CN109975132A - A kind of stacked ring type direct shear apparatus - Google Patents
A kind of stacked ring type direct shear apparatus Download PDFInfo
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- CN109975132A CN109975132A CN201910297188.3A CN201910297188A CN109975132A CN 109975132 A CN109975132 A CN 109975132A CN 201910297188 A CN201910297188 A CN 201910297188A CN 109975132 A CN109975132 A CN 109975132A
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- 238000006073 displacement reaction Methods 0.000 claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 25
- 239000010959 steel Substances 0.000 claims abstract description 25
- 239000002689 soil Substances 0.000 claims abstract description 22
- 238000010008 shearing Methods 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 14
- 230000008569 process Effects 0.000 claims abstract description 12
- 238000013016 damping Methods 0.000 claims abstract description 8
- 230000003028 elevating effect Effects 0.000 claims abstract description 6
- 239000011888 foil Substances 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 4
- 229920000742 Cotton Polymers 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims 1
- 239000011521 glass Substances 0.000 claims 1
- 230000008450 motivation Effects 0.000 claims 1
- 238000012360 testing method Methods 0.000 abstract description 11
- 238000005056 compaction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000011161 development Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000005341 toughened glass Substances 0.000 description 3
- 230000006870 function Effects 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000003351 stiffener Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- 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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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides a kind of stacked ring type direct shear apparatus, including consolidated structure, staight scissors structure, shear box；Consolidated structure includes work box, motor, hydraulic jack oil cylinder, elevating screw, small steel plate, big steel plate, the first control switch, bottom plate, decoupling rod, bearing plate, damping spring, fixed plate, sliding rail, detent protrusion, detent seat；Staight scissors structure includes supporting steel frame, control switch, normal force bringing device, vertical load sensor and vertical displacement sensor, horizontal loading bringing device, horizontal support device, shearing force load sensor, magnet, horizontal displacement sensors, shear box includes upper shear box and lower shear box, and centre is placed with folded ring.The shear box of the invention slidably reciprocates on two-orbit, ensure that manually or electrically compacting process can be completed in equipment, and then complete common direct shearing test or stacked ring type direct shearing test, avoid it is original under the conditions of be compacted outside equipment after be transported to direct shear apparatus and cause to carry inconvenient and soil disturbance.
Description
Technical field
The invention belongs to technical field of measuring equipment, more particularly, to a kind of stacked ring type direct shear apparatus.
Background technique
Structure is complicated for electronic compactor currently on the market, and has a single function, and is not provided with decoupling rod and damping spring, no
The shaking that shear box generates in compacting process up and down can be reduced, be unfavorable for the stability of upper and lower shear box work, be not easy to
Lower shear box take and up and down shear box closely compacting object, be not provided with shield, be not easy to upper and lower shear box into
Row sound insulation processing cannot carry out barrier to the object of splash in compacting process.Current most of most sizes of direct shear apparatus are smaller, no
It is able to satisfy boundary effect required in Practical Project, this validity for influencing to will lead to test data and authenticity reduce,
It only include upper shear box there are also many interface shearing instruments, lower shear box is stiffener plate, will cause geosynthetics in this way and opens
Friction of the boundary strength between soil particle and steel plate at mouthful, rather than the real friction between particle and grid, gained knot
Fruit is low compared with truth.
Summary of the invention
In view of this, the invention is directed to a kind of stacked ring type direct shear apparatus, to solve to mention in above-mentioned background technique
The problem of.
