CN105527172B - A kind of device and assay method for measuring ground cylinder sample Shear Strength Index - Google Patents
A kind of device and assay method for measuring ground cylinder sample Shear Strength Index Download PDFInfo
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- CN105527172B CN105527172B CN201610002367.6A CN201610002367A CN105527172B CN 105527172 B CN105527172 B CN 105527172B CN 201610002367 A CN201610002367 A CN 201610002367A CN 105527172 B CN105527172 B CN 105527172B
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- 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
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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Abstract
A kind of device for measuring ground cylinder sample Shear Strength Index, it includes horizontal base, multiple roller bearings is provided with the upper horizontal plane of horizontal base；Ground cylinder sample shearing component is placed with multiple roller bearings；In ground cylinder sample shearing component, the upper half circular groove for being carved with angle dial is fixedly installed in below pressure-bearing surface by fastening bolt.A kind of device and assay method for measuring ground cylinder sample Shear Strength Index provided by the invention, solves the Shear Strength Index that existing apparatus cannot measure cylinder ground, can not be at the same time to soil sample to test the defects of, by testing twice, the Shear Strength Index of ground can directly be calculated, easy to operate, test process is quickly time saving, provides convenience for engineering practice.
Description
Technical field
The present invention relates to a kind of device and assay method for measuring ground cylinder sample Shear Strength Index.
Background technology
With the development of science and technology the Shear Strength Index assay method of ground also gradually increases, it is common to there is direct shear apparatus (to cut
Cut box) compression-shear test (single shear), cube specimen single side scissor test, the two-sided scissor test of test piece end compression, the examination of angle mould compression shear
Test (different angle shearing testing) etc., the sample of these experimental tests is all square, it is impossible to measures cylinder rock soil classifiction
Index, can not test soil sample.How both simple economy and can comparatively fast obtain cylinder rock soil classifiction
Index is the original intention of the present invention.It is known that cohesive strength c and internal friction angleThe size of ground shearing strength is reflected, is ground
Very important mechanical performance index.
Common test method (direct shear apparatus (shear box) compression-shear test (single shear), cube specimen single side scissor test, examination
The two-sided scissor test of part end capacity compression, angle mould compression-shear test (different angle shearing testing)) there are following defect：
1st, using square sample.And drill sampling is all cylindrical specimens to engineering in practice.
2nd, it is only capable of testing rock sample, it is impossible to while soil sample is also tested.
3rd, during final shearing, shearing seam does not uniquely determine, and causes theoretical value and actual value to have relatively large deviation.
4th, the use of the sample of shearing is all same specification, and shearing inclination scope is more narrow and small.
The content of the invention
The technical problems to be solved by the invention be to provide it is a kind of measure ground cylinder sample Shear Strength Index device and
Assay method, solves the Shear Strength Index that existing apparatus cannot measure cylinder ground, can not at the same time soil sample is come into
The defects of row test, by testing twice, you can directly calculate the Shear Strength Index of ground, easy to operate, test process
It is quick time saving, provide convenience for engineering practice.
In order to solve the above technical problems, the technical solution adopted in the present invention is：One kind measure ground cylinder sample shearing resistance is strong
The device of index is spent,
It includes horizontal base, and multiple roller bearings are provided with the upper horizontal plane of horizontal base；
Ground cylinder sample shearing component is placed with multiple roller bearings；
In ground cylinder sample shearing component, the upper half circular groove for being carved with angle dial is fixedly mounted by fastening bolt
Below pressure-bearing surface, pressure-bearing surface is equipped with and the matched arrow of angle index, lower half round recessed and upper half circular groove
Splice and combine to form a cylinder, the middle part of cylinder forms the dress sample groove for placing ground cylinder sample, fills and is placed with sample groove
At least one sample set, sample set are made of two semicircle body splicings, the splicing of lower half round recessed and upper half circular groove
Place forms ratcheting seam；Lower half circle bottom portion of groove along the circumferential direction offers multiple angle indexes with upper half circular groove and matches
The mounting hole of conjunction, shear box are fixed on lower half round recessed by the thin plate and mounting hole of strap bolt；
The shear box of ground cylinder sample shearing component is placed on multiple roller bearings of horizontal base；
Very heavy pressure end is provided with pressure-bearing surface.
The quantity of sample set is multiple, and pivot bush unit is in dress sample groove.
The left end of horizontal base is concordant with the left end of shear box, and the right end of horizontal base is with the outer ring of lower half round recessed same
On one vertical plane.
