CN112924081B - Dynamic water pressure field test system and method for controlling depth of surface accumulated water - Google Patents
Dynamic water pressure field test system and method for controlling depth of surface accumulated water Download PDFInfo
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- CN112924081B CN112924081B CN202110114494.6A CN202110114494A CN112924081B CN 112924081 B CN112924081 B CN 112924081B CN 202110114494 A CN202110114494 A CN 202110114494A CN 112924081 B CN112924081 B CN 112924081B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/08—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness for measuring thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/007—Subject matter not provided for in other groups of this subclass by applying a load, e.g. for resistance or wear testing
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Abstract
The invention provides a dynamic water pressure field test system and method for controlling the depth of surface accumulated water, and belongs to the technical field of road engineering pavement structure response field monitoring. The system comprises a full-scale loop, a loading vehicle and a ponding test area, the ponding test area is set based on the full-scale loop acceleration loading system to carry out the hydrodynamic pressure test, the position of a wheel track of a vehicle tire can be effectively controlled, the time interval that the loading vehicle periodically drives through the test area and the ponding depth of the test area are controlled by adopting a gate form, water can be rapidly supplemented and the ponding depth can be stably controlled, and therefore the accuracy of the monitored hydrodynamic pressure data is ensured.
Description
Technical Field
The invention relates to the technical field of road engineering pavement structure response field monitoring, in particular to a hydrodynamic pressure field testing system and method for controlling the depth of surface accumulated water.
Background
When the vehicle runs on the asphalt pavement with accumulated water on the surface, the extrusion and suction processes of the tire to liquid water can cause the inside of the pavement structure to form a positive and negative alternative hydrodynamic pressure service environment, which can aggravate the adverse effect of the whole stress of the pavement structure. The method has the advantages that the dynamic water pressure generated by the vehicle tire acting on the asphalt pavement is accurately measured, and the method has important significance for quantitatively evaluating the dynamic response characteristic of a saturated pavement structure and optimizing the design of the asphalt pavement.
The road surface water depth directly affects the magnitude of the hydrodynamic pressure generated. Therefore, the method can accurately control the depth of the accumulated water on the surface of the road, and is a premise for carrying out a field test to accurately obtain the hydrodynamic pressure data. The method is limited by test cost, most of the existing relevant research focuses on numerical simulation analysis, and few field test researches on saturated pavements also often have certain problems, which are specifically shown in the following two aspects: (1) in the existing research, an actual vehicle is mostly adopted for loading, and the running track of the vehicle is influenced by the subjective control of a driver, so that the relative positions of the contact between the tire and the water pressure sensor cannot be always kept consistent; (2) when the vehicle tire drives through the test area, a large amount of water is often taken away, if the test area is not timely supplemented with water or the total water supplement amount cannot be controlled, the difference of the depth of the accumulated water during the monitoring of the hydrodynamic pressure at each time can be caused. The two problems can influence the accuracy of the monitored hydrodynamic pressure data, if the data are not paid attention and solved, the reliability of relevant researches on a dynamic response field test of a saturated asphalt pavement structure can be influenced, the wrong estimation of the structure response characteristic is caused, and the pavement design is influenced.
Therefore, in order to more accurately monitor the hydrodynamic pressure generated by the vehicle tire acting on the asphalt pavement, a test method based on the fixed running track of the loaded vehicle and the accurate control of the road surface water depth is needed to be developed.
Disclosure of Invention
The invention aims to provide a dynamic water pressure field test system and a dynamic water pressure field test method for controlling the depth of accumulated water on a pavement, which can monitor the dynamic water pressure of an asphalt pavement caused by vehicle tires more conveniently and more accurately and evaluate the dynamic response characteristic of a saturated pavement structure.
The system comprises a full-scale loop, a loading vehicle and a water accumulation test area, wherein the full-scale loop is composed of a straight line section and an arc line section, the loading vehicle runs on an asphalt pavement of the full-scale loop along a fixed track, the water accumulation test area is arranged on the straight line section of the full-scale loop, the loading vehicle passes through the water accumulation test area along the clockwise direction according to a preset axial load, the water accumulation test area is formed by enclosing a baffle and a gate on the straight line section of the full-scale loop, a short baffle is arranged in the middle of a wheel track belt of the loading vehicle, a water injection pipeline is arranged at the long baffle along the driving direction, a drainage ditch is arranged on the ground at the gate, and a water film thickness sensor and a water pressure sensor are uniformly distributed in the water accumulation test area.
The loading vehicle runs along fixed tracks on two sides of a full-scale loop, wheel tracks of wheels on the surface of a road are kept unchanged, and the loading vehicle passes through a ponding test area according to a certain period at a speed not exceeding 30km/h, wherein the period is more than or equal to 24 s.
The short baffle is transversely arranged along the direction perpendicular to the driving direction, the interval between the short baffle and the wheel track belt is 5cm, and water in the ponding test area is kept not to flow outwards as far as possible on the premise that the tires of the loaded vehicles can smoothly pass through.
