CN105527389A - Jack-based experiment model and method for simulating uneven settlement of foundation - Google Patents
Jack-based experiment model and method for simulating uneven settlement of foundation Download PDFInfo
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Abstract
The invention relates to a jack-based experiment model for simulating the uneven settlement of a foundation. The experiment model comprises a model box with an upper opening and is characterized in that a base frame is arranged at the bottom of the cavity of the model box, the base frame is formed by partition plates, square cells are arranged among the partition plates, a prefabricated plate is arranged in each square cell, and jacks are arranged below each prefabricated plate and connected with a hydraulic system. An experiment method includes the steps of a, building the model box; b, arranging the base frame; c, arranging the jacks and the prefabricated plates; d, filling a foundation layer; e, building an upper engineering structure layer; f, simulating foundation settlement; g, collecting and analyzing data. The experiment model and method has the advantages that the jacks can drive the ascending and descending of the prefabricated plate in the corresponding square cell, and accordingly multipoint uneven settlement simulation of the foundation layer can be achieved; the multipoint uneven settlement of the foundation can be analyzed by collecting and analyzing the data output by sensors, and the experiment model and method is good in simulation effect, low in cost and high in experiment repeatability.
Description
Technical field
The present invention relates to a kind of test model and method of ground foundation simulation non-uniform settling, in particular, particularly relate to a kind of utilize the lifting of lifting jack to carry out ground foundation simulation non-uniform settling test model and method.
Background technology
Affect by 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 is studied by methods such as theory calculate, numerical simulation, model test, on-the-spot test with control.Wherein, model test is that reduced scale restores engineering structure in proportion, can realize simulated object distortion monitor, many condition control, can repeat, it is the effective means of research engineering structure stress distortion, by testing the stress deformation of 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 layering to pave the model production method of foundation soil, cannot simulate the sink deformation of lower floor's foundation soil, cannot realize the simulation to non-uniform settling.Theory calculate and numerical simulation can reflect ground stress deformation Changing Pattern to a certain extent, but it is larger with actual error, precision has much room for improvement, though on-the-spot test can the most intuitively reflect uneven subsidence, but cost higher and be difficult to carry out many influence factors control under revision test, model test has both advantages concurrently, therefore develops the test model that can realize ground foundation simulation non-uniform settling and has higher construction value.
Summary of the invention
The present invention, in order to overcome the shortcoming of above-mentioned technical matters, provides a kind of test model and method of the ground foundation simulation non-uniform settling based on lifting jack.
The test model of the ground foundation simulation non-uniform settling based on lifting jack of the present invention, comprises the model casing of upper end open, and the inside of model casing is the cavity arranging ground layer, 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, forms the grid that inside is cavity, be provided with prefabricated board in grid between adjacent separator; The below of described prefabricated board is provided with multiple lifting jack, and the both sides below prefabricated board are fixed with pulley, and dividing plate is provided with the wheel track to pulley guiding, lifting jack is connected with hydraulic system; The lifting jack lifting in different grid can be controlled, to realize the sedimentation of ground layer diverse location by hydraulic system.
The test model of the ground foundation simulation non-uniform settling based on lifting jack of the present invention, the top of described base frame is leaked to the geotextile in grid under being provided with and preventing the earth in ground layer.
The test model of the ground foundation simulation non-uniform settling based on lifting jack 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 be fixed on model casing, fixed frame are provided with the gathering sill be convenient to glass door and inserted and take out.
The experimental technique of the test model of the ground foundation simulation non-uniform settling based on lifting jack of the present invention, its special feature is, realized by following steps: a). build model casing, according to testing requirements 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 bottom installation dimension, the satisfactory base frame of grid number of model casing cavity; C). lifting jack 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, the satisfactory lifting jack of quantity is installed in each grid of base frame, and lifting jack is connected to the corresponding output of hydraulic system, then above lifting jack, settle prefabricated board, and the pulley ensureing on prefabricated board falls into the wheel track on dividing plate; D). fill-up ground basic unit, according to the Practical Project geologic condition that will simulate, chooses the top that suitable soil property is layed in base frame, forms ground layer; And in ground layer, pressure transducer, the displacement transducer of some is buried underground according to testing requirements; E). build upper part work structural sheet, for simulated object, ground layer building the engineering structure consistent with treating simulated object, forming engineering structure layer, and burying strain, pressure, displacement transducer underground in corresponding position; F). settlement of foundation is simulated, according to the sedimentation location of setting, be elevated by the lifting jack in the corresponding grid of HYDRAULIC CONTROL SYSTEM, with the sedimentation of ground layer relevant position in implementation model case, controlled the settling amount of ground layer by the adjustable height controlling lifting jack; G). Data acquisition and issuance, in settlement of foundation simulation process, measure and record all data burying sensor underground, by the data variation of Monitoring Data sensor, the analytically Changing Pattern of superstructure stress deformation that causes of Quito point non-uniform settling, simulation test can destroy completely to the engineering structure layer on ground layer.
