CN107478802B - A kind of pavement structure mechanical behavior experimental rig and test method - Google Patents

A kind of pavement structure mechanical behavior experimental rig and test method Download PDF

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Publication number
CN107478802B
CN107478802B CN201710487292.XA CN201710487292A CN107478802B CN 107478802 B CN107478802 B CN 107478802B CN 201710487292 A CN201710487292 A CN 201710487292A CN 107478802 B CN107478802 B CN 107478802B
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road
pavement
sample
mechanical behavior
oil cylinder
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CN107478802A (en
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董忠红
郭志勇
荣明达
吴学前
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Changan University
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Changan University
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/24Earth materials

Abstract

The present invention provides a kind of pavement structure mechanical behavior experimental rig and its test methods, bottom in insulated building is provided with pedestal, one group of column is provided on pedestal, the hoistable platform that can be gone up and down on column is installed on column, the telescopic oil cylinder for stretching out hoistable platform bottom is installed on hoistable platform, telescopic oil cylinder is vertically arranged with pedestal, and the bottom end of telescopic oil cylinder is provided with loading mechanism, is equipped with tire on loading mechanism;Tire positioning mechanism is installed on the column and telescopic oil cylinder;It is equipped with a pair of guide rails on pedestal below the tire, the roller box that can be moved along guide rail is installed on guide rail, support platform is installed on roller box top surface, the sample case for placing road surface sample is installed on support platform top surface.Restrained condition of the present invention since practical road surface road surface surrounding structure road pavement key damage field in a natural environment to the effect of contraction of crucial damage field, can be simulated to the maximum extent using steel construction simulated roadway surrounding structure.

Description

A kind of pavement structure mechanical behavior experimental rig and test method
Technical field
The invention belongs to pavement structure mechanics fields, are related to pavement structure mechanical behavior and long durability research, specifically It is related to a kind of pavement structure mechanical behavior experimental rig and test method.
Background technique
Highway transportation plays an important role in the national economic development.Make in the circulation of vehicular load and environmental load Under, damage accumulation occurs for pavement structure, and then generates various diseases, such as: crackle, track, these pavement diseases not only shadow Vehicle driving comfortableness and security are rung, reduce road service performance, and influence pavement structure service life.Therefore, it studies The mechanical behavior of pavement structure is particularly important under vehicular load and environmental load.
Currently used pavement structure mechanical behavior test method has small sample method and full scale test method.Common small sample Method mainly has cylindrical specimens Indirect Tensile Tests method, trapezoidal cantilever beam bend test method, rectangle girder four-point bending test method With three point bending test method.The advantages of small sample test method(s) be sample production is simple, the test period is short, it is at low cost, convenient for into The large batch of experimental study of row.Moreover, the influnecing factors such as the external influence factors such as load and temperature and mixture composition Can be precisely controlled, convenient for studying the affecting laws of different factor road pavement material mechanical performances.But these are tested Method absolutely not considers the effect of contraction from surface layer around and base that sample is subject to, and does not also account for tire and road surface The real bearing state on road surface when coupling, therefore, the mechanical state and failure mechanism of small sample and the difference of pavement structure Seriously, lead to test result and practical pavement structure use state grave fault.
In order to overcome many drawbacks of small sample test method(s), domestic and foreign scholars propose full scale test method.Main includes examination Test road test method(s), linear track test method and circular track test method.The advantage of full scale test method is the mechanical behavior of pavement structure sample With fitting like a glove under actual traffic load, but such test needs to build dedicated test site, using special-purpose vehicle as plus Load tool, the test period for needing to grow very much, this just needs to consume a large amount of manpower and material resources cost, and repeatability is also bad.And Two key factors --- load and temperature --- for influencing bituminous pavement fatigue behaviour are all difficult to accurately control, result of study tool There is significant limitation.Strictly, the research achievement of full scale test can only be used to evaluate weather conditions, traffic condition and road surface The pavement structure mechanical property in structure composition area similar with pilot project.