A kind of method using above device measure ground cylinder sample Shear Strength Index, this method comprise the following steps：
1) ground cylinder sample is arranged；
2) when ground cylinder sample is not placed in calculating, ratcheting seam and horizontal base when upper half circular groove and lower half round recessed splice
The base angle a of seat, during 50 °≤a≤70 °, when angle a for any value in above-mentioned number range when corresponding amendment just should
Power △ σ and the value for correcting shear stress △ τ,
Correct direct stress △ σ=Fcos a/dl
Correct shear stress △ τ=Fsin a/dl
Wherein, d is ground cylinder sample diameter, and l is ground cylinder sample height,
Obtain above device and be not added with ground cylinder sample, the amendment Value Data of angle a pressure under different angle；
3) sample is filled for the first time：Ground cylinder sample is put into dress sample groove, upper half circular groove and lower half round recessed are spliced
It is fixed, the base angle a of ratcheting seam and horizontal base when splicing upper half circular groove and lower half round recessed1, 50 °≤a1
≤70°；
4) shear for the first time：Be further applied load by very heavy pressure end to ground cylinder sample, until ground cylinder sample just by
Cut up, write down pressure value F at this time1, at this time
Direct stress
Shear stress
Wherein, d is ground cylinder sample diameter, and l is ground cylinder sample height；
5) second of dress sample：The ground cylinder sample that has cut up in sample groove will be filled to remove, load into dress sample groove another with
The ground cylinder sample that step 3) uses is with a batch of ground cylinder sample, then adjusts upper half circular groove and lower half round recessed position
Put, upper half circular groove and the splicing of lower half round recessed are fixed, ratcheting seam when splicing upper half circular groove and lower half round recessed
With the base angle a of horizontal base2, 50 °≤a2≤ 70 °, a1≠a2；
6) shear for second：Be further applied load by very heavy pressure end to ground cylinder sample, until ground cylinder sample just by
Cut up, write down pressure value F at this time2, at this time
Direct stress
Shear stress
Wherein, d is ground cylinder sample diameter, and l is ground cylinder sample height；
7) analysis and arrangement obtained experimental data, according to the shear strength formula of Coulomb's lawPass through
Column calculates, and the amendment data of gained in step 2) are substituted into following formula, obtains the shearing strength cohesive force c of the rock sample
And internal friction angleNumerical value
Wherein, d is ground cylinder sample diameter, and l is ground cylinder sample height；
Δσ0And Δ τ0Angle a=a during for without rock sample1When, the correction value that is calculated by step 2)；
Δσ0' and Δ τ0' for without rock sample when angle a=a2When, the correction value that is calculated by step 2)；
Obtain the Shear Strength Index of ground cylinder sample.
In step 2), calculate corresponding amendment direct stress △ σ and amendment when angle a is 50 °, 55 °, 60 °, 65 ° and 70 ° and cut
The value of stress △ τ.
In step 4) and step 6), when being further applied load by very heavy pressure end to ground cylinder sample, very heavy pressure end with
The speed of 0.02KN/s is downwardly applied to load, until rock sample is just cut up.
In step 5), second muck sample does not use new rock sample, and uses the rock sample cut off for the first time passing through glue
Rock sample after bonding.
A kind of device and assay method for measuring ground cylinder sample Shear Strength Index provided by the invention, solves existing
Device cannot measure the Shear Strength Index of cylinder ground, can not at the same time to soil sample to test the defects of, pass through two
Secondary test, you can directly calculate the Shear Strength Index of ground, easy to operate, test process is quickly time saving, is engineering practice
Provide convenience.
Brief description of the drawings
The invention will be further described with reference to the accompanying drawings and examples：
Fig. 1 is apparatus of the present invention structure diagram；
Fig. 2 is the schematic diagram of apparatus of the present invention pressure-bearing surface；
Fig. 3 is the schematic diagram of apparatus of the present invention thin plate；
Fig. 4 is the schematic diagram of apparatus of the present invention upper half circular groove and lower half round recessed；
Fig. 5 is that the method for the present invention step 4) fills the force diagram sheared for the first time after sample；
Fig. 6 is the force diagram that the method for the present invention step 6) fills second of shearing after sample.