The accumulated water depth of the accumulated water test area is controlled by adjusting the opening height of the gate, and water overflowing the gate flows away through a drainage ditch arranged on the ground.
Water film thickness sensors and water pressure sensors are arranged on the wheel track belt at equal intervals, and the water film thickness sensors are also arranged on the outer side of the wheel track belt to monitor the water flow field characteristics of the tire when the tire runs.
The method specifically comprises the following steps:
s1: adjusting the height of the gate to a preset accumulated water depth, continuously injecting water into the accumulated water test area through a water injection pipeline until the water continuously and slowly overflows the gate, and keeping injecting water to maintain the accumulated water depth;
s2: controlling a loading vehicle to drive through a ponding test area along a full-scale loop clockwise, extruding ponding on a wheel track belt to two sides by wheels, generating hydrodynamic pressure in a pavement structure, and acquiring data by a water film thickness sensor and a water pressure sensor which are embedded in the ground at the wheel track belt in advance;
s3: and rapidly supplementing water into the ponding test area through a water injection pipeline, and recovering the preset ponding depth in the test area in the waiting interval time period of the loading vehicle running in other areas of the full-scale loop to wait for the next test.
Wherein, the test of water accumulation in S1The planar size of the region is 1 × 1m2-6×6m2(ii) a The length of the gate is 0-1m, and the adjusting height is 0-10 cm.
In S2, the distance between the water film thickness sensor and the water pressure sensor embedded in advance in the ground at the track belt is 1 m.
The waiting interval period in S3 is 24S.
The technical scheme of the invention has the following beneficial effects:
(1) the invention sets a water accumulation test area based on a full-scale loop accelerated loading system to carry out the hydrodynamic pressure test, and can effectively control the position of a wheel track belt of a vehicle tire; the time interval that the loading vehicle periodically passes through the test area enables rapid water replenishing and stable control of the depth of the accumulated water, and accuracy of the monitored hydrodynamic pressure data is guaranteed.
(2) The invention adopts the form of the gate to control the depth of the accumulated water in the test area, and has simple operation and obvious effect.
(3) According to the invention, the water film thickness sensors are uniformly arranged in the water accumulation test area, so that the water flow field characteristics of the tire when running can be effectively monitored, and the test evaluation index is richer.
Drawings
FIG. 1 is an overall plan view of a testing system of the present invention;
FIG. 2 is an enlarged plan view of a water accumulation test area of the present invention;
FIG. 3 is an elevation view of a water test area according to the present invention.
Wherein: 1-full-scale loop, 2-loading vehicle, 3-ponding test area, 4-baffle, 5-gate, 6-water injection pipeline, 7-drainage ditch, 8-wheel track belt, 9-water film thickness sensor, 10-water pressure sensor and 11-ground.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides a dynamic water pressure field test system and method for controlling the depth of surface accumulated water.
As shown in fig. 1, the system comprises a full-scale loop 1, a loading vehicle 2 and a water accumulation test area 3, wherein the full-scale loop 1 is composed of a straight line section and an arc line section, the loading vehicle 2 runs on an asphalt pavement of the full-scale loop 1 along a fixed track, the water accumulation test area 3 is arranged on the straight line section of the full-scale loop 1, the loading vehicle 2 passes through the water accumulation test area 3 along a clockwise direction according to a preset axial load and speed, as shown in fig. 2, the water accumulation test area 3 is formed by enclosing a baffle 4 and a gate 5 on the straight line section of the full-scale loop 1, a short baffle is arranged in the middle of a wheel track belt 8 of the loading vehicle 2, a water injection pipeline 6 is arranged at the long baffle along the running direction, a drainage ditch 7 is arranged on the ground at the gate 5, and a thickness sensor 9 and a water pressure sensor 10 are uniformly distributed in the water film in the water accumulation test area 3.
The loading vehicle 2 runs along the fixed tracks at two sides of the full-scale loop 1, the wheel track 8 of the wheel on the road surface is kept unchanged, and the loading vehicle 2 periodically passes through the ponding test area 3 at a certain speed; generally, the vehicle speed does not exceed 30km/h and the period is not less than 24s
The short baffle is transversely set up along with driving direction looks vertically, and short baffle only sets up to 5cm with 8 intervals of wheel track, is guaranteeing to keep the water in the ponding test area not outflow as far as possible under the prerequisite that the tire of loading vehicle 2 can pass through smoothly.
As shown in fig. 3, the depth of the ponding test area 3 is controlled by adjusting the opening height of the gate 5, and the water overflowing the gate 5 flows away through the drainage ditch 7 provided on the ground 11.
Water film thickness sensors 9 and water pressure sensors 10 are arranged on the wheel track belt 8 at equal intervals, and meanwhile, the water film thickness sensors 9 are also arranged on the outer side of the wheel track belt 8 to monitor the water flow field characteristics when the tire runs.
