CN209979382U - Performance test device for simulating unsaturated roadbed of airport under dynamic and static loads - Google Patents
Performance test device for simulating unsaturated roadbed of airport under dynamic and static loads Download PDFInfo
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- CN209979382U CN209979382U CN201920813639.XU CN201920813639U CN209979382U CN 209979382 U CN209979382 U CN 209979382U CN 201920813639 U CN201920813639 U CN 201920813639U CN 209979382 U CN209979382 U CN 209979382U
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Abstract
The utility model discloses a performance test device of a simulated airport unsaturated roadbed under dynamic and static loads, which comprises a model box and a loading device, wherein the model box is a box body with an upper opening and is used for filling unsaturated roadbed soil bodies and roadbed materials in layers, so that the unsaturated roadbed soil bodies and the roadbed materials can keep consistent with the actual engineering of the airport, monitoring equipment for testing parameters required by the roadbed performance can be respectively arranged in each layer of soil body, a water injection hole is arranged in the middle part of the side wall of the model box, and water can be injected into a middle interlayer of the roadbed soil body for multiple times to change the water content of the roadbed soil body; the loading device comprises two sets, each set of loading device comprises a support frame and load applying equipment, the two support frames are arranged in parallel, the two load applying equipment are respectively fixed on the bottom surfaces of the support frames, the two ends of each support frame are respectively detachably fixed on the support plates on the two sides of the opening surface of the model box, the load applying equipment is used for providing layered roadbed soil body compaction load and applying roadbed load, roadbed performance changes under the conditions of different water contents and applied load are monitored, and roadbed hidden disasters are effectively revealed.
Description
Technical Field
The utility model belongs to ground test instrument field, concretely relates to unsaturated roadbed capability test device under sound load condition in simulation airport.
Background
The airport runway foundation is used as a main load-bearing part of airplane load and plays an important role in an airport comprehensive transportation system. On one hand, the long-term action of the airplane load causes additional stress in the roadbed, so that the soil body deforms; on the other hand, the pavement slab covers and obstructs the water transfer between the pavement and the atmosphere, so that a certain range of water concentration under the pavement slab is caused, the mechanical property of the soil body of the pavement slab is weakened, and the strength of the soil body of the pavement slab is reduced; under the action of airplane load and water accumulation, the roadbed soil body is unevenly settled, and the seaworthiness of the roadbed is seriously influenced by the disaster of the roadbed.
The method has the advantages that the hidden property of the disaster of the roadbed is high under the action of the load of the airplane, the operation intensive degree of the airplane is high, and the maintenance window period is short, so that the potential disaster of the roadbed can be found in time, effective measures are taken for prevention and treatment, and the method plays a key role in later-stage operation and maintenance of the airport. However, no relevant means is available at present for effectively evaluating and detecting the performance of the unsaturated runway foundation of the airport and hidden disasters in the operation period.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a road bed performance change's testing arrangement when the monitoring facilities of cooperation pre-buried in the road bed soil body come the different aircraft types of simulation test repeatedly on the road surface and take off and land.
The utility model provides a performance testing device of an unsaturated roadbed of a simulated airport under dynamic and static loads, which comprises a model box and a loading device, wherein the model box is a box body with an upper opening and is used for filling unsaturated roadbed soil bodies and roadbed materials in layers, and the middle part of the side wall of the model box is provided with a water injection hole; the loading device comprises two sets, each set of loading device comprises a support frame and load applying equipment, the two support frames are arranged in parallel, the two load applying equipment are respectively fixed on the bottom surfaces of the support frames, two ends of each support frame are respectively detachably fixed on support plates on two sides of an opening surface of the model box, and layered roadbed soil body compaction load and applied pavement load are provided through the load applying equipment.
In an embodiment of the above technical scheme, the mold box is a rectangular box body, and comprises a mounting framework, and a side plate and a bottom plate fixed on the mounting framework, wherein a visual organic glass plate is mounted in the middle of the side plate, and reinforcing ribs are arranged on the outer sides of the side plate and the organic glass plate.
In one embodiment of the above technical solution, the model box adopts an assembled structure of a side plate module and a bottom plate module, the side plate module includes a side plate, a visual organic glass plate, an installation framework thereof and a reinforcing rib, and the bottom plate module includes a bottom plate, an installation framework thereof and a reinforcing rib; and the side plate modules and the bottom plate modules are assembled to perform anti-leakage treatment.
In one embodiment of the above technical scheme, the water injection hole is connected with an internal thread sleeve, and the internal thread sleeve is matched with a water stop bolt.