If it is possible to a kind of novel road surface structure mechanical test method is developed, it can either good simulation reality The mechanical behavior of pavement structure under the traffic loading of border, and temperature and load can be set and control, and test and expend few, the period It is short, it is convenient for bulge test research, then the assessment of Pavement Performance in Distress and ground surface material are set with pavement structure innovation Meter, is of great significance.
Summary of the invention
In view of the deficiencies of the prior art, the present invention intends to provide a kind of pavement structure mechanical behavior test Device and test method solve existing test method poor controllability, and it is big that manpower and material resources expend big and test result limitation The technical issues of.
In order to solve the above-mentioned technical problem, the present invention is realised by adopting the following technical scheme:
A kind of pavement structure mechanical behavior experimental rig, including insulated building, be equipped in insulated building temperature control system and Humidity control system, the bottom in insulated building are provided with pedestal, one group of column are provided with around pedestal, being equipped on column can The hoistable platform gone up and down on column, is equipped with the telescopic oil cylinder for stretching out hoistable platform bottom on hoistable platform, telescopic oil cylinder with Pedestal is vertically arranged, and the bottom end of telescopic oil cylinder is provided with loading mechanism, is equipped with tire on loading mechanism;
Tire positioning mechanism is installed, the tire positioning mechanism includes being mounted on the column and telescopic oil cylinder Column fastening connecting ring on column and the telescopic oil cylinder fastening connecting ring being mounted on telescopic oil cylinder, column fastening connecting ring and It is connected between telescopic oil cylinder fastening connecting ring by telescoping, tensioning bar;
It is equipped with a pair of guide rails on pedestal below the tire, the wheel that can be moved along guide rail is installed on guide rail Case is equipped with support platform on roller box top surface, the sample case for placing road surface sample is equipped on support platform top surface.
The present invention also has following distinguishing feature:
The hoistable platform is a pair of of hoistable platform disposed in parallel.
Limiter is provided on the guide rail.
Fastening bolt is provided on the column fastening connecting ring and telescopic oil cylinder fastening connecting ring.
The telescoping, tensioning bar includes the first female adapter for being fixedly arranged at column and being fastenedly connected on ring-side wall, in first Nipple is connected with first male connection of first steel pipe one end, and the first steel pipe other end is provided with the second external screw thread and connects Head, the second male connection are connected with second female adapter of second steel pipe one end, and the other end of the second steel pipe is provided with Three male connections, third male connection and the third female adapter phase for being fixedly arranged at telescopic oil cylinder and being fastenedly connected on ring-side wall Even.
The roller box includes wheel box body, takes turns and is equipped with the guide wheel that can be moved along guide rail in box body, on guide wheel Wheel shaft is installed, the either-rotation motor being also equipped on box body for controlling wheel shaft rotation is taken turns.
The support platform includes upper steel plate and lower steel plate, is connected between upper steel plate and lower steel plate by I-steel.
The sample case is made of the framework that multilayer channel steel forms, and passes through angle steel and bolt between the adjacent channel steel of same layer It is connected, is bolted between the channel steel of adjacent two layers framework.
The column is four, and the column fastening connecting ring is also four.
The road surface sample is Laminate construction thickness and material road surface sample identical with practical road surface.
A kind of pavement structure mechanical behavior test method, this method are tested using pavement structure mechanical behavior as described above Device.
