CN101592575B - Airbag-loading potable weak and soft interlayer direct shear apparatus - Google Patents
Airbag-loading potable weak and soft interlayer direct shear apparatus Download PDFInfo
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- CN101592575B CN101592575B CN2009100851760A CN200910085176A CN101592575B CN 101592575 B CN101592575 B CN 101592575B CN 2009100851760 A CN2009100851760 A CN 2009100851760A CN 200910085176 A CN200910085176 A CN 200910085176A CN 101592575 B CN101592575 B CN 101592575B
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- 239000011229 interlayers Substances 0.000 title claims abstract description 9
- 238000006073 displacement reactions Methods 0.000 claims abstract description 17
- 238000006243 chemical reactions Methods 0.000 claims abstract description 9
- 239000003570 air Substances 0.000 claims description 16
- 238000007906 compression Methods 0.000 claims description 13
- 240000006028 Sambucus nigra Species 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010410 layers Substances 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 239000011521 glasses Substances 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 5
- 239000004575 stone Substances 0.000 claims description 3
- 238000010008 shearing Methods 0.000 abstract description 5
- 239000002689 soil Substances 0.000 description 14
- 239000004927 clay Substances 0.000 description 3
- 229910052570 clay Inorganic materials 0.000 description 3
- 238000005516 engineering processes Methods 0.000 description 2
- 230000000875 corresponding Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000002474 experimental methods Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000034 methods Methods 0.000 description 1
- 230000003014 reinforcing Effects 0.000 description 1
Abstract
Description
Technical field soil mechanics experimental technique field
The background technology weak intercalated layer belongs to the soil body, and existing soil mechanics shear test is divided into shop experiment and in-situ test.Indoor shear test mainly contains two kinds: direct shear test and triaxial compression test.Direct shear test uses counterweight that soil sample is applied normal pressure by lever, applies horizontal thrust then, and sample is destroyed along predetermined shear surface.Calculate acquisition sample shear strength parameter C, φ value by many groups direct shear test.For weak intercalated layer, the advantage of direct shear test is that test operation is easy, and sample size is few, and is consuming time few; Shortcoming is the easy disturbance of weak intercalated layer, and the instrument heaviness can not be tested at the scene.
Triaxial compression test is that sample is applied confined pressure, applies xial feed then, destroys until soil sample.Carry out many group tests back calculate obtain sample shear strength parameter C, Value.The triaxial compression test advantage is the parameters of shear resistant that can obtain under the sample true stress state, and shortcoming is that instrument is accurate complicated, and sample size is big, and length consuming time can not be tested at the scene.Two kinds of shop experiments have common shortcoming to be: the original state sample is difficult for obtaining, and disturbance easily takes place in packed and transported sample; Can not test at the scene, obtain test findings fast.
The original position shear test mainly contains two kinds: vane shear test and the large-scale pushing and cutting experiment of the on-the-spot soil body.Vane shear test is compressed into clay with rectangle four-bladed vane or chamfering four-bladed vane and is rotated, and calculates the undrained shear strength τ of complete saturated clay f, but can not measure soil body cohesive strength C, angle of friction Value.The large-scale pushing and cutting experiment of the on-the-spot soil body does not have the equipment of fixed standard, generally uses hydraulic pump, lifting jack, plank, steel plate, reaction frame, the reaction beam etc. of testing pits.This method can draw soil body cohesive strength C, angle of friction Value, but shortcoming is funds, time and manually expends morely that equipment heaviness, operability are not strong.
In a word, four kinds of methods of present two class soil mechanics shear tests, preceding two kinds of shop experiment method samples are subjected to disturbance easily in packed and transported, be difficult for carrying out the test of original state sample; And can not test quick acquisition test findings at the scene.The two kinds of in-situ tests in back, a kind of undrained shear strength that can only test saturated soft clay, a kind of testing apparatus heaviness wastes time and energy, and operability is relatively poor.Existing soil mechanics shearing test method all can not satisfy the requirement that weak intercalated layer obtains the undisturbed soil sample shear parameters quickly and easily.
Summary of the invention the invention provides a kind of easy and accurate on-the-spot airbag-loading potable weak and soft interlayer direct shear apparatus.Adopt air bag to load and apply normal force, place the piston system on reaction frame top can when sample generation shear displacemant, guarantee the vertical of normal force, and normal force applies evenly; Adopt ball screw system to apply tangential force, the line slideway under sample holder can guarantee that shearing force applies the direction level, and tangential force is steady continuously.The normal direction afterburner system need not loading, and the portable heating pressure device is adopted in the air bag pressurization, and precision is high and simple and easy to do.The tangential stress application system is with the reinforcing of leading screw handle, and is steadily afterburning, strong operability.Normal direction afterburner system and tangential stress application system are fixed, and the little reliability height of volume is convenient to site test.This test unit can carry out cutting soon of on-the-spot weak intercalated layer, and discharging consolidation is cut and slow shear test soon, and easy accurate, strong operability.
Airbag-loading potable weak and soft interlayer direct shear apparatus, it is made up of following several parts: weak intercalated layer sample device part, by locating cone 12, steel pressure pad 13, last box 14, following box 15, fixed pin 16, sample holder 17, permeable stone 23, osculum 30 and sample 22 are formed, and at first sample 22 are placed box 14 and following box 15 during test; Gasbag-type normal direction compression system, by inflation pressurizing valve 5, air bag 6, piston 7, piston wall 8, limited bolt 9, force-transmitting pole 10 and pilot hole 11 are formed; Normal direction pressurization reaction frame system, by rigid posts 1, entablature 2, lower bottom base 3 and leg 4 are formed; The tangential compression system of ball-screw, by sample holder 17, line slideway 18, rigidity transmission rod 19, gearing 20 and leading screw handle 21 are formed; Power and displacement measurement system, by pressure transducer 24, horizontal displacement sensors 25, fixed block 26, steel wire 27, perpendicular displacement sensor 28 and rain glass 29 are formed.
