CN114563288A - Roadbed settlement test device suitable for vibration condition - Google Patents
Roadbed settlement test device suitable for vibration condition Download PDFInfo
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- CN114563288A CN114563288A CN202210046309.9A CN202210046309A CN114563288A CN 114563288 A CN114563288 A CN 114563288A CN 202210046309 A CN202210046309 A CN 202210046309A CN 114563288 A CN114563288 A CN 114563288A
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- 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
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/36—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by pneumatic or hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- 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
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0044—Pneumatic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0236—Other environments
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0244—Tests performed "in situ" or after "in situ" use
- G01N2203/0246—Special simulation of "in situ" conditions, scale models or dummies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0258—Non axial, i.e. the forces not being applied along an axis of symmetry of the specimen
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0298—Manufacturing or preparing specimens
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a roadbed settlement test device suitable for a vibration condition, which comprises a test bed, wherein a vibrating table and a soil column barrel are sequentially arranged on the test bed upwards, a test frame with the top end positioned above the soil column barrel is erected on the test bed, a starting actuator is arranged below the top end of the test frame, the bottom end of the starting actuator is connected with a loading plate in sliding fit in the soil column barrel through a loading rod, and the upper part and the lower part in the soil column barrel are respectively communicated with a March's flask through pipelines. The roadbed settlement test device suitable for the vibration condition can simulate the influence of vibration generated when a vehicle passes by on the settlement of the highway, so that the roadbed settlement test device plays a positive role in the use and maintenance of the highway and prolongs the service life of the highway.
Description
Technical Field
The invention belongs to the technical field of roadbed testing systems, and particularly relates to a roadbed settlement testing device suitable for a vibration condition.
Background
Loess is widely distributed in northwest areas of China and is thick in coverage, so that the loess plays an irreplaceable role as one of important building materials in industrial and civil buildings. Along with the rapid construction pace of loess areas brought forward by the strategy of western development, particularly the great activity of the construction of some infrastructures, new vitality is injected into the local economic construction to a great extent. Most loess has collapsible nature, and the collapsible nature of loess is the unique characteristic of loess also, and after collapsible loess receives water under certain pressure effect and soaks, obvious additional subsides can take place for the soil body.
With the rapid development of the times, the use requirements on roads are increased day by day, the traffic flow is increased day by day, and the vehicles can vibrate the road surfaces when running on the roads. The damage to the road base is generated to different degrees, the service life of the road is influenced, and even the normal use of the road is influenced. The device simulates the vehicle vibration to test the settlement of the road surface, qualitatively analyzes the settlement of the road under the vibration condition, and provides theoretical support for the use and maintenance of the road.
Disclosure of Invention
The invention aims to provide a roadbed settlement test device suitable for a vibration condition, which can simulate the influence of vibration generated when a vehicle passes through the roadbed settlement test device on highway settlement, further play a positive role in the use and maintenance of the highway and prolong the service life of the highway.
The technical scheme adopted by the invention is as follows: roadbed settlement test device suitable for under the vibration condition, including the test bench, upwards be equipped with shaking table and soil column section of thick bamboo on the test bench in proper order, the test bench is put on the shelf and is equipped with the test bench that the top is located soil column section of thick bamboo top, and the top below of test bench is equipped with starting actuator, and starting actuator's bottom is connected with the load board of sliding fit in soil column section of thick bamboo through the loading pole, and upper portion and lower part in the soil column section of thick bamboo respectively have a mahalanobis bottle through the pipeline intercommunication.
The present invention is also characterized in that,
and a suction sensor and a moisture sensor are arranged on the inner wall of the soil column barrel.
And a displacement sensor connected to the outer wall of the loading rod is arranged at a position below the top end of the test frame and on one side of the starting actuator.
And a filtering layer with the top end not lower than the communication position of the lower part of the soil column cylinder and the Ma's bottle is laid at the bottom of the soil column cylinder.
The top end of the Ma's bottle is provided with a rubber plug, the side wall of the Ma's bottle is provided with a piston, and the bottom of the Ma's bottle is downwards provided with an electronic scale and a test bed in sequence.
One side of the vibration table is electrically connected with a vibration control table.
The test stand is erected on the test stand through the rod frames arranged on two sides of the vibration table in parallel, and flanges are arranged at the connecting positions of the test stand and the two rod frames.