This method specifically includes the following steps:
Step 1, early-stage preparations:
For the pavement structure of quasi- research, use road surface mechanics primary Calculation determine the crucial damage field of pavement structure with And the constraint rigidity that the region is born, meanwhile, according to Rigidity Matching principle, select the sample case of proper restraint rigidity and support flat Platform, and the rigidity of sample case and support platform is finely adjusted, it is ensured that the constraint rigidity and practical road that crucial damage field is born Face it is consistent;
Step 2, sample production:
On the basis of step 1, determining sample case and support platform are mounted on roller box, roller box is mounted on guide rail On, using the debulking methods that vibrate, sample case internal production ground surface material and each Laminate construction thickness with practical pavement structure Identical road surface sample in the sample manufacturing process of road surface, buries temperature sensor and mechanics sensing in pavement structure corresponding position Device;
Wheel load is previously applied in step 3:
Road surface sample completes and after Wetted constructures, and sample case and road surface sample are moved to immediately below tire, Then vertical wheel load is applied using the Hydrauservo System road pavement sample of hoistable platform;
Step 4, tire positioning:
It after vertical wheel load applies, adjusts and fastens the telescoping, tensioning bar in tire positioning mechanism, it is ensured that taken turns during test Tire will not move horizontally;
Step 5, the adjustment of temperature and humidity environment:
It is required according to test objective, sets and adjust the temperature in insulated building by temperature control system and humidity control system Degree and humidity, provide respective environment condition;
Step 6, the test of road surface mechanical behavior:
Start either-rotation motor, drives support platform, sample case and road surface sample on guide rail under the driving of either-rotation motor It is reciprocating, it carries out road surface mechanical behavior under loopy moving load and tests;
Step 7, data collection and processing:
During CYCLIC LOADING, the mechanical behavior information inside the sample of road surface is acquired in real time;The different phase and examination of test After the completion of testing, stop the horizontal movement of road surface sample, acquire the collapse state information on road surface, is handled by the analysis of data, research Pavement structure mechanical property.
Compared with prior art, the present invention having the following technical effect that
(I) pavement structure mechanical behavior experimental rig of the invention, due to using steel construction simulated roadway surrounding structure pair The effect of contraction of crucial damage field can simulate practical road surface surrounding structure road pavement in a natural environment to the maximum extent The restriction behavior of crucial damage field, it is ensured that test result can reflect practical road surface mechanical behavior truly and effectively.
(II) pavement structure mechanical behavior experimental rig of the invention, using the practical heavy type by servo-hydraulic control Vehicle tyre simulates vertical wheel load, is moved horizontally using road surface sample relative to what the reciprocating motion simulation actual wheel of tire carried, The feature that pavement structure in actual traffic bears wheel load is effectively simulated, ensure that the accuracy of test.
(III) pavement structure mechanical behavior experimental rig of the invention is taken turns due to having decomposed in test using positioning mechanism The radial force that tire is born, is effectively protected hydraulic servo loading system.
(IV) pavement structure mechanical behavior experimental rig of the invention, due to being mounted with temperature control system in insulated building And humidity control system, it is ensured that the pavement structure mechanical property under different temperatures environment and condition of raining can be studied, can also be ground Study carefully the coupling effect of the environmental conditions such as tyre load and temperature, water content.
(V) pavement structure mechanical behavior test method of the invention, due to using steel construction simulated roadway surrounding structure pair The effect of contraction of crucial damage field, and loaded using mature hydraulic servo loading system, and what is applied is to follow Ring moves wheel load, has not only ensured that the test result of this test method was able to reflect the mechanical behavior on practical road surface, but also ensured examination Test loading velocity it is fast, it is high-efficient, expend few, and the influence of temperature and humidity road pavement structural damage can be studied, effectively Solves the defect of small sample test method(s) and full scale test method.
Detailed description of the invention
Fig. 1 is whole positive structure diagram of the invention.
Fig. 2 is whole side structure schematic view of the invention.
Fig. 3 is the contact schematic diagram of tire with road surface sample.
Fig. 4 is the combination positive structure diagram of support platform and roller box.
Fig. 5 is the combination side structure schematic view of support platform and roller box.
Fig. 6 is the overlooking structure diagram of tire location structure.
Fig. 7 is the decomposition texture schematic diagram of telescoping, tensioning bar.
Fig. 8 is the positive structure diagram of sample case.
Fig. 9 is the overlooking structure diagram of sample case.
Figure 10 is adjacent upper channel steel and lower layer's steel channel connection structure schematic diagram.
Figure 11 is adjacent same layer steel channel connection structure schematic diagram.
