CN204964309U - A test device that is used for refined calculation to freeze clay poisson's ratio - Google Patents
A test device that is used for refined calculation to freeze clay poisson's ratio Download PDFInfo
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- CN204964309U CN204964309U CN201520762075.3U CN201520762075U CN204964309U CN 204964309 U CN204964309 U CN 204964309U CN 201520762075 U CN201520762075 U CN 201520762075U CN 204964309 U CN204964309 U CN 204964309U
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- brace table
- clay
- photomodulator
- photodetector
- fixed head
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Abstract
The utility model relates to a test device that is used for refined calculation to freeze clay poisson's ratio, comprising a base plate, the laser instrument, light modulator, optical detector, signal processor and optic fibre, light modulator, be equipped with the brace table between the optical detector, the left part of brace table, the right part symmetry is equipped with the direction spout, equal sliding fit has slider in the direction spout, the upper portion of brace table is equipped with the cavity column structure, there is the double threaded screw through bearing horizontal installation in the cavity column structure, the left part of double threaded screw, the right part respectively with the slider screw -thread fit that corresponds, be equipped with two displacement meters directly over the brace table. Detection device is all installed on slider's upper portion. The utility model has the advantages of structural design is reasonable, production low in manufacturing cost and operation convenient to use, can realize meeting an emergency to detect and calculating with the supplementary clay poisson's ratio of freezing the clay to provide more accurate mechanics parameter for construction freezing method.
Description
Technical field
The utility model relates to earthwork engineering technique with the apparatus field, specifically a kind of test unit for accurate Calculation frozen clay Poisson ratio.
Background technology
The mechanics parameter of Artificial Frozen Soil is the basis of freezing process design and construction, is the basis determined Artificial Frozen Soil intensity He carry out freezing wall parameter designing, along with the development of Chinese freezing technology, gets more and more to the requirement of the mechanics parameter freezed.But the method for the Poisson ratio of existing measurement frozen clay is recorded by WDT-100 Artificial Frozen Soil single axis test machines, this testing machine is just laterally settling a displacement meter, namely can only record the transverse strain of a point, and the turning point of this point not necessarily elastic-plastic deformation, so there is very large error to the measurement of Poisson ratio, the requirement of present engineering more and more can not be met.
Summary of the invention
Technical problem to be solved in the utility model be to provide a kind of reasonable in design, manufacturing cost is low, easy for operation, can realize detecting the device calculated with auxiliary frozen clay Poisson ratio, i.e. a kind of test unit for accurate Calculation frozen clay Poisson ratio to frozen clay strain.
Technical problem to be solved in the utility model realizes by the following technical solutions:
A kind of test unit for accurate Calculation frozen clay Poisson ratio, comprise base plate, laser instrument, photomodulator, photodetector, signal processor and optical fiber, described laser instrument, photomodulator, photodetector, signal processor is arranged on the upper surface of base plate successively according to order from left to right, described photomodulator, also brace table is provided with between photodetector, the left part of described brace table, right part is arranged with guide chute, all sliding plate is sliding combined with in described guide chute, the top of described brace table is provided with hollow form structure, double threaded screw is horizontally installed with by bearing in described hollow form structure, the left part of described double threaded screw, right part respectively with corresponding sliding plate threaded engagement, two displacement meters are provided with directly over described brace table.The top of described sliding plate is all provided with pick-up unit.
Described laser instrument and photomodulator, photomodulator with pick-up unit, pick-up unit with photodetector, be all connected by optical fiber between photodetector with signal processor.
The upper ends of described brace table has soil sample block, during use, rotated by manipulation double threaded screw, and then order about sliding plate and sliding plate is drawn close mutually, and make pick-up unit be fitted on soil sample block, when external force is carried in after on soil sample block, pick-up unit can be utilized to carry out the detection of transverse strain, make two displacement meters be placed on the upper left side of soil sample block, upper right side simultaneously, the detection of vertical strain can be carried out.
Ultraviolet is launched by laser instrument, adjust after angle through photomodulator, arrive on soil sample block by optical fiber, when the strain of detected soil sample block changes, can be there is corresponding change in the reflection ray of light, namely corresponding change occurs the intensity of light, along with optical fiber imports in photodetector, realize the measurement to soil sample block by the change detecting light intensity, export corresponding data finally by signal processor.
The top of described sliding plate is provided with horizontally disposed Display Rack, and described Display Rack is installed with vertical fixed head, and described pick-up unit is arranged on vertical fixed head.
