CN113063683A - Road surface structure service behavior contrast test method based on accelerated loading test - Google Patents
Road surface structure service behavior contrast test method based on accelerated loading test Download PDFInfo
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Abstract
The invention provides a road surface structure service behavior comparison test method based on an accelerated loading test, and belongs to the technical field of road surface accelerated loading. The method comprises the steps of determining the loading condition of a straight-road acceleration loading device, determining the loading condition of a loop-road acceleration loading device, comparing the service behaviors of the road surface structures under two experimental devices, and comparing an indoor test with a full-scale road surface test. The invention provides a contrast test method of a straight road acceleration loading device and a loop road acceleration loading device, which can improve the correlation between an acceleration loading test and the structural service behavior of a real road surface and improve the reliability of the acceleration loading test by comparing the structural service behaviors of the road surfaces under the two devices, can analyze the influence of a size effect and boundary conditions on the acceleration loading test of an asphalt road surface by comparing an indoor track test with a full-scale road surface test, and can establish the relation between the indoor test and the full-scale road surface test.
Description
Technical Field
The invention relates to the technical field of accelerated loading of pavements, in particular to a pavement structure service behavior comparison test method based on an accelerated loading test.
Background
In the present day of rapid development of economic technology, the construction of infrastructure is also an extremely important part. China invests a large amount of funds on road traffic every year and is used for road construction and maintenance. The related research of the damage mechanism and the solution of the pavement is particularly important.
The existing road surface correlation research method mainly comprises computer simulation, model test, laboratory test, real road surface test, full-scale road surface acceleration loading test and the like, wherein the results obtained by the computer simulation, the model test and the laboratory test are different from the service behavior of the real road surface. The real pavement test is consistent with the service behavior of the pavement, but the test period is long and the required expenditure is high. The service behavior of the full-scale pavement accelerated loading test is different from that of a real pavement, but the full-scale pavement accelerated loading test has short period and low cost and is a method with higher cost performance.
In order to improve the correlation between the full-scale pavement accelerated loading test and the structure service behavior of a real pavement, the invention provides a pavement structure service behavior comparison test method based on the accelerated loading test.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a road surface structure service behavior comparison test method based on an accelerated loading test, and by utilizing comparison of the road surface structure service behaviors under two devices, the correlation between the accelerated loading test and the real road surface structure service behavior can be improved, and the reliability of the accelerated loading test is improved.
The device used in the method comprises a loop accelerating loading device, a loop accelerating loading road surface, a straight road accelerating loading device and a straight road accelerating loading road surface, and the specific experimental method comprises the steps of determining the loading working condition of the straight road accelerating loading device, determining the loading working condition of the loop accelerating loading device, comparing the service behaviors of the road surface structures under two experimental devices, and comparing an indoor test with a full-scale road surface test.
The method specifically comprises the following steps:
s1: under the conditions of 5t of axle load, 20km/H of speed and natural environment temperature, a road surface is loaded for 10 ten thousand times by using a straight road acceleration loading device, a loop road acceleration loading device and a rut instrument, the rut instrument performs an indoor road material rut test according to a road engineering asphalt and asphalt mixture test procedure, the depth H and the width L of a road rut are measured every 1 ten thousand times, the relation between the depth H and the loading times is drawn, the shape and the position relation of a rut depth curve in a relation graph are compared, and the relation of road rut forming speed in three loading modes is compared; calculating the ratio of depth to width of the rut after 10 ten thousand times of loading, namely A1, A2 and A3, wherein A1 is a result measured by a straight track acceleration loading device, A2 is a result measured by a loop acceleration loading device, and A3 is a result measured by a rut meter; comparing the relationship between A1 of a straight road under the constraint of a concrete wall boundary and A2 of a circular road under the non-boundary constraint, comparing the influence of the boundary on the accelerated loading of an asphalt road to form a track, and comparing the influence of a size effect on the accelerated loading of an indoor track test and a full-scale road to form a track by comparing the relationship between A2 of the circular road and A3 of a track instrument;
