CN109632508A - A kind of test method of precise measurement Rock Under Uniaxial Compression tensile strength - Google Patents
A kind of test method of precise measurement Rock Under Uniaxial Compression tensile strength Download PDFInfo
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- CN109632508A CN109632508A CN201910015219.1A CN201910015219A CN109632508A CN 109632508 A CN109632508 A CN 109632508A CN 201910015219 A CN201910015219 A CN 201910015219A CN 109632508 A CN109632508 A CN 109632508A
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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
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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Abstract
The invention discloses a kind of test methods of precise measurement Rock Under Uniaxial Compression tensile strength, comprising the following steps: the rock of a variety of known uniaxial tensile strengths is made into hollow cylinder test specimen by 1.；2. hollow cylinder test specimen is placed on universal testing machine, tension test, pulling force when record test specimen destroys are carried out；3., using Rock Under Uniaxial Compression tensile strength as ordinate, drawing pulling force-tensile strength curve graph using pulling force as abscissa；4. preparing rock hollow cylinder test specimen to be measured；5. with step 2；6. finding out the corresponding Rock Under Uniaxial Compression tensile strength of pulling force with graphing method.The method of the present invention has the advantage that 1. present invention dexterously convert the mode of traditional uniaxial direct tensile cylindrical specimen test rock mechanics parameters to and stretches hollow cylinder test specimen, tests and is easy to implement.2. by one-to-one relationship, according to the pulling force measured it is known that the uniaxial tensile strength of test specimen.3. the present invention, without particular/special requirement, reduces the complexity for producing sample to sample.
Description
Technical field
The invention belongs to rock mechanics field more particularly to a kind of test methods for measuring Rock Under Uniaxial Compression tensile strength.
Background technique
Tensile Strength of Rock refers to the ability that rock sample resists tensile stress under the action of external load, exists for rock sample
The ratio of ultimate load and cross section under tension area when tensile failure.Rock type materials are frequently encountered in engineering construction,
Tensile strength mechanical performance index is design, examines, an important evidence of control and judge quality.Tensile strength is rock
A Controlling parameters of safety and stablization analysis in one of important mechanical performance index of stone and rock texture design.
The more significant feature of rock material is exactly that its tensile strength is more much smaller than its compression strength value, also stronger than its shearing resistance
Angle value is much smaller, thus the rock in the complex stress condition when destroying often on its ground by larger tensile stress
Fang Fasheng fracture, therefore in the mechanical property of rock, it is an importance for being worth research that tension, which is destroyed,.Rock tension is strong
Degree is one of the important technological parameters of rock engineering architectural design, and currently used Tensile Strength of Rock test is uniaxially stretched examination
It tests, Brazilian diametral compression test, three point loading bend tests, the common test method of these types all has been written to national regulation.
Uniaxial tensile test
The uniaxial direct tensile of rock is similar with the uniaxial direct tensile method of metal material, and test specimen is first processed into cylinder,
Middle part is cut again, the thick standard specimen in intermediate thin both ends is made, is then stretched with the both ends that fixture clamps test specimen,
Stress when test specimen is pulled off is the tensile strength sigma t of rock.
T=P/F × 10 σ (MPa)
Wherein: the pulling force (KN) when mono- test specimen of P is pulled off；
F-test specimen cross-sectional area (cm2)。
It has been generally acknowledged that the result of direct tensile test is more in line with the practical pulled condition of rock, but due to for directly drawing
The rock sample for stretching test is difficult to process, because rock belongs to fragile material, to be processed into the cylindrical specimens of dumbbell shaped
It is relatively time-consuming, and the yield rate processed is very low, while being difficult for the pulling force of fixture to be overlapped with the holding of the axis of test specimen.Cause
This, it is contemplated that above-mentioned direct tensile test is not simple and easy enough in the actual operation process, it is usually the case that using indirect
The method of tension test is as tensile test.
Brazilian diametral compression test
Disk diametral compression test is also known as Brazilian test (Brazilian test), and traditional test method will be by processing
Disc shaped test piece is placed between the bearing plate of press machine, and is respectively placed a diameter between sample and upper and lower bearing plate and be
The hard steel wire of 1mm is as filler strip.Filler strip is located on the axial plane of symmetry vertical with sample end face, it can become the pressure of application
Line load, so as to generate the tensile stress perpendicular to upper and lower load action direction inside sample.Destroy sample because of tensile stress,
Its tensile strength can be sought by formula.