Embodiment
Embodiment one
As shown in Figs 1-4, a kind of device for measuring ground cylinder sample Shear Strength Index,
It includes horizontal base 13, and multiple roller bearings 12 are provided with the upper horizontal plane of horizontal base 13；
Ground cylinder sample shearing component is placed with multiple roller bearings 12；
In ground cylinder sample shearing component, the upper half circular groove 4 for being carved with angle dial 3 is fixed by fastening bolt 14
The lower section of pressure-bearing surface 2 is installed on, pressure-bearing surface 2 is equipped with and the matched arrow of angle index, lower half round recessed 6 and upper semi-circle
Connected in star 4 splices and combines to form a cylinder, and the middle part of cylinder forms the dress sample groove 7 for placing ground cylinder sample, dress sample groove 7
At least one sample set 8 is inside placed with, sample set 8 is made of two semicircle body splicings, and lower half round recessed 6 is circular with upper half
The stitching portion of groove 4 forms ratcheting seam 5；6 bottom of lower half round recessed is along the circumferential direction offered on multiple and upper half circular groove 4
The matched mounting hole 9 of angle index, shear box 10 is fixed on lower half round recessed by the thin plate 11 and mounting hole 9 of strap bolt
On 6；
The shear box 10 of ground cylinder sample shearing component is placed on multiple roller bearings 12 of horizontal base 13；
Very heavy pressure end 1 is provided with pressure-bearing surface 2.
The quantity of sample set 8 is multiple, and pivot bush unit is in dress sample groove 7.
The left end of horizontal base 13 is concordant with the left end of shear box 10, right end and the lower half round recessed 6 of horizontal base 13
Outer ring is on same vertical plane.
Embodiment two
The installation process of above device is as follows：
Pressure-bearing surface 2 and upper half circular groove 4 are first pressed into pre-designed angle (upper half circular groove and lower half round recessed
The base angle a of ratcheting seam 5 and horizontal base during splicing, adjusts according to arrow meaning angle by 50 °≤a≤70 °),
Connected together by fastening bolt 14, then according to 4 designed angle of upper half circular groove, by lower half round recessed 6 and shearing
Box 10 turns to corresponding angle, is allowed to coincide with upper half circular groove 4；
Then by lower half round recessed 6 and shear box 10 by being fastened on by the thin plate 11 and mounting hole 9 of strap bolt
Together；
When carrying out ground cylinder sample shearing test,
Ready rock sample is put into 6 in lower half groove, can be by increasing different-diameter if the diameter of rock sample is smaller
The quantity of steel bushing 8 makes rock sample and the entirety of steel bushing 8 just to contact with lower half round recessed 6；
Upper half circular groove 4 and pressure-bearing surface 2 are covered on the entirety that rock sample 7 and lower half round recessed 6 form；；Ground
Cylinder sample shearing component is completed, then ground cylinder sample shearing component is positioned on roller bearing 12, and whole device is completed.
Power straight down is applied by exterior very heavy pressure end 1, make upper half circular groove 4 and lower half round recessed 6 it
Between occur the relative shear changing of the relative positions, rock sample i.e. cut up.
Embodiment three
A kind of method using above device measure ground cylinder sample Shear Strength Index, this method comprise the following steps：
1) ground cylinder sample is arranged：Determine the rock that will be tested, rock surface to be measured is cleaned up with dry hairbrush
Chip, dust, and by the grinding two end surfaces of rock, ground cylinder sample is made；
2) when ground cylinder sample is not placed in calculating, upper half circular groove 4 and lower half round recessed 6 ratcheting seam 5 and water when splicing
The base angle a of flat bed 13, during 50 °≤a≤70 °, as angle a corresponding to be repaiied during any value in above-mentioned number range
Values of the positive direct stress △ σ with correcting shear stress △ τ,
Correct direct stress △ σ=Fcos a/dl
Correct shear stress △ τ=Fsin a/dl
Wherein, d is ground cylinder sample diameter, and l is ground cylinder sample height,
Obtain above device and be not added with ground cylinder sample, the amendment Value Data of angle a pressure under different angle；
3) sample is filled for the first time：Ground cylinder sample is put into dress sample groove 7, upper half circular groove 4 and lower half round recessed 6 are spelled
Fixation is connect, the base angle a of ratcheting seam 5 and horizontal base 13 when splicing upper half circular groove 4 and lower half round recessed 61,
50°≤a1≤70°；
4) shear for the first time：Be further applied load by very heavy pressure end 1 to ground cylinder sample, until ground cylinder sample just by
Cut up, write down pressure value F at this time1, at this time
Direct stress
Shear stress
Wherein, d is ground cylinder sample diameter, and l is ground cylinder sample height；
Rock sample force diagram is as shown in Figure 5；
5) second of dress sample：The ground cylinder sample cut up in dress sample groove 7 is removed, loads another into dress sample groove 7
With the ground cylinder sample that step 3 uses with a batch of ground cylinder sample, then adjust upper half circular groove 4 and lower half round recessed 6
Position, splices fixation by upper half circular groove 4 and lower half round recessed 6, when making upper half circular groove 4 and the splicing of lower half round recessed 6
The base angle a of ratcheting seam 5 and horizontal base 132, 50 °≤a2≤ 70 °, a1≠a2；
6) shear for second：Be further applied load by very heavy pressure end 1 to ground cylinder sample, until ground cylinder sample just by
Cut up, write down pressure value F at this time2, at this time
Direct stress
Shear stress
Wherein, d is ground cylinder sample diameter, and l is ground cylinder sample height；
Rock sample force diagram is as shown in Figure 6；
7) analysis and arrangement obtained experimental data, according to the shear strength formula of Coulomb's lawPass through
Column calculates, and the amendment data of gained in step 2 are substituted into following formula, obtains the shearing strength cohesive force c of the rock sample
And internal friction angle
Wherein, d is ground cylinder sample diameter, and l is ground cylinder sample height；
Δσ0And Δ τ0Angle a=a during for without rock sample1When, the correction value that is calculated by step 2；
Δσ0' and Δ τ0' for without rock sample when angle a=a2When, the correction value that is calculated by step 2；
Obtain the Shear Strength Index of ground cylinder sample.