s2: under the condition that the axle load is 5t, the speed is 20km/h, the temperature, the rainfall and the illumination are all natural environment conditions, the straight-way acceleration loading device runs for 5min under the working condition that the frequency is 1Hz and the loop acceleration loading device runs under the working condition that the frequency is 0.025Hz, the transverse, vertical and longitudinal strain data of the road surface are obtained, and the difference of the service behaviors of the road surface under the conditions of straight-way high-frequency loading and loop low-frequency loading is compared by comparing the difference of the peak value size, the peak shape and the periodicity of the three-way strain data;
s3: under the condition that the axle load is 5t, the speed is 20km/h, the rainfall and the illumination are natural environment conditions, the straight-way acceleration loading device operates for 5min under the working condition of the natural atmospheric temperature at-15 ℃, 0 ℃, 15 ℃, 30 ℃, 45 ℃ and 60 ℃ respectively to obtain the transverse, vertical and longitudinal three-way strain data of the road surface, and the difference of the service behaviors of the road surface under the conditions of the straight-way temperature control loading and the natural atmospheric temperature of the road surface is compared by comparing the peak value size, the peak shape and the periodicity of the three-way strain data;
s4: under the condition that the axle load is 5t, the speed is 20km/h, the temperature and the illumination are natural environment conditions, the straight-way acceleration loading device sprays precipitation under two precipitation intensities of 10mm/h and 20mm/h, the loop acceleration loading device runs for 5min under the working condition of natural rainfall to obtain three-way strain data of the horizontal direction, the vertical direction and the longitudinal direction of the road surface, and the difference of the service behaviors of the road surface under the conditions of straight-way spraying rainfall loading and loop natural rainfall is compared by comparing the difference of the peak value size, the peak shape and the periodicity of the three-way strain data;
s5: under the conditions of axle load of 5t, speed of 20km/h, temperature and rainfall which are natural environment conditions, the straight-track acceleration loading device is 200W/m2、400W/m2The ultraviolet lamp illumination and loop acceleration loading device operates for 5min under the working condition of solar illumination under two illumination intensities to obtain the transverse, vertical and longitudinal three-dimensional strain data of the road surface, and the service behavior of the road surface under the conditions of straight ultraviolet illumination and loop solar illumination is compared by comparing the peak value size, the peak shape and the periodic difference of the three-dimensional strain data.
The straight-way acceleration loading device is circularly loaded by 6 groups of half shafts 2, and the controllable test conditions during the straight-way acceleration loading test are as follows: axial load, speed, temperature, spray precipitation and ultraviolet illumination.
The loop accelerating loading device is loaded by the combination of a single shaft 4 wheels and a double coupling 8 wheels, and the controllable test conditions when the loop accelerating loading test are carried out are as follows: axle load, speed.
A three-way strain sensor and a temperature sensor are embedded in the straight accelerated loading road surface to provide service behavior data of the road surface during loading.
A three-way strain sensor and a temperature sensor are embedded in the accelerated loading pavement of the loop, and service behavior data of the pavement during loading are provided.
The technical scheme of the invention has the following beneficial effects:
(1) the invention provides a contrast test method for a straight-road acceleration loading device and a loop-road acceleration loading device, which can improve the correlation between an acceleration loading test and the structural service behavior of a real road surface and improve the reliability of the acceleration loading test by comparing the structural service behaviors of the road surface under the two devices.
(2) The invention provides a comparison test method of a straight-road acceleration loading device and a loop-road acceleration loading device, which can obtain the influence degree of different factors on the service performance of a pavement by comparing data of pavement sensors under different test conditions, so that the data under the working condition of an acceleration loading test can be used for evaluating the service performance of pavement materials.
(3) The invention provides a contrast test method of an indoor test and a full-scale pavement test, which can analyze the influence of a size effect and boundary conditions on an accelerated loading test of an asphalt pavement and establish the relation between the indoor rutting test and the full-scale pavement test by utilizing the contrast of the indoor rutting test and the full-scale pavement test.
Drawings
FIG. 1 is a schematic view of an accelerated loading apparatus used in the present invention;
FIG. 2 is a schematic view of a loop accelerated loading test cart used in the present invention;
FIG. 3 is a schematic view of a straight accelerated loading endless chain for use in the present invention;
FIG. 4 is a flow chart of a comparative testing method of the present invention;
FIG. 5 is a graph of rut depth H versus loading times in accordance with the present invention;
FIG. 6 is a graph of straight-track longitudinal strain data in accordance with the present invention.