The meaning of each label in figure are as follows: 1- insulated building, 2- temperature control system, 3- humidity control system, 4- pedestal, 5- Column, 6- hoistable platform, 7- telescopic oil cylinder, 8- loading mechanism, 9- tire, 10- tire positioning mechanism, 11- guide rail, 12- roller box, 13- support platform, 14- sample case, the road surface 15- sample, 16- limiter;
(10-1)-column fastening connecting ring, (10-2)-telescopic oil cylinder fastening connecting ring, (10-3)-telescoping, tensioning bar, (10-4)-fastening bolt;
(10-3-1)-the first female adapter, (10-3-2)-the first steel pipe, (10-3-3)-the first male connection, (10-3-4)-the second male connection, (10-3-5)-the second steel pipe, (10-3-6)-the second female adapter, (10-3-7)-the Three male connections, the female adapter of (10-3-8)-third;
(12-1)-takes turns box body, (12-2)-guide wheel, (12-3)-wheel shaft, (12-4)-either-rotation motor;
(13-1)-upper steel plate, (13-2)-lower steel plate, (13-3)-I-steel;
(14-1)-channel steel, (14-2)-angle steel, (14-3)-bolt.
Explanation is further explained in detail to particular content of the invention with reference to embodiments.
Specific embodiment
Specific embodiments of the present invention are given below, it should be noted that the invention is not limited to implement in detail below Example, all equivalent transformations made on the basis of the technical solutions of the present application each fall within protection scope of the present invention.
Embodiment 1:
As shown in Figure 1 to 11, the present embodiment provides a kind of pavement structure mechanical behavior experimental rig, including insulated building 1, Temperature control system 2 and humidity control system 3 are installed, the bottom in insulated building 1 is provided with pedestal 4, pedestal 4 in insulated building 1 Surrounding is provided with one group of column 5, and the hoistable platform 6 that can be gone up and down on column 5 is equipped on column 5, is installed on hoistable platform 6 There is the telescopic oil cylinder 7 for stretching out 6 bottom of hoistable platform, telescopic oil cylinder 7 is vertically arranged with pedestal 4, and the bottom end of telescopic oil cylinder 7 is provided with Loading mechanism 8 is equipped with tire 9 on loading mechanism 8;
Tire positioning mechanism 10 is installed, the tire positioning mechanism 10 includes on the column 5 and telescopic oil cylinder 7 The column fastening connecting ring 10-1 being mounted on the column 5 and telescopic oil cylinder fastening connecting ring 10-2 being mounted on telescopic oil cylinder 7, It is connected between column fastening connecting ring 10-1 and telescopic oil cylinder fastening connecting ring 10-2 by telescoping, tensioning bar 10-3;
It is equipped with a pair of guide rails 11 on the pedestal 4 of 9 lower section of tire, being equipped on guide rail 11 can be along guide rail 11 The roller box 12 of movement is equipped with support platform 13 on 12 top surface of roller box, and support platform is equipped on 13 top surface for placing road surface The sample case 14 of sample 15.
As a preference, hoistable platform 6 is a pair of of hoistable platform disposed in parallel, the stability of lifting is improved.
It is provided with limiter 16 on guide rail 11, is used for stroke limit.Since the both ends of guide rail 11 are equipped with limiter 16, when When roller box 12 moves to 11 edge certain distance of distance guide rail, limiter 16 issues signal, and then either-rotation motor 12-4 is inverted, from And realize the reciprocating motion of road surface sample.
It is provided with fastening bolt 10-4 on column fastening connecting ring 10-1 and telescopic oil cylinder fastening connecting ring 10-2, it can be square Just fixation is tightened.
Specifically, telescoping, tensioning bar 10-3 includes that the first internal screw thread being fixedly arranged on column fastening connecting ring 10-1 side wall connects Head 10-3-1, the first female adapter 10-3-1 is connected with the first male connection 10-3-3 of first one end steel pipe 10-3-2, The first steel pipe 10-3-2 other end is provided with the second male connection 10-3-4, the second male connection 10-3-4 and the second steel pipe The second female adapter 10-3-6 of the one end 10-3-5 is connected, and the other end of the second steel pipe 10-3-5 is provided with third external screw thread and connects Head 10-3-7, third male connection 10-3-7 and the third internal screw thread being fixedly arranged on telescopic oil cylinder fastening connecting ring 10-2 side wall Connector 10-3-8 is connected.
