CN110954352A - Energy underground structure model experiment test system - Google Patents
Energy underground structure model experiment test system Download PDFInfo
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- CN110954352A CN110954352A CN201911328406.1A CN201911328406A CN110954352A CN 110954352 A CN110954352 A CN 110954352A CN 201911328406 A CN201911328406 A CN 201911328406A CN 110954352 A CN110954352 A CN 110954352A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/002—Thermal testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/007—Subject matter not provided for in other groups of this subclass by applying a load, e.g. for resistance or wear testing
Abstract
The invention provides an energy underground structure model experiment test system, which comprises: the model unit comprises a model box containing soil for test and an energy underground structure model arranged in the soil for test; the temperature loading unit comprises a water tank, a water pump, a temperature circulation controller and a heat exchange tube which are sequentially communicated through a pipeline, and the heat exchange tube is arranged in the energy underground structure model; an air loading unit comprising an air fluid for applying different temperatures and/or velocities to the energy source subsurface structure model; the detection unit comprises a temperature sensor array arranged in the test soil, and a temperature sensor and a strain sensor arranged in the energy underground structure model, wherein the temperature sensor and the strain sensor are respectively connected with a demodulator, and the demodulator is connected with a computer. Compared with other model tests, the energy pile and the energy tunnel can be tested respectively, and the energy pile and the energy tunnel can also be tested simultaneously.
Description
Technical Field
The invention relates to the technical field of experimental tests of underground engineering structure models, in particular to an energy underground structure model experimental test system.
Background
Energy underground structure as a neotype underground structure, can combine together ground source heat pump heat exchange tube pipe network and traditional underground structure, and the inside of underground structure provides the space for the heat exchange tube, does not occupy the underground area, practices thrift the soil, compares the ground source heat pump moreover and has reduced the well drilling link, has also reduced the grout backfill process of heat transfer well simultaneously. In addition, the technology reduces the construction cost and shortens the construction time. Similar to a ground source heat pump, the heat exchange of the upper structure of the building and the underground soil body is realized by utilizing the flow of the heat-carrying fluid in the heat exchange tube.
Along with the utilization of shallow geothermal energy developed by underground space, underground structure groups are densely distributed, and the group effect of building foundation piles and subway tunnel structures is the normal state of urban underground structures. Therefore, energy piles and energy tunnels are mainly used for the research of the energy underground structure. The research on the aspect of energy piles is relatively more, and the research on energy tunnels is relatively less. Because the energy tunnel is different from other energy underground structures in that the influence of air convection heat transfer is also considered, for the research of the energy tunnel, the heat exchange between the structure and the soil body is also considered compared with the energy pile, and the heat exchange between the tunnel structure and the internal air is also considered. Energy piles are affected by temperature changes, which can produce non-uniform temperature strains and stresses. Moreover, most of the current research is limited to a single underground structure, such as an energy pile or an energy tunnel, and the group effect of structures such as piles and tunnels in intensive underground engineering is not considered. The prior art also lacks a corresponding model experiment test system.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide an energy underground structure model experiment test system, and aims to solve the problem that an experiment test system capable of simulating group effects of structures such as piles, tunnels and the like in dense underground engineering is lacked in the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows:
an energy underground structure model experiment test system, comprising:
the model unit comprises a model box containing soil for test and an energy underground structure model arranged in the soil for test;
the temperature loading unit comprises a water supply device, a temperature circulation controller and a heat exchange piece which are sequentially communicated through a pipeline, and the heat exchange piece is arranged in the energy underground structure model;
an air loading unit comprising an air fluid for applying different temperatures and/or velocities to the energy source subsurface structure model;
the detection unit comprises a temperature sensor array arranged in the test soil, and a temperature sensor and a strain sensor arranged in the energy underground structure model, wherein the temperature sensor and the strain sensor are respectively connected with a demodulator, and the demodulator is connected with a computer.
Optionally, the energy underground structure model experiment testing system includes an energy pile model and/or an energy tunnel model.
Optionally, the energy underground structure model experiment testing system is characterized in that holes are formed in two side walls of the model box respectively, and fixing portions are arranged on the holes.