Wherein: the system comprises a 1-loop accelerated loading device, a 2-loop accelerated loading road surface, a 3-straight accelerated loading device and a 4-straight accelerated loading road surface.
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 road surface structure service behavior comparison test method based on an accelerated loading test.
As shown in figure 1, the device used in the method comprises a loop accelerating loading device 1, a loop accelerating loading road surface 2, a straight accelerating loading device 3 and a straight accelerating loading road surface 4, and the method comprises the steps of determining the loading working condition of the straight accelerating loading device 3, determining the loading working condition of the loop accelerating loading device, comparing the service behaviors of the road surface structure under two experimental devices, and comparing an indoor test with a full-scale road surface test.
As shown in fig. 3, the straight-road acceleration loading device 3 is cyclically loaded by 6 groups of half shafts 2, and the controlled test conditions are as follows: axial load, speed, temperature, spray precipitation and ultraviolet illumination.
As shown in fig. 2, the loop accelerating and loading device is loaded by a single shaft 4 wheels and a double coupling 8 wheels in a combined manner, and the controlled test conditions are as follows: axle load, speed.
The sensor is embedded in the straight accelerated loading road surface 4 to provide service behavior data of the road surface during loading.
A sensor is embedded in the loop accelerated loading pavement 2 to provide service behavior data of the pavement during loading.
As shown in fig. 4, the present invention specifically includes the following steps:
step one, under the conditions of 5t axle load, 20km/H speed and natural environment temperature, a straight track acceleration loading device, a loop track acceleration loading device and a rutting instrument are used for loading 10 ten thousand times on a road surface, the rutting instrument is used for carrying out an indoor road material rutting test according to a road engineering asphalt and asphalt mixture test regulation, the depth H and the width L of a road rutting are measured every 1 ten thousand times, a relation graph of the depth H and the loading times is drawn, as shown in figure 5, the shape and the position relation of a curve of the rutting depth in the graph are compared, if the three curve shapes are similar, the three loading modes have no influence on the forming process of the road rutting, the speed of the road rutting formation under the three loading modes is analyzed from the position relation of the three curves, if the three curves are shown according to the positions in figure 5, the rutting forming speed of the straight track under the double half axle and the double half axle condition is smaller than the rutting forming speed of the loop under the double axle and 8 wheel condition, the rut formation rate of the indoor rut meter sample is minimal. The ratio of the depth to the width of the rut after 10 ten thousand times of loading, A1, A2 and A3, is calculated by the following formula:
depth-width ratio of ruts on straight road A1H 1/L1 (1)
Road rut depth-width ratio of loading road ring A2H 2/L2 (2)
Rut instrument sample depth-width ratio A3 ═ H3/L3 (3)
Relative difference of depth-width ratio of straight track and circular track
Relative difference between depth-width ratio of rut instrument sample and ring track rut
Comparing A1 with A2 to determine if eta12If the ratio is more than 20 percent, the boundary condition of the concrete wall of the straight road has obvious barrier effect on the road surface during the track forming, and if the ratio is more than 10 percent and less than eta12Less than or equal to 20 percent, the boundary condition of the concrete wall of the straight road has certain hindering effect on the formation of the track on the road surface, if eta is12The concrete wall boundary condition of the straight road has no obvious obstruction effect on the road surface when the track is formed; comparing A3 with A2 to determine if eta32If the ratio is more than 20%, the small-size test sample of the rut meter is influenced by the size effect when the rut is formed, and if the ratio is more than 10% < eta32Less than or equal to 20 percent, the influence of the size factor of the small-size sample of the rut instrument on the rut forming is small, if eta is32The proportion is less than or equal to 10 percent, which indicates that the small-size test sample of the rut meter is not influenced by the size effect when the rut is formed;