The beneficial effects of the invention are:
(1) the invention achieves a test for simulating the influence of vibration generated when different types of traffic flow and vehicle speed pass through a road surface on the settlement of the road by controlling different vibration frequencies, vibration amplitudes and vibration time.
(2) The invention achieves a test for simulating the influence of vibration generated when traffic flow passes on the settlement of highways of different levels by controlling different water contents and compaction degrees of soil bodies.
(3) The invention can simulate the test of the influence of vibration generated when vehicles pass through the road surface under the condition of water accumulation on the settlement of the road.
(4) The invention can carry out multi-factor control, so that the test is more consistent with the actual engineering working condition.
Drawings
Fig. 1 is a schematic structural diagram of a roadbed settlement test device suitable for the vibration condition.
In the figure, 1, a test bed, 2, a rod frame, 3, a test frame, 4, a flange, 5, an earth pillar barrel, 6, a screw, 7, a gasket, 8, a suction sensor, 9, a moisture sensor, 10, a filter layer, 11, a loading rod, 12, a starting actuator, 13, a displacement sensor, 14, a vibration table, 15, a vibration control table, 16, an electronic scale, 17, a water outlet, 18, a Ma's bottle, 19, a piston, 20, a rubber plug, 21, a water inlet, 22, a test bed and 23, a computer acquisition system are arranged.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention provides a roadbed settlement test device suitable for a vibration condition, which comprises a test bed 1, wherein a vibration table 14 and a soil column casing 5, one side of which is electrically connected with a vibration control table 15, are sequentially arranged on the test bed 1 upwards, a test frame 3 with the top end positioned above the soil column casing 5 is erected on the test bed 1 through rod frames 2 arranged on two sides of the vibration table 14 in parallel, and flanges 4 are arranged at the connecting positions of the test frame 3 and the two rod frames 2 and used for adjusting the height of the test frame 3, as shown in figure 1. A starting actuator 12 is arranged below the top end of the test frame 3, and a displacement sensor 13 connected to the outer wall of the loading rod 11 is arranged at a position on one side of the starting actuator 12. The bottom end of the starting actuator 12 is connected with a loading plate which is in sliding fit with the soil column barrel 5 through a loading rod 11, the upper part and the lower part in the soil column barrel 5 are respectively communicated with a March's flask 18 through pipelines, water in the March's flask 18 above enters the soil column barrel 5 through a water outlet 17 and a water inlet 21, and the water inlet 21 can be arranged on the loading plate to move up and down along with the loading plate, so that the height is not determined well when the water is directly arranged on the side wall of the soil column barrel 5; the water seeped from the bottom of the soil column tube 5 is filtered by the filter layer 10 and then enters the Mariotte bottles 18 below through the water outlet 17 below and the water inlet 21 below, the top ends of the two Mariotte bottles 18 are provided with rubber plugs 20, the side walls of the two Mariotte bottles are provided with pistons 19, and the bottom of the two Mariotte bottles is provided with an electronic scale 16 and a test bed 22 downwards in sequence. The inner wall of the soil column barrel 5 is provided with a suction sensor 8 and a moisture sensor 9. The bottom of the soil column barrel 5 is paved with a filter layer 10 the top end of which is not lower than the position where the lower part of the soil column barrel 5 is communicated with the Ma bottle 18, namely the lower water outlet 17.
The invention is suitable for the subgrade settlement test device under the vibration condition and specifically introduces the following components:
(1) the soil column barrel 5 is a carrier for preparing a sample and loading the soil column sample, adopts a cylindrical barrel body made of organic glass, and has the outer diameter of 160mm, the inner diameter of 150mm and the thickness of 5 mm.
(2) Four sections of soil column barrels 5 are prepared, and soil column tests with different heights are completed by combining the soil column barrels 5 according to the designed soil column heights of 30cm, 50cm, 70cm and 90 cm. The heights are respectively 30cm, 25 cm and 20cm, a gasket 7 and an inner hexagonal screw 6 are used between the two, and the height of the soil column barrel 5 can be reasonably matched according to the test requirements.
(3) The bottom of the soil column cylinder 5 is provided with a porous plate, and coarse sand with the height of 50mm is filled below the porous plate to be used as a filter layer 10.
(4) The test stand 1 is a device for fixing the soil column 5, a loading rod 11 for vertical loading and a starting actuator 12.
(5) The test bed 22 can adjust the distance from the top surface of the earth pillar and adjust the water head height of the Mariotte bottle 18.
