CN204903300U - Testing arrangement is cuted in drilling of soil body normal position - Google Patents
Testing arrangement is cuted in drilling of soil body normal position Download PDFInfo
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- CN204903300U CN204903300U CN201520597601.5U CN201520597601U CN204903300U CN 204903300 U CN204903300 U CN 204903300U CN 201520597601 U CN201520597601 U CN 201520597601U CN 204903300 U CN204903300 U CN 204903300U
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Abstract
The utility model discloses a testing arrangement is cuted in drilling of soil body normal position, mainly by operation platform 100, vertical pulling force mechanism 200, shear probe 300, supporting hydro -cylinder and add compression pump 400 and form, adopt the utility model discloses device drilling shear test can be at normal position quickly determine soil body cohesive strength and internal friction angle, and simpler and accurate with the data that drilling shear test obtained for indoor experiment, and the device is portable good: the collection of test operation and data just can be accomplished alone to the simple structure, can be fast determines whether to continue the multiunit according to field test's result and tests, and is stronger to the little suitability of disturbancly of soil than indoor triaxial test and direct shear test, can directly utilize fetching earth of geological survey stage at engineering initial stage to hole and test not repeated drilling, not resource -wasting.
Description
Technical field
The utility model relates to ground performance testing device, and especially one measures fine grained sand in position, the device of the shear strength parameter of clay and the silt soil body.
Background technology
In Geotechnical Engineering, soil classifiction index cohesive strength and angle of internal friction are important mechanical properties, are the important parameters of engineering calculation.What usual mensuration soil strength adopted is indoor shear test and Situ Computation.Indoor shear test comprises triaxial tests and direct shear test, even several days time tested to need several hours, and pass through on-site sampling, sample production etc. process, very large to soil disturbance, drainage condition is also difficult to control, and above-mentioned factor all can cause test result and actual result to come in and go out very large.Situ Computation carries out at soil in-situ, and the soil body keeps natural moisture content and natural strain condition, makes test findings true and reliable.But the cycle of conventional in situ shear test is long, human and material resources, temporally expend comparatively large, need in process of the test lifting jack and counterforce device are installed, by site condition restriction obviously, before engineering construction project is carried out, implement difficulty larger.
In view of the limitation of existing indoor and in-situ test method, Geotechnical Engineering circle finding always quick, simple and easy, determine the soil body more reliably, especially to soft, in, the in-situ testing method of the shear strength parameter of pan soil body.Widely used rock-boring shear test apparatus can detect soft rock fast in test site and cannot get the shear resistance of core rock at home at present, there is the advantage that simple to operate and measuring accuracy is high, but the soil body of rock is far smaller than for intensity and inapplicable.Domestic and international existing boring soil body shear test apparatus structure is too complicated; definitely smooth and test apparatus and the hole axes normal in experiment face near hole can not be ensured after boring; and because boring reason often can cause hole to cave in, causing cannot normal mounting proving installation.
Utility model content
In view of the above existing program of statement or the deficiency of correlation technique, the purpose of this utility model is to provide a kind of soil in-situ boring shear test apparatus, can determine the shear strength parameter of the engineering site soil body quickly and easily in Geotechnical Engineering construction.And for soft, in, pan soil body is all applicable.
To achieve these goals, technical solution of the present utility model is:
A kind of soil in-situ boring shear test apparatus, it is primarily of operating platform 100, vertical tension mechanism 200, shear Probe 300, supporting oil cylinder and add compression pump 400 and form; Operating platform 100 is a platform with four foot supports; Vertical tension mechanism 200 is bearing on operating platform 100 by a pair supporting oil cylinder (520 and 530); One end of pull bar 600 is connected with the clutch end of vertical tension mechanism 200, and its other end hangs shear Probe 300 by flexible chaining 610, and vertical tension mechanism 200 provides power for the vertical motion of pull bar 600; Shear Probe 300 has two pieces of circular saw shear plates: i.e. the first circular saw shear plate 310 and the second circular saw shear plate 320, cylinder and the first circular saw shear plate 310 of bidirectional piston cylinder 330 connect firmly, and the piston 332 of bidirectional piston cylinder 330 and the second circular saw shear plate 320 connect firmly; The left cylinder 333 of bidirectional piston cylinder 330 and right cylinder 334 respectively by gas circuit with add compression pump 400 gas circuit and be connected; Operating platform 100 is provided with the tensimeter 510 of reaction supporting oil cylinder oil pressure; Add the rain glass 410 that compression pump 400 gas circuit is provided with reaction airline pressure.
