CN112538872B - Isolation pile foundation adjacent to high-speed railway bridge and pile loading construction model test system - Google Patents
Isolation pile foundation adjacent to high-speed railway bridge and pile loading construction model test system Download PDFInfo
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- CN112538872B CN112538872B CN202011285339.2A CN202011285339A CN112538872B CN 112538872 B CN112538872 B CN 112538872B CN 202011285339 A CN202011285339 A CN 202011285339A CN 112538872 B CN112538872 B CN 112538872B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
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- E02D33/00—Testing foundations or foundation structures
Abstract
The application relates to the technical field of geotechnical engineering and bridge engineering, and provides an isolation pile foundation and a pile loading construction model test system adjacent to a high-speed railway bridge. The system comprises a model test box system, a counterforce frame and a loading system. The model test box system comprises a model test box, a to-be-piled soil body material, a to-be-constructed isolation pile foundation and a high-speed railway bridge model, and can realize the independent and coupling action of the isolation pile foundation construction working condition, the piling construction working condition and the high-speed railway train operation vibration working condition; the counterforce frame can realize that the loading system can freely move along three axes X, Y, Z and provides supporting counterforce for the loading system; the loading system is used for applying uniform penetration load to the isolation pile foundation to be constructed or applying uniform vibration load to the loading contact of the track fastener. The application adopts a modular design, each functional module is relatively independent, the utilization rate of the test system is high, the working condition adaptability is strong, and an integrated test solution can be provided for relevant engineering problems and teaching and scientific research.
Description
Technical Field
The application relates to the technical field of geotechnical engineering and bridge engineering, in particular to an isolation pile foundation and pile loading construction model test system adjacent to a high-speed railway bridge.
Background
With the improvement of high-speed rail lines in China, the vibration load generated by train operation repeatedly acts for a long time in a high-speed rail bridge crossing zone, and influences on the bridge structure and the surrounding environment. For large-scale construction projects such as high-speed rail vehicle foundations and the like, large-area and repeated accumulation loads of construction equipment, soil bodies and the like can be generated due to channel change and site accumulation, and production, offices, auxiliary buildings and the like in a constructed construction site can also generate a composite accumulation effect on adjacent areas. The stacking can affect the original stress of the stratum, and the generated additional stress can cause the compression of the surrounding soil body, thereby generating vertical and horizontal deformation and affecting the safety of other buildings and structures in adjacent bridges and sites.
When the construction is carried out at a place close to a building such as a high-speed railway bridge, in order to prevent adverse effects on adjacent buildings and the environment in the construction process, usually, an isolation pile is arranged between the building and a construction site to meet the protection requirement. The isolation pile is used as one of main methods for reinforcing the stratum in the construction stage and reducing the disturbance of the construction to the surrounding environment, and is widely applied to engineering projects such as foundation pit excavation, pile loading construction and the like, and the related engineering demand is large.
In actual engineering, the complex problem of superposition of multiple working conditions is often faced, and the problems are often difficult to study through theoretical analysis and numerical analysis, so that the actual engineering needs to be finely simulated by means of an indoor model test. However, most of the existing physical model test systems can only consider a single construction working condition, and no model test system which can consider the stacking construction, the isolation pile construction and the high-speed rail vibration coupling action exists. In order to solve the problem of meeting the working conditions, an integrated test system is urgently needed to meet the scientific research requirements of related projects.
Disclosure of Invention
The purpose of this application lies in: make up and keep apart the not enough of pile foundation construction, pile and carry, the relevant compound construction operating mode project model test system of high-speed railway vibration, provide the experimental solution of an integration, make it can satisfy the scientific research demand of keeping apart the pile foundation construction, pile and carry the effect and the relevant engineering test simulation of high-speed railway operation vibration.
In order to achieve the purpose, the application provides the following technical scheme:
the utility model provides an keep apart pile foundation and pile of neighbouring high-speed railway bridge carries construction model test system which characterized in that: the system comprises a model test box system, a counterforce frame and a loading system.
