Fig. 4 Non-follow control stress type compaction apparatus;
Fig. 5 is flexible reinforcing coal sample test specimen uniaxial compressive test figure;
Fig. 6 is flexible reinforcing coal sample test specimen angle mould compression-shear test figure.
Embodiment
For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, and below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
The present invention mainly comprises following three processes: 1) installation of detachable cube mold and coir rope place; 2) making of flexible reinforcing coal sample test specimen is shaping; 3) determination of the coal sample test piece intensity of different Reinforcing parameter.
Flexibility is as shown in Figure 1 reinforced coal sample test specimen manufacturing process and is comprised: the bulk coal sample that coal-face is fetched by (1) is ground into the coal dust that particle diameter is less than 5mm; (2) coal dust, slurries are pressed different proportion mixing, stir; The potpourri of different proportion is respectively charged into and has placed in advance in the mould as shown in Figure 2 of coir rope; (3) mould filling potpourri is placed on the compaction apparatus flat board shown in Fig. 3, carries out manual compacting by the pressure controlling oil pressure gauge, to ensure coal sample test piece intensity not by the impact of compaction; (4) coal sample after compacting is placed 10-15min, remove detachable cube mold two help, and are taken out by coal sample test specimen, form the flexibility shown in Fig. 1 and reinforce coal sample test specimen.
As Fig. 2, the flexible Reinforcing parameter determination process of the test shown in 3 comprises: (1) adopts rock mechanics experiment machine to carry out resistance to compression, shear test to coal sample test specimen, adopts command displacement mode to load; (2) resistance to compression of the coal sample test specimen of different coal dust, slurries ratio, coir rope diameter, coir rope position, shearing strength are analyzed, determine that coal sample test piece intensity reaches the Reinforcing parameter of maximal value.
The flexible Reinforcing parameter defining method of coal body in the present invention can facilitate, make the different coal slurry ratio of many groups quickly, the coal sample test specimen of coir rope diameter and coir rope position, Non-follow control stress type compaction apparatus can ensure that the compaction of coal sample test specimen is identical, decompaction degree is on the impact of coal sample test piece intensity, reinforce coal sample test specimen to the flexibility made carry out uniaxial compressive and angle mould compression-shear test and utilize data handling system to process experimental data, draw coal sample test piece intensity and slurries quality, the relation of coir rope position and coir rope diameter, thus be grouting amount in high working face and top-coal caving face rib " coir rope+slip casting " support process, the selection of coir rope diameter and grouting hole position provides test basis, and just need not can determine grouting technology parameter through a large amount of on-the-spot rib type approval test, greatly save cost.
Embodiment
These real case simulation slurries account for 10% of coal dust 1 quality, the determination of coir rope 7 diameter 3mm, coir rope 7 flexible making of reinforcing coal sample test specimen under 36mm condition bottom test specimen shaping and uniaxial compressive and shearing strength, and concrete steps are:
(1), in Fig. 1, balance 6 is utilized to take coal dust 1,100g reagent A 2, the mixed slurries of B3 of 1000g; (2) coal dust and slurries are poured in container 4 mix and stir; (3) 8,9 liang of sides coal sample in Fig. 3 being made mould load onto and in distance hole 10, bottom the 3rd, place the coir rope 7 of diameter 3mm; (3) in Fig. 4, coal dust, slurries uniform mix are inserted in mould 5, and mould mould being placed on compaction apparatus is placed on dull and stereotyped 12, controls manual liquid collecting device 11 and utilizes 3MPa pressure to carry out compacting to potpourri, hydralic pressure gauge 13 is for showing pressure, and hydraulic jack 14 is implemented to press down; (4), after 10-15min, remove two of mould and help shaping coal sample test specimen to take out, and place 1-2 days in the lab, make the abundant consolidation of slurries existed in coal sample test specimen.
In Fig. 5, Fig. 6, adopt rock mechanics experiment machine to carry out uniaxial compressive test 15 and angle mould compression-shear test 16 to test specimen, and monitor the change of temperature in test specimen loading procedure with infrared imaging device 17.Adopt command displacement load mode, loading speed 2mm/min; Until test specimen no longer deforms, stop loading, load test terminates.