Specifically, roller box 12 includes wheel box body 12-1, takes turns in box body 12-1 and be equipped with and can be moved along guide rail 11 Guide wheel 12-2, wheel shaft 12-3 is installed on guide wheel 12-2, takes turns to be also equipped on box body 12-1 and turns for controlling wheel shaft 12-3 Dynamic either-rotation motor 12-4.
Specifically, support platform 13 include upper steel plate 13-1 and lower steel plate 13-2, upper steel plate 13-1 and lower steel plate 13-2 it Between connected by I-steel 13-3.
Specifically, sample case 14 is made of the framework that multilayer channel steel 14-1 is formed, lead between the adjacent channel steel 14-1 of same layer It crosses angle steel 14-2 to be connected with bolt 14-3, be connected between the channel steel 14-1 of adjacent two layers framework by bolt 14-3.
Preferably, column 5 is four, and the column fastening connecting ring 10-1 is also four.
Specifically, road surface sample 15 is Laminate construction thickness and material road surface sample identical with practical road surface.
Temperature control system 2 and humidity control system 3 use the temperature and humidity control system of this field routine, such as can be The intelligent precise digital display temperature and humidity controller of SNT-811S-72 of Hangzhou Shiyu Electronic Technology Co., Ltd.'s production.
Surrounding structure road surface is measured to the constraint rigidity of crucial damage field and road according to environment locating for quasi- research road surface The thickness of each layer in face determines the model of channel steel 14--1 and channel steel outboard angle 14-2, branch in the sample case 14 on composition constraint road surface Support the model of I-steel 13-3 and distribution spacing in platform 13.
When experimental rig is installed, it is flat that lifting will be mounted on again after 7 overall package of tire 9, power transmission support base 8 and telescopic oil cylinder On platform 6.Roller box 12 is placed on guide rail 11, and is fixed on one end of guide rail 11;Again in 13 over-assemble sample case of support platform 14, since road surface sample 15 is that layering is prefabricated, in order to make the prefabricated convenience of road surface sample 15, sample case 14 should be assembled successively.
When tire positioning mechanism 10 is installed, while rotating the first steel pipe 10-3-2 and the second steel pipe respectively in the opposite direction 10-3-5 can strut telescoping, tensioning bar 10-3.
After tire positioning mechanism 10 is installed, insulated building 1 is sealed, is controlled according to environment set temperature needed for test The parameter of system 2 and humidity control system 3.
In off-test, it is first shut off either-rotation motor 12-4, removes positioning device after road surface sample 15 is totally stationary, The load that is applied of unloading hydraulic loading device, rises hoistable platform 6, make to have between tire 9 and road surface sample 15 it is enough between Gap is to be convenient for measuring the relevant experimental data of road surface sample 15.After the completion of primary test, sample case 14 and road surface sample are removed 15;Then the prefabricated of next road surface sample 15 can be re-started, next test is carried out.
