CN105352884A - Experiment method and experiment member for testing bond strength of concrete and coal, rock or concrete - Google Patents
Experiment method and experiment member for testing bond strength of concrete and coal, rock or concrete Download PDFInfo
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- CN105352884A CN105352884A CN201510260792.0A CN201510260792A CN105352884A CN 105352884 A CN105352884 A CN 105352884A CN 201510260792 A CN201510260792 A CN 201510260792A CN 105352884 A CN105352884 A CN 105352884A
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Abstract
The present invention relates to the field of mechanical property testing of concrete, and discloses a method for testing bond strength of the concrete and coal, rock or concrete, the method comprises the steps of in situ drilling of a specimen to be bonded, production and conservation of the specimen to be bonded, anchoring of the specimen, mounting of the specimen, opposite-pulling, reading and calculation of the bond strength; the present invention also discloses an experiment member for testing the bond strength of the concrete and the coal, rock or concrete, the experiment member comprises two bonding cylinders and two pulling rods, one ends of the bonding cylinders are provided with threaded holes, one ends of the pulling rods are provided with external threads, the bonding cylinders and the pulling rods are threaded in connection, and the bonding cylinders respectively sleeve both ends of the specimen to be tested. The experiment method and the experiment member can simply and quickly directly measure the bond strength of the concrete and a spray object.
Description
Technical field
The present invention relates to mechanical performance of concrete experimental technique field, particularly relate to a kind of experimental technique and the component of testing concrete and coal, rock or concrete cohesive strength.
Background technology
Bolt-spray support is the main technology of mine shaft, pit bottom and main developing, preparatory workings permanent supporting.In underworkings working-yard, after concrete ejection to the roadway surrounding rock surface condensation sclerosis of having excavated, with country rock tight bond, cover and be integrated.In addition, the concrete of down-hole certain thickness (as 200mm) is not an injection molding, but layering gradation (each 50mm) injection, on the surface of contact of the two, also there is certain bonding phenomenon with the concrete first sprayed in the concrete of spray like this; This concrete is with to spray the cohesive strength of object most important, and cohesive strength is too small or lose, and concrete is easily peeled off with country rock, ftractureed, and cannot play its occluded air, moisture and support the effect of country rock; Cohesive strength is excessive, causes waste of material, and support cost rises, and increases roadway support quantities, affects the duration.Therefore, accurately the cohesive strength of test concrete and coal body, rock mass and concrete body, very necessary to Concrete Injection Rock Bolting Design In Openings.
At present, the bond strength testing method that home and abroad colliery generally adopts is Split-tension of Rolled method and bores core hubbing.These two kinds of methods respectively have relative merits, but have a common issue to be that cohesive strength is obtained indirectly by test findings, and this inevitably causes the inaccurate of test figure and discreteness.Further, the test unit of these two kinds of methods is complicated, and sample dimensions is huge, and time consumption of experimental process is required great effort, and particularly the latter will use motor in sampling process.As everyone knows, down-hole geologic media is complicated, gas bearing, and require high to testing equipment explosion proof ratings, particularly for high methane or coal and gas outburst mine, the pull-out test carrying out being energized in tunnel can cause potential danger to downhole safety.Given this, in order to more directly, easier, the adhesive property of more safely studying sprayed concrete and coal and rock, be necessary to improve above-mentioned two kinds of methods, experimental member redesigned.
Summary of the invention
(1) technical matters that will solve
The technical problem to be solved in the present invention how directly to record concrete and the cohesive strength of spraying object quickly and easily.
