CN111402701A - Equal-load replacement light roadbed bearing detection simulation device and implementation method - Google Patents
Equal-load replacement light roadbed bearing detection simulation device and implementation method Download PDFInfo
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- CN111402701A CN111402701A CN202010224339.5A CN202010224339A CN111402701A CN 111402701 A CN111402701 A CN 111402701A CN 202010224339 A CN202010224339 A CN 202010224339A CN 111402701 A CN111402701 A CN 111402701A
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Abstract
The invention discloses an equal-load replacement light roadbed bearing detection simulation device and an implementation method thereof, wherein the equal-load replacement light roadbed bearing detection simulation device comprises a model box, a scaled model, a loading system, a bearing plate and test components, the scaled model comprises a foundation model, an existing building or structure model and a light roadbed model, the loading system comprises a loading device, a pressure sensor and a counterforce device, the bearing plate is positioned at the upper end of the light roadbed model, the loading system transmits a simulated load to the light roadbed model through the bearing plate, and the test components are distributed on the existing building or structure model, the light roadbed model and the bearing plate. The device can simulate and manufacture the existing building and the light roadbed adjacent to or striding over the existing building, directly test the stress characteristics of the existing building and the light roadbed through the test components and can be used for guiding the actual engineering design on site.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering, in particular to a load detection simulation device for an equal-load replacement light roadbed and an implementation method.
Background
In recent years, with the rapid development of rail transit, a new building or structure and an existing building or structure are inevitably affected by crossing, and the mutual relationship between the new building or structure and the existing building or structure includes close proximity, overpass, underpass and the like. Under the additional load action of a new building or structure, the existing building or structure may have the defects of uneven settlement, inclination instability, crushing, fracturing and the like, and even cause serious safety accidents.
In order to prevent additional stress from being formed on the foundation of an existing building or a structure by the new building or the structure and influence the normal use function of the existing building or the structure, the adverse effect of a newly-built roadbed on an adjacent ballastless roadbed, an operation tunnel and a bridge is generally solved by performing equal-load replacement on the foundation by using a composite light pile.
At present, in the prior art, researches, patents, papers, specifications and the like aiming at the stress characteristics of a light roadbed structure are rarely reported, and a test simulation device and an implementation method aiming at the structure are lacked, so that the engineering design requirements are difficult to meet in the actual use process.
Disclosure of Invention
The invention aims to: aiming at the problems in the prior art, the equal-load replacement light roadbed bearing detection simulation device and the implementation method are provided.
In order to achieve the purpose, the invention adopts the technical scheme that:
the equal-load replacement light roadbed bearing detection simulation device comprises a model box, a scaled model, a loading system, a bearing plate and a test component;
the scaled model comprises a foundation model, an existing building or structure model and a light roadbed model, wherein the foundation model is filled in a model box, the existing building or structure is arranged at the upper part or inside the foundation model, and the light roadbed model and the existing building or structure model are arranged at intervals;
the loading system comprises a loading device, a pressure sensor and a counterforce device, wherein the loading device is positioned at the upper end of a bearing plate, the pressure sensor is positioned at the upper end of the loading device, the counterforce device is positioned at the upper end of the pressure sensor, two ends of the counterforce device are placed on the ground, the bearing plate is positioned at the upper end of the light roadbed model, and the loading system transmits a simulated load to the light roadbed model through the bearing plate;
the test components are arranged on the existing building or structure model, the light roadbed model and the bearing plate.
By the structure, the device can effectively simulate and manufacture the existing building and the light roadbed adjacent to or striding over the existing building, and can directly test the stress characteristics of the existing building and the light roadbed through the test components under the simulated track and train load. The equal-load replacement light roadbed bearing detection simulation device and method have the characteristics of clear flow, easiness in implementation, cost saving, reliable result, high detection efficiency and the like, meet the requirements of engineering design and detection, and have good economic and social benefits.