The model test box system consists of a model test box, a to-be-piled soil body material, a to-be-constructed isolation pile foundation and a high-speed railway bridge model;
furthermore, the model test box comprises a plurality of upright posts, a bottom frame, a top ring beam, a plurality of groups of X-shaped ribs, a plurality of side plates and a bottom plate; the plurality of upright columns, the bottom frame and the top ring beam form a rigid frame of the main body of the model test box; the side plates are made of materials with higher rigidity and are hermetically arranged on the side surface of the model test box; the X-shaped rib groups are of rigid structures, are arranged on the outer sides of the side plates and are fixedly connected with a rigid frame consisting of the upright posts, the bottom frame and the top ring beam, and are used for reinforcing the side plates and ensuring the boundary constraint fixation and strength and rigidity requirements of the soil sample material; the bottom plate is made of a material with higher rigidity and is hermetically arranged on the bottom surface of the model test box; the model test box can be filled with soil sample materials for later stage test;
the soil mass material to be loaded can be prepared by conversion of similarity ratio according to the physical and mechanical properties of the actual loading material and is placed at a specified loading position;
the isolation pile foundation to be constructed can be manufactured by converting a similarity ratio according to actual geometric dimension and physical and mechanical properties and is penetrated into a soil body according to different construction methods and construction parameter requirements;
the high-speed rail bridge deck model system comprises a plurality of bridge pile foundations, a plurality of bearing platforms, a plurality of piers, a bridge deck and a plurality of track fastener loading contacts, and is used for finely simulating the actual high-speed rail bridge deck structure;
the bridge pile foundation, the bearing platform, the piers and the bridge floor are manufactured through similarity ratio conversion according to actual geometric dimensions and physical mechanical properties, the bridge pile foundation is pre-buried in a soil sample material, the bearing platform and the piers are sequentially and rigidly connected upwards, and finally the bridge floor is lapped upwards; the track fastener loading contact is of a short column-shaped rigid structure, is arranged at the top of the bridge floor, is distributed symmetrically in multiple rows and is used for uniformly transmitting the upper vibration load to the bridge floor.
The counterforce frame comprises a frame base, a plurality of vertical frames, a plurality of longitudinal beams, a plurality of cross beams, a plurality of transmission blocks, a plurality of connecting ribs, a plurality of inclined struts, a plurality of X axial guide rails, a plurality of Y axial guide rails and a plurality of Z axial guide rails;
furthermore, the frame base, the plurality of vertical frames, the plurality of longitudinal beams and the plurality of cross beams are made of rigid materials with I-shaped cross sections; the connecting ribs and the inclined struts are arranged between the frame base and the vertical frames and are fixedly connected with the vertical frames through the connecting plates and the bolts, so that the integral strength of the structure formed by the frame base and the vertical frames is improved; the plurality of Z-axis guide rails are arranged on the side surfaces of the plurality of vertical frames and are in sliding connection with the plurality of longitudinal beams, so that the longitudinal beams can move along the axial direction of the vertical frames; the Y-axis guide rails are arranged at the tops of the longitudinal beams and are in sliding connection with the cross beams, so that the cross beams can move along the axial direction of the longitudinal beams; the plurality of X-axis guide rails are positioned at the bottoms of the plurality of cross beams and are in sliding connection with the plurality of transmission blocks, so that the plurality of transmission blocks can move along the axial direction of the cross beams; through a plurality of X axial guide rail, a plurality of Y axial guide rail and a plurality of Z axial guide rail, can realize that a plurality of transmission piece freely removes along X, Y, Z triaxial.
The loading system comprises a plurality of servo actuators, a plurality of servo actuator bases, a plurality of loading distribution beams and a plurality of fixing bolts and is used for applying a penetration load to the isolated pile foundation to be constructed or applying a vibration load to the high-speed rail bridge deck model system;
furthermore, in the plurality of servo actuators, each servo actuator is provided with a servo actuator base and a loading distribution beam, the servo actuators are hinged with the servo actuator bases, and the servo actuators are fixedly connected with the loading distribution beams; the servo actuator bases are connected with the transmission block bottom plates of the counter-force frame through fixing bolts; the plurality of loading distribution beams are of rigid beam structures and are used for applying uniform injection load to the to-be-constructed isolation pile foundation or applying uniform vibration load to the loading contact of the track fastener.
Compared with the prior art, the utility model relates to an isolation pile foundation and pile load construction model test system of neighbouring high-speed railway bridge divides the model test incasement portion into three regions, can realize row's pile construction, pile load construction, the test of three kinds of operating modes of high-speed railway operation vibration respectively. The construction planning isolation pile foundation in the pile arrangement construction working condition can adopt different pile types, and the injection construction is sequentially realized under the injection load action of the servo actuator; the stacking construction working condition is realized by stacking construction soil sample materials at preset positions in a grading manner; the vibration working condition of the high-speed rail train operation relates to the process that a prefabricated high-speed rail bridge model is buried in a soil sample material, and vibration generated by the high-speed rail train operation is simulated by applying vibration load on a bridge floor through a loading system. According to the test area divided by the system, multi-working-condition coupling tests can be synchronously carried out, and the multi-working-condition coupling tests comprise pile arrangement construction and high-speed rail operation vibration dual-working-condition coupling tests, pile loading construction and high-speed rail operation vibration dual-working-condition coupling tests, pile arrangement construction and pile loading construction dual-working-condition coupling tests, and pile arrangement construction, pile loading construction and high-speed rail operation vibration three-working-condition coupling tests.