Described pick-up unit comprises three detecting devices, described detecting device includes trimming bolt, telescopic shaft, spring, Fibre Optical Sensor and guide shaft, described vertical fixed head is provided with circular groove of stepping down, described trimming bolt is arranged on vertical fixed head by the mode level of threaded engagement, one end of described telescopic shaft is connected by bearing with trimming bolt, described guide shaft is arranged on telescopic shaft, and described guide shaft and vertical fixed head are slidably matched, described Fibre Optical Sensor is arranged on the other end of telescopic shaft, described Fibre Optical Sensor and photomodulator, photodetector is connected by optical fiber, described spring housing is contained on telescopic shaft, one end of described spring is against on Fibre Optical Sensor, the other end of described spring is against on vertical fixed head.The utility model amounts to employing six detecting devices, to realize the measurement to transverse strain.Utilize detecting device can realize fine setting, to guarantee that Fibre Optical Sensor is fitted on soil sample block closely.
Left end, the right-hand member of described double threaded screw are all provided with rotating disk.
The hand of spiral of the left part of described double threaded screw, the screw thread of right part is contrary.The utility model can carry out the adjustment of own dimensions according to the dimensions of the soil sample block of reality, namely by rotating double threaded screw, can order about sliding plate mutually draw close or away from, thus can adapt to soil sample block, degree of flexibility is high.
Described trimming bolt with step down the dead in line of circular groove, described in the step down diameter of circular groove be greater than the diameter of telescopic shaft, and described in the step down diameter of circular groove be less than the screw diameter of spring.The benefit of such design is: in the process of fine setting, when trimming bolt rotates, drive telescopic shaft away from soil sample block, telescopic shaft can progressively enter into steps down in circular groove, and now, spring is then blocked in the right side place of vertical fixed head, spring by after compression the elastic restoring force that produces the Fibre Optical Sensor when detecting is fitted on soil sample block closely.
The beneficial effects of the utility model are: the utility model has the advantages such as reasonable in design, manufacturing cost be low and easy for operation, can realize detecting frozen clay strain calculating with auxiliary frozen clay Poisson ratio, thus provide mechanics parameter more accurately for construction freezing method.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Fig. 1 is main TV structure schematic diagram of the present utility model;
Fig. 2 is the I partial enlarged drawing of Fig. 1;
Fig. 3 is the structural representation that sliding plate of the present utility model is connected with detecting device;
The plan structure schematic diagram that Fig. 4 is brace table of the present utility model, rotating disk, sliding plate, detecting device connect.
Embodiment
The technological means realized to make the utility model, creation characteristic, reaching object and effect is easy to understand, below the utility model being set forth further.
As shown in Figures 1 to 4, a kind of test unit for accurate Calculation frozen clay Poisson ratio, comprise base plate 1, laser instrument 2, photomodulator 3, photodetector 4, signal processor 5 and optical fiber 6, described laser instrument 2, photomodulator 3, photodetector 4, signal processor 5 is arranged on the upper surface of base plate 1 according to order from left to right successively, described photomodulator 3, brace table 8 is also provided with between photodetector 4, the left part of described brace table 8, right part is arranged with guide chute 8a, sliding plate 11 is all sliding combined with in described guide chute 8a, the top of described brace table 8 is provided with hollow form structure 8b, double threaded screw 9 is horizontally installed with by bearing in described hollow form structure 8b, the left part of described double threaded screw 9, right part respectively with corresponding sliding plate 11 threaded engagement, two displacement meters 7 are provided with directly over described brace table 8.The top of described sliding plate 11 is all provided with pick-up unit.
Described laser instrument 2 and photomodulator 3, photomodulator 3 with pick-up unit, pick-up unit with photodetector 4, be all connected by optical fiber 6 between photodetector 4 with signal processor 5.
The upper ends of described brace table 8 has soil sample block 12, during use, rotated by manipulation double threaded screw 9, and then order about sliding plate 11 and mutually draw close with sliding plate 11, and make pick-up unit be fitted on soil sample block 12, when external force is carried in after on soil sample block 12, pick-up unit can be utilized to carry out the detection of transverse strain, make two displacement meters 7 be placed on the upper left side of soil sample block 12, upper right side simultaneously, the detection of vertical strain can be carried out.
Ultraviolet is launched by laser instrument 2, after angle adjusted by photomodulator 3, arrive on soil sample block 12 by optical fiber 6, when the strain of detected soil sample block 12 changes, can be there is corresponding change in the reflection ray of light, namely corresponding change occurs the intensity of light, along with optical fiber 6 imports in photodetector 4, realize the measurement to soil sample block 12 by the change detecting light intensity, export corresponding data finally by signal processor 5.