In one embodiment of the above technical scheme, the number of the support plates is two, the two support plates are symmetrically fixed at the top of a pair of side plate module mounting frameworks at the top end of the model box, and two rows of round holes for mounting the support frames are arranged on the support plates along the length direction, so that the distance between the two support frames is adjustable.
In an embodiment of the above technical scheme, the load applying device includes a static load applying device cylinder or oil cylinder or electric push rod or hydraulic jack, and further includes a dynamic load applying device GDS vibration exciter.
In one embodiment of the above technical scheme, mounting plates are arranged at two ends of the support frame, long round holes are formed in the mounting plates, and the support frame is fixed on the support plate through fasteners penetrating through the long round holes and the round holes in the support plate.
The utility model discloses a mold box is used for interior layering filling unsaturated roadbed soil body and pavement material, can make roadbed soil body and pavement material can keep with the actual unanimity when airport engineering construction, can set up the monitoring facilities who tests the required parameter of roadbed performance respectively in each layer soil body simultaneously, and the water injection hole of accessible mold box lateral wall changes its water content for the intermediate layer multiple injection water of roadbed soil body. Through setting up the loading device at model roof portion, loading device's load is applyed equipment and is applyed the load to different water contents, and the accessible monitors different water contents and applys the roadbed performance change under the load condition at pre-buried monitoring facilities, effectively reveals roadbed hidden calamity, is equivalent to and uses actual airport engineering as the research background, and the test result can be better be arranged in airport roadbed calamity prevention and cure engineering. The compaction of the roadbed soil body is carried out through the load applying equipment, and the required compaction degree can be ensured. The device is matched with various monitoring devices which are pre-buried in the roadbed soil body and combined with a proper analysis system, so that the hidden disasters of the roadbed can be effectively revealed, and a technical basis with a strong reference significance is provided for similar airport engineering.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is an enlarged view of front and rear side plate modules of the mold box of fig. 1.
Fig. 3 is an enlarged view of left and right side plate modules of the mold box of fig. 1.
Fig. 4 is an enlarged schematic structural diagram of the loading device in fig. 1.
Fig. 5 is an enlarged structural view of a support plate for mounting a loading device at the upper end of the side plate module.
Detailed Description
As can be seen from FIG. 1, the performance testing device for the unsaturated roadbed of the simulated airport disclosed by the embodiment under dynamic and static loads comprises a model box 1 and a loading device 2 fixed at the upper end of the model box.
For convenience of manufacture and assembly, the mold box 1 of the present embodiment is a box body having a square structure as shown in fig. 1, and is defined by front and rear side plate modules 11, left and right side plate modules 12, and a bottom plate module 13.
As can be seen from fig. 1 and 2, the front and rear side plate modules 11 include a square steel frame and side plates fixed to the inner side thereof. The curb plate includes the visual glass board BLB of intermediate position and steel sheet GB around it, because the intensity of visual glass board is less than the steel sheet, needs further strengthen, so the square steel skeleton sets up independent little module 111 in the region that corresponds outside visual glass board, and this prescription steel arrangement adopts the groined type to guarantee visual glass board BLB's atress performance.
As can be seen from fig. 1 and 3, the left and right side plate modules 12 and the front and rear side plate modules 11 have substantially the same structure, and the difference is that two sides of the steel plate GB around the visual glass plate BLB of the left and right side plate modules 12 respectively extend out of the mounting frame.
The splicing positions of the four side plate modules 11 are fixed through fasteners, and the extending parts of the left and right side plate module steel plates are connected and fastened with the side edge square steel of the front and rear side plate modules through bolts. During manufacturing, the four side plate modules can be independently manufactured at the same time, the upper ends of the square steel frameworks of the front and rear side plate modules are provided with supporting plates 112 used for installing loading devices, and as can be seen from fig. 1 and 4, the lower sides of the supporting plates 112 are provided with reinforcing square steel. In order to adjust the mounting position of the loading device, two rows of circular holes are formed along the length direction of the supporting plate 112.
As shown in fig. 1, the bottom plate module 13 includes a square steel frame and a bottom plate fixed to a top surface thereof.
When the concrete assembly is carried out, the adjacent side plate modules are sequentially arranged on the bottom plate module and then are fastened through the bolt connection.
After the model box 1 is assembled, the splicing part needs to be coated with foam rubber for sealing, plastic cloth is laid inside the inner wall of the box body for preventing leakage, and the plastic cloth is cut at the position corresponding to the visual glass plate BLB.
