CN102252917A - Midsize direct shear apparatus with non-lever type loading - Google Patents
Midsize direct shear apparatus with non-lever type loading Download PDFInfo
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- CN102252917A CN102252917A CN 201110153352 CN201110153352A CN102252917A CN 102252917 A CN102252917 A CN 102252917A CN 201110153352 CN201110153352 CN 201110153352 CN 201110153352 A CN201110153352 A CN 201110153352A CN 102252917 A CN102252917 A CN 102252917A
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- 239000005341 toughened glass Substances 0.000 claims abstract description 4
- 238000012545 processing Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 2
- 238000012360 testing method Methods 0.000 abstract description 14
- 238000006073 displacement reaction Methods 0.000 abstract description 11
- 238000000034 method Methods 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 7
- 238000010008 shearing Methods 0.000 abstract description 5
- 239000002689 soil Substances 0.000 abstract description 5
- 238000011161 development Methods 0.000 abstract description 4
- 239000011435 rock Substances 0.000 abstract description 4
- 230000009977 dual effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000010429 evolutionary process Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a midsize direct shear apparatus with non-lever type loading, comprising dual rails, a base, a lower shear box, an upper shear box, a pressure transferring plate, a horizontal loading device and a vertical loading device mounted on a beam, wherein the horizontal and vertical loading devices are respectively realized by the way of a stepping motor and a lead screw. Both the load applied to the vertical direction and the load applied to the horizontal direction are measured by a load sensor. The vertical displacement and the horizontal displacement are measured and further controlled by a grating ruler displacement sensor fixed on the lead screw. The shearing area reducing value can be indirectly obtained through the measured value of the vertical displacement and the horizontal displacement, so as to control the loading force of the vertical loading device, that is to say the vertical normal stress can keep a dynamic constant. The direct shear test can more realistically reflect the actual shear strength characteristics of the rock and the soil. Due to the adoption of a transparent toughened glass mode and a matched digital camera, the development change process of the shear surface can be tracked and observed in a real-time manner.
Description
Technical field
The present invention relates to a kind of rubble, the soil body and soil-rock mixture shearing strength, the residual device of cutting intensity, especially strain control and non-lever of Stress Control formula tested and load novel medium-sized direct shear apparatus.The invention belongs to geotechnological experiment test technical field, relate to and utilize stepper motor to load, utilize control of grating chi and Displacement Measurement, realize the control of stress and strain formula, obtain the shearing strength of rubble, the soil body and soil-rock mixture, and utilize the digital picture measuring technique to write down and observe the development trend of shear zone.
The present invention relates to a kind of device, especially medium-sized direct shear apparatus of strain and stress control type of testing soil shear strength and stress, coping behavior.
Background technology
At present, direct shear test is the conventional art means of the shear strength parameter test of rock, soil etc.Yet because the scheme that traditional direct shear apparatus generally uses lever to load in vertical direction make that the process that loads is discontinuous, and the precision that loads is not high.On the other hand, traditional direct shear apparatus generally is made up of the upper and lower box of cutting, and one of them shear box is fixed (normally going up box), and another is movable.When using traditional direct shear apparatus test, in process of the test along with the development of shear displacemant, shear area reduces gradually, movable shear box departs from original position, and the position of vertical loading device does not change, and is applied to the center of the perpendicular stress on the shear box and the size of vertical loading power and does not also change, cause normal stress to increase gradually, no longer keep constant, deviated from the service condition of mole-enclosed pasture criterion of strength, make test findings produce distortion and error.When shear displacemant was bigger, in medium-sized and large-scale direct shear test, distortion that causes and error cannot be ignored.This also is the defective that traditional geotechnological direct shear apparatus exists.
The following staight scissors box of traditional in addition direct shear apparatus is installed in the groove that is processed with roller, roller is used for supporting down the staight scissors box, carrying out along with shear test, the discontinuity of each roller, and, the ground etc. of test usefulness easily from upper and lower staight scissors and between the slit in enter raceway and block roller, operation and maintenance is all inconvenient.