The top of described sliding plate 11 is provided with horizontally disposed Display Rack 11a, and described Display Rack 11a is installed with vertical fixed head 11b, and described pick-up unit is arranged on vertical fixed head 11b.
Described pick-up unit comprises three detecting devices 13, described detecting device 13 includes trimming bolt 14, telescopic shaft 15, spring 16, Fibre Optical Sensor 17 and guide shaft 18, described vertical fixed head 11b is provided with the circular groove 11c that steps down, described trimming bolt 14 is arranged on vertical fixed head 11b by the mode level of threaded engagement, one end of described telescopic shaft 15 is connected by bearing with trimming bolt 14, described guide shaft 18 is arranged on telescopic shaft 15, and described guide shaft 18 is slidably matched with vertical fixed head 11b, described Fibre Optical Sensor 17 is arranged on the other end of telescopic shaft 15, described Fibre Optical Sensor 17 and photomodulator 3, photodetector 4 is connected by optical fiber 6, described spring 16 is sleeved on telescopic shaft 15, one end of described spring 16 is against on Fibre Optical Sensor 17, the other end of described spring 16 is against on vertical fixed head 11b.The utility model amounts to employing six detecting devices 13, to realize the measurement to transverse strain.Utilize detecting device 13 can realize fine setting, to guarantee that Fibre Optical Sensor 17 is fitted on soil sample block 12 closely.
Left end, the right-hand member of described double threaded screw 9 are all provided with rotating disk 10.
The hand of spiral of the described left part of double threaded screw 9, the screw thread of right part is contrary.The utility model can carry out the adjustment of own dimensions according to the dimensions of the soil sample block 12 of reality, namely by rotating double threaded screw 9, can order about sliding plate 11 mutually draw close or away from, thus can adapt to soil sample block 12, degree of flexibility is high.
The dead in line of described trimming bolt 14 and the circular groove 11c that steps down, described in the step down diameter of circular groove 11c be greater than the diameter of telescopic shaft 15, and described in the step down diameter of circular groove 11c be less than the screw diameter of spring 16.The benefit of such design is: in the process of fine setting, when trimming bolt 14 rotates, drive telescopic shaft 15 away from soil sample block 12, telescopic shaft 15 can progressively enter into steps down in circular groove 11c, and now, 16, spring is blocked in the right side place of vertical fixed head 11b, spring 16 by after compressing the elastic restoring force that produces the Fibre Optical Sensor 17 when detecting is fitted on soil sample block 12 closely.
During use, first soil sample block 12 is placed on the upper end of brace table 8, rotary turnplate 10 subsequently, sliding plate 11 is drawn close mutually, when Fibre Optical Sensor 17 is near soil sample block 12, turn trimming bolt 14, order about telescopic shaft 15 under the guide effect of guide shaft 18 near soil sample block 12, until Fibre Optical Sensor 17 is against on soil sample block 12, adopts spring 16 can guarantee that Fibre Optical Sensor 17 is fitted in soil sample block 12 closely, ensure that the accuracy that transverse strain detects; Afterwards two displacement meters 7 are placed on upper left side, the upper right side of soil sample block 12, the detection of vertical strain can be carried out; Thus, Poisson ratio now can be drawn.
Use soil sample more than maintenance 24h under subzero temperature when the utility model starts, carry out under the cryogenic box subzero temperature of WDT-100 single axis test machines, then at the uniform velocity load by the speed of 1%, soil sample block 12 has just started as elastic deformation, after 25 ~ 35s, soil sample block 12 starts plastic yield occurs, stress-strain curve can be obtained by external computer equipment, record transverse strain and time curve by Fibre Optical Sensor 17, stress-strain curve finds the strain stress of turning point
a, then by ε
abe divided into 10 equal portions, each is the corresponding transverse strain of strain vertically, respectively a corresponding Poisson ratio υ
1, υ
2... υ
10, then observe the fluctuation situation of Poisson ratio with mean square deviation formula, that is:
Wherein υ
i=1/10 (υ
1+ υ
2+ ... υ
10).
By by ε
abe divided into 10 equal portions, compared to traditional method, make detect and result of calculation more accurate.
