CN105604105A - Experiment model and method for simulating differential settlement of foundation based on water bag method - Google Patents
Experiment model and method for simulating differential settlement of foundation based on water bag method Download PDFInfo
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- CN105604105A CN105604105A CN201610116289.2A CN201610116289A CN105604105A CN 105604105 A CN105604105 A CN 105604105A CN 201610116289 A CN201610116289 A CN 201610116289A CN 105604105 A CN105604105 A CN 105604105A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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Abstract
The invention discloses an experiment model for simulating differential settlement of a foundation based on a water bag method. The experiment model comprises a model box with an opening in the upper end and is characterized in that a base frame is arranged at the bottom of a cavity of the model box, the base frame is composed of partition plates, the partition plates are lattices, and prefabricated plates are arranged in the lattices; water bags are arranged below the prefabricated plates and connected with a water tank system. An experiment method comprises the steps that a, the model box is established; b, the base frame is arranged; c, the water bags and the prefabricated plates are arranged; d, a foundation layer is filled up; e, an upper engineering structure layer is constructed; f, foundation settlement is simulated; g, data collection and analysis are carried out. According to the experiment model and method, the water bags can drive the prefabricated plates in the corresponding lattices to ascend and descend, simulation of multi-point differential settlement of the foundation layer is realized, the experiment and the situation that the foundation rises or falls under the action of underground water are quite similar due to adoption of the water bags, and the experiment model and method have the advantages that the simulation effect is good, cost is low, and repeatable experiment performance is high.
Description
Technical field
The present invention relates to a kind of test model and method of ground foundation simulation differential settlement, in particular, relate in particular to a kind of test model that collapses ground foundation simulation differential settlement and method of utilizing water pocket.
Background technology
Affected by the multiple factors such as external loads effect, temperature, water, very easily there is the disease of uneven settlement of foundation in the structures such as road and rail roadbed, building construction, the mechanism of uneven settlement of foundation can be studied by methods such as theory calculating, numerical simulation, model test, on-the-spot test with control. Wherein, model test is that reduced scale restores engineering structure in proportion, can realize the monitoring of simulated object distortion, the control of many conditions, can repeat, it is the effective means of research engineering structure stress distortion, by the stress deformation test to foundation model and upper part work structure, can be used for the property indices of the true engineering structure of estimate analysis. Model casing is scale (model) test common equipment, and current model casing all adopts the pave model production method of foundation soil of layering, cannot simulate the sink deformation of lower floor's foundation soil, cannot realize the simulation to differential settlement. Theoretical calculating with numerical simulation can be reflected ground stress deformation Changing Pattern to a certain extent, but larger with actual error, precision has much room for improvement, though on-the-spot test can the most intuitively reflect uneven subsidence, but cost is higher and be difficult to carry out the repetition test under the control of many influence factors, model test has both advantages concurrently, and the test model that therefore exploitation can realize ground foundation simulation differential settlement has higher construction value.
Summary of the invention
The present invention, in order to overcome the shortcoming of above-mentioned technical problem, provides a kind of test model and method of the ground foundation simulation differential settlement based on water-filled balloon method.
The test model of the ground foundation simulation differential settlement based on water-filled balloon method of the present invention, comprises the model casing of upper end open, and the inside of model casing is the cavity that ground layer is set, and the top of ground layer is for arranging engineering structure layer to be tested; Its special feature is: the bottom of described model casing cavity is provided with base frame, and base frame is made up of interlaced dividing plate, and between adjacent separator, forming inside is the grid of cavity, is provided with prefabricated board in grid; The below of described prefabricated board is provided with water pocket, and the both sides of prefabricated board below are fixed with pulley, are provided with the wheel track to pulley guiding on dividing plate, and water pocket is connected with cistern system; The water pocket that can control in different grids by cistern system collapses, to realize the sedimentation of ground layer diverse location.
The test model of the ground foundation simulation differential settlement based on water-filled balloon method of the present invention, the top of described base frame is provided with the geotextiles of leaking under the earth preventing in ground layer in grid.
The test model of the ground foundation simulation differential settlement based on water-filled balloon method of the present invention, a side of described model casing is for ease of observing the transparent glass door of situation in cavity, the both sides of transparent glass door are provided with the fixed frame being fixed on model casing, be provided with and be convenient to the gathering sill that glass door inserts and takes out on fixed frame.