According to the technical scheme, the method has the following advantages:
1. the method and the device can realize the tests of the isolated pile row pile construction, the pile loading construction and the high-speed rail train operation vibration working condition, provide an integrated solution for the composite construction working condition, and have higher utilization rate of a test system;
2. the provided counterforce frame can control and adjust the loading position, different materials can be selected for the isolation pile and the pile load according to the actual engineering, and other loading devices can be replaced and connected through the transmission block on the cross beam, so that the working condition adaptability of the test system is strong;
3. and by adopting a modular design, each functional module is relatively independent, and the maintenance and the function expansion in the future are facilitated.
Drawings
FIG. 1 is a schematic structural diagram of an overall scheme of a model test system provided in an embodiment of the present application;
FIG. 2 is a schematic structural diagram of a model test box system in a model test system according to an embodiment of the present disclosure;
fig. 3 is a schematic plan view of an internal structure of a model test box system in a model test system according to an embodiment of the present application;
FIG. 4 is a schematic structural diagram of a bridge model in a model test system provided in an embodiment of the present application, in which (a) a front view and (b) a top view are shown;
FIG. 5 is a schematic structural diagram of a reaction frame in a model test system according to an embodiment of the present disclosure;
FIG. 6 is a schematic view of a connection structure of a brace and a connecting rib in a model test system according to an embodiment of the present disclosure;
FIG. 7 is a schematic structural diagram of a loading system in a model test system according to an embodiment of the present application;
FIG. 8 is a schematic view of a cross-sectional connection structure of an X-axis guide rail in a model test system provided in an embodiment of the present application;
FIG. 9 is a schematic view of a cross-sectional connection structure of a Y-axis guide rail in a model test system according to an embodiment of the present disclosure;
fig. 10 is a schematic view of a cross-sectional connection structure of a Z-axis guide rail in a model test system provided in an embodiment of the present application.
Description of the reference numerals
1 is a model test box system;
101 is a model test box, 102 is a simulated-loading soil body material, 103 is a simulated-construction isolation pile foundation, and 104 is a high-speed railway bridge model;
1011 is a column, 1012 is a bottom frame, 1013 is a top ring beam, 1014 is an X-shaped rib, 1015 is a side plate, 1016 is a bottom plate;
1041 is a bridge pile foundation, 1042 is a bearing platform, 1043 is a pier, 1044 is a bridge floor, 1045 is a track fastener loading contact;
2 is a counterforce frame;
201 is a frame base, 202 is a vertical frame, 203 is a longitudinal beam, 204 is a cross beam, 205 is a transmission block, 206 is a connecting rib, 207 is an inclined strut, 208 is an X axial guide rail, 209 is a Y axial guide rail, and 210 is a Z axial guide rail;
2041 is a beam I, 2042 is a beam II;
2051 is a transmission block bottom plate;
2071 is a connecting plate, and 2072 is a bolt;
3 is a loading system;
Detailed Description
The technical solutions provided in the present application will be further described with reference to the following specific embodiments and accompanying drawings. The advantages and features of the present application will become more apparent in conjunction with the following description.
It should be noted that the embodiments of the present application have a better implementation and are not intended to limit the present application in any way. The technical features or combinations of technical features described in the embodiments of the present application should not be considered as being isolated, and they may be combined with each other to achieve a better technical effect. The scope of the preferred embodiments of this application may also include additional implementations, and this should be understood by those skilled in the art to which the embodiments of this application pertain.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
The drawings in the present application are in simplified form and are not to scale, but rather are provided for convenience and clarity in describing the embodiments of the present application and are not intended to limit the scope of the application. Any modification of the structure, change of the ratio or adjustment of the size of the structure should fall within the scope of the technical disclosure of the present application without affecting the effect and the purpose of the present application. And the same reference numbers appearing in the various drawings of the present application designate the same features or components, which may be employed in different embodiments.
As shown in fig. 1, an isolated pile foundation and pile loading construction model test system adjacent to a high-speed railway bridge comprises: a model test chamber system 1, a reaction frame 2, and a loading system 3.