step two, under the condition that the axle load is 5t, the speed is 20km/h, the temperature, the rainfall and the illumination are natural environmental conditions, the straight road acceleration loading device runs for 5min under the working condition that the frequency is 1Hz and the loop road acceleration loading device runs under the working condition that the frequency is 0.025Hz, the transverse, vertical and longitudinal strain data of the road surface are obtained, the straight road longitudinal strain data shown in figure 6 is taken as an example, 6 continuous peak values b1, b2, b3, b4, b5 and b6 in the figure are taken, the average value is calculated to be used as the straight road longitudinal strain peak value ZB1,
straight longitudinal strain peak: ZB1 ═ b1+ b2+ b3+ b4+ b5+ b6)/6 (6)
The method comprises the steps of obtaining a straight-track transverse strain peak XB1, a vertical strain peak YB1, an annular-track transverse strain peak XB2, a vertical strain peak YB2 and a longitudinal strain peak ZB2 (the same below) by calculation through the same method, comparing the peak values of three-way strain data of a straight-track loaded road surface and an annular-track loaded road surface, if the three-way strain peak of the straight-track loaded road surface is larger than the three-way strain peak of the annular-track loaded road surface, indicating that the road surface is seriously damaged under the high-frequency loading condition, and if the three-way strain peak of the straight-track loaded road surface is close to the three-way strain peak of the annular-track loaded road surface, indicating that the loading frequency has little;
thirdly, when the axle load is 5t, the speed is 20km/h, the rainfall and the illumination are natural environment conditions, the straight-way acceleration loading device operates for 5min under the working conditions of-15 ℃, 0 ℃, 15 ℃, 30 ℃, 45 ℃ and 60 ℃ and the loop acceleration loading device operates at the natural atmospheric temperature respectively to obtain the transverse, vertical and longitudinal strain data of the road surface, and the comparison result shows that under the working condition of-15 ℃, the three-way strain peak XB1 of the straight-way road surface is obtained-15、YB1-15、ZB1-15The sizes and the wave crest shapes of three-way strain peak values XB2, YB2 and ZB2 of the loop loading road surface indicate that the low-temperature condition has an inhibiting effect on the stress recovery process of the road surface if the peak values are close and the straight road wave crest shapes are wider; comparing the three-dimensional strain peak XB1 of a straight road loaded road surface under the working condition of 60 DEG C60、YB160、ZB160The sizes and the wave crest shapes of the three-way strain peak values XB2, YB2 and ZB2 of the loading road surface of the circular road indicate that the road surface is more seriously damaged under the high-temperature condition if the peak value of the straight road surface is larger and the wave crest shapes are the same; selecting a group of three-dimensional strain peak values of the straight loading road surface with the maximum three-dimensional strain peak values in six working conditions of-15 ℃, 0 ℃, 15 ℃, 30 ℃, 45 ℃ and 60 ℃, and calculating etaX12、ηY12、ηZ12，
Relative difference between transverse strain peaks of straight track and circular track
Relative difference between vertical strain peak values of straight road and circular road
Relative difference between longitudinal strain peaks of straight track and circular track
If the values of eta X12, eta Y12 and eta Z12 in the temperature working condition are more than 20%, the temperature factor has a large influence on the service behavior of the road surface, and if the values of eta X12, eta Y12 and eta Z12 in the temperature working condition are all less than 20%, the temperature factor has a small influence on the service behavior of the road surface;
step four, under the conditions of axle load of 5t, speed of 20km/h, temperature and illumination which are natural environment conditions, spraying precipitation under the two precipitation intensities of 10mm/h and 20mm/h by the straight-track acceleration loading device, running for 5min under the working condition of natural precipitation by the loop acceleration loading device, acquiring the transverse, vertical and longitudinal strain data of the road surface, comparing the three-dimensional strain data XB1 ', YB 1', ZB1 'of the straight-track acceleration loading device under the working condition of 10mm/h precipitation intensity with the three-dimensional strain data XB 1', YB1 ', ZB 1' of the straight-track acceleration loading device under the working condition of 20mm/h precipitation intensity, calculating delta X, delta Y and delta Z,
relative difference of transverse strain peak values of two kinds of rainfall intensity of straight road
Vertical strain peak relative difference of two kinds of rainfall intensity of straight road
Vertical strain peak relative difference of two kinds of rainfall intensity of straight road