Optionally, the energy underground structure model experiment testing system is provided with a flowmeter on a pipeline connecting the temperature cycle controller and the energy underground structure model.
Optionally, the energy underground structure model experiment testing system, wherein when the energy underground structure model is an energy pile model, a pile head of the energy pile model is provided with a displacement meter, and the displacement meter is connected with a displacement collector.
Optionally, the energy source underground structure model experiment testing system, wherein the temperature sensor is a fiber grating temperature sensor, and the strain sensor is a fiber grating strain sensor.
Optionally, the energy underground structure model experiment testing system, wherein the water supply equipment includes a water tank and a water pump, and the temperature cycle controller is communicated with the water tank and the water pump.
Optionally, the energy underground structure model experiment testing system is characterized in that an insulating layer is arranged on the outer wall of the model box.
Optionally, the energy source underground structure model experiment testing system is characterized in that the energy source underground structure model is made of a concrete material.
Has the advantages that: the invention provides an energy underground structure model test system, which obtains the following technical effects compared with the prior art:
(1) compared with other model tests, the larger model size also enables the energy underground structure to be placed into two typical energy underground structures of an energy pile and an energy tunnel. In the experimental process, the energy piles and the energy tunnels can be tested respectively, and the energy piles and the energy tunnels can also be tested simultaneously, so that the synergistic action conditions of different energy underground structure groups are discussed.
(2) The existing model test can only be carried out in a short period due to the restriction of test scale, and cannot reflect the long-term working thermodynamics and heat exchange characteristics of the energy underground structure.
Drawings
Fig. 1 is a schematic diagram of system units for testing temperature and stress distribution of an energy tunnel and an energy pile according to the invention.
Fig. 2 is a schematic cross-sectional view of a mold box.
FIG. 3 is a side schematic view of a mold box.
FIG. 4 is a schematic view of a mold box ring and molds of different cross-sections.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" as used herein includes both direct and indirect connections (couplings), unless otherwise specified. In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
As shown in fig. 1, an experimental testing system for an energy underground structure model includes: a model unit including a model box 5 containing test soil 6 and an energy underground structure model disposed in the test soil 6; the temperature loading unit comprises a water supply device, a temperature circulation controller 3 and a heat exchange piece 10 which are sequentially communicated through a pipeline, wherein the heat exchange piece 10 is arranged in the energy underground structure model; an air loading unit comprising an air fluid for applying different temperatures and/or velocities to the energy source subsurface structure model; and the detection unit comprises a temperature sensor 13 array arranged in the test soil 6, a temperature sensor 13 and a strain sensor 14 arranged in the energy underground structure model, the temperature sensor 13 and the strain sensor 14 are respectively connected with a demodulator 16, and the demodulator 16 is connected with a computer 17. The heat exchange member 10 is a heat exchange tube, which is a heat exchange tube commonly used in the prior art, and the specific structure thereof is not described herein again.
In this embodiment, hold experimental soil in the model experiment case, bury energy underground structure model underground in experimental soil, energy underground structure under the simulation natural environment, temperature loading unit through the system is the different temperatures of energy underground structure model loading, air for the different velocity of flow of energy underground structure model loading through the air loading unit for energy underground structure model loading is used for simulating energy underground structure receives temperature and air flow under the natural environment, detects through detecting element to the influence that energy underground structure model received temperature variation. The energy pile and the energy tunnel can be tested respectively, and the energy pile and the energy tunnel can also be tested simultaneously, so that the synergistic effect conditions of different energy underground structure groups are discussed. And a long-period cycle test which is the same as the actual working condition can be adopted to investigate the temperature creep effect of the material and the accumulated deformation generated under the long-term temperature load cycle action of the structure and the soil body. Therefore, the problem that an experimental test system capable of simulating the heating change of the underground structure is lacked in the prior art is solved.