As shown in fig. 2 and 3, the model test box system 1 is composed of a model test box 101, a to-be-piled soil body material 102, a to-be-constructed isolation pile foundation 103 and a high-speed railway bridge model 104;
the model test box 101 is a rigid frame of a main body of the model test box 101, and four side plates 1015 and a bottom seal mounting bottom plate 1016 are arranged on the side faces in a sealing manner, wherein the rigid frame of the main body of the model test box 101 is formed by four upright columns 1011, a bottom frame 1012 and a top ring beam 1013; four groups of X-shaped ribs 1014 are arranged on the outer sides of the four side plates 1015 and fixedly connected with a rigid frame consisting of four upright posts 1011, a bottom frame 1012 and a top ring beam 1013, and are used for reinforcing the side plates 1015 and ensuring the boundary constraint fixation and strength and rigidity requirements of the soil sample material; the model test box 101 can be filled with soil sample material for later tests.
As shown in fig. 4, the high-speed rail bridge model 104 includes twenty-four bridge pile foundations 1041, three bearing platforms 1042, three piers 1043, a bridge deck 1044, and thirty rail fastener loading contacts 1045, and is used for fine simulation of an actual high-speed rail structure; twenty-four bridge pile foundations 1041 are embedded in the soil sample material, three bearing platforms 1042 are respectively and rigidly connected with the twenty-four bridge pile foundations 1041, three piers 1043 are rigidly connected with the three bearing platforms 1042, and a bridge deck 1044 is lapped on the three piers 1043; thirty rail fastener loading contacts 1045 are symmetrically arranged in two rows on the top of the bridge deck 1044 and are used for uniformly transmitting the upper vibration load to the bridge deck 1044.
As shown in fig. 5 and 6, the reaction frame 2 includes a frame base 201, four vertical frames 202, two longitudinal beams 203, two cross beams 204, two transmission blocks 205, four connection ribs 206, four diagonal braces 207, two X axial guide rails 208, two Y axial guide rails 209, and two Z axial guide rails 210;
the four connecting ribs 206 and the four diagonal braces 207 are arranged between the frame base 201 and the four vertical frames 202 and are fixedly connected through sixteen connecting plates 2071 and sixty-four bolts 2072, so that the integral strength of the structure formed by the frame base 201 and the four vertical frames 202 is improved; the two Z-axis guide rails 210 are arranged on the side surfaces of the four vertical frames 202 and are connected with the two longitudinal beams 203 in a sliding manner (see fig. 10), so that the longitudinal beams 203 can move along the axial direction of the vertical frames 202; two Y-axis guide rails 209 are arranged at the tops of the two longitudinal beams 203 and are connected with the two cross beams 204 in a sliding manner (see fig. 9), so that the cross beams 204 can move along the axial direction of the longitudinal beams 203; the two X-axis guide rails 208 are positioned at the bottoms of the two cross beams 204 and are connected with the two transmission blocks 205 in a sliding manner (see FIG. 8), so that the two transmission blocks 205 can move along the axis direction of the cross beams 204; two transmission blocks 205 can freely move along three axes X, Y, Z through two X-axis guide rails 208, two Y-axis guide rails 209 and two Z-axis guide rails 210; the drive block floor 2051 is located at the bottom of the drive block 205 and may be used to connect to the loading system 3.
As shown in fig. 7, the loading system 3 includes two servo actuators 301, two servo actuator bases 302, eight fixing bolts 303, and two loading distribution beams 304; each servo actuator base 302 is connected with the transmission block bottom plate 2051 through four fixing bolts 303; by placing the load distribution beam 304 between the servo actuators 301 and the deck 1044 rail fastener load contacts 1045.
In a preferred embodiment, through holes may be formed in the longitudinal beams 203, the cross beams 204, the transmission blocks 205, and the servo actuator base 302 for inserting cables, the X-axis guide rail 208, the Y-axis guide rail 209, the Z-axis guide rail 210, the servo actuator 301, and the external power source are connected through the cables, and the power of the above components is turned on or off by controlling a switch of the external power source.
The application provides a keep apart pile foundation and pile load construction model test system of neighbouring high-speed railway bridge, its working method is as follows:
the first embodiment is as follows: row pile penetration construction test
The longitudinal beams 203 of the control counterforce frame 2 move along a Z-axis guide rail 210, the I-shaped cross beam 2041 moves along a Y-axis guide rail 209, and the transmission block 205 moves along an X-axis guide rail 208, so that the servo actuator 301 connected with the I-shaped cross beam 2041 is moved to the pile position of the isolation pile foundation 103 to be constructed; lifting the servo actuator 301 to a certain height, erecting the first to-be-constructed isolation pile foundation 103, and determining that the pipe pile is vertical to prevent eccentric compression; then, pressurizing is carried out through the loading system 3, the servo actuator 301 slowly descends at a constant speed, and the first isolation pile foundation 103 to be constructed is pushed to be pressed into the soil; if the stroke of the servo actuator 301 is insufficient, the servo actuator can be pressed in for multiple times, and after the first planned construction isolation pile foundation 103 is completed, the follow-up planned construction isolation pile foundation 103 is sequentially completed.