Summary of the invention
Progressively reduce in order to overcome existing direct shear apparatus its shear area of generation in process of the test along with shear displacemant, the deficiency that causes normal stress progressively to increase, technical matters to be solved by this invention along with reducing of shear area provide a kind of in process of the test vertical normal stress keep constant medium-sized direct shear apparatus.Secondly, in order to solve deficiency and the defective that traditional vertical direction lever loads, the invention provides a kind of vertical servo-type motor-driven loading scheme, in addition, when loading for the solution level, the problem on deformation of structure the invention provides a kind of tower structure scheme with diagonal brace.Successful solution level stability of structure problem when loading.In order to overcome the problem that roller supports the caused discontinuity of shear box, the invention provides a kind of evenly stressed bracing or strutting arrangement.
The technical solution adopted for the present invention to solve the technical problems is: a kind of medium-sized direct shear apparatus, comprise two-orbit, down cut box, on cut box, pressure transmission plate, roll support, horizontal charger and be installed on the vertical loading device on the flat board of being supported on four root posts.The load of described vertical loading device is measured by the load transducer that links to each other with charger, and moving then of vertical loading device measured by the grating rule displacement sensor that links to each other with the vertical loading device.The load of described horizontal charger is measured by the load transducer that links to each other with charger, and moving then of horizontal charger measured by the grating rule displacement sensor that links to each other with horizontal charger.The last staight scissors box of instrument maintains static, and can directly obtain the value that reduces of shear area by the displacement of the following staight scissors box of measuring, and the size in order to the loading force that feeds back to control system control vertical loading device can realize that the dynamic maintenance of vertical normal stress is constant.May cause the problem on deformation of structure when loading, be connected with vertical column, stablize firm triangular truss structure, effectively solve the problem that structure may be out of shape thereby formed by two diagonal braces for the solution level.In order to solve the problem of roller supporting device unbalance stress in shear history, adopted the supported design scheme of two guide rails, effectively solved inhomogeneous stressed problem.
Traditional upright lever formula loading accuracy is not enough realizes the shortcoming of control automatically with being difficult in order to solve, and the mode that the vertical loading device adopts stepper motor to drive leading screw realizes the loading of vertical direction.
In addition,, adopted simultaneously, be furnished with digital camera, can write down the generation and the evolutionary process of shear zone in the shear history to the staight scissors box of tempered glass moulding for generation and the evolution process of observing shear zone.
Description of drawings
Fig. 1 is a control principle block scheme of the present invention.
Fig. 2 is the front view of the medium-sized direct shear apparatus of invention.
Fig. 3 is the vertical view of the medium-sized direct shear apparatus of invention.
Fig. 4 is the left view of the medium-sized direct shear apparatus of invention.
Embodiment:
The present invention is further described below in conjunction with drawings and Examples.
As Fig. 1, Fig. 2, shown in Figure 3, medium-sized direct shear apparatus of the present invention comprises, base plate 1, two-orbit 2, cuts box 4, load plate 9, horizontal charger 7 and vertical loading device 14 down, and the vertical loading device supports 11, last staight scissors box stationary installation 8.By the grating chi 15 that is installed on the horizontal charger, measure the displacement of down cut box, calculate the value that reduces of shear area, the size in order to control vertical loading device loading force realizes the dynamically constant of direction stress.
The displacement signal that described optical grating ruler measurement arrives is delivered to the control circuit of vertical loading device 7 by signal Processing and after amplifying circuit amplifies, the size of control vertical loading load that device adds.The vertical loading device is stepper motor and leading screw or other mechanical hook-ups.
Medium-sized direct shear apparatus of the present invention, horizontal charger also is made up of stepper motor and leading screw, and horizontal charger is applied on the down cut box.
Medium-sized direct shear apparatus of the present invention is provided with two tracks, and the down cut box is placed on two tracks, and track plays the motion of support down cut box and the effect of guide-localization, and normal stress is evenly distributed on the down cut box.
The shear box of medium-sized direct shear apparatus of the present invention has simultaneously adopted the scheme that designs and produces of tempered glass, is furnished with digital camera and image processing system in addition, can write down and analyze in the direct shear test process, the generation of shear zone and development trend.