In order to achieve the above objectives, the technical solution of the invention is achieved in that
A kind of stacked ring type direct shear apparatus, including consolidated structure, staight scissors structure and shear box；
The consolidated structure includes work box, and the upper end of the work box is fixedly installed with motor, the motor
Side is equipped with hydraulic jack oil cylinder, and hydraulic jack oil cylinder lower end is equipped with elevating screw, and the end of elevating screw has small steel
Plate is pasted with big steel plate on small steel plain, and the front surface of the work box is provided with the first control switch, the work box
Lower end is fixedly connected with bottom plate, and the lower end of the bottom plate is fixedly installed with decoupling rod, and the lower end of the decoupling rod is fixedly connected with
Bearing plate, the outside of the decoupling rod are socketed with damping spring, and the side of the work box is fixedly installed fixed plate, the bottom
The surface of plate is provided with sliding rail, has detent raised on sliding rail, the left end side of the sliding rail is connected with detent
Seat, the shear box can slide on sliding rail；
The staight scissors structure includes supporting steel frame, and the right side of the supporting steel frame is equipped with the second control switch, the support
Steelframe top is equipped with normal force bringing device, and the normal force bringing device includes servo loading equipment and escalator, institute
Normal force bringing device front end is stated equipped with vertical load sensor and vertical displacement sensor, the right side of the supporting steel frame is equipped with
Horizontal loading bringing device, the horizontal loading bringing device include servo devices and escalator, the supporting steel
Horizontal support device is equipped on the left of frame, the horizontal support device front end is equipped with shearing force load sensor, consolidates on the bottom plate
Surely it is equipped with magnet, magnet is equipped with horizontal displacement sensors；
The shear box includes upper shear box and lower shear box, is placed with folded ring among the upper shear box and lower shear box
Circle, the folded ring right side are pasted with foil gauge and conducting wire；
In carrying out compacting process, shear box setting is in detent seat upper end, and in carrying out shear history, shear box setting exists
On sliding rail, in normal force bringing device lower end, horizontal displacement sensors are arranged in shear box left end.
It further, further include the camera, data acquisition device and computer being arranged in outside shear box, wherein perpendicular
To load sensor and vertical displacement sensor, shearing force load sensor, horizontal displacement sensors and foil gauge and conducting wire
Data acquisition device is connected by data line, data acquisition device connects computer by data line.
It further, further include soil digging device, the soil digging device is bottomless hollow round table, is arranged in bottom plate lower end.
Further, further include shield, shield is arranged in shear box upper end in compacting process, it is logical with shear box
Shaft rotation connection is crossed, the shield is internally provided with acoustical cotton.
Further, further include vertical pressure load plate, in shear history, the setting of vertical pressure load plate is being sheared
Box upper end.
Further, after completing compacting, when shear box is slided into staight scissors structure division, horizontal support device is passed through into spiral shell
Silk is adjusted and is raised.
Further, the fixed plate and shear box are slidably connected by sliding slot.
Further, there are four the decoupling rod is arranged altogether.
Further, the folded ring uses transparent toughened glass.
Further, the shear box uses side length for the rectangular steel loop of 10cm.
Compared with the existing technology, a kind of stacked ring type direct shear apparatus described in the invention has the advantage that
(1) the invention can reduce shear box in the compacting course of work by being provided with decoupling rod and damping spring
The shaking of middle generation stablizes compacting work convenient for shear box, guarantees the uniformity of compacting；
(2) the invention is taken shear box and short distance compact by being provided with sliding rail convenient for user
Body improves the efficiency of compacting；
(3) the invention can carry out splashproof processing to the object in upper and lower shear box, keep away by being provided with protective cover
The object splash exempted from upper and lower shear box comes out, and protects the personal safety of user, while also effective lattice block what compacting generated
Noise protects the hearing health of user of service；
(4) the invention by be provided with soil digging device, by shear box by sliding rail slide at soil digging device into
Row cleaning, it is ensured that take soil convenient and efficient in equipment；
(5) under the control of the invention control switch, the function of compacting automatically, automatic range may be implemented, mention significantly
High the degree of automation of soil compaction test；
(6) the folded ring of the invention by using transparent toughened glass and is equipped with camera, can be seen with real-time tracking
Survey the development and change process of shear surface.
Detailed description of the invention
The attached drawing for constituting a part of the invention is used to provide to further understand the invention, present invention wound
The illustrative embodiments and their description made are used to explain the present invention creation, do not constitute the improper restriction to the invention.?
In attached drawing:
Fig. 1 is the structural schematic diagram of the direct shear apparatus of the invention；
Fig. 2 is the schematic top plan view of the direct shear apparatus of the invention；
Fig. 3 is the partial schematic diagram of the shear box of the invention；
Fig. 4 is the partial schematic diagram of the shear box of the invention；
Fig. 5 is the schematic diagram of the shield of the invention；
Fig. 6 is the schematic diagram of the sliding rail of the invention；
Fig. 7 is the top view of the soil digging device of the invention；
Fig. 8 is the front view of the soil digging device of the invention.
Description of symbols:
1- work box；The first control switch of 2-；3- fixed plate；4- sliding rail；5- detent protrusion；6- bottom plate；7- damping
Bar；8- damping spring；9- bearing plate；10- motor；The big steel plate of 11-；12- hydraulic jack oil cylinder；13- detent seat；14- is cut
Cut box；15- shield；16- soil digging device；17- horizontal support device；18- vertical pressure load plate；The second control switch of 19-；
20- normal force bringing device；The vertical load sensor of 21- and vertical displacement sensor；22- shearing force load sensor；23- water
Prosposition displacement sensor；24- horizontal loading bringing device；25- data acquisition device；26- camera；27- foil gauge and conducting wire；
28- folds ring；29- magnet.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the invention can
To be combined with each other.