Example two: pile loading construction test
Dividing and marking a pseudo-stacking range on the surface of a soil sample material in a target test area in a model test box 101, stacking a pseudo-stacking soil body material 102 to a preset position, and finishing the application of a first-stage stacking load; and then continuously stacking the load of the soil sample material until the preset height is reached, and finishing the second-level stacking and the third-level stacking.
Example three: vibration test for high-speed rail operation
Before the model test box 101 is filled with soil sample materials, the inner wall of the side plate 1015 is marked with the burying position of the high-speed rail bridge model 104, when soil is filled to the position near the marked area, the high-speed rail bridge model 104 is placed, the soil is filled to a preset elevation under the condition that the model is vertical, the high-speed rail bridge bearing platform 1042 is covered, and when the soil is filled to the position of the bridge pile foundation 1041, the soil sample materials near the bridge pile foundation 1041 are tamped; placing the loading distribution beam 304 in a track fastener loading contact 1045 of a bridge deck 1044 and fixing, controlling the longitudinal beam 203 of the counterforce frame 2 to move along the Z-axis guide rail 210, the No. II cross beam 2042 to move along the Y-axis guide rail 209, and the transmission block 205 to move along the X-axis guide rail 208, moving the servo actuator 301 connected with the No. II cross beam 2042 onto the loading distribution beam 304, and determining the accurate loading position from each direction; the servo actuator 301 is pressed down into contact with the load distribution beam 304 by the loading system 3, applying a vibratory load.
Example four: pile row penetration and high-speed rail operation vibration dual-working-condition coupling test
According to the specific method of the third embodiment, firstly, a high-speed rail bridge model 104 is buried in a preset position, filling work of a soil sample material of a model test box 101 is completed, and a test area of an isolation pile foundation 103 to be constructed is preliminarily determined and divided; marking the construction pile position of each row of piles in the divided test area according to the construction design drawing, and controlling the servo actuator 301 to move to the position of the first planned construction isolation pile foundation 103 to wait for subsequent construction; secondly, according to the specific steps described in the third embodiment, the loading distribution beam 304 is fixed to the track fastener loading contact 1045 of the bridge deck 1044, the servo actuator 301 of the No. II cross beam 2042 is used to apply a vibration load, and the load is kept in a continuously loaded state, that is, the operating vibration working condition of the high-speed train is kept; according to the steps of the first embodiment, the servo actuator 301 of the I-shaped beam 2041 is pressurized, and pile arrangement penetration construction is started at a preset pile position in a construction area of the to-be-constructed isolation pile foundation 103, so that a double-working-condition coupling test of pile arrangement penetration and high-speed rail operation vibration is realized.
Example five: dual-working-condition coupling test for stacking construction and high-speed rail operation vibration
According to the method of the third embodiment, firstly, a high-speed rail bridge model 104 is buried to a preset position, the filling work of the soil sample material of the model test box 101 is completed, and the stacking range of the soil mass material to be stacked 102 is divided and marked on the surface of the soil sample material; secondly, according to the specific steps described in the third embodiment, the loading distribution beam 304 is fixed to the track fastener loading contact 1045, the servo actuator 301 connected with the No. II cross beam 2042 is used for loading a vibration load, and a load continuous application state is kept, that is, a working condition of high-speed rail operation vibration is kept; and then, stacking the soil mass material 102 to be stacked step by step to a target range, and starting graded stacking construction to realize dual-working-condition coupling tests of stacking construction and high-speed rail operation vibration.
Example six: double-working-condition coupling test for row pile injection and pile loading construction
Firstly filling a soil sample material in a model test box 101 to a preset height, and dividing and marking a stacking range of a soil mass material to be stacked 102, a test area of an isolation pile foundation 103 to be constructed and each row of pile construction pile positions on the surface of the soil sample material; controlling the servo actuator 301 connected with the I-shaped cross beam 2041 to move to the position of the first isolation pile foundation 103 to be constructed to wait for subsequent construction; because both working conditions need manual continuous operation, in the double-working-condition test process, the preparation work is completed by matching two groups of test personnel to synchronously construct according to the specific steps described in the first embodiment and the second embodiment, and the double-working-condition coupling test of row pile penetration and pile loading construction is realized.