Medium-sized direct shear apparatus of the present invention system, its vertical and level to force structure partly be different from traditional direct shear apparatus, form by four root posts and two diagonal braces, the column upper end is linked together by steel plate, making becomes a firm stress frame, and steel plate also provides vertical loading Unit Installation platform in addition.The effect of two diagonal braces provides the reaction device of level to shearing force, makes that column is unlikely to produce distortion in level under the effect of shearing.
Medium-sized direct shear apparatus of the present invention system, the stationary installation of last shear box is different from the fixed form of traditional staight scissors box, adopt be installed in that self-oiling bearing on the column links together about two blocks of side plates, floor is arranged to strengthen the intensity of side plate on the side plate, have screw hole on the side plate, fix the left and right sides of shear box with bolt by screw hole.
Claims (1)
1. a non-lever loads medium-sized direct shear apparatus, comprise base plate (1), two-orbit (2), down cut box (4), on cut box (5), horizontal charger (7), load pressure transmission plate (9), vertical loading device (14), signal processing mechanism, it is characterized in that: vertical loading device (14), horizontal charger (7) are stepper motor and drive leading screw, and signal processing mechanism is connected with stepper motor (16); The staight scissors box all has one side to be tempered glass up and down; Last staight scissors box is fixing by the lateral fixation device (8) that is installed on the column (17); Following staight scissors box (3) is installed on the slip two-orbit (2), and slides along two-orbit (2); The motor of top charger is installed on the flat board that is fixed on four root posts (17), and two diagonal braces (12) and column are connected to form firm load carrier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110153352 CN102252917A (en) | 2011-06-08 | 2011-06-08 | Midsize direct shear apparatus with non-lever type loading |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110153352 CN102252917A (en) | 2011-06-08 | 2011-06-08 | Midsize direct shear apparatus with non-lever type loading |
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| CN102252917A true CN102252917A (en) | 2011-11-23 |
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| CN 201110153352 Pending CN102252917A (en) | 2011-06-08 | 2011-06-08 | Midsize direct shear apparatus with non-lever type loading |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102621008A (en) * | 2012-03-13 | 2012-08-01 | 中交水运规划设计院有限公司 | Fully automatic strain control type direct shear test instrument and purpose thereof |
| CN102680328A (en) * | 2011-12-07 | 2012-09-19 | 长安大学 | Electrical large strain control type ring shearing apparatus |
| CN103278770A (en) * | 2013-04-26 | 2013-09-04 | 福建工程学院 | Ultrasonic motor performance comprehensive testing device and testing method thereof |
| CN103852371A (en) * | 2014-03-12 | 2014-06-11 | 中国水电顾问集团贵阳勘测设计研究院有限公司 | Visual shearing and sample loading box applicable to direct shear test of coarse-grained soil |
| CN104596848A (en) * | 2015-01-16 | 2015-05-06 | 南京航空航天大学 | Load test device |
| CN104931361A (en) * | 2015-06-26 | 2015-09-23 | 青岛理工大学 | Pile-soil interface shear simulation test method for open concrete pipe pile |
| CN106442171A (en) * | 2016-11-04 | 2017-02-22 | 中国有色金属工业昆明勘察设计研究院 | Horizontal type diagonal supporting device for vertical loading of large in-situ shear test |
| CN108225944A (en) * | 2018-01-22 | 2018-06-29 | 西南交通大学 | A kind of rubble railway ballast direct shear test instrument |
| CN109781620A (en) * | 2019-03-29 | 2019-05-21 | 长安大学 | A kind of pitch cohesive strength measuring method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6003382A (en) * | 1997-06-25 | 1999-12-21 | The Penn State Research Foundation | Computer control shear cell tester |