According to the preferable scheme, the light roadbed model comprises a composite light pile, U-shaped light grooves and soil fillers, the composite light pile comprises a pile-forming light body and a composite reinforcement cage, the composite reinforcement cage comprises vertical geogrids and annular geogrids, the vertical geogrids and the annular geogrids are arranged at intervals along the circumferential direction, the vertical geogrids and the annular geogrids are connected into a whole in an intersecting mode, quadrilateral meshes are formed between every two adjacent vertical geogrids and every two adjacent annular geogrids, the pile-forming light body comprises light soil, a protective layer is arranged between the outer wall of the composite reinforcement cage and the wall of a foundation drilling hole, and the composite light pile is arranged in a square mode.
As a preferable scheme of the invention, the U-shaped light groove comprises connecting steel bars, a steel bar mesh, a transverse geogrid and light soil, one end of each connecting steel bar is anchored into the composite light pile, the other end of each connecting steel bar is fixedly connected with the steel bar mesh, the steel bar mesh is arranged at the top of the composite light pile, and the transverse geogrid is arranged in a layered pull-through manner along the height direction.
As a preferable scheme of the present invention, the loading system further includes a main beam, the main beam is located between the pressure sensor and the reaction device, the reaction device includes an anchor pile beam reaction device, a ballast platform reaction device or an anchor pile ballast combined reaction device, and the loading device includes a jack.
According to the preferable scheme, the test components comprise test piles, load sensors, soil pressure boxes, tension meters, displacement meters and strain gauges, a group of load sensors and soil pressure boxes are embedded in every two composite light piles at the U-shaped light groove base, the load sensors are located at the pile tops of the composite light piles, the soil pressure boxes are distributed in the soil centers among the piles, one test pile is selected in every two composite light piles at the U-shaped light groove base, the tension meters are arranged on vertical geogrids and annular geogrids of the test piles at intervals along the pile depth direction, the displacement meters are located at the tops of the bearing plates, and the strain gauges are located in existing buildings or building models.
As a preferable scheme of the invention, the existing building or structure model comprises a tunnel model, the light roadbed model is arranged above the tunnel model, the top of the tunnel model is provided with at least three displacement meters, and at least four strain gauges are arranged at equal intervals along the axial direction of the tunnel model.
As a preferred scheme of the invention, the existing building or structure model comprises a bridge model, the light roadbed model is arranged below a bridge girder body and between two piers, the bridge girder body is provided with at least three displacement meters, and strain gauges are arranged at equal intervals along the axial direction of the piers and the axial direction of a bridge pile foundation.
As a preferable scheme of the invention, the existing building or structure model comprises an embankment model, the light roadbed model is filled on one side or two sides of an embankment side slope, the top surface of the embankment is provided with at least three displacement meters, and soil pressure boxes are arranged at equal intervals along the contact surface of the embankment side slope and the light roadbed.
The equal-load replacement light roadbed bearing detection implementation method comprises the following steps:
s1: constructing foundation models in a layered mode, and constructing existing buildings or building models on the foundation models;
s2: installing a tension meter on the composite reinforcement cage, and drilling a hole on the foundation;
s3, feeding the composite reinforcement cage into the drill hole;
s4: injecting light soil into the drill hole until the drill hole is filled with the light soil, and embedding connecting steel bars at the pile top;
s5: installing a load sensor and a soil pressure box, laying a layer of reinforcing mesh on the pile top, and fixedly connecting the reinforcing mesh with connecting reinforcing steel bars;
s6: installing a tension meter on the transverse geogrid, pouring light soil in a layered mode, and laying the transverse geogrid in a layered mode until the pouring of the U-shaped light groove is completed;
s7: filling soil filler until the top surface of the roadbed in a layered manner, laying a bearing plate, installing a displacement meter, and then sequentially installing a jack, a pressure sensor, a main beam and a counter-force device;
s8: gradually applying load until the maximum design load capacity is reached, reading test data, and sorting and analyzing the test data;
s9: and (5) load is unloaded in a grading way.
The implementation method has the characteristics of clear flow, easiness in implementation, cost saving, reliable result, high detection efficiency and the like, meets the requirements of engineering design and detection, has good economic and social benefits, and has wide popularization and application prospects.