The tensile strength (negative sign is tensile stress) of sample is represented by
σ t=- (2Pt)/π DL
In formula: σ t is Tensile Strength of Rock, and L is specimen length (thickness), and D is diameter, and Pt is breaking load.
But the condition of the experiment condition of Brazilian test and rock bearing tension damage has very big difference, result also with directly pass
System, which stretches, very big difference, so the reliability of the test result of Brazilian test is constantly subjected to the query of academia.In addition Brazilian
The discreteness of test is very big, and test lesser for repeatability is not applicable.
Therefore, it is necessary to design a kind of better test method to measure the uniaxial tensile strength of rock, it is above-mentioned to solve
Problem.
Technical problem to be solved by the present invention lies in provide a kind of simple, precise measurement Rock Under Uniaxial Compression tensile strength examination
Proved recipe method.
Summary of the invention
In view of the problems of the existing technology, the present invention provides a kind of test method, improves previous uniaxial tensile test and deposits
Difficulty technically, can precise measurement Rock Under Uniaxial Compression tensile strength, obtain Rock Under Uniaxial Compression tensile strength true value.
Compared with prior art, the present invention its remarkable advantage:
(1) the method for the present invention is implemented simple, does not need complicated instrument and equipment.
(2) test specimen in the method for the present invention is to process to obtain by standard machinery, and processing technology is extremely simple, can protect
The accuracy for demonstrate,proving experimental result, to guarantee the consistency of experimental result.
(3) the method for the present invention simplifies the processing technology of test specimen, reduces experimental cost.
(4) test is interfered smaller, and discreteness is smaller.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of test method of precise measurement Rock Under Uniaxial Compression tensile strength, comprising:
Step 1: the rock of a variety of known uniaxial tensile strengths is made into hollow cylinder test specimen；
Step 2: the hollow cylinder test specimen is placed on universal testing machine, passes through test specimen with nylon tape, nylon tape connects
It connects universal testing machine and carries out tension test, pulling force P when record test specimen destroys1、P2、P3..., Pi；
Step 3: pulling force P when being destroyed with test specimen1、P2、P3..., PiIt is vertical with Rock Under Uniaxial Compression tensile strength for abscissa
Coordinate establishes coordinate system, and the result of test is plotted in figure, and is connected each point with smooth curve, forms pulling force-tension
Intensity diagram；
Step 4: rock hollow cylinder test specimen to be measured is prepared；
Step 5: the hollow cylinder test specimen is placed on universal testing machine, passes through test specimen with nylon tape, nylon tape connects
It connects universal testing machine and carries out tension test, pulling force P when record test specimen destroysi+1；
Step 6: pulling force P is found out with graphing methodi+1Corresponding Rock Under Uniaxial Compression tensile strength.
Further, in step 1, the rock of a variety of known uniaxial tensile strengths, quantity should be according to the accurate of requirement of experiment
Degree is determined.
Further, in step 2, pulling force P1、P2、P3..., PiIt is obtained by universal testing machine.
Further, in step 3, pulling force-tensile strength curve graph can be continuously increased known uniaxial anti-by the later period
The Rock experiment of tensile strength increases accuracy.
The advantages of the present invention are:
1. the present invention dexterously converts stretching for the mode of traditional uniaxial direct tensile cylindrical specimen test rock mechanics parameters
Hollow cylinder test specimen tests and is easy to implement.
2. by one-to-one relationship, according to the pulling force measured it is known that the uniaxial tensile strength of test specimen.
3. the present invention, without particular/special requirement, reduces the complexity for producing sample to sample.
4. pulling force-tensile strength curve graph in the present invention can be continuously increased known uniaxial tensile strength by the later period
Rock experiment increases accuracy, and subsequent experimental does not need to repaint pulling force-tensile strength curve graph.
5. step of the present invention is simple, production is by current material and equipment, and low in cost, cost effectiveness is high, is suitable for big face
Product is promoted the use of.
Detailed description of the invention
The present invention is described in detail by following specific embodiment and attached drawing for ease of explanation,.
Fig. 1 is test specimen schematic diagram of the present invention；
Wherein, 1- nylon tape, 2- test specimen
Specific embodiment
Present invention implementation is specifically described below in conjunction with attached drawing.
Test specimen mentioned in the present invention is the rock specimens that need to be detected, the rock specimens be needed according to detection and
The rock specimens of manufactured regulation geomery.
As shown in Figure 1, test specimen schematic diagram of the present invention.Including nylon tape 1 and test specimen 2.