Adopt structure as above, vertical tension mechanism drives pull bar to move at vertical direction, and the reacting force (this reacting force is equal with soil sample shearing force numerical value) acting on supporting oil cylinder that motion produces is presented on dynamometer with the ratio (this ratio and shear stress) of shear area.Circular saw shear plate external margin arranges two row's shearing tooths, and when applying normal stress, shearing tooth is embedded in the hole wall soil body increases interlocking, and the shear surface useful area of shear plate is determined simultaneously, can determine shear stress in conjunction with shearing strength.Described pressurizing tool can adopt the product of different size according to actual needs.
On different bore position, carry out the hole wall soil body shear test under different normal stress during test, and utilize the soil body shear failure test figure under different normal stress to draw damage curve, in order to determine soil strength.
During the experiment of the utility model device, boring shear test can determine soil body cohesive strength and angle of internal friction in position fast, and relative to shop experiment with the data that obtain of boring shear test are more simple and accurately, device good portability: simple structure, a people just can complete the collection of test operation and data, can determine whether continue to organize test according to the result of site test fast more, than indoor triaxial test and the little applicability of the perturbation of direct shear test to soil strong, can the boring of fetching earth of direct utilizing works initial stage geology investigation stage test, do not repeat boring, do not waste resource.
Accompanying drawing is described as follows:
Fig. 1 is a kind of soil in-situ boring of the utility model shear test apparatus overall schematic.
Fig. 2 is the utility model shear Probe longitudinal sectional drawing.
Fig. 3 is the utility model shear Probe vertical view.
Fig. 4 is the utility model circular saw shear plate stereographic map.。
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage more clear, below in conjunction with accompanying drawing, the utility model will be further described.Specific embodiment described herein only in order to explain the utility model, and is not used in restriction the utility model.
As Fig. 1-Fig. 4 can see that the utility model soil in-situ boring shear test apparatus is primarily of operating platform 100, vertical tension mechanism 200, shear Probe 300, supporting oil cylinder with add compression pump 400 and form; Operating platform 100 is a platform with four foot supports (120 is one of support); Vertical tension mechanism 200 is bearing on operating platform 100 by a pair supporting oil cylinder (520 and 530); One end of pull bar 600 is connected with the clutch end of vertical tension mechanism 200, its other end hangs shear Probe 300 by flexible chaining 610, vertical tension mechanism 200 provides power for the vertical motion of pull bar 600, and vertical tension mechanism 200 can adopt worm gear reducer mechanism, the hoisting mechanism of driven by motor; Also can adopt manual lifting mechanism, in Fig. 1,210 is force application rod when adopting man-operated mechanism.Flexible chaining 610 is suspended on a termination of pull bar 600, it hangs shear Probe 300, and it is vertical that the suspension of this flexibility makes shear Probe more easily keep with the earth's core, makes it be elevated along drill center line more exactly.Shear Probe 300 has two pieces of circular saw shear plates: i.e. the first circular saw shear plate 310 and the second circular saw shear plate 320, cylinder and the first circular saw shear plate 310 of bidirectional piston cylinder 330 connect firmly, and the piston 332 of bidirectional piston cylinder 330 and the second circular saw shear plate 320 connect firmly; The left cylinder 333 of bidirectional piston cylinder 330 and right cylinder 334 respectively by gas circuit with add compression pump 400 gas circuit and be connected, the trend of control piston so discriminably; Operating platform 100 is provided with the tensimeter 510 of reaction supporting oil cylinder oil pressure; Add the rain glass 410 that compression pump 400 gas circuit is provided with reaction airline pressure.