The invention has the beneficial effects as follows: the empirical model of ground foundation simulation non-uniform settling of the present invention and method, ground layer and engineering structure layer is provided with from the bottom to top in model casing cavity, the below of ground layer is provided with the base frame of some grids formation, be provided with prefabricated board in grid and order about the lifting jack of prefabricated board lifting, under the control of hydraulic system to lifting jack, the lifting of prefabricated board in corresponding grid can be ordered about, and then realize the simulation of ground layer multiple spot, non-uniform settling; By the data gathered, analyte sensors exports, realize the analysis of Quito point non-uniform settling rule over the ground.Relative to emulation experiment, data and the analysis result of acquisition are actual, relative to on-the-spot test, there is repeatability, advantage that cost is low, therefore, empirical model of the present invention and method have that simulate effect is good, cost is low, can repeat experimental strong advantage, and beneficial effect is remarkable, is suitable for application.
(1), can according to the difference of testing requirements, the position of base frame structure separate space is set flexibly, by controlling the lifting of the position prefabricated board separating separate space, the simulation of deep ground earth non-uniform settling can be realized, realize the simulation of the dissimilar sedimentations such as bumping at bridge-head, non-uniform settling, land in gully, edge sedimentation.
(2), by oil pump drive lifting jack heave amplitude, the accurate control to settling amount, subsidence rate can be realized.
(3), owing to whole testing equipment can be placed in indoor, the model test environment of such as humidity, temperature parameter is made to be easy to control, survey sensor is easy to lay and monitoring, combined sensor Monitoring Data, process of the test conveniently can monitor the distortion stressing conditions of ground layer and upper part work structural sheet.
(4), testing equipment structure is simple and clear, operability is high, and this model casing manufacturing cost is not high, and is widely used, and this test model and method are easy to realize and promote.
Accompanying drawing explanation
Fig. 1 is the structural representation of the test model of the ground foundation simulation non-uniform settling based on lifting jack 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 non-uniform settling 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 lifting jack, 10 hydraulic systems, 11 transparent glass doors, 12 fixed frames, 13 scale marks, 14 geotextile, 15 ground layers, 16 engineering structure layers, 17 survey sensors.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
As shown in Figure 1, give the structural representation of the test model of the ground foundation simulation non-uniform settling based on lifting jack of the present invention, it is made up of model casing 1, base frame 3, prefabricated board 6, pulley 7, guide rail 8, lifting jack 9, hydraulic system 10, transparent glass door 11, fixed frame 12, geotextile 14, upper end open, the inside of shown model casing 1 are cavity 2, and 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, the orthogonal state of 4 one-tenth, the dividing plate as interlaced, like this, just defines the inner grid 5 for cavity between adjacent separator 4.As indicated with 2, the structural representation of base frame 3 in the present invention is given.
Be provided with the prefabricated board 6 that can move up and down in each grid 5, the both sides below prefabricated board 6 are all fixed with pulley 7, dividing plate 4 are provided with the wheel track 8 led to pulley 7.The below of prefabricated board 6 is provided with multiple lifting jack 9, and the oil-feed port of lifting jack 9 communicates with the respective line of hydraulic system 10, can order about the upper and lower lifting of prefabricated board by lifting jack 9.In simulated experiment process, control lifting jack 9 lifting action in different grid 5 and lifting amount by hydraulic system 10, and then order about prefabricated board 6 oscilaltion at diverse location place in base frame 3, to realize the non-uniform settling of diverse location ground layer 15.
The top of shown base frame 3 is also provided with geotextile 14, by the stop of earth in geotextile 14 pairs of ground layers 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 freely being elevated of prefabricated board 6.
For the ease of in simulated experiment process to the observation of ground layer 15 variable condition, a sidewall of shown model casing 1 can make the form of transparent glass door 11, model casing 1 is provided with the fixed frame 12 that transparent glass door 11 is fixed, fixed frame 12 offers the gathering sill matched in transparent glass door 11.Shown transparent glass door 11 is provided with scale mark 13, so as in process of the test the settling amount of observation place basic unit 15.
As shown in Figure 3, give the test model application principle figure of ground foundation simulation non-uniform settling 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, sensor is provided with in ground layer 15 and engineering structure layer 16, the type of sensor is arranged as required, as pressure transducer, displacement transducer and/or strain transducer.In experimentation, by the analysis to sensor output data, ground diverse location can be obtained, impact that non-uniform settling causes ground layer 15 and engineering structure layer 16.