Embodiment 2:
The present embodiment provides a kind of pavement structure mechanical behavior test method, and this method is using road described in embodiment 1 Face structural mechanical behavior experimental rig, specifically includes the following steps:
Step 1, early-stage preparations:
For the pavement structure of quasi- research, use road surface mechanics primary Calculation determine the crucial damage field of pavement structure with And the constraint rigidity that the region is born, meanwhile, according to Rigidity Matching principle, select sample case 14 and the support of proper restraint rigidity Platform 13, and the rigidity of sample case 14 and support platform 13 is finely adjusted, it is ensured that the constraint rigidity that crucial damage field is born It is consistent with practical road surface;
Step 2, sample production:
On the basis of step 1, determining sample case 14 and support platform 13 are mounted on roller box 12, roller box 12 is pacified On guide rail 11.Using the debulking methods that vibrate, 14 internal production ground surface material of sample case and each Laminate construction thickness with Practical pavement structure identical road surface sample 15 in 15 manufacturing process of road surface sample, buries temperature in pavement structure corresponding position Sensor and mechanics sensor;
Mechanics sensor needs to bury according to test, generally stress strain gauge or pressure sensor;
Wheel load is previously applied in step 3:
Road surface sample 15 completes and after Wetted constructures, and sample case 14 and road surface sample 15 are moved to tire 9 Then underface applies vertical wheel load using the Hydrauservo System road pavement sample 15 of telescopic oil cylinder 7;
Step 4, tire positioning:
After vertical wheel load applies, adjusts and fasten the telescoping, tensioning bar 10-3 in tire positioning mechanism 10, it is ensured that in test Tire will not move horizontally;
Step 5, the adjustment of temperature and humidity environment:
It is required, set by temperature control system 2 and humidity control system 3 and is adjusted in insulated building 1 according to test objective Temperature and humidity, respective environment condition is provided;
Step 6, the test of road surface mechanical behavior:
Start either-rotation motor 12-4, support platform 13, sample case 14 and road surface are driven under the driving of either-rotation motor 12-4 Sample 15 is reciprocating on guide rail 11, carries out road surface mechanical behavior under loopy moving load and tests;
Step 7, data collection and processing:
During CYCLIC LOADING, the mechanical behavior information inside road surface sample 15 is acquired in real time;The different phase of test and After the completion of test, stop 15 horizontal movement of road surface sample, the collapse states information such as acquires the crackle on road surface, track, embraces.Pass through The analysis of data is handled, and studies pavement structure mechanical property.

Claims (9)

1. a kind of pavement structure mechanical behavior experimental rig, including insulated building (1), insulated building (1) is interior to be equipped with temperature control system System (2) and humidity control system (3), which is characterized in that the bottom in insulated building (1) is provided with pedestal (4), around pedestal (4) It is provided with one group of column (5), the hoistable platform (6) that can be gone up and down on column (5), hoistable platform (6) are installed on column (5) On the telescopic oil cylinder (7) for stretching out hoistable platform (6) bottom is installed, telescopic oil cylinder (7) is vertically arranged with pedestal (4), stretches oily The bottom end of cylinder (7) is provided with loading mechanism (8), and tire (9) are equipped on loading mechanism (8);
It is equipped with tire positioning mechanism (10) on the column (5) and telescopic oil cylinder (7), the tire positioning mechanism (10) It is fastened including the column fastening connecting ring (10-1) being mounted on column (5) and the telescopic oil cylinder being mounted on telescopic oil cylinder (7) Connection ring (10-2) passes through telescoping, tensioning bar between column fastening connecting ring (10-1) and telescopic oil cylinder fastening connecting ring (10-2) (10-3) is connected;
It is equipped with a pair of guide rails (11) on pedestal (4) below the tire (9), being equipped on guide rail (11) can be along leading The roller box (12) of rail (11) movement, is equipped with support platform (13) on roller box (12) top surface, installs on support platform (13) top surface There is the sample case (14) for placing road surface sample (15);
The telescoping, tensioning bar (10-3) includes that the first internal screw thread being fixedly arranged on column fastening connecting ring (10-1) side wall connects Head (10-3-1), the first male connection (10-3- of the first female adapter (10-3-1) and the one end the first steel pipe (10-3-2) 3) it is connected, the first steel pipe (10-3-2) other end is provided with the second male connection (10-3-4), the second male connection (10- 3-4) be connected with second female adapter (10-3-6) of the one end the second steel pipe (10-3-5), the second steel pipe (10-3-5) it is another End is provided with third male connection (10-3-7), third male connection (10-3-7) be fixedly arranged at telescopic oil cylinder and be fastenedly connected Third female adapter (10-3-8) on ring (10-2) side wall is connected.
2. pavement structure mechanical behavior experimental rig as described in claim 1, which is characterized in that set on the guide rail (11) It is equipped with limiter (16).