In the description of the invention, it is to be understood that term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description the invention and simplifies description, rather than indicate
Or imply that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore cannot understand
For the limitation to the invention.In addition, term " first ", " second " etc. are used for description purposes only, and should not be understood as indicating
Or it implies relative importance or implicitly indicates the quantity of indicated technical characteristic." first ", " second " etc. are defined as a result,
Feature can explicitly or implicitly include one or more of the features.In the description of the invention, unless separately
It is described, the meaning of " plurality " is two or more.
In the description of the invention, it should be noted that unless otherwise clearly defined and limited, term " peace
Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary,
It can be the connection inside two elements.For the ordinary skill in the art, on being understood by concrete condition
State concrete meaning of the term in the invention.
The present invention will be described in detail below with reference to the accompanying drawings and embodiments creates.
As shown in figures 1-8, the invention discloses a kind of stacked ring type direct shear apparatus, this equipment mainly includes compacting knot
Structure, staight scissors structure and shear box, consolidated structure and staight scissors structure two parts are connected by two-orbit, and shear box 14 is in double track
It slidably reciprocates on road, it is ensured that manually or electrically compacting process can be completed in equipment, and then complete common direct shearing test or folded
Ring type direct shearing test, avoid it is original under the conditions of be compacted outside equipment after be transported to direct shear apparatus and cause to carry the inconvenient and soil body and disturb
It is dynamic.
Wherein, consolidated structure part includes work box 1, and the upper end of work box 1 is fixedly installed with 10, the side of motor 10
Equipped with hydraulic jack oil cylinder 12, to elevating screw is equipped under hydraulic jack oil cylinder 12, the end of elevating screw has small steel
Plate, is pasted with big steel plate 11 on small steel plain, and the front surface of work box 1 is provided with the first control switch 2, and work box 1
Lower end is fixedly connected with bottom plate 6, and the lower end of bottom plate 6 is fixedly installed with decoupling rod 7.By the way that decoupling rod 7 and damping spring 8 is arranged,
The shaking that shear box 14 generates in the compacting course of work can be reduced, stablize compacting work convenient for shear box 14.It is arranged simultaneously
Sliding rail 4, convenient for user take shear box 14 and closely compacting object, improve the efficiency of compacting, be provided with protect
Shield 15 avoids the object splash in upper and lower shear box 14 from coming out, and effective lattice block the noise that compacting generates, and protects user of service
Hearing health.
Staight scissors part includes that sliding rail 4, bottom plate 6, shear box 14, folded ring 28 (are placed in by several steel loop circles stacking
Among upper and lower shear box), horizontal loading bringing device 24 and the normal force bringing device 20 being mounted on crossbeam, horizontal loading is applied
Feeder apparatus 24 is realized that normal force bringing device 20 is also by the mode of stepper motor and lead screw reality by the mode of stepper motor and lead screw
It is existing.The load that the load and horizontal direction that the vertical direction applies apply is measured by load transducer.Vertical displacement and water
Prosposition moves then by the displacement sensor that is fixed on lead screw to be controlled.Direct shear test can be than more actually reflecting soil
Practical shearing strength characteristic.The form of transparent toughened glass is used due to folding ring 28, and is equipped with camera 26 in front,
The development and change process of shear surface can be observed with real-time tracking.Horizontal displacement sensors 23 are provided on the left of folded ring 28, are passed through
Magnet 29 is fixed on bottom plate 6, it is ensured that the precise measurement of displacement；Foil gauge is pasted on the right side of folded ring 28, foil gauge is by leading
Line is transmitted to data acquisition device 25.It further include vertical pressure load plate 18, periphery and the upper shearing of vertical pressure load plate 18
There are certain gaps for the inside kissing merging of box, it is ensured that will not generate and rub with upper shear box side wall when applying vertical pressure
It wipes.
The normal force bringing device 20 of the invention forms mechanical enforcement division using servo loading equipment, escalator
Point, it is in addition also assembled with vertical load sensor and vertical displacement sensor 21 and data acquisition device 25 constitutes vertical force
Control mechanism constitutes the closed-loop control of normal force device, used equipment, each biography by operation panel and computer software
Sensor and computer software are all existing products, are not the innovative points of the application.