(2) technical scheme
In order to solve the problems of the technologies described above, the invention provides a kind of experimental technique testing concrete and coal, rock or concrete cohesive strength, it comprises the steps:
S1, scene drill through bonded test specimen: drill through right cylinder coal respectively at underground coal mine, right cylinder rock and drill through right cylinder concrete, as bonded test specimen spraying concrete position;
The making of S2, bonding testing piece and maintenance: adopt right cylinder die trial, bottom right cylinder die trial, first put into the bonded test specimen that S1 obtains, then in described right cylinder die trial, the laboratory fresh concrete that mixing is good is in advance filled up, put vibration compacting on a vibration table, a marking line is drawn in the two abutting edge after concrete initial set, to show adhesive surface, be finally placed on mark and support indoor maintenance, finally make bonding testing piece;
S3, anchoring test specimen: first in two bonding cylinders, add appropriate cementing agent respectively, then the one end of the bonding testing piece obtained in S2 is put into one of them bonding cylinder, the other end of described bonding testing piece puts into another bonding cylinder, guarantee bonding testing piece axis and bonding cylinder axis point-blank, to be bonded dose solidify after, two bonding cylinders one end load onto pull bar respectively;
S4, installation test specimen: the anchoring test specimen that S3 is obtained is arranged on mechanics machine, and the entablature chuck of mechanics machine clamps one end pull bar of anchoring test specimen, and sill chuck clamps the other end pull bar of anchoring test specimen, ensure during installation that anchoring test specimen is vertical;
S5, to drawing: start mechanics machine, sill moved down, and keep test specimen by continuous uniform to drawing, simultaneously observe pressure gauge reading change, until test specimen is pulled off;
S6, reading: when test specimen is pulled off, pressure gauge reading no longer changes, now stop force, finally record tensile load;
S7, calculating cohesive strength: according to formula
calculate the cohesive strength of concrete and rock mass, coal body or concrete body; In formula,
F
b---the cohesive strength of concrete and rock mass, coal body or concrete body, MPa;
F---load of tensioning when test specimen is pulled off, KN;
The area of fracture of A---test specimen, m
2;
The rupture surface of α---test specimen and the angle of test specimen xsect, get 0 °.
Wherein, in step S3, cementing agent adopts polyurethane adhesive, and cohesive strength is not less than 5MPa, and setting time is no more than 30s.
The present invention also provides a kind of experimental member of testing concrete and coal, rock or concrete cohesive strength, it comprises two bonding cylinders and two pull bars, one end of described bonding cylinder is provided with threaded hole, one end of described pull bar is provided with external thread, described pull bar and described bonding cylinder are threaded connection, and two described bonding cylinders are sheathed on the two ends of test specimen respectively.
Wherein, one end that described bonding cylinder is relative with being provided with threaded hole is uncovered setting.
Wherein, the threaded hole size on two described bonding cylinders is identical, position is relative.
Wherein, described bonding cylinder and pull bar are made up of cast steel.
(3) beneficial effect
Compared with prior art, the present invention has the following advantages:
A kind of experimental technique testing concrete and coal, rock or concrete cohesive strength provided by the invention, experiment essence is axle daraf(reciprocal of farad), by to the cohesive body drawing concrete and coal, rock, concrete block, directly draw the cohesive strength of the two, the Split-tension of Rolled method that the accuracy of experimental data is more traditional is high with brill core hubbing, experimentation is time saving and energy saving, and experimental result is accurately easy to get;
A kind of experimental member of testing concrete and coal, rock or concrete cohesive strength provided by the invention, two bonding cylinders and pull bar are all processed by common steel cylinder and rod iron, the two ubiquity in actual life, draw materials conveniently, with low cost, and the processing technology of steel cylinder and rod iron is simple, easily shaping;
Bonding cylinder and pull bar are mechanically connected by screw thread, and structure is simple, easy to use, without the need to electricity consumption, avoid and produce spark when underground coal mine is applied and cause potential safety hazard.
Accompanying drawing explanation
Fig. 1 is the integral installation structural representation of experimental member of the present invention;
Fig. 2 is the bonding cylinder of experimental member of the present invention and the annexation schematic diagram of pull bar.
In figure: 1: concrete; 2: bonded test specimen; 3: bonding cylinder; 4: pull bar; 5: cementing agent; 6: adhesive surface.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following instance for illustration of the present invention, but is not used for limiting the scope of the invention.
In describing the invention, it should be noted that, term " " center ", " longitudinal direction ", " transverse direction ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", orientation or the position relationship of the instruction such as " outward " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the component of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.
In describing the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, concrete condition above-mentioned term concrete meaning in the present invention can be understood.
The invention provides a kind of experimental technique testing concrete and coal, rock or concrete cohesive strength, it comprises the steps:
S1, scene drill through bonded test specimen 2: choose typical tunnel at underground coal mine, the bonded test specimen 2 of right cylinder coal, right cylinder rock is drilled through respectively in the firm position disclosing country rock, and the bonded test specimen 2 of right cylinder concrete (concrete) is drilled through in the position of spraying concrete 1, preferably, bonded test specimen 2 diameter is 50mm, and length is not less than 100mm; For simulated field situation, test coal, rock and concrete test specimen adopt the most general material of current down-hole application to drill and form;
The making of S2, bonding testing piece and maintenance: adopt right cylinder die trial, bottom right cylinder die trial, first put into the bonded test specimen 2 that S1 obtains, then in described right cylinder die trial, fill up the fresh concrete 1 of laboratory mixing, put vibration compacting on a vibration table, a marking line is drawn in the two abutting edge after concrete 1 initial set, to show adhesive surface 6, be finally placed on mark and support indoor maintenance, finally make bonding testing piece;
S3, anchoring test specimen: first in two bonding cylinders 3, add appropriate cementing agent 5 respectively, then the one end of the bonding testing piece obtained in S2 is put into one of them bonding cylinder 3, the other end of described bonding testing piece puts into another bonding cylinder 3, guarantee bonding testing piece axis and bonding cylinder 3 axis point-blank, after solidifying for be bonded dose 5, load onto pull bar 4 in one end of bonding cylinder 3;
S4, installation test specimen: the anchoring test specimen that S3 is obtained is arranged on mechanics machine, tensioning equipment adopts WE-300B type fluid pressure type mechanics machine, the stretch-draw to test specimen is realized by moving up and down between entablature and moving beam, the entablature chuck of mechanics machine is clamped one end pull bar 4 of anchoring test specimen, sill chuck clamps the other end pull bar 4 of anchoring test specimen, ensure during installation that anchoring test specimen is vertical, avoid bias, in Fig. 1, direction shown in arrow is the action direction of tensile force f;
S5, to drawing: start mechanics machine, sill is moved down, speeds control at 0.5 ~ 1.0MPa/s, and keeps test specimen by continuous uniform to drawing, simultaneously observe pressure gauge reading change, until test specimen is pulled off;
S6, reading: when test specimen is pulled off, pressure gauge reading no longer changes, now stop force, finally record tensile load;
S7, calculating cohesive strength: according to formula
calculate the cohesive strength of concrete 1 and rock mass, coal body or concrete body; In formula,
F
b---the cohesive strength of concrete 1 and rock mass, coal body or concrete body, MPa;
F---load of tensioning when test specimen is pulled off, KN;
The area of fracture of A---test specimen, m
2;
The rupture surface of α---test specimen and the angle of test specimen xsect, get 0 °.
Wherein, in step S3, cementing agent 5 adopts polyurethane adhesive, and cohesive strength is not less than 5MPa, and setting time is no more than 30s.
Test concrete 1 of the present invention is utilized to carry out the result of calculation of a kind of embodiment tested in table 1 with the experimental technique of coal, rock or concrete cohesive strength:
The bonding strength test result of table 1 concrete 1 and rock, coal and concrete 1
Single test is complete.By to the cohesive body drawing concrete 1 and coal, rock, concrete block, directly draw the cohesive strength of the two, the Split-tension of Rolled method that the accuracy of experimental data is more traditional and to bore core hubbing high, experimentation is time saving and energy saving, and experimental result is accurately easy to get.
As depicted in figs. 1 and 2, present invention also offers a kind of experimental member of testing concrete 1 and coal, rock or concrete cohesive strength, it comprises two bonding cylinders 3 and two pull bars 4, one end of described bonding cylinder 3 is provided with threaded hole, one end of described pull bar 4 is provided with external thread, described pull bar 4 is threaded connection with described bonding cylinder 3, two described bonding cylinders 3 are sheathed on the two ends of test specimen respectively, with connecting bonding cylinder 3 with externally threaded pull bar 4, with mechanics machine to drawing two ends pull bar 4, gained stretching force is the two cohesive strength.
For the ease of installing, one end that described bonding cylinder 3 is relative with being provided with threaded hole is uncovered setting.
In order to ensure centering, guarantee test specimen axis and bonding cylinder 3 axis point-blank, the threaded hole size on two described bonding cylinders 3 is identical, position is relative.
Wherein, described bonding cylinder 3 and pull bar 4 are formed from steel.Preferably, bonding cylinder 3 is steel hollow cylinder, and internal diameter 50mm, external diameter 65mm, wall thickness 15mm, axial length 80mm, top is uncovered, and bottom has the screwed hole of centre (for cylinder lever connecting rod 4) that a diameter is 25mm.Pull bar 4 is preferably the steel cylinder of diameter 25mm, long 120mm.
Two bonding cylinders 3 and pull bar 4 are all processed by common steel cylinder and rod iron, and the two is ubiquity in actual life, draw materials conveniently, with low cost, and the processing technology of steel cylinder and rod iron is simple, easily shaping; Bonding cylinder 3 and pull bar 4 are mechanically connected by screw thread, and structure is simple, easy to use, without the need to electricity consumption, avoid and produce spark when underground coal mine is applied, and cause potential safety hazard.
As can be seen from the above embodiments, the present invention directly can record concrete 1 and the cohesive strength of spraying object quickly and easily, and test accurately.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. test an experimental technique for concrete and coal, rock or concrete cohesive strength, it is characterized in that, comprise the steps:
S1, scene drill through bonded test specimen: drill through right cylinder coal, right cylinder rock respectively at underground coal mine and drill through right cylinder concrete spraying concrete position, as the bonded test specimen of experiment;
The making of S2, bonding testing piece and maintenance: adopt right cylinder die trial, bottom right cylinder die trial, first put into the bonded test specimen that S1 obtains, then in described right cylinder die trial, the prefabricated fresh concrete in laboratory is filled up, put vibration compacting on a vibration table, a marking line is drawn in the two abutting edge after concrete initial set, to show adhesive surface, be finally placed on mark and support indoor maintenance, finally make bonding testing piece;
S3, anchoring test specimen: first in two bonding cylinders, add appropriate cementing agent respectively, then the one end of the bonding testing piece obtained in S2 is put into one of them bonding cylinder, the other end of described bonding testing piece puts into another bonding cylinder, guarantee bonding testing piece axis and bonding cylinder axis point-blank, to be bonded dose solidify after, two bonding cylinders one end load onto pull bar respectively;
S4, installation test specimen: the anchoring test specimen that S3 is obtained is arranged on mechanics machine, and the entablature chuck of mechanics machine is clamped one end pull bar of anchoring test specimen, sill chuck clamps the other end pull bar of anchoring test specimen, ensure during installation that anchoring test specimen is vertical;
S5, to drawing: start mechanics machine, sill moved down, and keep test specimen by continuous uniform to drawing, simultaneously observe pressure gauge reading change, until test specimen is pulled off;
S6, reading: when test specimen is pulled off, pressure gauge reading no longer changes, now stop force, finally record tensile load;
S7, calculating cohesive strength: according to formula
calculate the cohesive strength of concrete and rock mass, coal body or concrete body; In formula,
F
b---the cohesive strength of concrete and rock mass, coal body or concrete body, MPa;
F---load of tensioning when test specimen is pulled off, KN;
The area of fracture of A---test specimen, m
2;
The rupture surface of α---test specimen and the angle of test specimen xsect, get 0 °.
2. the experimental technique of test concrete as claimed in claim 1 and coal, rock or concrete cohesive strength, is characterized in that, in step S3, cementing agent adopts polyurethane adhesive, and cohesive strength is not less than 5MPa, and setting time is no more than 30s.