Example seven: pile row injection, pile loading construction and high-speed rail operation vibration three-working-condition coupling test
According to the method of the third embodiment, firstly, a high-speed rail bridge model 104 is buried to a preset position, and the filling work of the soil sample material of the model test box 101 is completed; dividing and marking the stacking range of the soil material to be stacked 102, the test area of the isolation pile foundation to be constructed 103 and the construction pile position of each row of piles on the surface of the soil sample material; controlling the servo actuator 301 connected with the I-shaped cross beam 2041 to move to the position of the first isolation pile foundation 103 to be constructed to wait for subsequent construction; secondly, according to the specific steps described in the third embodiment, the loading distribution beam 304 is fixed to the track fastener loading contact 1045, the servo actuator 301 of the No. II cross beam 2042 is used to apply a vibration load, and the load is kept in a continuous loading state, that is, the vibration working condition of the high-speed train in operation is kept; and then, two groups of testers are matched to synchronously carry out the construction of two working conditions of row pile injection and stacking load construction according to the specific steps in the first embodiment and the second embodiment respectively, so that the three working condition coupling tests of row pile injection, stacking load construction and high-speed rail operation vibration are realized.
The above description is only illustrative of the preferred embodiments of the present application and is not intended to limit the scope of the present application in any way. Any changes or modifications made by those skilled in the art based on the above disclosure should be considered as equivalent effective embodiments, and all the changes or modifications should fall within the protection scope of the technical solution of the present application.
Claims (1)
1. The utility model provides an keep apart pile foundation and pile of neighbouring high-speed railway bridge carries construction model test system which characterized in that: the system comprises a model test box system (1), a counterforce frame (2) and a loading system (3), and can realize independent and coupling action tests of an isolation pile foundation construction working condition, a pile loading construction working condition and a high-speed train operation vibration working condition;
the model test box system (1) consists of a model test box (101), a to-be-piled soil body material (102), a to-be-constructed isolation pile foundation (103) and a high-speed railway bridge model (104); the model test box (101) comprises a plurality of upright columns (1011), a bottom frame (1012), a top ring beam (1013), a plurality of groups of X-shaped ribs (1014), a plurality of side plates (1015) and a bottom plate (1016); the plurality of upright columns (1011), the bottom frame (1012) and the top ring beam (1013) jointly form a rigid frame of a main body of the model test box (101); the side plates (1015) are made of materials with higher rigidity and are hermetically arranged on the side surface of the model test box (101); the plurality of groups of X-shaped ribs (1014) are rigid structures, are arranged on the outer sides of the plurality of side plates (1015), are fixedly connected with a rigid frame consisting of the plurality of upright columns (1011), the bottom frame (1012) and the top ring beam (1013), and are used for reinforcing the side plates (1015) and ensuring the boundary constraint fixation and the strength and rigidity requirements of the soil sample material; the bottom plate (1016) is made of a material with higher rigidity and is hermetically arranged on the bottom surface of the model test box (101); the model test box (101) can be filled with soil sample materials for later-stage tests; the soil mass material (102) to be loaded can be prepared by conversion of similarity ratio according to the physical and mechanical properties of the actual loaded material and is placed at a specified loading position; the isolation pile foundation (103) to be constructed can be manufactured by converting a similarity ratio according to actual geometric dimension and physical mechanical properties and is penetrated into a soil body according to different construction methods and construction parameter requirements; the high-speed rail bridge deck model system comprises a plurality of bridge pile foundations (1041), a plurality of bearing platforms (1042), a plurality of piers (1043), a bridge deck (1044) and a plurality of track fastener loading contacts (1045), and is used for finely simulating an actual high-speed rail structure; the bridge pile foundation (1041), the bearing platform (1042), the piers (1043) and the bridge floor (1044) are manufactured through similar ratio conversion according to actual geometric dimension and physical and mechanical properties, the bridge pile foundation (1041) is pre-buried in a soil sample material, the bearing platform (1042) and the piers (1043) are sequentially and rigidly connected upwards, and finally the bridge floor (1044) is lapped upwards; the track fastener loading contacts (1045) are short column-shaped rigid structures, are arranged at the top of the bridge deck (1044) and are symmetrically distributed in multiple rows and are used for uniformly transmitting the upper vibration load to the bridge deck (1044);