As a preferred embodiment of the present invention, the existing building or structure model includes a tunnel model or a bridge pile model, and in step S1, the tunnel model or the bridge pile model is set in the foundation at the same time when the foundation model is constructed, the tunnel model or the bridge pile model adopts a prefabricated structure, and the prefabricated structure should be marked with a position and pasted with a strain gauge.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
the device can effectively simulate and manufacture the existing building and the light roadbed adjacent to or striding over the existing building, and can directly test the stress characteristics of the existing building and the light roadbed through the test components under the simulated track and train load. The equal-load replacement light roadbed bearing detection simulation device and method have the characteristics of clear flow, easiness in implementation, cost saving, reliable result, high detection efficiency and the like, meet the requirements of engineering design and detection, and have good economic and social benefits.
The implementation method has the characteristics of clear flow, easiness in implementation, cost saving, reliable result, high detection efficiency and the like, meets the requirements of engineering design and detection, has good economic and social benefits, and has wide popularization and application prospects.
Drawings
Fig. 1 is a schematic cross-sectional view of a light roadbed bearing detection simulation device above a tunnel.
Fig. 2 is a partially enlarged view of the region Z in fig. 1.
FIG. 3 is a schematic cross-sectional view of the underpass bridge light roadbed bearing detection simulation device.
Fig. 4 is a schematic cross-sectional view of the load detection simulation device for the wide light roadbed next to the embankment highwall.
Fig. 5 is a schematic view of the composite lightweight pile construction of the present invention.
Fig. 6 is a schematic view of the connection mode of the composite reinforcement cage and the outlet of the pumping pipe in the composite light pile structure.
FIG. 7 is a schematic diagram of the arrangement of the composite reinforcement cage tension meter of the present invention.
Fig. 8 is a schematic plan view of an annular or vertical geogrid tension meter according to the present invention.
Icon: 1-a model box; 2-light roadbed; 21-composite light-weight piles; 22-U type light trough; 221-connecting steel bars; 222-a mesh reinforcement; 223-transverse geogrid; 224-light soil; 23-a soil filler; 3-loading the system; 31-a jack; 32-a pressure sensor; 33-main beam; 34-a counterforce device; 4-a carrier plate; 5-a load sensor; 6-soil pressure cell; 7-a tension meter; 8-a displacement meter; 9-a strain gauge; 10-testing the pile; 11-existing building or structure; 111-pile foundation; 112-bridge pier; 113-a beam body; 12-a composite reinforcement cage; 121-vertical geogrids; 122-annular geogrid; 13-piling a lightweight body; 131-a protective layer; 14-pumping a pipe; 15-annular lock catch; d-foundation;
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Examples
Referring to fig. 1-4, the present embodiment provides an equal-load replacement light roadbed bearing detection simulation device, which includes a foundation D model scaled down according to a scale, and is filled in a model box 1; the existing building or structure 11 model which is scaled down in proportion is arranged on or in the foundation D model, and the existing building or structure 11 is a tunnel or bridge or embankment model; a light roadbed 2 model which is arranged next to or across the existing building or structure 11 according to a proportional scale is composed of a composite light pile 21, a U-shaped light groove 22 and a soil filler 23; the loading system 3 comprises a jack 31, a pressure sensor 32, a main beam 33 and a counterforce device 34, and simulated track and train loads are transmitted to the lower light roadbed 2 model through the bearing plate 4; and the test components are arranged on the existing building or structure 11 model, the light roadbed 2 model and the bearing plate 4.
The composite light pile 21 comprises a pile-forming light body 13 and a composite reinforcement cage 12 embedded in the pile-forming light body, the composite reinforcement cage 12 is composed of vertical geogrids 121 arranged at intervals in the circumferential direction and annular geogrids 122 arranged at intervals in the vertical direction, the vertical geogrids 121 and the annular geogrids 122 are connected into a whole in an intersecting mode, and quadrilateral meshes are formed between every two adjacent vertical geogrids 121 and every two adjacent annular geogrids 122. The pile-forming light body 13 is formed by pouring light soil into the hole of the foundation D from the composite reinforcement cage 12, and a protective layer 131 is formed between the outer wall of the composite reinforcement cage 12 and the hole wall of the hole of the foundation D. The composite lightweight piles 21 are arranged in a square shape.