Utilize data handling system to process the data of data acquisition system (DAS) record in process of the test, obtain respectively slurries account for quality of pc 10%, coir rope diameter 3mm, coir rope under 36mm condition bottom test specimen flexible reinforce coal sample test specimen uniaxial compressive strength, shearing strength and cohesion and angle of internal friction.
The inventive method flow process is simple, cost is low, feasibility is high, effectively can simulate coir rope position, the relation of coir rope diameter and grouting amount and coal sample test piece intensity, for the determination of on-the-spot rib grouting technology parameter is laid a good foundation.
Apply specific embodiment herein to set forth process flow of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications.In sum, this description should not be construed as restriction of the present invention.
Claims (7)
1. coal body flexibility reinforces a test specimen determination method for parameter, it is characterized in that, comprises the following steps:
1) coal dust is mixed according to different proportion with slurries, insert and place in the mould of coir rope, record the slurries ratio of each test specimen, the diameter of the position of each test specimen coir rope, number and coir rope;
2) mould is placed in compaction apparatus carries out compacting;
3) remove mould after 10 ~ 15min, take out test specimen numbering, obtain inside have coir rope containing slurries coal sample test specimen, room temperature environment places 1-2 days;
4) adopting rock mechanics experiment machine to carry out uniaxial compressive, angle mould compression-shear test respectively to often organizing the identical test specimen of parameter, obtaining the relation of each Reinforcing parameter and coal sample test piece intensity; And apply the variation characteristic in temperature field in infrared imagery technique monitoring test specimen load deflection process, in order to predict test specimen rupture location;
5) step 1 is repeated)-step 4), through data handling system, experimental data is processed, draw the relation of test piece intensity and slurries quality and coir rope diameter, position, the uniaxial compressive strength of coal sample test specimen, cohesion and angle of internal friction under different grouting amount, different coir rope diameter, position, and the change of temperature field before and after coal sample surface breakdown, thus determine to make coal sample test piece intensity reach the optimum Reinforcing parameter of engineer applied; Reinforcing parameter comprises the blending ratio of coal dust and slurries and the diameter of coir rope and position.
2. a kind of coal body flexibility according to claim 1 reinforces test specimen determination method for parameter, it is characterized in that, step 1) in the coal dust bulk coal sample of taking from coal-face pulverize and form, the particle diameter of pulverizing is less than 5mm.
3. a kind of coal body flexibility according to claim 1 reinforces test specimen determination method for parameter, it is characterized in that, step 1) in slurries be by etc. the Ma Lisan slurries that mix of the reagent A of quality, B.
4. a kind of coal body flexibility according to claim 1 reinforces test specimen determination method for parameter, it is characterized in that, step 1) in, the coir rope of different-diameter, different number, diverse location can be placed in a mold.
5. a kind of coal body flexibility according to claim 1 reinforces test specimen determination method for parameter, it is characterized in that, step 2) in, compaction apparatus is that manual compaction apparatus comprises manual liquid collecting device, hydraulic jack, hydralic pressure gauge and mould placement flat board, compaction apparatus adopts proof stress mode to load, and ensures that the compaction of each coal sample test specimen is identical.
6. a kind of coal body flexibility according to claim 1 reinforces test specimen determination method for parameter, it is characterized in that, step 4) in the variation characteristic with temperature field in infrared imaging device monitoring test piece deformation process.
7., as a kind of coal body flexibility in claim 1 reinforces an application for test specimen parameter, it is characterized in that, according to the Reinforcing parameter obtained, the technological parameter of on-the-spot rib slip casting is determined.
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| CN107976369B (en) * | 2017-11-17 | 2020-05-12 | 西南石油大学 | Simulation system and experimental method for synchronous grouting by shield method |
| CN114479973B (en) * | 2022-01-14 | 2023-06-30 | 安徽理工大学 | Method for improving strength of loose thick coal seam by using novel inorganic nano environment-friendly material |
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| CN101439950A (en) * | 2008-12-19 | 2009-05-27 | 中国科学院武汉岩土力学研究所 | Flexible coal powder foam concrete and preparation thereof |
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