The experimental technique of the test model of the ground foundation simulation differential settlement based on water-filled balloon method of the present invention, its special feature is, realize by following steps: a). build model casing, according to test requirements document and object, build the model casing that length is of the required size; B). arrange base frame, according to the Practical Project situation that will simulate, first in the bottom of model casing cavity installation dimension, the satisfactory base frame of grid number; C). water pocket and prefabricated board are set, first according to the weight of the ground layer that will build and engineering structure layer, calculate the field of load of each prefabricated board, in each grid of base frame, water pocket is installed, and water pocket is connected with the corresponding port of cistern system, then above water pocket, settle prefabricated board, and ensure that the pulley on prefabricated board falls into the wheel track on dividing plate; D). fill-up ground basic unit, according to the Practical Project geological conditions that will simulate, choose suitable soil property and be layed in the top of base frame, form ground layer; And in ground layer, bury pressure sensor, the displacement transducer of some underground according to test requirements document; E). build upper part work structure sheaf, for simulated object, on ground layer, build and the engineering structure for the treatment of that simulated object is consistent, form engineering structure layer, and bury strain, pressure, displacement transducer underground in corresponding position; F). settlement of foundation simulation, according to the sedimentation location of setting, shrink by the water pocket in the corresponding grid of cistern system control, with the sedimentation of ground layer relevant position in implementation model case, by controlling the settling amount that collapses size and control ground layer of water pocket; G). data acquisition and analysis, in settlement of foundation simulation process, measure and record all data of burying sensor underground, by the data variation of monitored data sensor, analyze the Changing Pattern of the superstructure stress deformation that ground multiple spot differential settlement causes, simulation test can destroy completely to the engineering structure layer on ground layer.
The invention has the beneficial effects as follows: the experimental model of ground foundation simulation differential settlement of the present invention and method, in model casing cavity, be provided with from the bottom to top ground layer and engineering structure layer, the below of ground layer is provided with the base frame that some grids form, in grid, be provided with prefabricated board and order about the water pocket of prefabricated board lifting, cistern system to the control of water pocket under, can order about the lifting of prefabricated board in corresponding grid, and then realize the simulation of ground layer multiple spot, differential settlement; By the data that gather, analyte sensors is exported, realize the analysis of Quito point differential settlement rule over the ground. Because the form that adopts water pocket water filling or discharge water is simulated, be subject to the effect situation of underground water rising or decline quite similar with ground, simulated experiment is approached more actual, experimental data is truer. With respect to emulation experiment, the data and the analysis result that obtain are actual, with respect to on-the-spot test, have advantages of that repeatability, cost are low, therefore, experimental model of the present invention and method have advantages of that simulate effect is good, cost is low, it is experimental strong to repeat, and beneficial effect is remarkable, is suitable for application.
(1), can be according to the difference of test requirements document, the position of base frame structure separate space is set flexibly, separate the lifting of the position prefabricated board of separate space by control, can realize the simulation of deep ground earth differential settlement, realize the simulation of the dissimilar sedimentations such as bumping at bridge-head, differential settlement, cheuch landform, edge sedimentation.
(2), drive water pocket to collapse amplitude by oil pump, can realize the accurate control to settling amount, the rate of settling.
(3), owing to can whole testing equipment being placed in indoor, make to be easy to control such as the model test environment of humidity, temperature parameter, measuring transducer is easy to lay and monitoring, combined sensor monitored data, process of the test can conveniently be monitored the distortion stressing conditions of ground layer and upper part work structure sheaf.
(4), testing equipment structure is simple and clear, operability is high, this model casing manufacturing cost is not high, and is widely used, this test model and method are easy to realize and promote.
Brief description of the drawings
Fig. 1 is the structural representation of the test model of the ground foundation simulation differential settlement based on water-filled balloon method of the present invention;
Fig. 2 is the structural representation of base frame in the present invention;
Fig. 3 is the test model application principle figure of ground foundation simulation differential settlement of the present invention.
In figure: 1 model casing, 2 cavitys, 3 base frame, 4 dividing plates, 5 grids, 6 prefabricated boards, 7 pulleys, 8 wheel tracks, 9 water pockets, 10 cistern systems, 11 transparent glass doors, 12 fixed frames, 13 graduation marks, 14 geotextiles, 15 ground layers, 16 engineering structure layers, 17 measuring transducers.
Detailed description of the invention
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
As shown in Figure 1, provide the structural representation of the test model of the ground foundation simulation differential settlement based on water-filled balloon method of the present invention, it is made up of model casing 1, base frame 3, prefabricated board 6, pulley 7, guide rail 8, water pocket 9, cistern system 10, transparent glass door 11, fixed frame 12, geotextiles 14, shown in upper end open, the inside of model casing 1 be cavity 2, base frame 3 is arranged at the bottom of model casing 1 internal cavities 2. Shown base frame 3 is made up of interlaced fixing dividing plate 4, as 4 one-tenth orthogonal states of interlaced dividing plate, like this, has just formed the inner grid 5 for cavity between adjacent separator 4. As shown in 2, provide the structural representation of base frame 3 in the present invention.