The loading device 2 has two sets, and each set comprises a support frame and a load applying device. The load applying device includes a static load applying device and a dynamic load applying device.
In the embodiment, the static load applying device adopts a hydraulic jack 21, the dynamic load applying device adopts a GDS vibration exciter, fig. 5 shows the hydraulic jack, and correspondingly, the supporting frame adopts a reaction frame 22.
As shown in fig. 5, the hydraulic jack 21 is fixed to the longitudinal center plane of the reaction frame 22. The mounting plates at the two ends of the reaction frame 22 are provided with oblong holes corresponding to the round holes on the support plate 112, so that the transverse position of the reaction frame 22 can be finely adjusted when the reaction frame is fixedly mounted by selecting the appropriate round holes. The hydraulic jack needs to be provided with a plurality of loading plates, and the size of each loading plate is determined according to the calculation method and the geometric similarity ratio of the wheel prints of different airplane types in the airport pavement design specification.
Of course, a strip-shaped groove can be formed in the support plate along the length direction, oblong holes are formed in the mounting plates at the two ends of the support frame, and bolts, fastening nuts and gaskets are matched in the oblong holes. When the support frame position adjustment, the bolt slides to suitable position along the bar groove in the backup pad, then moves fastening nut and compresses tightly the gasket in the backup pad.
After the model boxes are assembled and subjected to anti-leakage treatment, prepared roadbed soil is filled into the model boxes for three times, after the three layers of soil are compacted to set thickness, the thicknesses of the bottom layer and the top layer are the same, and the thickness of the middle interlayer is smaller. And a layer of waterproof film is paved between the middle interlayer soil body and the bottom layer soil body and between the middle interlayer soil body and the top layer soil body.
When the roadbed soil body is loaded into the model box, monitoring equipment needs to be arranged in each layer of soil body, and the method specifically comprises the following steps: a plurality of miniature pressure gauges and multipoint displacement gauges are uniformly distributed in the bottom soil body respectively; the middle interlayer is required to be uniformly distributed with a plurality of miniature soil pressure gauges, multipoint displacement meters, TDR probes and tensiometers on the lower waterproof film; a plurality of miniature soil pressure gauges and multipoint displacement meters are uniformly distributed in the top soil body respectively.
When carrying out the capability test, need to pour into water into to intermediate layer soil body, through intermediate layer simulation airport way foundation moisture accumulation layer, the foundation soil body performance that says under the different water content condition of test changes, so when curb plate module preparation, need the high processing hole that corresponds at intermediate layer, and the internal thread sleeve pipe of welding in the hole, give the supporting stagnant water bolt of internal thread sleeve pipe simultaneously. The number and the orientation of the internally threaded sleeves are determined according to actual requirements. When the roadbed soil body is added with water, the water stop bolt is screwed into the internal thread sleeve.
And uniformly compacting each layer of soil body to a set thickness. When the soil body is filled, the material needs to be poured uniformly, the surface of the soil body is leveled at last, a compaction plate with the size slightly smaller than the size of the inner cavity of the box body is paved after leveling, then the loading device is arranged at the top of the model box, the compaction plate is loaded through the load applying equipment, the loading device and the compaction plate are moved after compaction is completed, and then the soil body on the upper layer is filled and compacted.
Paving pavement materials after the three layers of roadbed soil bodies are compacted, and curing the pavement materials into a pavement structure.
The roadbed performance can be tested. Firstly, determining the distance between the load acting points of the two main undercarriages of various airplane types of the airport, and respectively enabling the distance between the load loading devices of the two sets of loading devices to correspond to the distance between the load acting points of the main undercarriages through the selected geometric similarity ratio during the test.
The concrete procedure of the performance and disaster test of the unsaturated runway foundation of the airport using the test device will be described in detail below by taking the model box size of 2000mm × 2000mm × 1900mm as an example.
Determining the thickness of each layer of channel foundation soil body in the model box as follows: 650mm of bottom layer and top layer, 300mm of middle interlayer and 200mm of pavement material.