3. test the experimental member of concrete and coal, rock or concrete cohesive strength for one kind, it is characterized in that, comprise two bonding cylinders and two pull bars, one end of described bonding cylinder is provided with threaded hole, one end of described pull bar is provided with external thread, described pull bar and described bonding cylinder are threaded connection, and two described bonding cylinders are sheathed on the two ends of test specimen respectively.
4. the experimental member of test concrete as claimed in claim 3 and coal, rock or concrete cohesive strength, it is characterized in that, one end that described bonding cylinder is relative with being provided with threaded hole is uncovered setting.
5. the experimental member of test concrete as claimed in claim 3 and coal, rock or concrete cohesive strength, it is characterized in that, the threaded hole size on two described bonding cylinders is identical, position is relative.
6. the experimental member of test concrete as claimed in claim 3 and coal, rock or concrete cohesive strength, it is characterized in that, described bonding cylinder and pull bar are made up of cast steel, and compressive strength is not less than 235MPa.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105784589A (en) * | 2016-03-10 | 2016-07-20 | 中国矿业大学 | Method for testing binding force of anchoring agent and rock interface |
| FR3054038A1 (en) * | 2016-07-13 | 2018-01-19 | Aia Ingenierie | METHOD FOR DETERMINING PARAMETERS DEFINING COHESIVE LAWS REPRESENTING THE BEHAVIOR OF A MORTAR JOINT BETWEEN TWO STONES |
| CN107677596A (en) * | 2017-09-30 | 2018-02-09 | 华北水利水电大学 | The method of indoor test rock and concrete binding interface tensile strength |
| CN107727569A (en) * | 2017-09-30 | 2018-02-23 | 华北水利水电大学 | A kind of test method for testing rock and concrete binding interface tensile strength |
| CN110108529A (en) * | 2019-05-13 | 2019-08-09 | 河海大学 | A kind of rocks-concrete assembly preparation method of sample |
| CN110196225A (en) * | 2019-06-25 | 2019-09-03 | 河南理工大学 | A kind of rock and gunite concrete contact surface adhesion strength test device and test method |
| CN110514585A (en) * | 2019-09-10 | 2019-11-29 | 中国水利水电第五工程局有限公司 | A kind of gunite concrete and country rock adhesion strength measurement device |
| CN111766200A (en) * | 2020-06-29 | 2020-10-13 | 中国人民解放军陆军工程大学 | Test device and method for measuring dynamic bonding strength of sprayed concrete under blasting disturbance |
| CN111896546A (en) * | 2020-07-02 | 2020-11-06 | 上海市建筑科学研究院有限公司 | New and old concrete joint surface quality detection method based on drilling and core drilling sampling |
| CN112878986A (en) * | 2021-01-22 | 2021-06-01 | 西南石油大学 | Device and method for testing mechanical property and sealing property of cement sheath-formation interface of oil and gas well |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105784589A (en) * | 2016-03-10 | 2016-07-20 | 中国矿业大学 | Method for testing binding force of anchoring agent and rock interface |
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| CN110196225B (en) * | 2019-06-25 | 2022-03-01 | 河南理工大学 | Device and method for testing bonding strength of rock and sprayed concrete contact surface |
| CN110514585A (en) * | 2019-09-10 | 2019-11-29 | 中国水利水电第五工程局有限公司 | A kind of gunite concrete and country rock adhesion strength measurement device |
| CN111766200A (en) * | 2020-06-29 | 2020-10-13 | 中国人民解放军陆军工程大学 | Test device and method for measuring dynamic bonding strength of sprayed concrete under blasting disturbance |
| CN111896546A (en) * | 2020-07-02 | 2020-11-06 | 上海市建筑科学研究院有限公司 | New and old concrete joint surface quality detection method based on drilling and core drilling sampling |
| CN112878986A (en) * | 2021-01-22 | 2021-06-01 | 西南石油大学 | Device and method for testing mechanical property and sealing property of cement sheath-formation interface of oil and gas well |
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