In each grid 5, be provided with the prefabricated board 6 that can move up and down, the both sides of prefabricated board 6 belows are all fixed with pulley 7, are provided with the wheel track 8 that pulley 7 is led on dividing plate 4. The below of prefabricated board 6 is provided with water pocket 9, and the feed water inlet of water pocket 9 communicates with the respective line of cistern system 10, can order about the upper and lower lifting of prefabricated board by expansion, the contraction of water pocket 9. In simulated experiment process, control expansion and contractive action and the amount of collapsing of water pocket 9 in different grids 5 by cistern system 10, and then order about prefabricated board 6 oscilaltions at diverse location place in base frame 3, to realize the differential settlement of diverse location ground layer 15.
The top of shown base frame 3 is also provided with geotextiles 14, to the stopping of earth in ground layer 15, can effectively avoid earth to fall into grid 5 by the gap between prefabricated board 6 and dividing plate 4, in order to avoid affect the free lifting of prefabricated board 6 by geotextiles 14.
For the ease of the observation to ground layer 15 variable condition in simulated experiment process, shown in a sidewall of model casing 1 can make the form of transparent glass door 11, on model casing 1, be provided with the fixed frame 12 that transparent glass door 11 is fixed, on fixed frame 12, offer the gathering sill matching in transparent glass door 11. On shown transparent glass door 11, be provided with graduation mark 13, so as in process of the test the settling amount of observation place basic unit 15.
As shown in Figure 3, provide the test model application principle figure of ground foundation simulation differential settlement of the present invention, shown ground layer 15 is arranged at the top of base frame 3, engineering structure layer 16 is arranged at the top of ground layer 15, in ground layer 15 and engineering structure layer 16, be provided with sensor, the type of sensor arranges as required, as pressure sensor, displacement transducer and/or strain transducer. In experimentation, by the analysis to sensor output data, can obtain the impact that ground diverse location, differential settlement cause ground layer 15 and engineering structure layer 16.
The experimental technique of the test model of the ground foundation simulation differential settlement based on water-filled balloon method of the present invention, realize by following steps:
A). build model casing, according to test requirements document and object, build the model casing that length is of the required size;
B). arrange base frame, according to the Practical Project situation that will simulate, first in the bottom of model casing cavity installation dimension, the satisfactory base frame of grid number;
C). water pocket and prefabricated board are set, first according to the weight of the ground layer that will build and engineering structure layer, calculate the field of load of each prefabricated board, in each grid of base frame, water pocket is installed, and water pocket is connected with the corresponding port of cistern system, then above water pocket, settle prefabricated board, and ensure that the pulley on prefabricated board falls into the wheel track on dividing plate;
D). fill-up ground basic unit, according to the Practical Project geological conditions that will simulate, choose suitable soil property and be layed in the top of base frame, form ground layer; And in ground layer, bury pressure sensor, the displacement transducer of some underground according to test requirements document;
E). build upper part work structure sheaf, for simulated object, on ground layer, build and the engineering structure for the treatment of that simulated object is consistent, form engineering structure layer, and bury strain, pressure, displacement transducer underground in corresponding position;
F). settlement of foundation simulation, according to the sedimentation location of setting, shrink by the water pocket in the corresponding grid of cistern system control, with the sedimentation of ground layer relevant position in implementation model case, by controlling the settling amount that collapses size and control ground layer of water pocket;
G). data acquisition and analysis, in settlement of foundation simulation process, measure and record all data of burying sensor underground, by the data variation of monitored data sensor, analyze the Changing Pattern of the superstructure stress deformation that ground multiple spot differential settlement causes, simulation test can destroy completely to the engineering structure layer on ground layer.
Claims (4)
1. the test model of the ground foundation simulation differential settlement based on water-filled balloon method, comprise the model casing (1) of upper end open, the inside of model casing is for arranging the cavity (2) of ground layer (15), and the top of ground layer is for arranging engineering structure layer (16) to be tested; It is characterized in that: the bottom of described model casing cavity is provided with base frame (3), base frame is made up of interlaced dividing plate (4), and between adjacent separator, forming inside is the grid (5) of cavity, is provided with prefabricated board (6) in grid; The below of described prefabricated board is provided with water pocket (9), and the both sides of prefabricated board below are fixed with pulley (7), are provided with the wheel track (8) to pulley guiding on dividing plate, and water pocket is connected with cistern system (10); The water pocket that can control in different grids by cistern system collapses, to realize the sedimentation of ground layer diverse location.
2. the test model of the ground foundation simulation differential settlement based on water-filled balloon method according to claim 1, is characterized in that: the top of described base frame (3) is provided with the geotextiles (14) of leaking under the earth preventing in ground layer (15) in grid (5).