In some embodiments, the model unit comprises a model box 5 containing test soil 6, and an energy pile model 11 and an energy tunnel model 12 arranged in the test soil 6, wherein the test soil 6 can be sand soil, clay or other types of mixed soil; the mold box 5 is a large-sized mold box, and the width and the depth of the mold box can be set according to actual conditions. The adverse factors caused by small experimental scale can be reduced, and the long-period cycle experiment which is the same as the actual working condition can be implemented. The energy pile model 11 and the energy tunnel model 12 are made of concrete materials, and the existing underground structure is mostly of a concrete structure, so that the energy pile model 11 and the energy tunnel model 12 of the concrete structure are selected as detection objects.
Optionally, the mold box has a width of from 1.5 meters to 2.5 meters, from 2.5 meters to 3.5 meters, from 3.5 meters to 4.5 meters.
Optionally, the depth of the mold box 5 is from 1 meter to 1.5 meters, from 1.5 meters to 2 meters, from 2 meters to 2.5 meters, from 2.5 meters to 3 meters.
Further, as shown in fig. 2-3, a pair of side surfaces of the mold box 5 are provided with circular openings, fixing portions are provided at outer sides of the openings, and waterproof rubber gaskets (not shown) are provided at inner sides of the openings for sealing. If the circular ring 19 is welded, the circular ring is provided with the screw port 20, the hole can be connected with the specific dies 21 with different sizes and shapes by screws, and the dies 21 can be connected with the energy tunnel models 12 with different shapes by combining the structure shown in figure 4, so that the energy tunnel models 12 with different shapes can be tested in the same model box. Meanwhile, the air flow in the tunnel can be simulated through the hole.
In this embodiment, a waterproof layer (not shown) is disposed on the inner wall of the mold box 5, and insulating layers are disposed on the outer wall of the mold box 5 and above the test soil 6, and the insulating layers are made of foam boards. The energy pile model 11 and the energy tunnel model 12 are both precast concrete models, and a pile cap 9 is placed on the energy pile model 11 and used for placing a displacement meter 8 and loading weights. The deformation quantity of the energy pile model 11 under different temperature changes can be tested through the displacement meter 8.
In some embodiments, the water supply device comprises a water tank 1 and a water pump 2, the water tank 1 and the water pump 2 are communicated with the temperature cycle controller and the heat exchange pipe 10, a flow meter 7 is further arranged on a water inlet pipeline of the heat exchange pipe 10, and the water flow in the heat exchanger 10 is controlled through the flow meter 7. The temperature of the energy underground structure model is controlled by taking water as a heat exchange medium through the temperature circulation controller and the heat exchange tube, so that accurate temperature simulation can be realized.
In some embodiments, the air loading unit comprises an air conditioner 18, and the air outlet of the air conditioner 18 is connected with the opening of the circular ring 19 of the mold box 5 by a plastic film. Applying air fluids of different temperatures and/or velocities to the energy source subsurface structure model.
In some embodiments, the temperature sensor is a fiber grating temperature sensor and the strain sensor is a fiber grating strain sensor.
The energy underground structure model experiment test system provided by the invention is further explained by specific operation steps.
And connecting the model unit, the temperature loading unit, the air loading unit and the detection unit. Testing the basic physical performance index of the soil for the test to ensure that the soil for the test reaches the standard; then the test soil is filled into the model box 5 layer by layer and is compacted by a rammer. And when the filling soil reaches the preset thickness, putting the energy tunnel model 12 and the energy pile model 11 into preset positions, and then continuously filling the test soil in a layered mode. In the process of filling the test soil 6, the optical fiber sensor 13 is embedded at a predetermined position, the grating demodulator 16 is connected, and the grating demodulator 16 is connected to the computer 17. After the test soil 6 is filled, the pile cap is stably buckled on the energy pile model 11, and the displacement meter 15 is placed at the edge of the pile cap and connected to a data acquisition system through a signal transmission line. And then stacking the weight plates in the center of the pile cap, so that the load can axially act on the pile body. Water in the water tank is pumped to the temperature cycle controller through the water pump, then the heat exchange fluid with the set test temperature is pumped to the energy pile and the heat exchange tube in the energy tunnel through the temperature cycle controller, the flow of the heat exchange fluid can be adjusted to the set test value through the valve, and the flow can be monitored in real time through the flow meter. An air supply outlet of the air conditioner is connected with a tunnel opening at the circular ring of the model box through a plastic film, and air fluid with different temperatures and different flow rates is applied to the tunnel according to test requirements. Obtaining structural change data of the energy pile model 11 and the energy tunnel model 12 under different experimental conditions, and inspecting the temperature creep effect of materials of the structure and the soil body under the long-term temperature load circulation effect and the generated accumulated deformation.