Step 1: the rock of a variety of known uniaxial tensile strengths is made into test specimen 2；
Step 2: institute's test specimen 2 is placed on universal testing machine, test specimen 2 is passed through with nylon tape 1, with nylon band connection ten thousand
Energy testing machine carries out tension test, pulling force P when record test specimen destroys1、P2、P3..., Pi；
Step 3: pulling force P when being destroyed with test specimen1、P2、P3..., PiIt is vertical with Rock Under Uniaxial Compression tensile strength for abscissa
Coordinate establishes coordinate system, and the result of test is plotted in figure, and is connected each point with smooth curve, forms pulling force-tension
Intensity；
Step 4: rock sample 2 to be measured is prepared；
Step 5: the test specimen 2 is placed on universal testing machine, test specimen 2 is passed through with nylon tape 1, with nylon band connection
Universal testing machine carries out tension test, pulling force P when record test specimen destroysi+1；
Step 6: pulling force P is found out with graphing methodi+1Corresponding Rock Under Uniaxial Compression tensile strength.
Further, the nylon tape 1 in the step 1, to there is the flexible-belt of one fixed width and intensity；The test specimen 2,
For the test specimen processed according to certain size；Preferably, 2 size of test specimen is uniformly processed as overall diameter 5cm, interior diameter 2cm, long
Spend 10cm.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications that can be made or variation still within protection scope of the present invention.
Claims (4)
1. a kind of test method of precise measurement Rock Under Uniaxial Compression tensile strength, comprising:
Step 1: the rock of a variety of known uniaxial tensile strengths is made into hollow cylinder test specimen as shown in Fig. 1；
Step 2: the hollow cylinder test specimen is placed on universal testing machine, carries out tension test, when record test specimen destroys
Pulling force P1、P2、P3..., Pi；
Step 3: pulling force P when being destroyed with test specimen1、P2、P3..., PiFor abscissa, using Rock Under Uniaxial Compression tensile strength as ordinate
Coordinate system is established, the result of test is plotted in figure, and is connected each point with smooth curve, forms pulling force-tensile strength
Curve graph；
Step 4: rock hollow cylinder test specimen to be measured is prepared；
Step 5: the hollow cylinder test specimen to be measured is placed on universal testing machine, carries out tension test, and record test specimen destroys
When pulling force Pi+1；
Step 6: pulling force P is found out with graphing methodi+1Corresponding Rock Under Uniaxial Compression tensile strength.
2. the method as described in claim 1, it is characterized in that: the rock of a variety of known uniaxial tensile strengths, quantity are answered
It is determined according to the accuracy of requirement of experiment.
3. the method as described in claim 1, it is characterized in that: the pulling force P1、P2、P3..., PiIt is obtained by universal testing machine
?.
4. the method as described in claim 1, it is characterized in that: the pulling force-tensile strength curve graph, it can be by the later period not
The disconnected Rock experiment for increasing known uniaxial tensile strength increases accuracy.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110160871A (en) * | 2019-06-12 | 2019-08-23 | 辽宁科技大学 | A kind of corn stubble fibrous root radial direction tensile strength measuring device |
| CN111157344A (en) * | 2020-01-06 | 2020-05-15 | 中南大学 | Device and method for measuring tensile strength of rock |
| CN111366461A (en) * | 2020-04-13 | 2020-07-03 | 鲁东大学 | Method for testing tensile strength of rock |
| CN113188906A (en) * | 2021-04-25 | 2021-07-30 | 重庆科技学院 | Rock uniaxial tension test device and method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110160871A (en) * | 2019-06-12 | 2019-08-23 | 辽宁科技大学 | A kind of corn stubble fibrous root radial direction tensile strength measuring device |
| CN110160871B (en) * | 2019-06-12 | 2024-04-09 | 辽宁科技大学 | Radial tensile strength measuring device of corn root stubble fibrous root |
| CN111157344A (en) * | 2020-01-06 | 2020-05-15 | 中南大学 | Device and method for measuring tensile strength of rock |
| CN111366461A (en) * | 2020-04-13 | 2020-07-03 | 鲁东大学 | Method for testing tensile strength of rock |
| CN111366461B (en) * | 2020-04-13 | 2023-02-03 | 鲁东大学 | Method for testing tensile strength of rock |
| CN113188906A (en) * | 2021-04-25 | 2021-07-30 | 重庆科技学院 | Rock uniaxial tension test device and method |
| CN113188906B (en) * | 2021-04-25 | 2022-05-20 | 重庆科技学院 | Rock uniaxial tension test device and method |
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Application publication date: 20190416 |