CN103954501A - Determination method for parameters of flexible reinforcing test pieces of coal body and application thereof - Google Patents
Determination method for parameters of flexible reinforcing test pieces of coal body and application thereof Download PDFInfo
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- CN103954501A CN103954501A CN201410165503.4A CN201410165503A CN103954501A CN 103954501 A CN103954501 A CN 103954501A CN 201410165503 A CN201410165503 A CN 201410165503A CN 103954501 A CN103954501 A CN 103954501A
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Abstract
The invention discloses a determination method for parameters of flexible reinforcing test pieces of of a coal body. The method comprises the following steps: (1) uniformly mixing coal powder with slurries in the different proportions; feeding into a mould through which a coir rope penetrates, recording the proportion of the slurries of the test pieces, the position of the coir ropes of the test pieces and the diameters of the coir ropes; (2) putting the mould into a compaction device for compacting; loading the coal sample test piece compaction device by means of stress control to ensure that the compactness degrees of the test pieces of the coal samples are same; (3) detaching the mould after 10-15 minutes, taking out the test pieces and numbering to obtain coal sample test pieces with coir ropes inside and placing for 1-2 days; (4) performing uniaxial compression and angle mould compression shearing test on the test pieces by using a rock mechanics test machine to obtain the relation between the reinforcing parameters and the intensity of the coal sample test pieces; predicting the cracking positions of the test pieces by utilizing the change characteristic of a temperature field in the process of monitoring the deformation of the test pieces by using infrared imaging equipment during loading; and (5) repeatedly carrying out the steps (1)-(4) and determining the optimal reinforcing parameters.
Description
Technical field
The present invention relates to the flexible reinforcement form of a kind of " coir rope+slip casting " coal sample and parameter and determine test method, for the prophylactico-therapeutic measures of coal mine large-mining high comprehensive mining workplace and fully mechanized coal face coal wall caving is determined, process parameter optimizing provides test basis.
Background technology
In recent years, along with improving constantly of coal-face support equipment manufacture level, large mining and high comprehensive mining and comprehensive discharge technique 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 end face roof fall accident probability of happening are high by 10%, become the key factor of the large mining height of restriction and the performance of fully mechanized coal face production capacity.At present, rib grouting reinforcement technique is to control coal wall caving compared with proven technique, be present in the resistance to overturning that slurry consolidation body in the crisscross crack of broken coal has improved rib, but reasonable quantity of grouting and slip casting effect definite becomes insoluble problem in engineering application.
Summary of the invention
Given this, the present invention proposes the flexible reinforcement form of a kind of coal body " coir rope+slip casting " and the definite experimental technique of consolidation effect, this experimental technique can obtain by experiment the variation characteristic containing temperature field in the resistance to compression of slurry amount coal sample test specimen, shearing strength, test piece deformation process of different coir rope diameters, coir rope position in laboratory.Thereby the relation of reflection coal mass strength and coir rope diameter, slip casting position and grouting amount, determines the optimum coir rope diameter, coir rope position and the grouting amount that make coal mass strength reach engineering application;
The flexible concrete technical scheme of reinforcing parameter determination method of a kind of coal body that the present invention proposes comprises that " coir rope+slip casting " reinforcing coal sample test specimen is made moulding and the flexible coal sample test specimen strength detection of reinforcing is tested:
Specifically comprise the following steps:
1) coal dust is mixed according to different proportion with slurries, insert in the mould that places coir rope, record the slurries ratio of each test specimen, the position of each test specimen coir rope and the diameter of coir rope; The bulk coal sample pulverizing that coal dust is taken from coal-face forms, and the particle diameter of pulverizing is less than 5mm; Slurries are mixed by the beautiful loose A of horse, two kinds of chemical reagent of B, and reagent A, the independent placement of B can be not fixed, fixed rapidly after mixing;
2) mould is placed on and in compaction apparatus, carries out compacting; Coal sample test specimen compaction apparatus adopts proof stress mode to load, and guarantees that the compaction of each coal sample test specimen is identical;
3) after 10～15min, remove mould, take out test specimen numbering, obtain the coal sample test specimen that there is coir rope inside, room temperature environment is placed 1-2 days;
4) adopt rock mechanics experiment machine to carry out single shaft resistance to compression, angle mould pressure scissor test to each test specimen, obtain each and reinforce parameter with the relation of coal sample test specimen intensity; Simultaneously with the change of temperature field feature in infrared imaging device monitoring test specimen loading procedure, coal sample test specimen failure position under the different reinforcing of prediction parameter; Thereby determine and make coal sample test specimen intensity reach peaked reinforcing parameter, reinforce parameter and comprise 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 moulding coal sample test specimen, at detachable two apertures of helping to make a call in vertical direction 5 diameter 4mm, the 1st of 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 holes hearts are apart from being 12mm, and circular hole is used for wearing puts coir rope.