First, roadbed performance test under static load condition
(1) Preparing a roadbed soil body and a pavement material required by a test, wherein the roadbed soil body and the pavement material are consistent with the actual engineering of the roadbed pavement of the airport pavement, and a mountain leather material is adopted as the pavement material in the embodiment;
(2) filling a bottom layer roadbed soil body into the model box, filling the bottom layer roadbed soil body for three times, leveling the surface of the soil body after filling the soil body each time, and paving a compacting plate; compacting a bottom soil body to 200mm for the first time, then moving away a compacting plate, and respectively and uniformly distributing 5 YT-200G type strain type micro soil pressure meters and 5 BFDWJ type vibrating wire type multipoint displacement meters on the surface of the soil body; compacting the bottom soil body to 400mm for the second time, then moving away the compacting plate, and respectively and uniformly distributing 5 YT-200G type strain type micro soil pressure meters and 5 BFDWJ type vibrating wire type multipoint displacement meters on the surface of the soil body; thirdly, compacting the bottom soil body to 650mm, and then moving away the compacting plate, wherein the vertical positions of the two layers of monitoring equipment respectively correspond to each other;
(3) in the process of compaction, a hydraulic jack loads a compaction plate to compact the soil body to a set thickness, and then the compaction plate is moved away, and a cushion block is arranged below a push rod of the hydraulic jack during loading;
(4) laying a lower waterproof film on the surface of the bottom compacted soil body, and checking that each internal threaded pipe is screwed with a water stop bolt. Filling a road foundation soil body with a middle interlayer into a model box, filling twice, uniformly distributing 5 YT-200G type strain type micro soil pressure meters, BFDWJ type vibrating wire type multipoint displacement meters, CS605 type TDR probes and Tensio 140 micro tensiometers at the position where the middle soil body is compacted to 150mm, leveling the surface of the soil body, paving a compacting plate, repeating the step (3) to compact the middle interlayer to 300mm, and finally paving an upper waterproof film;
(5) loading a top layer road foundation soil body into a model box, leveling the surface of the soil body, then paving a compacting plate, filling the top layer soil body for three times, respectively and uniformly distributing 5 YT-200G type strain micro soil pressure meters and 5 BFDWJ type vibrating wire multipoint displacement meters at the positions with the compacted thickness of the top layer soil body of 200mm and 400mm, respectively corresponding the vertical positions of two layers of monitoring equipment to bottom layer soil body monitoring equipment, moving the compacting plate after the top layer soil body is compacted to 650mm, finally paving a road surface material with the thickness of 200mm, and maintaining until a road surface structure is formed;
(6) accessing a data line of monitoring equipment arranged in each soil layer into a DM-YB1820 type dynamic and static test analysis system, wherein the test analysis system consists of a data acquisition instrument and data recording software carried by the data acquisition instrument, installing the data recording software in a computer, connecting the data acquisition instrument with the data recording software, setting the data sampling frequency to be 100Hz, and debugging the test analysis system to ensure that the data recording software can acquire test data;
(7) installing and fixing reaction frames of the two loading devices at the top of the model box according to the distance between the load action points of the two main undercarriages corresponding to the selected airplane type and the geometric similarity ratio, and fastening the reaction frames through bolts;
(8) according to different set water contents (20%, 40%, 60%, 80% and 100% respectively), water is injected into the soil body of the middle interlayer one by one, each time the water injection is stopped when the reading of the CS605 type TDR probe reaches the corresponding set water content, the test adopts a graded loading mode, after each time the water injection is finished, the ejector rod of the hydraulic jack is enabled to carry out graded loading on the pavement to the set static load through the loading plate, the static loads of different types of airplanes are determined through the design specifications of the pavement, and the test data reflected by each monitoring device is recorded.
(9) Unloading the loading device, carrying out nondestructive detection on the surface of the pavement by using an SIR-3000 portable through-the-earth radar, and collecting waveforms;
(10) and (3) removing the SIR-3000 portable through-the-earth radar, selecting another airplane type, reinstalling the loading device, adjusting the distance between the two reaction frames according to the distance between the loading action points of the main landing gear of the airplane type and the geometric similarity ratio, and repeating the steps (8) and (9).
Second, roadbed performance test under dynamic load condition
In the test under the dynamic load condition, only the load applying equipment needs to be replaced by the dynamic load applying equipment, the GDS vibration exciter is adopted as the dynamic load applying equipment in the embodiment, and the steps (8) to (10) are repeated.