3. the test model of the ground foundation simulation differential settlement based on water-filled balloon method according to claim 1 and 2, it is characterized in that: a side of described model casing (1) is for ease of observing the transparent glass door (11) of situation in cavity (2), the both sides of transparent glass door are provided with the fixed frame (12) being fixed on model casing, be provided with and be convenient to the gathering sill that glass door inserts and takes out on fixed frame.
4. an experimental technique for the test model of the ground foundation simulation differential settlement based on water-filled balloon method according to claim 1, is characterized in that, realizes by following steps:
A). build model casing, according to test requirements document and object, build the model casing that length is of the required size;
B). arrange base frame, according to the Practical Project situation that will simulate, first in the bottom of model casing cavity installation dimension, the satisfactory base frame of grid number;
C). water pocket and prefabricated board are set, first according to the weight of the ground layer that will build and engineering structure layer, calculate the field of load of each prefabricated board, in each grid of base frame, water pocket is installed, and water pocket is connected with the corresponding port of cistern system, then above water pocket, settle prefabricated board, and ensure that the pulley on prefabricated board falls into the wheel track on dividing plate;
D). fill-up ground basic unit, according to the Practical Project geological conditions that will simulate, choose suitable soil property and be layed in the top of base frame, form ground layer; And in ground layer, bury pressure sensor, the displacement transducer of some underground according to test requirements document;
E). build upper part work structure sheaf, for simulated object, on ground layer, build and the engineering structure for the treatment of that simulated object is consistent, form engineering structure layer, and bury strain, pressure, displacement transducer underground in corresponding position;
F). settlement of foundation simulation, according to the sedimentation location of setting, shrink by the water pocket in the corresponding grid of cistern system control, with the sedimentation of ground layer relevant position in implementation model case, by controlling the settling amount that collapses size and control ground layer of water pocket;
G). data acquisition and analysis, in settlement of foundation simulation process, measure and record all data of burying sensor underground, by the data variation of monitored data sensor, analyze the Changing Pattern of the superstructure stress deformation that ground multiple spot differential settlement causes, simulation test can destroy completely to the engineering structure layer on ground layer.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106567416A (en) * | 2016-10-19 | 2017-04-19 | 重庆大学 | Model test device of excavating tunnel in transparent soil foundation and test method |
| CN106596268A (en) * | 2017-01-23 | 2017-04-26 | 长安大学 | Multi-soaking condition simulation test model box and test method thereof |
| CN107315082A (en) * | 2017-07-24 | 2017-11-03 | 武汉理工大学 | A kind of many depression door model assay systems of three-dimensional array type |
| CN110232860A (en) * | 2019-06-11 | 2019-09-13 | 长沙理工大学 | Multifunction test device and its test method for soil mechanics plane strain problems |
| CN112114114A (en) * | 2020-09-24 | 2020-12-22 | 白杨 | Experimental device for simulating influence of high-arsenic underground water irrigation on underground water environment |
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| CN202182846U (en) * | 2011-07-20 | 2012-04-04 | 西南交通大学 | Model relative settlement control equipment for soil engineering centrifugal machine tests |
| CN102426396A (en) * | 2011-09-05 | 2012-04-25 | 同济大学 | Testing apparatus for simulating deep-displacement-initiated strata deformation coordination mechanism |
| CN102493499A (en) * | 2011-11-16 | 2012-06-13 | 中南大学 | Model test device for measuring composite foundation lateral deformation and layered sedimentation |
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| JPH11167340A (en) * | 1997-12-02 | 1999-06-22 | Sekisui House Ltd | Experimenting system for soft ground improvement section |
| CN102108712A (en) * | 2010-12-28 | 2011-06-29 | 天津大学 | Sedimentation-controllable foundation system |
| CN202182846U (en) * | 2011-07-20 | 2012-04-04 | 西南交通大学 | Model relative settlement control equipment for soil engineering centrifugal machine tests |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106567416A (en) * | 2016-10-19 | 2017-04-19 | 重庆大学 | Model test device of excavating tunnel in transparent soil foundation and test method |
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| CN106596268A (en) * | 2017-01-23 | 2017-04-26 | 长安大学 | Multi-soaking condition simulation test model box and test method thereof |
| CN107315082A (en) * | 2017-07-24 | 2017-11-03 | 武汉理工大学 | A kind of many depression door model assay systems of three-dimensional array type |
| CN107315082B (en) * | 2017-07-24 | 2024-05-24 | 武汉理工大学 | Three-dimensional array type multi-sinking door model test system |
| CN110232860A (en) * | 2019-06-11 | 2019-09-13 | 长沙理工大学 | Multifunction test device and its test method for soil mechanics plane strain problems |
| CN112114114A (en) * | 2020-09-24 | 2020-12-22 | 白杨 | Experimental device for simulating influence of high-arsenic underground water irrigation on underground water environment |
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Application publication date: 20160525 |