Referring to fig. 5, the U-shaped light weight groove 22 is composed of connecting reinforcements 221, reinforcing mesh 222, transverse geogrids 223 and light weight soil 224, wherein one end of each connecting reinforcement 221 is anchored into the composite light weight pile 21, the other end of each connecting reinforcement 221 is fixedly connected with the corresponding connecting reinforcement 221, a layer of reinforcing mesh 222 is arranged on the top of the composite light weight pile 21, and the transverse geogrids 223 are arranged in a layered and pulled-through manner along the height direction.
The reaction device 34 is an anchor pile beam reaction device or a ballast platform reaction device or an anchor pile ballast combined reaction device.
Referring to fig. 1-4, the testing components comprise a load sensor 5 for testing the top counter force of a pile 10, an earth pressure cell 6 for testing the earth pressure, a tension meter 7 for testing the tension of the geogrid, a displacement meter 8 for testing the vertical and lateral displacement, and a strain gauge 9 for testing the strain.
Referring to fig. 1, 2, 3, 4, 7 and 8, 1 group of load sensors 5 and soil pressure boxes 6 are buried in the base of a U-shaped light groove 22 every no less than 2 composite light piles 21, the load sensors 5 are arranged at the tops of the composite light piles 21, and the soil pressure boxes 6 are arranged in the soil centers among the piles; selecting 1 test pile 10 at intervals of not less than 2 composite light piles 21 on the basis of a U-shaped light groove 22, arranging tension meters 7 on composite reinforcement cages of the test piles 10, arranging the tension meters 7 on an annular geogrid and a vertical geogrid, arranging the tension meters 7 on a horizontal plane in a quartering opposite mode, and arranging the tension meters 7 at intervals along the depth direction of the piles; tension meters 7 are arranged on the transverse geogrids 223 of the U-shaped light grooves 22, the number of the tension meters 7 arranged at intervals along the transverse direction of the roadbed is not less than 3, and the tension meters 7 are arranged at intervals of 1 transverse geogrid 223 along the height direction of the roadbed. At least 2 displacement meters 8 are arranged on the bearing plate 4.
Referring to fig. 1 and 2, an existing building or structure 11 is a tunnel model, a light roadbed 2 model is arranged on the upper portion of the tunnel model, no less than 3 displacement meters 8 are arranged on the top of the tunnel model, and no less than 4 strain gauges 9 are arranged at equal intervals along the axial direction of the tunnel model.
Referring to fig. 3, the existing building or structure 11 is a bridge model, the light roadbed 2 model is arranged below a bridge beam body 113 and between two bridge piers 112, no less than 3 displacement meters 8 are arranged on the bridge beam body 113, and strain gauges 9 are arranged at equal intervals along the axial direction of the bridge piers 112 and the axial direction of a bridge pile foundation 111.
Referring to fig. 4, an existing building or structure 11 is an embankment model, a light roadbed 2 model is filled on the side of an embankment side slope 1 or 2, no less than 3 displacement meters 8 are arranged on the top surface of the embankment, and soil pressure boxes 6 are arranged at equal intervals along the contact surface of the embankment side slope and the light roadbed 2.
Referring to fig. 1 to 8, another technical problem to be solved by the present invention is to provide an implementation method of the load detection simulation apparatus for an equal-load replacement light roadbed 2 structure, the method includes the following steps:
s1: constructing a foundation D model in the model box 1 in a layering manner;
s2: building a bridge model or an embankment model on the foundation D model;
s3: processing a geogrid into a composite reinforcement cage, installing a tension meter 7, and drilling a hole on the foundation D after the foundation D and the existing building or structure 11 are deformed and stabilized;
s4: sleeving the upper end of the composite reinforcement cage into the outer wall of the outlet end of the pumping pipe 14, locking the composite reinforcement cage by using an annular lock catch 15, and feeding the composite reinforcement cage into a drill hole;
s5: slowly injecting light soil 224 into the drill hole through the pumping pipe 14 until the drill hole is filled with the light soil 224, then loosening the annular lock catch 15, extracting the pumping pipe 14, and embedding a connecting steel bar 221 in the pile top;
s6: installing a load sensor 5 and a soil pressure box 6 on the pile top of the composite light pile 21 and the soil between the piles, laying 1 layer of steel bar mesh 222 on the pile top, and fixing the steel bar mesh 222 and the connecting steel bars 221;
s7: installing a tension meter 7 on the transverse geogrid 223, and pouring light soil 224 in a layered mode to lay the transverse geogrid 223 in a layered mode until the pouring of the U-shaped light groove 22 is completed;
s8: after the cantilever of the U-shaped light groove 22 is solidified, filling soil filler 23 in layers until reaching the top surface of the roadbed, laying a bearing plate 4, installing a displacement meter 8, and then sequentially installing a jack 31, a pressure sensor 32, a main beam 33 and a counter-force device 34;
s9: after debugging all the test components, gradually applying loads through the jack 31 until the maximum design load capacity is reached, reading the test data of the test components, and sorting and analyzing the test data;
s10: the load is unloaded in stages by the jacks 31.