In summary, the present invention provides an energy underground structure model experiment testing system, which includes: the model unit comprises a model box containing soil for test and an energy underground structure model arranged in the soil for test; the temperature loading unit comprises a water supply device, a temperature circulation controller and a heat exchange piece which are sequentially communicated through a pipeline, and the heat exchange piece is arranged in the energy underground structure model; an air loading unit comprising an air fluid for applying different temperatures and/or velocities to the energy source subsurface structure model; the detection unit comprises a temperature sensor array arranged in the test soil, and a temperature sensor and a strain sensor arranged in the energy underground structure model, wherein the temperature sensor and the strain sensor are respectively connected with a demodulator, and the demodulator is connected with a computer. The system provided by the invention has the following technical effects:
(1) compared with other model tests, the two sides of the model box are provided with the holes, air flow in the tunnel can be simulated, then the circular rings are welded at the holes of the model box, the circular rings are provided with screw holes, the specific moulds with different sizes and different shapes can be connected in the holes by screws, and the same model box can adapt to tunnel models with different types. The test model has enough size, and can better control boundary conditions including seepage boundary and thermal boundary conditions, thereby better avoiding the influence of size effect.
(2) Compared with other model tests, the larger model size also enables the energy underground structure to be placed into two typical energy underground structures of an energy pile and an energy tunnel. In the experimental process, the energy piles and the energy tunnels can be tested respectively, and the energy piles and the energy tunnels can also be tested simultaneously, so that the synergistic action conditions of different energy underground structure groups are discussed.
(3) The existing model test can only be carried out in a short period due to the restriction of test scale, and cannot reflect the long-term working thermodynamics and heat exchange characteristics of the energy underground structure.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (9)
1. An energy underground structure model experiment test system is characterized by comprising:
the model unit comprises a model box containing soil for test and an energy underground structure model arranged in the soil for test;
the temperature loading unit comprises a water supply device, a temperature circulation controller and a heat exchange piece which are sequentially communicated through a pipeline, and the heat exchange piece is arranged in the energy underground structure model;
an air loading unit comprising an air fluid for applying different temperatures and/or velocities to the energy source subsurface structure model;
the detection unit comprises a temperature sensor array arranged in the test soil, and a temperature sensor and a strain sensor arranged in the energy underground structure model, wherein the temperature sensor and the strain sensor are respectively connected with a demodulator, and the demodulator is connected with a computer.
2. The energy resource underground structure model experiment testing system according to claim 1, characterized in that the energy resource underground structure model comprises an energy pile model and/or an energy tunnel model.
3. The energy underground structure model experiment test system according to claim 1, wherein holes are respectively formed in two side walls of the model box, and fixing portions are arranged on the holes.
4. The energy resource underground structure model experiment testing system according to claim 1, characterized in that a flow meter is arranged on a pipeline connecting the temperature cycle controller and the energy resource underground structure model.
5. The energy underground structure model experiment testing system according to claim 2, wherein when the energy underground structure model is an energy pile model, a displacement meter is arranged at a pile head of the energy pile model, and the displacement meter is connected with a displacement collector.
6. The energy resource underground structure model experiment testing system according to claim 1, wherein the temperature sensor is a fiber grating temperature sensor and the strain sensor is a fiber grating strain sensor.
7. The energy resource underground structure model experiment test system according to claim 1, wherein the water supply device comprises a water tank and a water pump, and the temperature cycle controller is communicated with the water tank and the water pump.
8. The energy resource underground structure model experiment testing system according to claim 1, characterized in that the outer wall of the model box is provided with an insulating layer.
9. The energy resource underground structure model experiment testing system of claim 1, wherein the energy resource underground structure model is made of concrete material.
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Cited By (1)
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