The horizontal loading bringing device 24 of the invention forms mechanical execute using servo loading equipment, escalator
Part, is in addition also assembled with shearing force load sensor 22 and horizontal displacement sensors 23 and data acquisition device 25 constitutes
Horizontal force control mechanism constitutes the closed-loop control of horizontal direction power device by operation panel and computer software, used
Equipment, each sensor and computer software be all existing product, be not the innovative point of the application.
It is not directed to part in the device to be the same as those in the prior art or can be realized by using the prior art, the invention
It is scientific and reasonable for structure, it is simple to operate, be easy to use.
The course of work of the invention: shear box 14 is slided into 4 middle position of sliding rail first, in shear box 14
It is packed into the soil body to be tested, shear box 14 is slided into consolidated structure position, shield 15 in connection, with detent protrusion 5 and admittedly
Fixed board 3 is fixed by shear box 14, soil compaction moves in circles in the first control switch 2 setting Compaction Effort, by soil compaction
To desired height.Then fixed plate 3 and detent protrusion 5 are laid down, shear box 14 is slided into staight scissors structure division, by horizontal position
Displacement sensor 23, shearing force load sensor 22, vertical load sensor and vertical displacement sensor 21 and horizontal loading are applied
Feeder apparatus 24, horizontal support device 17, normal force bringing device 20 are placed into designated position, in a computer setting shearing speed
Degree, and then complete shearing test.Finally the shear box after test is slided at soil digging device 16, soil is taken out, experiment finishes.
The measurement of entire equipment load sensor and displacement sensor is completed by data acquisition device, completes vertical load, horizontal load
And the control of vertical displacement, horizontal displacement, and complete in real time and the data exchange of computer, the instruction for receiving computer and completion
Relevant control.
The innovation of the invention is that manually or automatically compaction test and soil digging process can be carried out in equipment, is not necessarily to
Shear box 14 is carried back and forth, stacked ring type direct shear test can study soil destruction position, camera utilization can in real time with
The development and change process of track observation shear surface.Displacement sensor is provided on the left of folded ring 28, it is ensured that the essence being displaced between folded ring
Really measurement.It is pasted with foil gauge and conducting wire 27 on the right side of folded ring, the stress situation that folded ring is subject to can be observed in real time.
The foregoing is merely the preferred embodiments of the invention, are not intended to limit the invention creation, all at this
Within the spirit and principle of innovation and creation, any modification, equivalent replacement, improvement and so on should be included in the invention
Protection scope within.
Claims (10)
1. a kind of stacked ring type direct shear apparatus, it is characterised in that: including consolidated structure, staight scissors structure and shear box (14)；
The consolidated structure includes work box (1), and the upper end of the work box (1) is fixedly installed with motor (10), the electricity
The side of motivation (10) is equipped with hydraulic jack oil cylinder (12), and hydraulic jack oil cylinder (12) lower end is equipped with elevating screw, lifting
The end of screw rod has small steel plate, is pasted with big steel plate (11) on small steel plain, the front surface of the work box (1) is provided with
The lower end of first control switch (2), the work box (1) is fixedly connected with bottom plate (6), the fixed peace in the lower end of the bottom plate (6)
Equipped with decoupling rod (7), the lower end of the decoupling rod (7) is fixedly connected with bearing plate (9), the external socket of the decoupling rod (7)
Have damping spring (8), the side of the work box (1) is fixedly installed fixed plate (3), and the surface of the bottom plate (6) is provided with
Sliding rail (4) has on sliding rail (4) detent raised (5), and the left end side of the sliding rail (4) is connected with detent seat
(13), the shear box (14) can be slided on sliding rail；
The staight scissors structure includes supporting steel frame, and the right side of the supporting steel frame is equipped with the second control switch (19), the support
Steelframe top is equipped with normal force bringing device (20), and the normal force bringing device (20) includes servo loading equipment and automatic liter
Drop machine, normal force bringing device (20) front end are equipped with vertical load sensor and vertical displacement sensor (21), the branch
The right side for supportting steelframe is equipped with horizontal loading bringing device (24), and the horizontal loading bringing device (24) includes servo devices
And escalator, the supporting steel frame left side are equipped with horizontal support device (17), the horizontal support device front end is equipped with and cuts
Shear force load sensor (22) is fixed with magnet (29) on the bottom plate (6), and magnet (29) is equipped with horizontal displacement sensors
(23)；
The shear box (14) includes upper shear box and lower shear box, is placed with folded ring among the upper shear box and lower shear box
It encloses (28), is pasted with foil gauge and conducting wire (27) on the right side of the folded ring (28)；
In carrying out compacting process, shear box (14) setting is in detent seat (13) upper end, in carrying out shear history, shear box
(14) it is arranged on sliding rail (4), in normal force bringing device (20) lower end, horizontal displacement sensors (23) setting is being sheared
Box (14) left end.