During actual enforcement, adjust four foot supports and make operating platform and hole axes normal.When test depth ratio is larger, sleeve pipe can be used to be in open state to make hole, be that hole top keeps stable simultaneously, fall damage does not occur.
After adjusting operating platform, extend be connected adding compression pump 400 gas circuit with the left cylinder 333 of bidirectional piston cylinder 330 and right cylinder 334, keep on-position with for subsequent use.The one end of being drawn by pull bar 600 is connected with the clutch end of vertical tension mechanism 200, and its other end hangs shear Probe 300 by flexible chaining 610.Then shear Probe 300 is slowly put into hole and arrive the degree of depth that will test, note not making circular saw shear plate contact with hole wall.
Shear Probe starts after arriving the test degree of depth, is carried out pneumatic compression by the left cylinder of pneumatic pump to piston-cylinder, and piston driving makes circular saw shear plate and hole wall contact completely and applies required pressure, and pressure process uses liquid carbon dioxide applying pressure also can.The soil contacted with circular saw shear plate needs time enough to carry out consolidation, and for first data point, clean sand needs 5 minutes, and silt needs 10 minutes, and most of clay needs 15 minutes.Such as clay, water discharge time is accumulative, and test point subsequently needs 5 minutes or 10 minutes to carry out consolidation usually.Whether consolidation time fully can be embodied in test point, if failure envelope flattens suddenly or curve declines suddenly, so needs to increase consolidation time to confirm whether the change of envelope is caused by pore water pressure in next test point.
After treating that consolidation completes, begin through vertical tension mechanism 200 and apply to form shear stress to upper pulling force.Apply to guarantee pull bar and hole axis being parallel all the time in shearing force process.Shake force application rod 210, vertical tension mechanism 200 is made to drive pull bar 600 to move at vertical direction, drive the force reaction of pull bar motion on supporting oil cylinder, this reacting force is equal with soil sample shearing force numerical value, because the ratio of power and circular saw shear surface useful area is for this reason shear stress values, the scale of tensimeter 510 is set to be expressed as the shear stress values be associated with institute measuring pressure, and shear stress values is directly presented on tensimeter 510.The lifting speed of vertical tension mechanism is determined according to drainage requirement, observes the reading of meter simultaneously, removes lax part of firm incipient stage, the reading of dynamometer can be stable increase, continue shake force application rod 210, until when dynamometer is recorded to greatest measure, soil sample reaches collapse state.Then force application rod 210 is oppositely shaken until dynamometer reading is zero.Proceed several groups of tests below after having recorded numerical value, increase normal stress, note the time, recorded normal stress and the maximum shear stress, at least repeat 4 to 5 tests, until be depicted as satisfied shearing envelope.
Tested the pressure in the left cylinder of rear unloading, opened right cylinder and be connected with pneumatic pump, piston left return drives circular saw shear plate to depart from ground, promotes shear Probe and shifts out hole.
The determination of shear surface useful area:
For the boring in 75mm aperture, circular saw shear plate is the arc surface of standard, radian is 60 °, shear plate diameter d=75mm, h=30mm, be arranged in order 10 row's shearing tooths from top to bottom, shearing tooth longitudinal profile is equilateral triangle, and useful area is shearing tooth surface ramp projection sum in the horizontal direction.
Calculating shear surface useful area can adopt following formula (1) to calculate:
In formula:
A---be shear surface useful area (mm
2);
D---be arc diameter (mm);
H---be shear surface height (mm);
Total effectively shear area is both sides shear surface area sum 2A.
Adopt basic scheme of the present utility model; when reality is implemented, multiple different equivalent processes and system can be derived, as long as be the technical scheme according to utility model and utility model design thereof; be equal to and replace and change, be all considered to belong to the protection domain of the claim of utility model.