the reaction frame (2) comprises a frame base (201), a plurality of vertical frames (202), a plurality of longitudinal beams (203), a plurality of cross beams (204), a plurality of transmission blocks (205), a plurality of connecting ribs (206), a plurality of inclined struts (207), a plurality of X axial guide rails (208), a plurality of Y axial guide rails (209) and a plurality of Z axial guide rails (210); the frame base (201), the plurality of vertical frames (202), the plurality of longitudinal beams (203) and the plurality of cross beams (204) are made of rigid materials with I-shaped cross sections; the connecting ribs (206) and the inclined struts (207) are arranged between the frame base (201) and the vertical frames (202) and are fixedly connected with the frame base (201) and the vertical frames (202) through the connecting plates (2071) and the bolts (2072) to improve the integral strength of the structure formed by the frame base (201) and the vertical frames (202); the plurality of Z-axis guide rails (210) are arranged on the side surfaces of the plurality of vertical frames (202) and are in sliding connection with the plurality of longitudinal beams (203), so that the longitudinal beams (203) can move along the axial direction of the vertical frames (202); the Y-axis guide rails (209) are arranged at the tops of the longitudinal beams (203) and are in sliding connection with the cross beams (204), so that the cross beams (204) can move along the axial direction of the longitudinal beams (203); the X-axis guide rails (208) are positioned at the bottoms of the cross beams (204) and are in sliding connection with the transmission blocks (205), so that the transmission blocks (205) can move along the axial direction of the cross beams (204); through a plurality of X axial guide rails (208), a plurality of Y axial guide rails (209) and a plurality of Z axial guide rails (210), a plurality of transmission blocks (205) can freely move along three axes X, Y, Z;
the loading system (3) comprises a plurality of servo actuators (301), a plurality of servo actuator bases (302), a plurality of loading distribution beams (304) and a plurality of fixing bolts (303), and is used for applying a penetration load to the isolation pile foundation (103) to be constructed or applying a vibration load to a high-speed rail bridge floor model system; in the plurality of servo actuators (301), each servo actuator (301) is provided with a servo actuator base (302) and a loading distribution beam (304), the servo actuators (301) are hinged with the servo actuator bases (302), and the servo actuators (301) are fixedly connected with the loading distribution beams (304); the servo actuator bases (302) are connected with the transmission block bottom plates (1051) of the reaction frame (2) through fixing bolts (303); the loading distribution beams (304) are rigid beam structures and are used for applying uniform penetration load to the isolation pile foundation (103) to be constructed or applying uniform vibration load to the loading contact (1045) of the rail fastener;
based on the system, the working mode is realized:
implementing one step: row pile penetration construction test
The longitudinal beam (203) of the control counterforce frame (2) moves along a Z-axis guide rail (210), the I-shaped cross beam (2041) moves along a Y-axis guide rail (209), the transmission block (205) moves along an X-axis guide rail (208), and the servo actuator (301) connected with the I-shaped cross beam (2041) is moved to the pile position of the isolation pile foundation (103) to be constructed; lifting the servo actuator (301) to a certain height, erecting the first to-be-constructed isolation pile foundation (103), determining that the pipe pile is vertical, and preventing eccentric compression; then, pressurization is carried out through a loading system (3), a servo actuator (301) slowly descends at a constant speed, and a first isolation pile foundation (103) to be constructed is pushed to be pressed into the soil; if the stroke of the servo actuator (301) is insufficient, pressing in for multiple times is carried out, and after the first isolation pile foundation (103) to be constructed is injected, the subsequent injection construction of the isolation pile foundation (103) to be constructed is sequentially completed; or
The second implementation: pile loading construction test
Dividing and marking a pseudo-stacking range on the surface of a soil sample material of a target test area in a model test box (101), stacking a pseudo-stacking soil body material (102) to a preset position, and finishing the application of a first-stage stacking load; then, continuously stacking the load of the soil sample material until the preset height is reached, and finishing the second-level stacking and the third-level stacking; or
And (3) implementation: vibration test for high-speed rail operation
Before the model test box (101) is filled with soil sample materials, the inner wall of the side plate (1015) is marked with the burying position of the high-speed rail bridge model (104), when soil is filled to the position near the marked area, the high-speed rail bridge model (104) is placed, the soil is filled to a preset elevation under the condition that the model is vertical, the high-speed rail bridge bearing platform (1042) is covered, and when the model test box is filled to the position of the bridge pile foundation (1041), the soil sample materials near the bridge pile foundation (1041) are tamped; placing and fixing a loading distribution beam (304) in a track fastener loading contact (1045) of a bridge deck (1044), controlling a longitudinal beam (203) of a counterforce frame (2) to move along a Z-axis guide rail (210), a No. II cross beam (2042) to move along a Y-axis guide rail (209), a transmission block (205) to move along an X-axis guide rail (208), moving a servo actuator (301) connected with the No. II cross beam (2042) onto the loading distribution beam (304), and determining accurate loading position from each direction; pressing down the servo actuator (301) to be in contact with the loading distribution beam (304) through the loading system (3) to apply vibration load; or