Analysis of
According to the test data reflected by each monitoring device during each loading, drawing a load-displacement curve, a load-water content change curve, a load-matrix suction change curve and a load-soil pressure curve, and analyzing the performance evolution rule of the unsaturated runway foundation of the airport according to the curves; analyzing according to a load-displacement curve to obtain the change rule of soil body settlement along with time and load at different positions of a roadbed soil body, finding out an uneven settlement distribution area in the roadbed soil body, and adopting roadbed treatment measures such as increasing the packing compactness, uneven packing and the like in the actual airport engineering; analyzing according to a load-water content change curve to obtain a water deviation rule of the roadbed soil under the action of airplane load, finding out a water accumulation area of the roadbed soil, increasing the water permeability of fillers at a position corresponding to an actual project, and reducing the occurrence probability of the roadbed water accumulation; obtaining a change rule of the saturation at different positions of the channel foundation soil body under the action of the airplane load according to the load-matrix suction curve, finding out a shear strength change sensitive area in the channel foundation soil body under the action of the airplane load due to the fact that the shear strength of the unsaturated channel foundation soil body is greatly influenced by the saturation and the matrix suction, and obtaining the change rule of the shear strength of the unsaturated channel foundation soil body; analyzing according to the load-soil pressure curve to obtain the soil pressure distribution rule of the unsaturated road foundation, and finding out the distribution of the plastic zone of the road foundation and a stress concentration zone; the distribution of the water accumulation area of the roadbed and the hidden disasters of the roadbed are analyzed according to the oscillogram measured by the miniature ground penetrating radar, the feasibility of the method is verified by comparing the water content distribution measured by the TDR probe, and a technical basis is provided for long-term service performance perception and disaster prevention and control measure formulation of the unsaturated roadbed of the airport.
Claims (7)
1. The utility model provides a simulation airport unsaturated roadbed capability test device under sound load which characterized in that: the loading device comprises a model box and a loading device, wherein the model box is a box body with an upper opening and is used for filling unsaturated roadbed soil and pavement materials in a layered mode, and a water injection hole is formed in the middle of the side wall of the model box; the loading device comprises two sets, each set of loading device comprises a support frame and load applying equipment, the two support frames are arranged in parallel, the two load applying equipment are respectively fixed on the bottom surfaces of the support frames, two ends of each support frame are respectively detachably fixed on support plates on two sides of an opening surface of the model box, and layered roadbed soil body compaction load and applied pavement load are provided through the load applying equipment.
2. The apparatus of claim 1, wherein: the model box is a cuboid box body, and the middle part of a side plate of the model box is provided with a visual organic glass plate for observing the settlement of the roadbed soil body.
3. The apparatus of claim 2, wherein: the model box adopts a split mounting type structure of a side plate module and a bottom plate module, the side plate module comprises a mounting framework and a side plate fixed on the inner side of the mounting framework, the bottom plate module comprises a mounting framework and a bottom plate fixed on the top surface of the mounting framework, and anti-leakage treatment is carried out after the side plate module and the bottom plate module are assembled.
4. The apparatus of claim 1, wherein: an internal thread sleeve is connected to the water injection hole, and a water stopping bolt is matched with the internal thread sleeve.
5. The apparatus of claim 3, wherein: the supporting plate is provided with two supporting plates which are symmetrically fixed at the top of the side plate module mounting framework at one side of the model box, and two rows of round holes for mounting the supporting frames are arranged on the supporting plate along the length direction, so that the distance between the two supporting frames can be adjusted.
6. The apparatus of claim 2, wherein: the load applying equipment comprises a static load applying equipment cylinder or oil cylinder or electric push rod or hydraulic jack and also comprises a dynamic load applying equipment vibration exciter.
7. The apparatus of claim 5, wherein: the support frame is fixed on the support plate through a fastener which penetrates through the long round hole and the round hole in the support plate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920813639.XU CN209979382U (en) | 2019-05-31 | 2019-05-31 | Performance test device for simulating unsaturated roadbed of airport under dynamic and static loads |
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| CN201920813639.XU CN209979382U (en) | 2019-05-31 | 2019-05-31 | Performance test device for simulating unsaturated roadbed of airport under dynamic and static loads |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110082213A (en) * | 2019-05-31 | 2019-08-02 | 中南大学 | Performance test methods and device of the virtual airport unsaturation road base under sound load |
| CN111610094A (en) * | 2020-05-29 | 2020-09-01 | 西南交通大学 | Model test device and test method for high-speed railway roadbed passing karez |
-
2019
- 2019-05-31 CN CN201920813639.XU patent/CN209979382U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110082213A (en) * | 2019-05-31 | 2019-08-02 | 中南大学 | Performance test methods and device of the virtual airport unsaturation road base under sound load |
| CN110082213B (en) * | 2019-05-31 | 2024-03-12 | 中南大学 | Performance test method and device for simulating unsaturated road base of airport under dynamic and static loads |
| CN111610094A (en) * | 2020-05-29 | 2020-09-01 | 西南交通大学 | Model test device and test method for high-speed railway roadbed passing karez |
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