In step 2), calculate corresponding amendment direct stress △ σ and amendment when angle a is 50 °, 55 °, 60 °, 65 ° and 70 ° and cut
The value of stress △ τ, result of calculation are as shown in table 1 below：
The maxium load value that table 1 can add when being loaded without rock sample
If only calculating above-mentioned five groups of correction values, a in step 3) and step 5)1And a2The selection of angle also need to be upper
State and selected in 50 °, 55 °, 60 °, 65 ° and 70 °, and a1≠a2。
In step 4) and step 6), when being further applied load by very heavy pressure end 1 to ground cylinder sample, very heavy pressure end 1 with
The speed of 0.02KN/s is downwardly applied to load, until rock sample is just cut up.
In step 5), second muck sample does not use new rock sample, and uses the rock sample cut off for the first time passing through glue
Rock sample after bonding.
Claims (6)
- A kind of 1. side using the device measure ground cylinder sample Shear Strength Index for measuring ground cylinder sample Shear Strength Index Method, the device of the measure ground cylinder sample Shear Strength Index include horizontal base (13), the upper level of horizontal base (13) Multiple roller bearings (12) are provided with face；Ground cylinder sample shearing component is placed with multiple roller bearings (12)；In ground cylinder sample shearing component, the upper half circular groove (4) for being carved with angle dial (3) is solid by fastening bolt (14) Loaded on below pressure-bearing surface (2), pressure-bearing surface (2) is equipped with and the matched arrow of angle index, lower half round recessed (6) for Dingan County Splice and combine to form a cylinder with upper half circular groove (4), the middle part of cylinder forms the dress sample for placing ground cylinder sample Groove (7), dress sample groove (7) is interior to be placed with least one sample set (8), and sample set (8) is made of two semicircle bodies splicings, under The stitching portion of semicircle groove (6) and upper half circular groove (4) forms ratcheting seam (5)；Lower half round recessed (6) bottom is along the circumferential direction Multiple matched mounting holes of angle index (9) with upper half circular groove (4) are offered, shear box (10) passes through strap bolt Thin plate (11) and mounting hole (9) be fixed on lower half round recessed (6)；The shear box (10) of ground cylinder sample shearing component is placed on multiple roller bearings (12) of horizontal base (13)；Very heavy pressure end (1) is provided with pressure-bearing surface (2)；It is characterized in that this method comprises the following steps：1) ground cylinder sample is arranged；2) calculate when not placing ground cylinder sample, upper half circular groove (4) and lower half round recessed (6) when splicing ratcheting seam (5) and The base angle a of horizontal base (13), during 50 °≤a≤70 °, as angle a to be corresponded to during any value in above-mentioned number range Values of the amendment direct stress △ σ with correcting shear stress △ τ,Correct direct stress △ σ=Fcos a/dlCorrect shear stress △ τ=Fsin a/dlWherein, d is ground cylinder sample diameter, and l is ground cylinder sample height, and F is the pressure that jack is applied on ground cylinder sample Force value；Obtain above device and be not added with ground cylinder sample, the amendment Value Data of angle a pressure under different angle；3) sample is filled for the first time：Ground cylinder sample is put into sample set (8), by upper half circular groove (4) and lower half round recessed (6) Splicing is fixed, ratcheting seam (5) and the base of horizontal base (13) when splicing upper half circular groove (4) and lower half round recessed (6) Angle a1, 50 °≤a1≤70°；4) shear for the first time：It is further applied load by very heavy pressure end (1) to ground cylinder sample, until ground cylinder sample is just cut It is bad, write down pressure value F at this time1, at this timeDirect stressShear stressWherein, d is ground cylinder sample diameter, and l is ground cylinder sample height, F1When just being cut up for the first time for ground cylinder sample Pressure value；5) second of dress sample：The ground cylinder sample cut up in sample groove (7) will be filled and sample set (8) is removed, into dress sample groove (7) Load