| CN1529144A (en) * | 2003-10-16 | 2004-09-15 | 四川大学 | Coarse soil direct shear instrument |
| CN2653485Y (en) * | 2003-10-16 | 2004-11-03 | 徐进 | Coarse soil direct shear instrument |
| CN101592575A (en) * | 2009-05-27 | 2009-12-02 | 中国科学院地质与地球物理研究所 | Airbag-loading potable weak and soft interlayer direct shear apparatus |
| CN201438167U (en) * | 2009-07-20 | 2010-04-14 | 长安大学 | Portable direct shear apparatus |
| CN201788615U (en) * | 2010-09-10 | 2011-04-06 | 长沙理工大学 | Demonstration instrument for stress and deformation process of soil sample in direct shear test |
| CN201817804U (en) * | 2010-10-21 | 2011-05-04 | 重庆大学 | On-site undisturbed soil direct shear tester |
-
2011
- 2011-06-08 CN CN 201110153352 patent/CN102252917A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6003382A (en) * | 1997-06-25 | 1999-12-21 | The Penn State Research Foundation | Computer control shear cell tester |
| CN1529144A (en) * | 2003-10-16 | 2004-09-15 | 四川大学 | Coarse soil direct shear instrument |
| CN2653485Y (en) * | 2003-10-16 | 2004-11-03 | 徐进 | Coarse soil direct shear instrument |
| CN101592575A (en) * | 2009-05-27 | 2009-12-02 | 中国科学院地质与地球物理研究所 | Airbag-loading potable weak and soft interlayer direct shear apparatus |
| CN201438167U (en) * | 2009-07-20 | 2010-04-14 | 长安大学 | Portable direct shear apparatus |
| CN201788615U (en) * | 2010-09-10 | 2011-04-06 | 长沙理工大学 | Demonstration instrument for stress and deformation process of soil sample in direct shear test |
| CN201817804U (en) * | 2010-10-21 | 2011-05-04 | 重庆大学 | On-site undisturbed soil direct shear tester |
Non-Patent Citations (1)
| Title |
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| 《岩土力学》 20101130 刘小丽等 一种直剪式模型试验设备的设计及应用 475-480 1 第31卷, * |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102680328A (en) * | 2011-12-07 | 2012-09-19 | 长安大学 | Electrical large strain control type ring shearing apparatus |
| CN102680328B (en) * | 2011-12-07 | 2013-10-23 | 长安大学 | Electrical large strain control type ring shearing apparatus |
| CN102621008A (en) * | 2012-03-13 | 2012-08-01 | 中交水运规划设计院有限公司 | Fully automatic strain control type direct shear test instrument and purpose thereof |
| CN102621008B (en) * | 2012-03-13 | 2014-08-20 | 中交水运规划设计院有限公司 | Fully automatic strain control type direct shear test instrument and purpose thereof |
| CN103278770B (en) * | 2013-04-26 | 2015-07-29 | 福建工程学院 | The performance comprehensive test device of ultrasound electric machine and method of testing thereof |
| CN103278770A (en) * | 2013-04-26 | 2013-09-04 | 福建工程学院 | Ultrasonic motor performance comprehensive testing device and testing method thereof |
| CN103852371B (en) * | 2014-03-12 | 2016-08-17 | 中国水电顾问集团贵阳勘测设计研究院有限公司 | Dress sample box is sheared in a kind of coarse-grained soil direct shear test visualization |
| CN103852371A (en) * | 2014-03-12 | 2014-06-11 | 中国水电顾问集团贵阳勘测设计研究院有限公司 | Visual shearing and sample loading box applicable to direct shear test of coarse-grained soil |
| CN104596848A (en) * | 2015-01-16 | 2015-05-06 | 南京航空航天大学 | Load test device |
| CN104596848B (en) * | 2015-01-16 | 2017-04-19 | 南京航空航天大学 | Load test device |
| CN104931361A (en) * | 2015-06-26 | 2015-09-23 | 青岛理工大学 | Pile-soil interface shear simulation test method for open concrete pipe pile |
| CN104931361B (en) * | 2015-06-26 | 2017-08-11 | 青岛理工大学 | Pile-soil interface shear simulation test method for open concrete pipe pile |
| CN106442171A (en) * | 2016-11-04 | 2017-02-22 | 中国有色金属工业昆明勘察设计研究院 | Horizontal type diagonal supporting device for vertical loading of large in-situ shear test |
| CN108225944A (en) * | 2018-01-22 | 2018-06-29 | 西南交通大学 | A kind of rubble railway ballast direct shear test instrument |
| CN109781620A (en) * | 2019-03-29 | 2019-05-21 | 长安大学 | A kind of pitch cohesive strength measuring method |
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Application publication date: 20111123 |