Claims (5)
1. a soil in-situ boring shear test apparatus, it is characterized in that, primarily of operating platform (100), vertical tension mechanism (200), shear Probe (300), supporting oil cylinder and add compression pump (400) composition; Operating platform (100) is a platform with four foot supports; Vertical tension mechanism (200) is bearing on operating platform (100) by a pair supporting oil cylinder (520 and 530); One end of pull bar (600) is connected with the clutch end of vertical tension mechanism (200), its other end hangs shear Probe (300) by flexible chaining (610), and vertical tension mechanism (200) provides power for the vertical motion of pull bar (600); Shear Probe (300) has two pieces of circular saw shear plates: i.e. the first circular saw shear plate (310) and the second circular saw shear plate (320), cylinder and the first circular saw shear plate (310) of bidirectional piston cylinder (330) connect firmly, and piston (332) and the second circular saw shear plate (320) of bidirectional piston cylinder (330) connect firmly; The left cylinder (333) of bidirectional piston cylinder (330) and right cylinder (334) respectively by gas circuit with add compression pump (400) gas circuit and be connected; Operating platform (100) is provided with the tensimeter (510) of reaction supporting oil cylinder oil pressure; Add the rain glass (410) that compression pump (400) gas circuit is provided with reaction airline pressure.
2. soil in-situ according to claim 1 boring shear test apparatus, is characterized in that: the scale of described tensimeter (510) is set to be expressed as the shear stress values be associated with institute measuring pressure.
3. soil in-situ according to claim 1 boring shear test apparatus, is characterized in that: the scale of described rain glass (410) is set to be expressed as the normal stress value be associated with institute measuring pressure.
4. soil in-situ boring shear test apparatus according to claim 1, is characterized in that: described circular saw shear plate is standard round arc, and the diameter of circular arc is identical with the diameter of detection hole; Circular saw shear plate external margin arranges two row's shearing tooths.
5. soil in-situ boring shear test apparatus according to claim 1, it is characterized in that, described vertical tension mechanism (200) adopts: the worm gear reducer mechanism of driven by motor, hoisting mechanism; Also manual lifting mechanism can be adopted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520597601.5U CN204903300U (en) | 2015-08-07 | 2015-08-07 | Testing arrangement is cuted in drilling of soil body normal position |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520597601.5U CN204903300U (en) | 2015-08-07 | 2015-08-07 | Testing arrangement is cuted in drilling of soil body normal position |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105067435A (en) * | 2015-08-07 | 2015-11-18 | 西南交通大学 | Soil in-suit boring shearing testing device |
| CN109443908A (en) * | 2018-12-28 | 2019-03-08 | 机械工业勘察设计研究院有限公司 | A kind of indoor model test device and method of the shearing test that drills |
| CN110082211A (en) * | 2019-05-22 | 2019-08-02 | 江苏科技大学 | A kind of speed-limited liquidation soil intensity device for fast detecting and detection method |
| CN113686648A (en) * | 2021-07-15 | 2021-11-23 | 长沙理工大学 | In-situ shearing instrument |
-
2015
- 2015-08-07 CN CN201520597601.5U patent/CN204903300U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105067435A (en) * | 2015-08-07 | 2015-11-18 | 西南交通大学 | Soil in-suit boring shearing testing device |
| CN109443908A (en) * | 2018-12-28 | 2019-03-08 | 机械工业勘察设计研究院有限公司 | A kind of indoor model test device and method of the shearing test that drills |
| CN110082211A (en) * | 2019-05-22 | 2019-08-02 | 江苏科技大学 | A kind of speed-limited liquidation soil intensity device for fast detecting and detection method |
| CN110082211B (en) * | 2019-05-22 | 2024-01-19 | 江苏科技大学 | Speed-limiting type quick detection device and detection method for strength of fluidized soil |
| CN113686648A (en) * | 2021-07-15 | 2021-11-23 | 长沙理工大学 | In-situ shearing instrument |
| CN113686648B (en) * | 2021-07-15 | 2024-04-05 | 长沙理工大学 | In-situ shearing instrument |
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