2. a kind of stacked ring type direct shear apparatus according to claim 1, it is characterised in that: further include setting shear box (14) outside
Camera (26), data acquisition device (25) and computer, wherein vertical load sensor and vertical displacement sensor
(21), shearing force load sensor (22), horizontal displacement sensors (23) and foil gauge and conducting wire (27) pass through data line
It connects data acquisition device (25), data acquisition device (25) connects computer by data line.
3. a kind of stacked ring type direct shear apparatus according to claim 1, it is characterised in that: it further include soil digging device (16), it is described
Soil digging device (16) is bottomless hollow round table, is arranged in bottom plate (6) lower end.
4. a kind of stacked ring type direct shear apparatus according to claim 1, it is characterised in that: further include shield (15), be compacted
Shield (15) are arranged in shear box (14) upper end in the process, are rotatablely connected with shear box (14) by shaft, the protection
Cover (15) is internally provided with acoustical cotton.
5. a kind of stacked ring type direct shear apparatus according to claim 1, it is characterised in that: further include vertical pressure load plate
(18), in shear history, vertical pressure load plate (18) are arranged in shear box (14) upper end.
6. a kind of stacked ring type direct shear apparatus according to claim 1, it is characterised in that: after completing compacting, by shear box
(14) when sliding into staight scissors structure division, horizontal support device (17) is raised by screw adjusting.
7. a kind of stacked ring type direct shear apparatus according to claim 1, it is characterised in that: the fixed plate (3) and shear box
(14) it is slidably connected by sliding slot.
8. a kind of stacked ring type direct shear apparatus according to claim 1, it is characterised in that: the decoupling rod (7) is provided with four altogether
It is a.
9. a kind of stacked ring type direct shear apparatus according to claim 1, it is characterised in that: the folded ring (29) uses transparent steel
Change glass.
10. a kind of stacked ring type direct shear apparatus according to claim 1, it is characterised in that: the shear box (14) uses side length
For the rectangular steel loop of 10cm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910297188.3A CN109975132B (en) | 2019-04-15 | 2019-04-15 | Stacked ring type direct shear apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910297188.3A CN109975132B (en) | 2019-04-15 | 2019-04-15 | Stacked ring type direct shear apparatus |
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| CN109975132A true CN109975132A (en) | 2019-07-05 |
| CN109975132B CN109975132B (en) | 2024-04-19 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110672433A (en) * | 2019-08-27 | 2020-01-10 | 立方通达实业（天津）有限公司 | Can realize base of rock shearing seepage flow comprehensive simulation equipment of pressure release |
| CN111896446A (en) * | 2020-07-09 | 2020-11-06 | 河海大学 | Contact surface shear seepage test device and test method considering temperature effect |
| CN112816657A (en) * | 2020-12-31 | 2021-05-18 | 浙江省工程勘察设计院集团有限公司 | Solid waste and pond sediment mechanical test equipment |
| CN113533065A (en) * | 2021-07-15 | 2021-10-22 | 武汉吉欧信海洋科技股份有限公司 | In-situ soil external friction angle testing device and testing method |
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| CN110672433A (en) * | 2019-08-27 | 2020-01-10 | 立方通达实业（天津）有限公司 | Can realize base of rock shearing seepage flow comprehensive simulation equipment of pressure release |
| CN111896446A (en) * | 2020-07-09 | 2020-11-06 | 河海大学 | Contact surface shear seepage test device and test method considering temperature effect |
| CN112816657A (en) * | 2020-12-31 | 2021-05-18 | 浙江省工程勘察设计院集团有限公司 | Solid waste and pond sediment mechanical test equipment |
| CN113533065A (en) * | 2021-07-15 | 2021-10-22 | 武汉吉欧信海洋科技股份有限公司 | In-situ soil external friction angle testing device and testing method |
| CN113533065B (en) * | 2021-07-15 | 2022-03-11 | 武汉吉欧信海洋科技股份有限公司 | In-situ soil external friction angle testing device and testing method |
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