3. pavement structure mechanical behavior experimental rig as described in claim 1, which is characterized in that the column is fastenedly connected Fastening bolt (10-4) is provided on ring (10-1) and telescopic oil cylinder fastening connecting ring (10-2).
4. pavement structure mechanical behavior experimental rig as described in claim 1, which is characterized in that the roller box (12) includes It takes turns box body (12-1), the guide wheel (12-2) that can be moved along guide rail (11), guide wheel is installed in wheel box body (12-1) It is equipped with wheel shaft (12-3), is also equipped on wheel box body (12-1) for controlling the two-way of wheel shaft (12-3) rotation on (12-2) Motor (12-4).
5. pavement structure mechanical behavior experimental rig as described in claim 1, which is characterized in that the support platform (13) Including upper steel plate (13-1) and lower steel plate (13-2), pass through I-steel (13-3) between upper steel plate (13-1) and lower steel plate (13-2) Connection.
6. pavement structure mechanical behavior experimental rig as described in claim 1, which is characterized in that the sample case (14) by The framework of multilayer channel steel (14-1) composition forms, and passes through angle steel (14-2) and bolt (14- between the adjacent channel steel (14-1) of same layer 3) it is connected, is connected between the channel steel (14-1) of adjacent two layers framework by bolt (14-3).
7. pavement structure mechanical behavior experimental rig as described in claim 1, which is characterized in that the road surface sample (15) For Laminate construction thickness and material road surface sample identical with practical road surface.
8. a kind of pavement structure mechanical behavior test method, which is characterized in that this method uses any right of claim 1 to 7 It is required that the pavement structure mechanical behavior experimental rig.
9. pavement structure mechanical behavior test method as claimed in claim 8, which is characterized in that this method specifically includes following Step:
Step 1, early-stage preparations:
For the pavement structure of quasi- research, the crucial damage field of pavement structure is determined using road surface mechanics primary Calculation and is somebody's turn to do The constraint rigidity that region is born, meanwhile, according to Rigidity Matching principle, select the sample case (14) of proper restraint rigidity and support flat Platform (13), and the rigidity of sample case (14) and support platform (13) is finely adjusted, it is ensured that the constraint that crucial damage field is born Rigidity is consistent with practical road surface;
Step 2, sample production:
On the basis of step 1, determining sample case (14) and support platform (13) are mounted on roller box (12), roller box (12) it is mounted on guide rail (11), using the debulking methods that vibrate, in sample case (14) internal production ground surface material and each structure Thickness degree road surface sample (15) identical with practical pavement structure, in road surface sample (15) manufacturing process, in pavement structure phase Position is answered to bury temperature sensor and mechanics sensor;
Wheel load is previously applied in step 3:
Road surface sample (15) completes and after Wetted constructures, and sample case (14) and road surface sample (15) are moved to tire (9) immediately below, vertical wheel load is then applied using the Hydrauservo System road pavement sample (15) of telescopic oil cylinder (7);
Step 4, tire positioning:
After vertical wheel load applies, adjusts and fasten the telescoping, tensioning bar (10-3) in tire positioning mechanism (10), it is ensured that tested Tire will not move horizontally in journey;
Step 5, the adjustment of temperature and humidity environment:
It is required according to test objective, set by temperature control system (2) and humidity control system (3) and adjusts insulated building (1) In temperature and humidity, respective environment condition is provided;
Step 6, the test of road surface mechanical behavior:
Start either-rotation motor (12-4), under the driving of either-rotation motor (12-4) drive support platform (13), sample case (14) and Road surface sample (15) is reciprocating on guide rail (11), carries out road surface mechanical behavior under loopy moving load and tests;
Step 7, data collection and processing:
During CYCLIC LOADING, road surface sample (15) internal mechanical behavior information is acquired in real time;The different phase and examination of test After the completion of testing, stop road surface sample (15) horizontal movement, acquire the collapse state information on road surface, is handled by the analysis of data, Study pavement structure mechanical property.
CN201710487292.XA 2017-06-23 2017-06-23 A kind of pavement structure mechanical behavior experimental rig and test method Expired - Fee Related CN107478802B (en)

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