CN103837359A - Device for simulating harm of activities of ground fissures to high-speed rail bridge - Google Patents
Device for simulating harm of activities of ground fissures to high-speed rail bridge Download PDFInfo
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- CN103837359A CN103837359A CN201410067614.1A CN201410067614A CN103837359A CN 103837359 A CN103837359 A CN 103837359A CN 201410067614 A CN201410067614 A CN 201410067614A CN 103837359 A CN103837359 A CN 103837359A
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Abstract
The invention discloses a device for simulating harm of activities of ground fissures to a high-speed rail bridge, and belongs to the field of geological disaster analysis. The device comprises a lifting system used for controlling lifting of a ground fissure hanging wall and footwall and the lifting speed of a settlement platform and simulating the activities of the ground fissures, a supporting system used for supporting the lifting system to carry out lifting on the ground fissure hanging wall and footwall, and a monitoring system used for monitoring dislocation, deformation and bridge foundation stress characteristics of a high-speed rail bridge model. Changes of stress in the high-speed rail bridge, bridge deformation and damage zone ranges and unstability and interaction between the bridge and a rail are taken into consideration under the action of different activities of the ground fissures, scientific bases are provided for engineering control measures for sections crossing the ground fissures of the high-speed rail bridge, and meanwhile the harm of the ground fissures to the high-speed rail bridge can be more accurately forecasted.
Description
Technical field
The present invention relates to geological disasters analysis field, particularly a kind of ground fissure activity endangers device to high-speed rail bridge.
Background technology
Ground fissure be earth's surface rock, the soil body under nature or human factor effect, produce cracking, and form a kind of geological phenomenon in the crack of certain length and width on ground, in the time that this phenomenon occurs in mankind's activity regional, just can become a kind of geologic hazard.The formative factor of ground fissure is more, in general, large-scale ground fissure refers to structure ground fissure, it is the ground fissure being produced by earth endogenic geological process, its formation and tomography, geological process and regional stress field have direct corresponding relation, and its trend is consistent with underground fracture band, and scale is large, often be zonal arrangement, especially the operation of high ferro had a significant impact.
FLAC3D is the expansion of two-dimentional finite-difference program FLAC2D, can carry out the simulation of three-dimensional structure mechanical characteristic and the Plastic Flow analysis of soil property, rock and other material.Carry out the structure of matching reality by the polyhedron unit in adjustment 3D grid.Unit material can adopt linearity or Non-linear constitutive model, and under external force, when after material generation yield spread, grid can correspondingly deform and move (large deformation pattern).FLAC3D has adopted Explicit Lagrangian algorithm and mixing-discrete partitioning technique, very exactly the plastic failure of simulation material and moving.This software is less to the simulate effect error of ground fissure activity.
In prior art, lack the model of the damage of crack over the ground, harmfulness that cannot predictably cause in crack in time.
Summary of the invention
In order to solve the as above problem running in prior art, the present invention proposes a kind of ground fissure harm analogue means, described device comprises:
Jacking system, for controlling the rising or falling speed of the lifting of ground fissure upper lower burrs and settlement platform, crack activity in analog;
Support system, for supporting the lifting of described jacking system to ground fissure upper lower burrs;
Monitoring system, for monitoring dislocation, distortion and the abutment stress characteristic of high-speed rail bridge model.
The present invention is by considering the variation of the stress in high-speed railway bridge under the different activity effects of ground fissure, bridge deformation destruction region scope and unstability, and the interaction between the two of bridge and track.The engineering prevention and control of crossing over ground fissure location for high-speed railway bridge provides scientific basis, the predictably harm of crack to high-speed railway bridge more accurately simultaneously.
Brief description of the drawings
Fig. 1 is the structural drawing of the ground fissure harm analogue means that provides of the embodiment of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
The structure that the ground fissure that Fig. 1 shows the embodiment of the present invention to be provided endangers analogue means, details are as follows:
In an embodiment of the present invention, jacking system is mainly made up of lifting jack.
In an embodiment of the present invention, upper dish position lifting jack is used for controlling dish in ground fissure and declines, and lower wall position lifting jack is used for supporting ground fissure lower wall.
As the preferred embodiments of the present invention, the position of lifting jack is determined by the angle of ground fissure and high-speed railway route.
Jacking system is made up of the lifting jack of 14 range 30t, and wherein 7 lifting jack are positioned at dish position, and 7 lifting jack are positioned at lower wall position, and upper dish position lifting jack is used for controlling in ground fissure and coils lifting, is positioned at lower wall position lifting jack and mainly plays a supporting role.Lifting jack can crack, base area and its position of high-speed railway route corner dimension control, the decline rate that can control settlement platform by jacking system in analog on crack dish decline.
In an embodiment of the present invention, support system is made up of bottom platform and both sides steel construction side plate.
In an embodiment of the present invention, components and parts mainly comprise Level monitoring, strain transducer and string wire pressure cell.
As a preferred embodiment of the present invention, the collected data of components and parts comprise the Level monitoring data of spirit-leveling instrument collection, the strain transducer data of data acquisition system (DAS) collection and the string wire pressure cell data that readout instrument gathers.