In the scheme, the method comprises the following steps:
in step S1, when constructing the model of the foundation D, the tunnel model or the model of the bridge pile foundation 111 should be installed in the foundation D at the same time, the tunnel model or the model of the bridge pile foundation 111 should be of a prefabricated structure, and the prefabricated structure should be marked with the position and pasted with the strain gauge 9.
In step S2, the bridge pier 112 and the bridge body 113 of the bridge model are prefabricated members, and the positions of the prefabricated members are marked and the strain gauges 9 are attached.
The equal-load replacement light roadbed bearing detection simulation device and method have the characteristics of clear flow, easiness in implementation, cost saving, reliable result, high detection efficiency and the like, meet the requirements of engineering design and detection, have good economic and social benefits and have wide popularization and application prospects.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The equal-load replacement light roadbed bearing detection simulation device is characterized by comprising a model box (1), a scaled model, a loading system (3), a bearing plate (4) and a test component;
the scaled-down model comprises a foundation (D) model, an existing building or structure (11) model and a light roadbed (2) model, wherein the foundation (D) model is filled in the model box (1), the existing building or structure (11) is arranged on the upper part or in the foundation (D) model, and the light roadbed (2) model and the existing building or structure (11) model are arranged at intervals;
the loading system (3) comprises a loading device, a pressure sensor (32) and a counterforce device (34), the loading device is located at the upper end of the bearing plate (4), the pressure sensor (32) is located at the upper end of the loading device, the counterforce device (34) is located at the upper end of the pressure sensor (32), two ends of the counterforce device (34) are placed on the ground, the bearing plate (4) is located at the upper end of the light roadbed (2) model, and the loading system (3) transmits simulated load to the light roadbed (2) model through the bearing plate (4);
the test components are arranged on the existing building or structure (11) model, the light roadbed (2) model and the bearing plate (4).
2. The equal-load replacement light roadbed bearing detection simulation device is characterized in that the light roadbed (2) model comprises composite light piles (21), U-shaped light grooves (22) and soil fillers (23), the composite light piles (21) comprise pile-forming light bodies (13) and composite reinforcement cages (12), the composite reinforcement cages (12) comprise vertical geogrids (121) arranged at intervals along the circumferential direction and annular geogrids (122) arranged at intervals along the vertical direction, the vertical geogrids (121) and the annular geogrids (122) are connected into a whole in an intersecting mode, mesh quadrangles are formed between every two adjacent vertical geogrids (121) and every two adjacent annular geogrids (122), the pile-forming light bodies (13) comprise light soil (224), and a protective layer (131) is arranged between the outer wall of each composite reinforcement cage (12) and the hole wall of a foundation (D) drilled hole, the composite light-weight piles (21) are arranged in a square shape.
3. The equal-load replacement light-weight roadbed bearing detection simulation device is characterized in that the U-shaped light-weight groove (22) comprises connecting steel bars (221), a steel bar net (222), a transverse geogrid (223) and light-weight soil (224), one end of each connecting steel bar (221) is anchored into the composite light-weight pile (21), the other end of each connecting steel bar (221) is fixedly connected with the steel bar net (222), the steel bar net (222) is arranged on the top of the composite light-weight pile (21), and the transverse geogrid (223) is arranged in a layered pull-through mode in the height direction.
4. The equal-load replacement light-weight roadbed bearing detection simulation device according to claim 1, wherein the loading system (3) further comprises a main beam (33), the main beam (33) is located between the pressure sensor (32) and the counterforce device (34), the counterforce device (34) comprises an anchor pile beam counterforce device, a ballast platform counterforce device or an anchor pile ballast combination counterforce device, and the loading device comprises a jack (31).
