CN102589926A

CN102589926A - Deformed coal sampling method

Info

Publication number: CN102589926A
Application number: CN2012100221058A
Authority: CN
Inventors: 付志亮; 李术才; 王汉鹏; 张庆松; 王素华
Original assignee: 付志亮
Priority date: 2012-01-15
Filing date: 2012-01-15
Publication date: 2012-07-18

Abstract

The invention relates to a deformed coal sampling method, wherein the shape of a coal core is firstly marked on the surface of a coal seam, holes are drilled at interval along the periphery of the marked coal core through a micro electric drill for entering the coal seam, vegetable gum is filled into the holes, the holes are continuously drilled and vegetable gum is filled into the holes until the periphery of the coal core is completely separated from the coal seam, a layer of vegetable gum wraps the side of the coal core, a core clamp ring is assembled to clamp the coal core, the root of the coal core is cut off, and after the coal core is taken out, the two ends of the coal core are coated with the vegetable gum. The coal core sampling method is simple, the core sampling effect is good, and the requirements of completeness, quality guarantee performance and speedability are satisfied. The method is adopted to obtain the coal core which is complete and has maintained original properties, and is particularly suitable to core sampling which measures the physical mechanical properties of soft coal seam seepage.

Description

Structure coal sampling method

Technical field

The present invention relates to a kind of structure coal sampling method, more specifically relate to dead-soft coal petrography physico mechanical characteristic experimental technique field, mainly be applicable to mine mining field.

Background technology

Coal and gas are outstanding to be the major hidden danger of Safety of Coal Mine Production always.The outstanding coal seam of coal and gas all exists to grow has certain thickness structure coal, and characteristics such as outstanding coal layering has low-intensity, low-permeability, the microporosity is many, desorption rate is fast, and it has restricted the exploitation and the exploitation of coal-seam gas.The prerequisite of coal-bed gas extraction, strick precaution gas accident is fully to grasp the coal-bed gas tax to deposit rule, needs parameters such as coal seam gas-bearing capacity, density, hole, distortion, gas absorption and desorb accurately to measure.The structure coal is a kind of outstanding coal, and it comprises granulated coal, rotten rib coal, rubs wrinkle coal, cracked coal, scale coal, broken spot coal, flour coal, callis and thin slice coal.The structure coal petrography also is the extremely low material of intensity, and under the normal pressure effect, the resistance to compression of coal body, tension and shearing strength are 1/tens of other soft rock.

Colliery sampling mode commonly used comprises drill hole sampling (core) and piece stone sampling (on-the-spot sillar) mode, for example a kind of drilling non-destructive sampling method for deep-buried rock (publication number CN101603424), and the mechanical characteristic of the original state rock that test result reflected has been guaranteed in this invention.The preparation method of soft coal petrography test sample and device (publication number CN101294876A); Self sealed self decompressed coal seam sampling method and device (publication number CN101308062A) adopt the aqueous medium coring process that coring bit is had good cooling effect; Solved in getting the core process heat that generates because of coring bit and coal body friction and made the coal core rotten, the coal core has been had the effect of well guaranteeing the quality.But more than get the core mode and all can not guarantee coal body original state characteristic, ubiquity coal core major injury problem, in drilling process, the coal core can soften when meeting water, so, be difficult to obtain complete coal sample; Coal core physico-mechanical properties is changed; Measured mechanical test result can not represent the mechanics parameter under the coal sample original state condition, can only adopt moulded coal to replace former coal sample, promptly be broken into powder to coal dust after; Again compacting forms; The physico-mechanical properties of coal (as: porosity, perviousness, water percentage etc.) is damaged fully, and the mechanics parameters that is obtained can not reflect porosity, gas migration and the distortion of constructing coal petrography truly.Therefore, dead-soft coal seam core-taking rate is low maybe can't get core and the method complicacy never obtains fine solution.

The present invention has realized the integrality and guaranteeing the quality property of coal sample, has solved dead-soft structure coal well and has been difficult to get the core problem.

Summary of the invention

The technical issues that need to address of the present invention just are to overcome the defective of prior art; A kind of structure coal sampling method is provided; Mainly be applicable to the sampling of dead-soft coal seam; To solve the problem of coal sample damage, adopt the test specimen of this invention preparation and obtain the characteristic that parameter can reflect former coal petrography more really, guarantee to obtain the correlation test achievement of raw coal rock sample.