another sample set used with the ground cylinder sample that step 3) uses with a batch of ground cylinder sample and matched with devices (8), then upper half circular groove (4) and lower half round recessed (6) position are adjusted, by upper half circular groove (4) and lower half round recessed (6) Splicing is fixed, ratcheting seam (5) and the base of horizontal base (13) when splicing upper half circular groove (4) and lower half round recessed (6) Angle a2, 50 °≤a2≤ 70 °, a1≠a2；6) shear for second：It is further applied load by very heavy pressure end (1) to ground cylinder sample, until ground cylinder sample is just cut It is bad, write down pressure value F at this time2, at this timeDirect stressShear stressWherein, d is ground cylinder sample diameter, and l is ground cylinder sample height, F2When just being cut up for the second time for ground cylinder sample Pressure value；7) analysis and arrangement obtained experimental data, according to the shear strength formula of Coulomb's lawPass through column meter Calculate, and the amendment data of gained in step 2) are substituted into following formula, obtain the shearing strength cohesive force c of the ground cylinder sample And internal friction angleNumerical valueWherein, d is ground cylinder sample diameter, and l is ground cylinder sample height；Δσ0And Δ τ0Angle a=a during for without ground cylinder sample1When, the correction value that is calculated by step 2)；AndAngle a=a during for without ground cylinder sample2When, the correction value that is calculated by step 2)；Obtain the Shear Strength Index of ground cylinder sample.
- 2. according to the method described in claim 1, it is characterized in that：The quantity of sample set (8) is multiple, and pivot bush unit is in dress sample In groove (7).
- 3. according to the method described in claim 1, it is characterized in that：The left end of horizontal base (13) and the left end of shear box (10) Concordantly, the outer ring of the right end of horizontal base (13) and lower half round recessed (6) is on same vertical plane.
- 4. according to the method described in claim 1, it is characterized in that：In step 2), it is 50 °, 55 °, 60 °, 65 ° to calculate angle a And values of the corresponding amendment direct stress △ σ with correcting shear stress △ τ at 70 °.
- 5. according to the method described in claim 1, it is characterized in that：It is right by very heavy pressure end (1) in step 4) and step 6) When ground cylinder sample is further applied load, very heavy pressure end (1) is downwardly applied to load with the speed of 0.02KN/s, until ground cylinder sample Just cut up.
- 6. according to the method described in claim 4, it is characterized in that：In step 5), second muck soil cylinder sample does not use New ground cylinder sample, and use and the ground cylinder sample cut off for the first time is passed through into the ground cylinder sample after glue bond.
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| CN201610002367.6A CN105527172B (en) | 2016-01-01 | 2016-01-01 | A kind of device and assay method for measuring ground cylinder sample Shear Strength Index |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105606462A (en) * | 2016-01-01 | 2016-05-25 | 三峡大学 | Device and method for measuring rock sample shear strength indexes at different schistosity angles |
| CN106950122A (en) * | 2017-04-28 | 2017-07-14 | 四川理工学院 | A kind of device and assay method for determining ground cylinder sample Shear Strength Index |
| CN107966373A (en) * | 2017-11-13 | 2018-04-27 | 西安建筑科技大学 | Masonry cuts pressure device and masonry cuts pressure combined strength bination test method |
| CN108827698B (en) * | 2018-08-24 | 2024-07-09 | 天津市水务规划勘测设计有限公司 | A rock soil sample sampling device for geotechnical engineering reconnaissance |
| CN111141621B (en) * | 2020-01-17 | 2022-09-16 | 三峡大学 | Experimental device for measuring rock shear strength of single rock sample and using method |
| CN113702176A (en) * | 2021-07-15 | 2021-11-26 | 深圳大学 | Bidirectional electromagnetic loading dynamic compression-shear experimental device and test method |
| CN113702195A (en) * | 2021-07-15 | 2021-11-26 | 深圳大学 | Dynamic and static combined bidirectional electromagnetic loading compression shear experimental device and test method |
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