If the numerical value of delta X, delta Y and delta Z is more than 20 percent, the influence of the precipitation on the service behavior of the road surface is obvious, and if the numerical value of delta X, delta Y and delta Z is more than 20 percent, the influence of the precipitation on the service behavior of the road surface is obviousIf the numerical values are all less than 20%, the precipitation has no obvious influence on the service behavior of the pavement; comparing the three-way strain data XB1 ', YB1 ' and ZB1 ' of the straight road under the working condition of 10 rainfall intensity with the three-way strain data XB2, YB2 and ZB2 of the loop natural rainfall, if the numerical value difference is large and the peak shape and periodicity are obviously different, the service behavior of the straight road under the conditions of straight spraying rainfall and loop natural rainfall is greatly different, and if the numerical value difference is small and the peak shape and periodicity are similar, the service behavior of the straight road under the conditions of straight spraying rainfall and loop natural rainfall is smaller;
step five, under the conditions of axle load of 5t, speed of 20km/h, temperature and rainfall which are natural environment conditions, the straight-way acceleration loading device is 200W/m2、400W/m2Operating the ultraviolet lamp illumination and loop acceleration loading device for 5min under the working condition of solar illumination under two illumination intensities to obtain the transverse, vertical and longitudinal strain data of the road surface, and comparing the transverse acceleration loading device with the straight acceleration loading device at 200W/m2、400W/m2Three-dimensional strain data XB1 under two illumination intensity working conditions200、YB1200、ZB1200And XB1400、YB1400、ZB1400Calculating a tangle-solidup X, a tangle-solidup Y and a tangle-solidup Z,
relative difference of transverse strain peak values of two illumination intensities of straight track
Relative difference of vertical strain peak values of two kinds of illumination intensity of straight road
Relative difference of longitudinal strain peak values of two kinds of illumination intensity of straight track
If the numerical value of the A-X, the A-Y and the A-Z is more than 20 percent, the illumination intensity has obvious influence on the service behavior of the pavement, and if the numerical value of the A-X, the A-Y and the A-Z is less than 20 percentThe illumination intensity has no obvious influence on the service behavior of the pavement; compared with the straight road surface at 200W/m2Three-dimensional strain data XB1 under illumination intensity working condition200、YB1200、ZB1200The numerical values of the three-dimensional strain XB2, YB2 and ZB2 under the working condition of the circular track solar illumination are different from those of the three-dimensional strain XB2, YB2 and ZB2 under the working condition of the circular track solar illumination, if the numerical value difference is large and the shape and periodicity of the wave peak are obviously different from each other, the service behavior of the road surface under the conditions of the straight track ultraviolet illumination and the circular track solar illumination is different from each other greatly, and if the numerical value difference is small and the shape and periodicity of the wave peak are similar to each other, the service;
according to the invention, by comparing the test methods of the straight-track accelerated loading device and the loop accelerated loading device, not only are the influence factors of the service behavior of the road surface under the accelerated loading condition compared, but also the service behavior of the road surface under the two loading modes of loop accelerated loading and straight-track accelerated loading are compared, so that the data under the accelerated loading test working condition can be used for evaluating the service performance of the road surface material, and the reliability of the accelerated loading test is improved.
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. A road surface structure service behavior contrast test method based on an accelerated loading test is characterized in that: the method comprises the steps of utilizing a loop accelerating loading device (1), a loop accelerating loading road surface (2), a straight-way accelerating loading device (3) and a straight-way accelerating loading road surface (4), and realizing a contrast test through determining the loading working condition of the straight-way accelerating loading device (3), determining the loading working condition of the loop accelerating loading device, comparing the service behaviors of a road surface structure under two experimental devices and comparing an indoor test with a full-scale road surface test.