Such as subway line and the ground fissure angle of cut are the physical model of 45 °, taking large western high-speed railway as real background, intersect owing to being 45 °, ground fissure is taking bright and beautiful ground fissure as prototype ground fissure.This ground fissure is beading, and time of occurrence is before approximately 7～8 years; Ground shows the about 100m of length, stitches wide approximately 0.5～0.25m; Have no vertical fault situation, taking horizontal tension as main, while irrigating the fields, leak more, can hear Groundwater Flow sound.
The manner of large western Line for Passenger Transportation ground fissure along the line is upper dish taking near vertically to as main subsiding movement, and lower wall slightly rises or stablizes motionlessly, has trap-down character, and its process is comparatively slow, and has the feature of accumulation in time.It is the shearing plane of weakness of at section Shangdi, shallow earth's surface fracture plane.The ground fissure activity for simulating with trap-down character causes the Changing Pattern of the stress in high-speed railway subgrade, subgrade deformation destruction region scope and unstability feature, and roadbed and the track interaction between the two, test model case both sides impose horizontal restraint by the supporting construction of steel construction composition, for the ease of observation experiment process wherein a side use supporting construction that steel construction and tempered glass forms as horizontal restraint.
Experiment starts before the lifting jack rising 15cm of all sedimentation bottom platform, in experimentation, model lower wall lifting jack is motionless, on manual control, coil the decline of lifting jack, the displacement boundary conditions that is applied with dish decline is carried out the activity in crack in analog, to investigate the Changing Pattern of the stress in high-speed railway subgrade, subgrade deformation destruction region scope and unstability feature, and the interaction between the two of roadbed and track.
The embodiment of the present invention is by considering the variation of the stress in high-speed railway bridge under the different activity effects of ground fissure, bridge deformation destruction region scope and unstability, and the interaction between the two of bridge and track.The engineering prevention and control of crossing over ground fissure location for high-speed railway bridge provides scientific basis, the predictably harm of crack to high-speed railway bridge more accurately simultaneously.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. a ground fissure harm analogue means, is characterized in that, described device comprises:
Jacking system, for controlling the rising or falling speed of the lifting of ground fissure upper lower burrs and settlement platform, crack activity in analog;
Support system, for supporting the lifting of described jacking system to ground fissure upper lower burrs;
Monitoring system, for monitoring dislocation, distortion and the abutment stress characteristic of high-speed rail bridge model.
2. device as claimed in claim 1, is characterized in that, described jacking system is mainly made up of lifting jack.
3. device as claimed in claim 2, is characterized in that, described upper dish position lifting jack is used for controlling dish in ground fissure and declines, and lower wall position lifting jack is used for supporting described ground fissure lower wall.
4. install as claimed in claim 2 or claim 3, it is characterized in that, the position of described lifting jack is determined by the angle of ground fissure and high-speed railway route.
5. device as claimed in claim 1, is characterized in that, described support system is made up of bottom platform and both sides steel construction side plate.
6. device as claimed in claim 1, is characterized in that, described components and parts mainly comprise Level monitoring, strain transducer and string wire pressure cell.
7. device as claimed in claim 1, is characterized in that, the data of described collection comprise the Level monitoring data of spirit-leveling instrument collection, the strain transducer data of data acquisition system (DAS) collection and the string wire pressure cell data that readout instrument gathers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410067614.1A CN103837359A (en) | 2014-02-21 | 2014-02-21 | Device for simulating harm of activities of ground fissures to high-speed rail bridge |
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| CN201410067614.1A CN103837359A (en) | 2014-02-21 | 2014-02-21 | Device for simulating harm of activities of ground fissures to high-speed rail bridge |
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| CN103837359A true CN103837359A (en) | 2014-06-04 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104964840A (en) * | 2015-07-15 | 2015-10-07 | 福州大学 | Secondary lining arch foot sedimentation experiment loading device and application method |
| CN108680730A (en) * | 2018-06-19 | 2018-10-19 | 长安大学 | Simulator and analogy method are endangered in ground fissure place under a kind of seismic loading |
| CN110954680A (en) * | 2019-12-27 | 2020-04-03 | 长安大学 | Ground fracture test device and method for simulating fracture dislocation and underground water change |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104964840A (en) * | 2015-07-15 | 2015-10-07 | 福州大学 | Secondary lining arch foot sedimentation experiment loading device and application method |
| CN104964840B (en) * | 2015-07-15 | 2017-09-15 | 福州大学 | A kind of secondary lining arch springing sedimentation experiment loading device and its application method |
| CN108680730A (en) * | 2018-06-19 | 2018-10-19 | 长安大学 | Simulator and analogy method are endangered in ground fissure place under a kind of seismic loading |
| CN110954680A (en) * | 2019-12-27 | 2020-04-03 | 长安大学 | Ground fracture test device and method for simulating fracture dislocation and underground water change |
| CN110954680B (en) * | 2019-12-27 | 2022-03-04 | 长安大学 | Ground fracture test device and method for simulating fracture dislocation and underground water change |
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Application publication date: 20140604 |