Manually compaction apparatus comprises that manual liquid collecting device, hydraulic jack, hydralic pressure gauge and mould placement are dull and stereotyped, adopts proof stress load mode to carry out compacting, identical to guarantee the compaction of each coal sample test specimen.
The present invention also provides the concrete application scheme of the reinforcing parameter of coal sample test specimen, according to definite reinforcing parameter, 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 laboratory, single coal sample test specimen institute coal consumption, slurries amount are all less, the cost that carries out many group experiments is low, in laboratory, just can obtain the relation of coir rope diameter, coir rope position and slurries amount and coal sample test specimen intensity, for the definite of on-the-spot grouting process parameter lays the foundation, and need not spend a large amount of manpower and materials, do at the scene a large amount of type approval tests and find best grouting process parameter.
Accompanying drawing explanation
When considered in conjunction with the accompanying drawings, can more completely understand better the present invention.Accompanying drawing described herein is used to provide a further understanding of the present invention, and embodiment and explanation thereof are used for explaining the present invention, does 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 is made mould;
The manual proof stress type of Fig. 4 compaction apparatus;
Fig. 5 is the flexible coal sample test specimen single shaft compression test figure that reinforces;
Fig. 6 is that the flexible coal sample test specimen angle mould of reinforcing is pressed scissor test figure.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, 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 and the coir rope of detachable cube mold place; 2) flexible making moulding of reinforcing coal sample test specimen; 3) the coal sample test specimen intensity of different reinforcing parameters determines.
Flexibility is as shown in Figure 1 reinforced coal sample test specimen manufacturing process and is comprised: the bulk coal sample that (1) fetches coal-face is ground into the coal dust that particle diameter is less than 5mm; (2) coal dust, slurries are pressed to different proportion and mixed, stir; The potpourri of different proportion is respectively charged in the mould as shown in Figure 2 that has placed in advance coir rope; (3) mould of filling potpourri is placed on the compaction apparatus flat board shown in Fig. 3, by controlling the pressure of oil pressure gauge, carries out manual compacting, to guarantee the impact of coal sample test specimen intensity Bu Shou compaction; (4) coal sample after compacting is placed to 10-15min, remove two of detachable cube mold and help, coal sample test specimen is taken out, form the flexibility shown in Fig. 1 and reinforce coal sample test specimen.
As Fig. 2, the flexibility shown in 3 is reinforced parameter and is determined that process of the test comprises: (1) adopts rock mechanics experiment machine to carry out resistance to compression, shear test to coal sample test specimen, adopts control displacement mode to load; (2) resistance to compression, the shearing strength of the coal sample test specimen of different coal dusts, slurries ratio, coir rope diameter, coir rope position are analyzed, determined coal sample test specimen intensity and reach peaked reinforcing parameter.
The flexible parameter determination method of reinforcing of coal body in the present invention can facilitate, make quickly the different coal slurry ratios of many groups, the coal sample test specimen of coir rope diameter and coir rope position, manually proof stress type compaction apparatus can guarantee that the compaction of coal sample test specimen is identical, the impact of decompaction degree on coal sample test specimen intensity, the flexibility of making is reinforced to coal sample test specimen carries out single shaft resistance to compression and angle mould pressure scissor test and utilizes data handling system to process experimental data, draw coal sample test specimen intensity and slurries quality, the relation of coir rope position and coir rope diameter, thereby be grouting amount in large mining height 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 need not just can determine grouting process parameter through a large amount of on-the-spot rib type approval tests, greatly saved cost.
Embodiment
These real case simulation slurries account for coal dust 1 quality 10%, coir rope 7 diameter 3mm, coir rope 7 are definite apart from flexible making moulding of reinforcing coal sample test specimen and single shaft resistance to compression and shearing strength under the 36mm condition of test specimen bottom, concrete steps are:
(1), in Fig. 1, utilize balance 6 to take coal dust 1,100g reagent A 2, the mixed slurries of B3 of 1000g; (2) coal dust and slurries are poured into and in container 4, mixed and stir; (3) 8,9 liang of sides that coal sample in Fig. 3 made to mould load onto and in the 3rd hole 10, bottom, are placing the coir rope 7 of diameter 3mm; (3) in Fig. 4, coal dust, slurries uniform mix are inserted in mould 5, and the mould that mould is placed on to 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 the coal sample test specimen of moulding to take out, and in laboratory, place 1-2 days, make the slurries that exist in coal sample test specimen fully fixed.