2. The method for testing the service behavior of the road surface structure based on the accelerated loading test according to claim 1, which is characterized in that: the method specifically comprises the following steps:
s1: under the conditions of 5t of axle load, 20km/H of speed and natural environment temperature, a road surface is loaded for 10 ten thousand times by using a straight road acceleration loading device, a loop road acceleration loading device and a rut instrument, the rut instrument performs an indoor road material rut test according to road engineering asphalt and asphalt mixture test procedures, the depth H and the width L of a road rut are measured every 1 ten thousand times, and the relation between the depth H and the loading times is drawn; calculating the ratio of depth to width of the rut after 10 ten thousand times of loading, namely A1, A2 and A3, wherein A1 is a result measured by a straight track acceleration loading device, A2 is a result measured by a loop acceleration loading device, and A3 is a result measured by a rut meter; comparing the relationship between A1 of a straight road under the constraint of a concrete wall boundary and A2 of a circular road under the non-boundary constraint, comparing the influence of the boundary on the accelerated loading of an asphalt road to form a track, and comparing the influence of a size effect on the accelerated loading of an indoor track test and a full-scale road to form a track by comparing the relationship between A2 of the circular road and A3 of a track instrument;
s2: under the condition that the axle load is 5t, the speed is 20km/h, the temperature, the rainfall and the illumination are all natural environment conditions, the straight-way acceleration loading device runs for 5min under the working condition that the frequency is 1Hz and the loop acceleration loading device runs under the working condition that the frequency is 0.025Hz, the transverse, vertical and longitudinal strain data of the road surface are obtained, and the difference of the service behaviors of the road surface under the conditions of straight-way high-frequency loading and loop low-frequency loading is compared by comparing the difference of the peak value size, the peak shape and the periodicity of the three-way strain data;
s3: under the condition that the axle load is 5t, the speed is 20km/h, the rainfall and the illumination are natural environment conditions, the straight-way acceleration loading device operates for 5min under the working condition of the natural atmospheric temperature at-15 ℃, 0 ℃, 15 ℃, 30 ℃, 45 ℃ and 60 ℃ respectively to obtain the transverse, vertical and longitudinal three-way strain data of the road surface, and the difference of the service behaviors of the road surface under the conditions of the straight-way temperature control loading and the natural atmospheric temperature of the road surface is compared by comparing the peak value size, the peak shape and the periodicity of the three-way strain data;
s4: under the condition that the axle load is 5t, the speed is 20km/h, the temperature and the illumination are natural environment conditions, the straight-way acceleration loading device sprays precipitation under two precipitation intensities of 10mm/h and 20mm/h, the loop acceleration loading device runs for 5min under the working condition of natural rainfall to obtain three-way strain data of the horizontal direction, the vertical direction and the longitudinal direction of the road surface, and the difference of the service behaviors of the road surface under the conditions of straight-way spraying rainfall loading and loop natural rainfall is compared by comparing the difference of the peak value size, the peak shape and the periodicity of the three-way strain data;
s5: under the conditions of axle load of 5t, speed of 20km/h, temperature and rainfall which are natural environment conditions, the straight-track acceleration loading device is 200W/m2、400W/m2The method comprises the steps of running an ultraviolet lamp illumination and loop acceleration loading device for 5min under the working condition of solar illumination under two illumination intensities to obtain transverse, vertical and longitudinal three-dimensional strain data of a road surface, and comparing the difference of the service behaviors of the road surface under the conditions of straight ultraviolet illumination and loop solar illumination by comparing the peak value size, the peak shape and the periodicity of the three-dimensional strain data.
3. The method for testing the service behavior of the road surface structure based on the accelerated loading test according to claim 1, which is characterized in that: the straight-path accelerated loading device (3) is circularly loaded by 6 groups of half shafts 2, and the test conditions controlled during the straight-path accelerated loading test comprise that: axial load, speed, temperature, spray precipitation and ultraviolet lamp illumination.
4. The method for testing the service behavior of the road surface structure based on the accelerated loading test according to claim 1, which is characterized in that: the loop accelerating loading device (1) is loaded by combining a single shaft with 4 wheels and a double-coupling shaft with 8 wheels, and the test conditions controlled during the loop accelerating loading test comprise: axle load, speed.
5. The method for testing the service behavior of the road surface structure based on the accelerated loading test according to claim 1, which is characterized in that: the vertical acceleration loading road surface (4) is embedded with a transverse, vertical and longitudinal three-way strain sensor and a temperature sensor to provide service behavior data of the road surface during loading, and the periphery of the vertical acceleration loading road surface (4) is provided with boundary constraint formed by concrete walls.
6. The method for testing the service behavior of the road surface structure based on the accelerated loading test according to claim 1, which is characterized in that: a three-dimensional strain sensor and a temperature sensor are embedded in the loop accelerated loading pavement (2) to provide service behavior data of the pavement during loading, and no boundary constraint formed by concrete walls exists around the loop accelerated loading pavement (2).
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