In order to achieve the above object, the present invention adopts following technical scheme:

1. choose the structure coal seam with one deck position at the scene, peel off the coal seam surface oxide layer, surface, smooth coal seam makes the coal seam Surface Vertical in top, base plate; Smear vegetable gum on the surface, coal seam of smooth mistake then;

2. on the surface, coal seam of smooth mistake, mark the coal core of diameter, be generally actual samples diameter 0.5-2 doubly greater than the actual samples diameter with white marking pen;

3. use explosion-proof electric drill along marking coal core girth outer rim, at interval 20mm boring, hole depth 120mm, aperture 2～8mm;

4. in the hole, inject vegetable gum, fill with aperture;

5. after waiting vegetable gum to solidify, use and extract coal sample greater than 1.3 times of explosion-proof electric drills of actual samples diameter;

6. adopt jump ring to block the coal core, make it to separate with coal body, pruning root again reverses;

7. after coal core root section forms, smear vegetable gum rapidly, itself and surrounding gas medium is isolated, then can stop the desorb of coal core gas and diffuse;

8. smear vegetable gum integral sealing coal core; Put into the protection capsule, prevent that the disturbance of handling process coal sample from destroying.

9. after in the laboratory, drilling through, cut into standard specimen or square test specimen, adopt vegetable gum to smear the whole surface of coal sample to keep structural intergrity, sealing rib outside prevents the gas escape.

10. repeat above-mentioned step, finish until whole specimen preparation.

The invention has the beneficial effects as follows:

1, a kind of preparation method of soft coal petrography test sample is simple and easy to do.Test specimen with this method preparation is tested the mechanical characteristic that the structure coal characteristic parameter that obtains can reflect former structure coal more really.

2, can prepare satisfy that cherry coal rock attribute testing requires cylindrical, cube and rectangular parallelepiped test specimen through this method.

3, with low cost.The test specimen preparation method is simple, has reduced cost effectively.

4, use test specimen that the present invention is prepared into and compare, more can embody structure coal actual physical mechanical characteristic with the test specimen of the existing method of reinventing preparation.

The present invention eliminates the damage that structure coal sampling process causes effectively, has solved the difficult problem of the former columnar structure coal sampling of dead-soft, has guaranteed the mechanical characteristic of the former columnar structure coal that test result reflected.

Embodiment

The specific embodiment of the invention comprises:

(1) choose structure coal seam with one deck position at the scene, peel off the coal seam surface oxide layer, and surface, careful smooth coal seam, the surface after smooth must vertical top, base plate; The spreading glue on surface, the coal seam of smooth mistake then is to keep sampling primitiveness;

(2) on the surface, coal seam of smooth mistake, mark the core of taking-up diameter with chalk greater than the actual samples diameter, be generally actual samples diameter 0.5-2 doubly;

(3) use explosion-proof electric drill along the girth outer rim that marks the coal core, at interval 20mm boring, hole depth 120mm, aperture 2～8mm;

(4) in the hole, inject vegetable gum, fill with aperture;

(5) etc. after vegetable gum solidifies, use and extract coal sample greater than 1.3 times of explosion-proof electric drills of actual samples diameter;

(6) adopt jump ring to block the coal core, make it to separate with coal body, pruning root again reverses;

(7) after coal core root section forms, spreading glue is isolated with itself and surrounding gas medium rapidly;

(8) smear vegetable gum integral sealing coal core; Put into the protection capsule, prevent that the disturbance of handling process coal sample from destroying.

(9) after in the laboratory, drilling through, cut into standard specimen or square test specimen, adopt vegetable gum to smear the whole surface of coal sample, prevent the gas escape to keep structural intergrity.

The above; Be merely the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technician who is familiar with the present technique field is in the technical scope that the present invention discloses; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.

Claims

1. construct the coal sampling method for one kind, it is characterized in that:

1. choose structure coal seam at the scene, peel off the coal seam surface oxide layer with one deck position, and surface, smooth coal seam, the coal seam Surface Vertical is in top, the base plate in tunnel; Smear vegetable gum on the surface, coal seam then;

2. on the surface, coal seam of smooth mistake, mark the coal sample of diameter, be generally actual samples diameter 0.5-2 doubly greater than the actual samples diameter with white marking pen;

3. use explosion-proof electric drill along the girth outer rim that marks coal sample, at interval 20mm boring, hole depth 120mm, aperture 2～8mm;

4. with in the vegetable gum injection hole;

5. after waiting vegetable gum to solidify, use and extract coal sample greater than 1.3 times explosion-proof electric drill of actual samples diameter;

6. block coal sample with jump ring, make it to separate with coal body, pruning root again reverses;

7. after the coal sample root section forms, on the coal sample root section, smear vegetable gum rapidly;

8. smear vegetable gum integral sealing coal sample, after vegetable gum solidifies, put into the protection capsule again;

9. transport to the laboratory at last, coal sample is drilled through, cuts into cylinder specimen or square test specimen after, smear the whole surface of coal sample with vegetable gum again;

10. repeat above-mentioned step, finish until all specimen preparations.