5. The equal-load replacement light roadbed bearing detection simulation device according to claim 1, wherein the test components comprise test piles (10), load sensors (5), soil pressure boxes (6), tension meters (7), displacement meters (8) and strain gauges (9), a group of the load sensors (5) and the soil pressure boxes (6) are buried in every two composite light piles (21) at the base of the U-shaped light groove (22), the load sensors (5) are located at the pile tops of the composite light piles (21), the soil pressure boxes (6) are arranged in the soil center between piles, one test pile (10) is selected in every two composite light piles (22) at the base of the U-shaped light groove (22), the tension meters (7) are arranged on the vertical geogrid (121) and the annular geogrid (122) of the test pile (10) at intervals in the pile depth direction, the displacement meter (8) is positioned on the top of the bearing plate (4), and the strain gauge (9) is positioned in the existing building or structure (11) model.
6. The equal-load replacement light-weight roadbed bearing detection simulation device according to claim 1, wherein the existing building or structure (11) model comprises a tunnel model, the light-weight roadbed (2) model is arranged above the tunnel model, the top of the tunnel model is provided with at least three displacement meters (8), and at least four strain gauges (9) are arranged at equal intervals along the axial direction of the tunnel model.
7. The equal-load replacement light-weight roadbed bearing detection simulation device is characterized in that the existing building or structure (11) model comprises a bridge model, the light-weight roadbed (2) model is arranged below the bridge girder body (113) and between two bridge piers (112), the bridge girder body (113) is provided with at least three displacement meters (8), and the strain gauges (9) are arranged at equal intervals along the axial direction of the bridge piers (112) and the axial direction of the bridge pile foundations (111).
8. The equal-load replacement light roadbed bearing detection simulation device according to claim 1, wherein the existing building or structure (11) model comprises an embankment model, the light roadbed (2) model is filled on one side or two sides of an embankment slope, the top surface of the embankment is provided with at least three displacement meters (8), and the soil pressure boxes (6) are arranged at equal intervals along the contact surface of the embankment slope and the light roadbed (2).
9. The implementation method for equal-load replacement light roadbed bearing detection is characterized by comprising the following steps:
s1: constructing a foundation (D) model in a layered manner, and constructing an existing building or a structure model (11) on the foundation (D) model;
s2: installing a tension meter (7) on the composite reinforcement cage (12), and drilling a hole on the foundation (D);
s3, feeding the composite reinforcement cage (12) into the drill hole;
s4: injecting light soil (224) into the drill hole until the drill hole is filled with the light soil (224), and embedding connecting steel bars (221) on the pile top in advance;
s5: installing a load sensor (5) and a soil pressure box (6), laying a layer of reinforcing mesh (222) on the top of the pile, and fixedly connecting the reinforcing mesh (222) with a connecting reinforcing steel bar (221);
s6: installing a tension meter (7) on the transverse geogrid (223), pouring light soil (224) in a layered mode, and laying the transverse geogrid (223) in a layered mode until the pouring of the U-shaped light groove (22) is completed;
s7: filling soil fillers (23) in layers until the top surface of the roadbed, laying a bearing plate (4), installing a displacement meter (8), and then sequentially installing a jack (31), a pressure sensor (32), a main beam (33) and a counterforce device (34);
s8: gradually applying load until the maximum design load capacity is reached, reading test data, and sorting and analyzing the test data;
s9: and (5) load is unloaded in a grading way.
10. The equal-load replacement light roadbed bearing detection implementation method according to claim 9, wherein the existing building or structure model (11) comprises a tunnel model or a bridge pile foundation (111) model, and in the step S1, when the foundation (D) model is constructed, the tunnel model or the bridge pile foundation (111) model is simultaneously arranged in the foundation (D), the tunnel model or the bridge pile foundation (111) model adopts a prefabricated structure, and the prefabricated structure is marked with a position and is pasted with a strain gauge (9).
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| CN113373992A (en) * | 2021-06-23 | 2021-09-10 | 唐春梅 | Roadbed settlement test platform for road and bridge transition section |
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