(6) The loading device pressure is provided by a gas source, and the application of gas pressure controls the starting actuator 12 and the loading rod 11 to move up and down. The stroke distance of the pneumatic actuator 12 is 50mm, namely the maximum extension distance of the loading rod 11 is 50 mm.
(7) The maximum measuring range of the displacement sensor 13 is 100mm, and the precision is 0.25 percent of the full measuring range.
(8) The moisture sensor 9 is MP406-B type, the measuring range is 0-100%, the precision is +/-1%, the diameter of an installed through hole is 40mm, and the moisture sensor can be installed on the side surface of the soil column cylinder 5.
(9) The high-range suction sensor 8 is a miniature probe resistance type, the measuring range is 0-500kPa, the precision is 1kPa, the installed perforation diameter is 6mm, and the high-range suction sensor can be installed on the side surface of the soil column casing 5.
(10) The Mariotte bottle 18 has a cross-sectional area of 50 x 60mm2And the height is 500mm, and a stable water source is provided for test requirements.
(11) The electronic scale 16 is a model WT50002CF, weighing 5000g at the maximum, 0.01g at the actual division value, 0.5g at the minimum and 0.1g at the verification division value.
(12) The test bench 1 is 80cm long, 60cm wide, 6cm thick iron stand platform, and the rod frame 2 is the column iron pole of 180cm height area screw thread, and the screw thread can make the test bench 3 reciprocate through flange 4.
(13) The gasket 7 is a rubber ring with the inner diameter of 15cm, the outer diameter of 16cm and the thickness of 3 mm.
(14) The piston 19 is a threaded "T" twist piston.
(15) The rubber stopper 20 is a circular table with a lower diameter of 1cm, an upper diameter of 1.3cm and a height of 2 cm.
(16) 14 specification and model of the vibration table: SZ/ZD-XC, frequency range (0.01 Hz): 1 Hz-600 Hz; amplitude: 0-5 mm; maximum acceleration: 20g of the total weight of the mixture; time control: any time can be set (in seconds); power supply voltage (V): 220 plus or minus 20 percent; maximum current (a): 5; vibration direction: vertically; power: 1 Kw.
(17) The computer acquisition system 23 is respectively connected with the suction sensor 8, the moisture sensor 9 and the displacement sensor 13, and simultaneously measures the suction, the moisture content and the displacement value of different positions in the earth pillar under vibration at a certain moment to establish the relation among the suction, the moisture content and the displacement.
When in work, the method comprises the following steps:
(1) grinding loess, sieving with 2mm sieve, measuring water content, preparing into water content required by test by spraying method, stirring, sealing in plastic bag for 48 hr to make water content uniform, and re-measuring while controlling water content to + -0.2.
(2) In the preparation process of the soil column sample, in order to enable the sample to be compact and uniform, layered compaction is adopted, the total height of a test soil layer is 350mm, the compaction is carried out in 7 layers, the compaction height of each layer is 50mm, and the compaction degree is controlled by volume deformation.
(3) The outer surface of the soil column cylinder 5 is provided with a tape adhered with an adhesive tape, the prepared soil sample is uniformly spread in the soil column, an air source is opened, the vertical pressure is slowly applied by utilizing the air pressure, and the soil column cylinder stops immediately after the axial height reaches the compaction height.
(4) In order to make each layer of soil sample well contact, each layer is subjected to roughening treatment after being compacted and before being compacted, and finally, soil column samples with the height of 350mm, the diameter of 150mm, the test water content and the dry density are manufactured.
(5) After the sample is prepared, the sample is placed on the test bed 1, the loading rod 11 is put down to be tightly attached to the upper surface layer of the sample, and the displacement sensor 13 is connected.
(6) The vibration control table 15 is started to set different frequencies, different amplitudes and different times for testing.
(7) If the influence of running vehicle vibration on road settlement under the condition of simulating the water accumulation on the road surface is needed, the constant head can be controlled through the Mariotte bottle 18 during the test, the Mariotte bottle 18 is adjusted according to the height of the constant head according to the test requirement, and the steps (3) and (4) are repeated.
(8) And (5) if the constant head does not need to be controlled, namely a certain amount of water is added before the test is started, repeating the steps (3) and (4).