In the specific implementation process, the hydrodynamic pressure monitoring process for accurately controlling the depth of the accumulated water by adopting the test system provided by the invention comprises the following steps:
(1) adjusting the height of the gate 5 to a preset water accumulation depth, continuously injecting water into the water accumulation test area 3 through a water injection pipeline 6 until the water continuously and slowly flows through the gate 5, and keeping water injection to maintain the water accumulation depth;
(2) controlling a loading vehicle 2 to drive through a water accumulation test area 3 along a full-scale loop 1 in a clockwise direction, extruding accumulated water on a wheel track belt 8 to two sides by wheels, generating hydrodynamic pressure in a pavement structure, and acquiring data by a water film thickness sensor 9 and a water pressure sensor 10 which are embedded in the ground 11 at the wheel track belt 8 in advance;
(3) through water injection pipeline 6 to moisturizing fast in ponding test region 3, utilize loading vehicle 2 in the waiting interval time section of other regional traveles of full-scale ring 1, resume the predetermined ponding degree of depth in test region 3, wait for the test next time.
According to the mode, the invention can be better realized, the ponding test area is arranged based on the full-scale circular acceleration loading system to carry out the hydrodynamic pressure test, the position of the wheel track of the vehicle tire can be effectively controlled, the waiting time interval of the loading vehicle periodically driving through the test area and the ponding depth of the test area are controlled by adopting a gate form, the ponding depth can be rapidly supplemented and stably controlled, and the accuracy of the monitored hydrodynamic pressure data is ensured.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. The utility model provides a control running water pressure field test system of surface gathered water degree of depth which characterized in that: the system comprises a full-scale loop (1), a loading vehicle (2) and a water accumulation test area (3), wherein the full-scale loop (1) consists of a straight line section and an arc section, the loading vehicle (2) runs on an asphalt pavement of the full-scale loop (1) along a fixed track, the water accumulation test area (3) is arranged on the straight line section of the full-scale loop (1), the loading vehicle (2) passes through the water accumulation test area (3) along the clockwise direction according to preset axle load and speed, the water accumulation test area (3) is formed by enclosing a baffle (4) and a gate (5) on the straight line section of the full-scale loop (1), wherein a short baffle is arranged in the middle of a wheel track belt (8) of the loading vehicle (2), a water injection pipeline (6) is arranged at the long baffle along the driving direction, a drainage ditch (7) is arranged on the ground at the gate (5), and a water film thickness sensor (9) and a water pressure sensor (10) are uniformly distributed in the ponding test area (3);
the loading vehicle (2) runs along fixed tracks on two sides of the full-scale circular road (1), wheel tracks (8) of wheels on the road surface are kept unchanged, and the loading vehicle (2) penetrates through the ponding test area (3) at a speed of not more than 30km/h according to a certain period, wherein the period is more than or equal to 24 s;
the accumulated water depth of the accumulated water test area (3) is controlled by adjusting the opening height of the gate (5), and water overflowing the gate (5) flows away through a drainage ditch (7) arranged on the ground (11);
the wheel track belt (8) is provided with water film thickness sensors (9) and water pressure sensors (10) at equal intervals, and the water film thickness sensors (9) are arranged on the outer side of the wheel track belt (8) to monitor the water flow field characteristics of the tire when the tire runs.
2. The hydrodynamic pressure field test system for controlling the depth of surface water according to claim 1, characterized in that: the short baffle is transversely arranged along the direction vertical to the driving direction, and the distance between the short baffle and the wheel track belt (8) is 5 cm.
3. The method for applying the hydrodynamic pressure field test system for controlling the depth of the surface water of the road surface according to claim 1, which is characterized in that: the method comprises the following steps:
s1: adjusting the height of the gate (5) to a preset water accumulation depth, continuously injecting water into the water accumulation test area (3) through a water injection pipeline (6) until the water continuously and slowly overflows the gate (5), and keeping water injection to maintain the water accumulation depth;
s2: controlling a loading vehicle (2) to drive through a ponding test area (3) along a full-scale loop (1) in a clockwise direction, extruding ponding on a wheel track belt (8) to two sides by wheels and generating hydrodynamic pressure in a pavement structure, and acquiring data by a water film thickness sensor (9) and a water pressure sensor (10) which are embedded in the ground at the wheel track belt (8) in advance;
s3: rapidly supplementing water into the ponding test area (3) through the water injection pipeline (6), and recovering the preset ponding depth in the test area to wait for the next test in the waiting interval time period of the loading vehicle (2) running in other areas of the full-scale loop (1).
4. The method of claim 3, wherein: the plane size of the ponding test area (3) in the S1 is 1 multiplied by 1m2-6×6m2(ii) a The length of the gate (5) is 0-1m, and the adjusting height is 0-10 cm.
5. The method of claim 3, wherein: in the S2, the distance between a water film thickness sensor (9) and a water pressure sensor (10) which are embedded in the ground at the wheel track belt (8) in advance is 1 m.
6. The method of claim 3, wherein: the waiting interval period in S3 is 24S.
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