Ultimate principle and technology: according to soil mechanics shear test principle, the sample normal pressure must be constant and vertical all the time, and tangential force is steady continuously and will keep level.Adopt gasbag-type normal direction compression system and the tangential compression system of ball-screw can guarantee above requirement.
Gasbag-type normal direction compression system places piston 7 with air bag 6, and 6 pressurizations of 5 pairs of air bags of inflation pressurizing valve by force-transmitting pole 10 and steel pressure pad 13, sample 22 is applied the normal direction load, and the load direction are always vertical; Rigid posts 1, entablature 2 and lower bottom base 3 are formed the reaction frame system, guarantee applying of normal direction pressurization; Piston 7 internal diameters are designed to 123.6mm, and sample 22 internal diameters are 61.8mm, and air bag maximum load air pressure is 0.3MPa, and the maximum normal stress that passes on the sample is 1.2MPa, satisfy the demand of soil body direct shear test to normal stress.Air bag loads by piston 7 and guarantees the vertical of normal force, and weak intercalated layer is being sheared box tangential movement at present, and last box is fixed, and normal force is constant and vertical always in the shear history.
The tangential compression system of ball-screw, apply tangential force by ball-screw, sample holder 17 places on the line slideway 18, and lead screw gear 20 links to each other with sample holder 17 by rigidity transmission rod 19, rotational lead screw handle 21 can apply horizontal force, and line slideway 18 can guarantee the continuous and direction of horizontal force.
Normal force can take advantage of 4 to get final product by air bag rain glass 29 readings, and consolidation settlement is read by perpendicular displacement sensing 28, and tangential force is read by pressure transducer 24, and horizontal shift is read by horizontal displacement sensors 25.
Description of drawings
Fig. 1: airbag-loading potable weak and soft interlayer direct shear apparatus sectional view
Fig. 2: airbag-loading potable weak and soft interlayer direct shear apparatus A-A sectional view
1: rigid posts; 2: entablature; 3: lower bottom base; 4: leg; 5: the inflation pressurizing valve; 6: air bag; 7: piston; 8: piston wall; 9: limited bolt; 10: force-transmitting pole; 11: pilot hole; 12: locating cone; 13: the steel pressure pad; 14: go up box; 15: following box; 16: fixed pin; 17: sample holder; 18: line slideway; 19: the rigidity transmission rod; 20: gearing; 21: the leading screw handle; 22: sample; 23: permeable stone; 24: pressure transducer; 25: horizontal displacement sensors; 26: fixed block; 27: steel wire; 28: the perpendicular displacement sensor; 29: rain glass; 30: osculum
After embodiment 1. samples 22 installed, usage level chi leveling instrument lower bottom base 3 used the portable aerating tube that air bag 6 is pressurizeed, and arrives predetermined pressure up to rain glass 29.
2. according to concrete testing requirements, rotating threaded shaft handle 21 makes specimen mount 17 along line slideway 18 tangential movements, the rotating threaded shaft handle 21 gradually, apply increasing tangential stress and read corresponding displacement, constant or when descending until pressure transducer 24 readings, show that sample 22 is cut off.Write down pressure transducer 24 readings, the shift value of reading horizontal displacement transducer 25.Pressure transducer 24 maximal values are pressure and the line slideway 18 friction force sums of sample 22 when cutting off, and utilize line slideway 18 friction factor that record in advance, can calculate friction force, thereby calculate shear stress.
3. cut off back reverse rotation leading screw handle 21, sample 22 is resetted, removal normal direction load, and sample 22 placed original position, the former normal direction load of resetting carries out the residual strength test.
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100851760A CN101592575B (en) | 2009-05-27 | 2009-05-27 | Airbag-loading potable weak and soft interlayer direct shear apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100851760A CN101592575B (en) | 2009-05-27 | 2009-05-27 | Airbag-loading potable weak and soft interlayer direct shear apparatus |
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| Publication Number | Publication Date |
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| CN101592575A CN101592575A (en) | 2009-12-02 |
| CN101592575B true CN101592575B (en) | 2011-01-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2009100851760A CN101592575B (en) | 2009-05-27 | 2009-05-27 | Airbag-loading potable weak and soft interlayer direct shear apparatus |
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| CN103364241B (en) * | 2013-07-06 | 2016-01-20 | 安徽省（水利部淮河水利委员会）水利科学研究院 | Reinvent fine grained soil sample preparation device |
| CN103499491B (en) * | 2013-09-24 | 2016-01-20 | 东北大学 | A kind of Multi-axial Loading system and loading method |
| CN103728178B (en) * | 2014-01-01 | 2016-04-13 | 浙江建设职业技术学院 | A kind of inflatable of post loads locating device and loads localization method |
| CN105716889A (en) * | 2014-12-03 | 2016-06-29 | 中国飞机强度研究所 | Air bag loading test method |
| CN104458445B (en) * | 2014-12-08 | 2017-05-10 | 河南城建学院 | Shear test device and shear test method in in-situ soil body pore |
| CN104614231B (en) * | 2015-02-12 | 2017-09-15 | 南京工业大学 | A kind of laminar shear model clay case that can be loaded |
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| CN108918286B (en) * | 2018-09-12 | 2020-09-08 | 三峡大学 | Space-simulating multi-angle normal stress reaction frame device and using method |
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| CN111089781A (en) * | 2020-01-16 | 2020-05-01 | 中国科学院武汉岩土力学研究所 | Rock shear test equipment and direct shear test method for rock test block |
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| CN101592575A (en) | 2009-12-02 |
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