In Fig. 5, Fig. 6, adopt rock mechanics experiment machine to carry out single shaft compression test 15 and angle mould pressure scissor test 16 to test specimen, and with infrared imaging device 17, monitor the variation of temperature in test specimen loading procedures.Adopt and control displacement load mode, loading speed 2mm/min; Until test specimen no longer deforms, stop loading, load test finishes.
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 be apart from flexible uniaxial compressive strength, shearing strength and cohesion and angle of internal friction of reinforcing coal sample test specimen under the 36mm condition of test specimen bottom.
The inventive method flow process is simple, cost is low, feasibility is high, can effectively simulate the relation of coir rope position, coir rope diameter and grouting amount and coal sample test specimen intensity, is definite the laying a good foundation of on-the-spot rib grouting process parameter.
Applied specific embodiment herein process flow of the present invention and embodiment are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof; 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. the flexible test specimen determination method for parameter of reinforcing of coal body, is characterized in that, comprises the following steps:
1) coal dust is mixed according to different proportion with slurries, insert in the mould that places 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 on and in compaction apparatus, carries out compacting;
3) after 10～15min, remove mould, take out test specimen numbering, obtain inside have coir rope containing slurries coal sample test specimen, room temperature environment is placed 1-2 days;
4) adopt rock mechanics experiment machine to carry out single shaft resistance to compression, angle mould pressure scissor test to each test specimen, obtain the relation that each reinforces parameter and coal sample test specimen 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) repeating step 1)-step 4), through data handling system, experimental data is processed, draw the relation of test specimen intensity and slurries quality and coir rope diameter, position, uniaxial compressive strength, cohesion and the angle of internal friction of coal sample test specimen under different grouting amounts, different coir rope diameter, position, and the change of temperature field before and after coal sample surface breakdown, thereby determine the optimum reinforcing parameter that makes coal sample test specimen intensity reach engineering application; Reinforce parameter and comprise the blending ratio of coal dust and slurries and the diameter of coir rope and position.
2. the flexible test specimen determination method for parameter of reinforcing of a kind of coal body according to claim 1, 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. the flexible test specimen determination method for parameter of reinforcing of a kind of coal body according to claim 1, is characterized in that step 1) in the slurries reagent A of quality, the beautiful loose slurries of horse that B mixes such as serve as reasons.
4. the flexible test specimen determination method for parameter of reinforcing of a kind of coal body according to claim 1, is characterized in that step 1) in, the coir rope of different-diameter, different number, diverse location in mould, can be placed.
5. a kind of coal body flexibility according to claim 1 is reinforced test specimen determination method for parameter, it is characterized in that, step 2) in, compaction apparatus is that manual compaction apparatus comprises that manual liquid collecting device, hydraulic jack, hydralic pressure gauge and mould placement are dull and stereotyped, compaction apparatus adopts proof stress mode to load, and guarantees that the compaction of each coal sample test specimen is identical.
6. the flexible test specimen determination method for parameter of reinforcing of a kind of coal body according to claim 1, is characterized in that step 4) in the variation characteristic with temperature field in infrared imaging device monitoring test piece deformation process.
7. an application of reinforcing the reinforcing parameter of test specimen as flexible in the coal body in claim 1, is characterized in that, according to the reinforcing parameter obtaining, the technological parameter of on-the-spot rib slip casting is determined.
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| CN201410165503.4A CN103954501B (en) | 2014-04-23 | 2014-04-23 | Coal body flexibility reinforces test specimen determination method for parameter and application |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107976369A (en) * | 2017-11-17 | 2018-05-01 | 西南石油大学 | A kind of simulation system and experimental method for shield method synchronous grouting |
| CN114479973A (en) * | 2022-01-14 | 2022-05-13 | 安徽理工大学 | Method for improving strength of loose thick coal seam by using novel inorganic nano environment-friendly material |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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- 2014-04-23 CN CN201410165503.4A patent/CN103954501B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107976369A (en) * | 2017-11-17 | 2018-05-01 | 西南石油大学 | A kind of simulation system and experimental method for shield method synchronous grouting |
| 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 |
| CN114479973A (en) * | 2022-01-14 | 2022-05-13 | 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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| CN103954501B (en) | 2016-02-17 |
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