(9) In the test, the filter paper is laid on the upper layer and the lower layer respectively when the soil column is used for preparing the sample, so that the bottom soil is prevented from leaking from the porous plate and the upper soil layer is prevented from floating due to water inflow.
Through the mode, the roadbed settlement test device suitable for the vibration condition disclosed by the invention performs tests under different conditions by preparing samples with different water contents according to the water contents of the road soil sample under different environmental conditions; and the variable head of rainfall producing ponding of different depths and tests under constant head conditions can be simulated by the mahalanobis bottle 18. The test method adopted by the invention sets different vibration frequencies, vibration amplitudes and vibration holding times through the vibration control table 15, the water sensor 9, the high-range suction sensor 8, the displacement sensor 13, the computer acquisition system 23 and the like have various simulative engineering general profiles, the controllable variables of the test are more, the test measurement is detailed and accurate, and the method can be closer to the actual engineering general profile.
The device simulates the vehicle vibration load, the water content of roadbed soil and the settlement deformation caused by the infiltration of surface rainwater of the highway roadbed under the actual stress state, and through the experimental research of the device, the relationship between the settlement deformation of the roadbed and the vehicle load, the infiltration of rainwater and the distribution of the water content of the roadbed can be analyzed, so that guidance is provided for the design of the highway and the problem to be noticed during the maintenance of the pavement in the operation period, and further, the construction investment is saved and the service life of the highway is prolonged.
Claims (7)
1. Roadbed settlement test device suitable for vibration condition, a serial communication port, including test bench (1), upwards be equipped with shaking table (14) and earth pillar section of thick bamboo (5) in proper order on test bench (1), test bench (1) is put on the shelf and is equipped with test stand (3) that the top is located earth pillar section of thick bamboo (5) top, the top below of test stand (3) is equipped with starting actuator (12), the bottom of starting actuator (12) is connected with the load plate of sliding fit in earth pillar section of thick bamboo (5) through load pole (11), upper portion and lower part in earth pillar section of thick bamboo (5) respectively have a ma shi bottle (18) through the pipeline intercommunication.
2. The roadbed settlement test device applicable to the vibration condition according to claim 1, wherein the inner wall of the soil column casing (5) is provided with a suction sensor (8) and a moisture sensor (9).
3. The subgrade settlement test device suitable for the vibrating condition according to claim 1, characterized in that a displacement sensor (13) connected to the outer wall of the loading rod (11) is arranged below the top end of the test frame (3) and at a position on one side of the starting actuator (12).
4. The subgrade settlement test device suitable for the vibration condition as claimed in claim 1, characterized in that the bottom of the soil column casing (5) is laid with a filter layer (10) with the top end not lower than the position where the lower part of the soil column casing (5) is communicated with the Ma-shi bottle (18).
5. The roadbed settlement test device suitable for the vibration condition is characterized in that a rubber plug (20) is arranged at the top end of the Mariotte bottle (18), a piston (19) is arranged on the side wall of the Mariotte bottle (18), and an electronic scale (16) and a test bench (22) are sequentially arranged at the bottom of the Mariotte bottle (18) downwards.
6. The subgrade settlement test device suitable for the vibrating condition according to claim 1, characterized in that a vibrating console (15) is electrically connected to one side of the vibrating table (14).
7. The subgrade settlement test device suitable for the vibrating condition according to the claim 1, characterized in that the test frame (3) is erected on the test frame (1) through the rod frames (2) arranged at the two sides of the vibrating table (14) in parallel, and the connecting positions of the test frame (3) and the two rod frames (2) are provided with flanges (4).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210046309.9A CN114563288A (en) | 2022-01-14 | 2022-01-14 | Roadbed settlement test device suitable for vibration condition |
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| CN202210046309.9A CN114563288A (en) | 2022-01-14 | 2022-01-14 | Roadbed settlement test device suitable for vibration condition |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115950614A (en) * | 2023-03-14 | 2023-04-11 | 中国电建集团西北勘测设计研究院有限公司 | Vibration environment simulation device for construction of livable good industry and rural areas |
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|---|---|---|---|---|
| CN115950614A (en) * | 2023-03-14 | 2023-04-11 | 中国电建集团西北勘测设计研究院有限公司 | Vibration environment simulation device for construction of livable good industry and rural areas |
| CN115950614B (en) * | 2023-03-14 | 2023-06-13 | 中国电建集团西北勘测设计研究院有限公司 | Vibration environment simulation device |
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