The experimental technique of the test model of the ground foundation simulation non-uniform settling based on lifting jack of the present invention, is realized by following steps:
A). build model casing, according to testing requirements 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 bottom installation dimension, the satisfactory base frame of grid number of model casing cavity;
C). lifting jack 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, the satisfactory lifting jack of quantity is installed in each grid of base frame, and lifting jack is connected to the corresponding output of hydraulic system, then above lifting jack, settle prefabricated board, and the pulley ensureing on prefabricated board falls into the wheel track on dividing plate;
D). fill-up ground basic unit, according to the Practical Project geologic condition that will simulate, chooses the top that suitable soil property is layed in base frame, forms ground layer; And in ground layer, pressure transducer, the displacement transducer of some is buried underground according to testing requirements;
E). build upper part work structural sheet, for simulated object, ground layer building the engineering structure consistent with treating simulated object, forming engineering structure layer, and burying strain, pressure, displacement transducer underground in corresponding position;
F). settlement of foundation is simulated, according to the sedimentation location of setting, be elevated by the lifting jack in the corresponding grid of HYDRAULIC CONTROL SYSTEM, with the sedimentation of ground layer relevant position in implementation model case, controlled the settling amount of ground layer by the adjustable height controlling lifting jack;
G). Data acquisition and issuance, in settlement of foundation simulation process, measure and record all data burying sensor underground, by the data variation of Monitoring Data sensor, the analytically Changing Pattern of superstructure stress deformation that causes of Quito point non-uniform settling, simulation test can destroy completely to the engineering structure layer on ground layer.
Claims (4)
1. the test model based on the ground foundation simulation non-uniform settling of lifting jack, 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), forms the grid (5) that inside is cavity, be provided with prefabricated board (6) in grid between adjacent separator; The below of described prefabricated board is provided with multiple lifting jack (9), and the both sides below prefabricated board are fixed with pulley (7), and dividing plate is provided with the wheel track (8) to pulley guiding, lifting jack is connected with hydraulic system (10); The lifting jack lifting in different grid can be controlled, to realize the sedimentation of ground layer diverse location by hydraulic system.
2. the test model of the ground foundation simulation non-uniform settling based on lifting jack according to claim 1, is characterized in that: the top of described base frame (3) is leaked to the geotextile (14) in grid (5) under being provided with and preventing the earth in ground layer (15).
3. the test model of the ground foundation simulation non-uniform settling based on lifting jack 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) be fixed on model casing, fixed frame are provided with the gathering sill be convenient to glass door and inserted and take out.
4. an experimental technique for the test model of the ground foundation simulation non-uniform settling based on lifting jack according to claim 1, be is characterized in that, realized by following steps:
A). build model casing, according to testing requirements 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 bottom installation dimension, the satisfactory base frame of grid number of model casing cavity;
C). lifting jack 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, the satisfactory lifting jack of quantity is installed in each grid of base frame, and lifting jack is connected to the corresponding output of hydraulic system, then above lifting jack, settle prefabricated board, and the pulley ensureing on prefabricated board falls into the wheel track on dividing plate;
D). fill-up ground basic unit, according to the Practical Project geologic condition that will simulate, chooses the top that suitable soil property is layed in base frame, forms ground layer; And in ground layer, pressure transducer, the displacement transducer of some is buried underground according to testing requirements;
E). build upper part work structural sheet, for simulated object, ground layer building the engineering structure consistent with treating simulated object, forming engineering structure layer, and burying strain, pressure, displacement transducer underground in corresponding position;
F). settlement of foundation is simulated, according to the sedimentation location of setting, be elevated by the lifting jack in the corresponding grid of HYDRAULIC CONTROL SYSTEM, with the sedimentation of ground layer relevant position in implementation model case, controlled the settling amount of ground layer by the adjustable height controlling lifting jack;
G). Data acquisition and issuance, in settlement of foundation simulation process, measure and record all data burying sensor underground, by the data variation of Monitoring Data sensor, the analytically Changing Pattern of superstructure stress deformation that causes of Quito point non-uniform settling, simulation test can destroy completely to the engineering structure layer on ground layer.
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| CN105976690A (en) * | 2016-06-29 | 2016-09-28 | 广西大学 | Draining and pressure reducing model testing apparatus |
| CN106645634A (en) * | 2016-10-14 | 2017-05-10 | 西京学院 | Ground surface simulating device and experiment method thereof |
| CN106768906A (en) * | 2016-11-09 | 2017-05-31 | 北京工业大学 | The experimental provision and method of static pressure parallels regulation and control lathe bed precision |
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