And (4) implementation: pile row penetration and high-speed rail operation vibration dual-working-condition coupling test
According to the third implementation method, firstly, a high-speed rail bridge model (104) is buried to a preset position, filling work of a soil sample material of a model test box (101) is completed, and a test area of an isolation pile foundation (103) to be constructed is preliminarily determined and divided; marking the construction pile position of each row of piles in the divided test area according to the construction design drawing, and controlling the servo actuator (301) to move to the position of the first planned construction isolation pile foundation (103) to wait for subsequent construction; secondly, fixing the loading distribution beam (304) to a track fastener loading contact (1045) of a bridge deck (1044) according to the specific steps of implementing the third step, applying a vibration load by using a servo actuator (301) of a No. II cross beam (2042), and keeping the load in a continuous loading state, namely keeping the operation vibration working condition of the high-speed train; according to the implementation of the step I, the servo actuator (301) of the I-shaped cross beam (2041) is pressurized, and pile arrangement penetration construction is started at a preset pile position of a construction area of the to-be-constructed isolation pile foundation (103), so that a double-working-condition coupling test of pile arrangement penetration and high-speed rail operation vibration is realized; or
And fifthly, implementation: dual-working-condition coupling test for stacking construction and high-speed rail operation vibration
According to the method for implementing the third step, firstly, a high-speed rail bridge model (104) is buried to a preset position, the filling work of the soil sample material of the model test box (101) is completed, and the stacking range of the soil mass material (102) to be stacked is divided and marked on the surface of the soil sample material; secondly, according to the third concrete steps, fixing a loading distribution beam (304) on a track fastener loading contact (1045), loading a vibration load by using a servo actuator (301) connected with a No. II cross beam (2042), and keeping a load continuous application state, namely keeping a working condition of high-speed rail operation vibration; then, piling the soil body material (102) to be piled up step by step to the target range, starting grading piling construction, and realizing piling construction and high-speed rail operation vibration dual-working-condition coupling test; or
And sixthly, implementation: double-working-condition coupling test for row pile injection and pile loading construction
Firstly filling a soil sample material in a model test box (101) to a preset height, and dividing and marking a stacking range of a soil mass material (102) to be stacked on the surface of the soil sample material, a test area of an isolation pile foundation (103) to be constructed and each row of pile construction pile positions; controlling a servo actuator (301) connected with the I-shaped cross beam (2041) to move to the position of the first planned construction isolation pile foundation (103) to wait for subsequent construction; because both working conditions need manual continuous operation, in the double-working-condition test process, after two preparation works of marking the pile loading range and moving the servo actuator (301) to the position of the first planned construction isolation pile foundation (103) are completed, two groups of testers are required to cooperate to carry out construction synchronously according to the specific steps of implementing the first step and implementing the second step respectively so as to realize the double-working-condition coupling test of pile arrangement penetration and pile loading construction; or
The implementation seven comprises the following steps: pile row injection, pile loading construction and high-speed rail operation vibration three-working-condition coupling test
According to the method of the third implementation, firstly, a high-speed rail bridge model (104) is buried to a preset position, and the filling work of the soil sample material of the model test box (101) is completed; dividing and marking a stacking range of a soil mass material (102) to be stacked, a test area of an isolation pile foundation (103) to be constructed and each row of pile construction pile positions on the surface of the soil sample material; controlling a servo actuator (301) connected with the I-shaped cross beam (2041) to move to the position of the first planned construction isolation pile foundation (103) to wait for subsequent construction; secondly, fixing a loading distribution beam (304) on a track fastener loading contact (1045) according to the specific steps of implementing the third step, applying a vibration load by using a servo actuator (301) of a No. II cross beam (2042), and keeping the load in a continuous loading state, namely keeping the operation vibration working condition of the high-speed train; and then, two groups of testers are matched to synchronously carry out the construction of two working conditions of row pile injection and pile loading construction according to the specific steps of implementing the first step and implementing the second step respectively, and the coupling test of three working conditions of row pile injection, pile loading construction and high-speed rail operation vibration is realized overall.
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