More than show and describe ultimate principle of the present utility model, principal character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; the just principle of the present utility model described in above-described embodiment and instructions; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (5)
1. the test unit for accurate Calculation frozen clay Poisson ratio, comprise base plate (1), laser instrument (2), photomodulator (3), photodetector (4), signal processor (5) and optical fiber (6), it is characterized in that: described laser instrument (2), photomodulator (3), photodetector (4), signal processor (5) is arranged on successively according to order from left to right on the upper surface of base plate (1), described photomodulator (3), brace table (8) is also provided with between photodetector (4), the left part of described brace table (8), right part is arranged with guide chute (8a), sliding plate (11) is all sliding combined with in described guide chute (8a), the top of described brace table (8) is provided with hollow form structure (8b), double threaded screw (9) is horizontally installed with by bearing in described hollow form structure (8b), the left part of described double threaded screw (9), right part respectively with corresponding sliding plate (11) threaded engagement, two displacement meters (7) are provided with directly over described brace table (8),
The top of described sliding plate (11) is all provided with pick-up unit;
Described laser instrument (2) and photomodulator (3), photomodulator (3) with pick-up unit, pick-up unit with photodetector (4), be all connected by optical fiber (6) between photodetector (4) with signal processor (5).
2. a kind of test unit for accurate Calculation frozen clay Poisson ratio according to claim 1, it is characterized in that: the top of described sliding plate (11) is provided with horizontally disposed Display Rack (11a), described Display Rack (11a) is installed with vertical fixed head (11b), described pick-up unit is arranged on vertical fixed head (11b);
Described pick-up unit comprises three detecting devices (13), described detecting device (13) includes trimming bolt (14), telescopic shaft (15), spring (16), Fibre Optical Sensor (17) and guide shaft (18), described vertical fixed head (11b) is provided with circular groove of stepping down (11c), described trimming bolt (14) is arranged on vertical fixed head (11b) by the mode level of threaded engagement, one end of described telescopic shaft (15) is connected by bearing with trimming bolt (14), described guide shaft (18) is arranged on telescopic shaft (15), and described guide shaft (18) and vertical fixed head (11b) are slidably matched, described Fibre Optical Sensor (17) is arranged on the other end of telescopic shaft (15), described Fibre Optical Sensor (17) and photomodulator (3), photodetector (4) is connected by optical fiber (6), described spring (16) is sleeved on telescopic shaft (15), one end of described spring (16) is against on Fibre Optical Sensor (17), the other end of described spring (16) is against on vertical fixed head (11b).
3. a kind of test unit for accurate Calculation frozen clay Poisson ratio according to claim 2, it is characterized in that: the dead in line of described trimming bolt (14) and circular groove (11c) that step down, the diameter of described circular groove of stepping down (11c) is greater than the diameter of telescopic shaft (15), and described in the step down diameter of circular groove (11c) be less than the screw diameter of spring (16).
4. a kind of test unit for accurate Calculation frozen clay Poisson ratio according to claim 1, is characterized in that: the left end of described double threaded screw (9), right-hand member are all provided with rotating disk (10).
5. a kind of test unit for accurate Calculation frozen clay Poisson ratio according to claim 1, is characterized in that: the hand of spiral of the left part of described double threaded screw (9), the screw thread of right part is contrary.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520762075.3U CN204964309U (en) | 2015-09-29 | 2015-09-29 | A test device that is used for refined calculation to freeze clay poisson's ratio |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520762075.3U CN204964309U (en) | 2015-09-29 | 2015-09-29 | A test device that is used for refined calculation to freeze clay poisson's ratio |
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| Publication Number | Publication Date |
|---|---|
| CN204964309U true CN204964309U (en) | 2016-01-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520762075.3U Expired - Fee Related CN204964309U (en) | 2015-09-29 | 2015-09-29 | A test device that is used for refined calculation to freeze clay poisson's ratio |
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| CN (1) | CN204964309U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105784495A (en) * | 2016-05-23 | 2016-07-20 | 安徽理工大学 | Device for measuring lateral pressure coefficient and Poisson's ratio of geotechnical material |
| CN107144465A (en) * | 2017-04-10 | 2017-09-08 | 江苏大学 | A kind of method of testing of fly maggot Poisson's ratio |
-
2015
- 2015-09-29 CN CN201520762075.3U patent/CN204964309U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105784495A (en) * | 2016-05-23 | 2016-07-20 | 安徽理工大学 | Device for measuring lateral pressure coefficient and Poisson's ratio of geotechnical material |
| CN107144465A (en) * | 2017-04-10 | 2017-09-08 | 江苏大学 | A kind of method of testing of fly maggot Poisson's ratio |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160113 Termination date: 20160929 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |