CN107367598A - By instructing the support pile experimental rig destroyed and method in excavation models experiment - Google Patents
By instructing the support pile experimental rig destroyed and method in excavation models experiment Download PDFInfo
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- CN107367598A CN107367598A CN201710750388.0A CN201710750388A CN107367598A CN 107367598 A CN107367598 A CN 107367598A CN 201710750388 A CN201710750388 A CN 201710750388A CN 107367598 A CN107367598 A CN 107367598A
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Abstract
The invention discloses a kind of support pile experimental rig destroyed in excavation models experiment by instruction and method, for simulating the transmission of foundation pit supporting pile local failure in the longitudinal direction so as to triggering the mechanism continuously destroyed, device includes prefabricated broken pile, magnet, linear bearing, steel shaft, cylinder counter-force block, steel wire rope and cylinder, the prefabricated broken pile includes the upper half stake and lower half stake, the junction center of the upper half stake and lower half stake is respectively fixed with a linear bearing, the steel shaft is slidably connected in the linear bearing, it is used to prevent steel shaft from falling because of deadweight at the top of the steel shaft that the magnet is arranged in the upper half stake；Steel shaft bottom is provided with the piston rod of the cylinder counter-force block and cylinder, the steel wire rope connection steel shaft and the cylinder in the lower half stake, and the prefabricated broken pile is externally provided with the magnetic valve for controlling cylinder.The present invention can accomplish to result of the test disturb it is less, destroyed while different number support piles can be simulated.
Description
Technical field
The present invention relates to a kind of experimental rig in Geotechnical Engineering, in particular it relates to by some in a kind of research foundation ditch
The model test apparatus that foundation ditch caused by support pile destroys locally collapses and continuously collapsed.
Background technology
Made both at home and abroad there occurs a large amount of great foundation ditch collapse accidents, such as the ground such as Singapore, Hangzhou, Cologne in recent years
Into very serious loss.Find that the unstable failure of foundation ditch is an extremely complex process, is especially existed according to these accidents
In the case that foundation ditch is deep, big, flat shape is irregular or supporting construction is complicated, its destruction is probably then by a certain local failure
Cause, and then development evolvement is the pattern of a variety of destructions, it is also possible to drawn by local Support structure damage or local sediment failure
Rise, and then cause periphery supporting construction until the pattern collapsed on a large scale, i.e. the process of collapsing of deep basal pit is a continuous destruction
Process.
According to the record of Singapore's Nicoll Highway subway foundation pit accident destructive process it can be found that growing nearly hundred meters
It is since local most weak position (i.e. 66kV cables ground-connecting-wall from has the position of breach) that foundation ditch, which collapses,.Incident
The same day, ground-connecting-wall indentation, there the 9th support (S335) purlin and support disengage first, and cause herein ground-connecting-wall collapse,
Destroy after stopping 2 minutes, beginning of caving in develops along foundation ditch length direction, until collapsing to outside 100m.A large amount of foundation pit accident hairs
After life, the investigation and summary of many accidents still can ignore the continuous failure mechanism of accident.
In structural engineering field, for the constructions of structures such as multi-rise building, large-span structure and bridge blast, earthquake,
Continuous collapse research under the emergency cases such as fire, shock is more ripe, and research meanses are also very abundant, including theory pushes away
Lead, model test and numerical simulation etc., while many countries and regions are to the progressive collapse-resisting design construction of superstructure
Related specification and directive document.Compared with research with continuously destroying problem in Structural Engineering has been achieved with remarkable break-throughs, mesh
The research that preceding Geotechnical Engineering field is continuously destroyed is also seldom, and does not cause due attention also.
(monolithic stability destruction, overturning, bottom heave destroys and skirt destroys for current foundation ditch stability disruption pattern
Deng) it obviously can not reflect the characteristics of deep basal pit continuously destroys and mechanism, while can not also be carried for the research of its control method
For enough supports, therefore, the generation for destroying this great underground engineering disasters continuous to deep basal pit carries out deep with Evolution Mechanism
Entering research is extremely necessary, only discloses transmission hair of the destruction of local failure initiation along foundation depth, width, length direction
Mechanism and natural termination mechanism are opened up, and establishes the quantitatively evaluating index and evaluation method of evaluation foundation ditch continuous collapse possibility,
Energy proposes to prevent the theory and design method of foundation pit supporting construction progressive collapse-resisting.
The problem of due to the continuous destruction of deep basal pit being a large deformation, non-linear, multi- scenarios method, existing limiting equilibrium
The methods of method, limit analysis method, conventional elasto-plastic finite element method and Strength Reduction Method, which can only mostly be related to foundation ditch, to destroy
Critical condition, as the development and differentiation destroyed after starting, these conventional methods are difficult to simulate and describe.Therefore, it is
Continuously damage study means are also badly in need of for the continuous destruction of research deep basal pit, rational large deformation computational methods and model test etc.
Explore.
The content of the invention
The invention aims to overcome deficiency of the prior art, there is provided a kind of to pass through finger in excavation models experiment
The support pile experimental rig destroyed and method are made, solves and asking for local support pile destruction is simulated in continuous damage model test
Topic, it can accomplish less to result of the test disturbance；The present invention not waited using number simultaneously, can simulate different number support piles
While destroy.
The purpose of the present invention is achieved through the following technical solutions：
A kind of support pile experimental rig destroyed in excavation models experiment by instruction, for simulating foundation pit supporting pile office
Portion destroys transmission in the longitudinal direction so as to trigger the mechanism continuously destroyed, including prefabricated broken pile, magnet, linear bearing, steel
Axle, cylinder counter-force block, steel wire rope and cylinder, the prefabricated broken pile include the upper half stake and lower half stake, the upper half stake and
The junction center of lower half stake is respectively fixed with a linear bearing, and the steel is slidably connected in the linear bearing
Axle, the steel shaft top that the magnet is arranged in the upper half stake are used to prevent steel shaft from falling because of deadweight；The lower half stake
Interior steel shaft bottom is provided with the piston rod of the cylinder counter-force block and cylinder, the steel wire rope connection steel shaft and the cylinder, described
Prefabricated broken pile is externally provided with the magnetic valve for controlling cylinder.
Further, the frictional force between the steel shaft and the linear bearing is less than the gravity of steel shaft.
Further, failure test while different number support piles can be simulated by adjusting the experimental rig quantity.
Further, the prefabricated broken pile is made up of aluminum, irony, stainless steel or PVC any materials therein
Rectangular configuration.
By instructing the experimental method of the support pile experimental rig destroyed in excavation models experiment, comprise the following steps：
(1) the upper half stake and lower half stake are docked, steel shaft is held by magnet, experimental rig and common support pile are put
Put in foundation ditch precalculated position, prepare model test soil body；
(2) debug, set up test monitoring equipment, carry out testing the normal excavation stage, experimental rig is total to common support pile
With cantilever style campshed supporting is formed, stop excavating and monitoring after excavating desired depth；
(3) air inlet of magnetic valve is connected into cylinder, cylinder is pressurized to predetermined pressure, opens cylinder gas outlet；
(4) power of electromagnetic valve, the upper half stake and lower half are connected by after the completion of test monitoring equipment debugging, erection again
Stake separation, because soil pressure acts on after stake, the upper half stake is collapsed into foundation ditch.
Compared with prior art, beneficial effect caused by technical scheme is：
1. realize the controllability that pile body invalid position during local failure occurs for Row Piles Supporting Structure.
2. using different number of experimental rig of the present invention simultaneously, and it is arranged according to simulation demand, it is possible to achieve no
Destroyed while same quantity, diverse location support pile.
3. realizing crash simulation of the support pile under different excavation of foundation pit depth, soil pressure in excavation models experiment is overcome
The smaller contradiction with support pile intensity between higher of power.
4. using the steel shaft connection broken pile of carry magnet, it is ensured that the Model Pile destroyed before occurring, which has, meets supporting demand
Strength and stiffness.
5. realizing the acceptable instruction of Model Pile by control of the magnetic valve to cylinder inner push-rod to fracture, examination can be made
Part destroys in the range of less load.
It is practical reliable 6. apparatus of the present invention overall structure is simple, it is easy to operation and be easily achieved, for simulating excavation
And under smaller soil disturbance Row Piles Supporting Structure destructive process model investigation it is significant.
Brief description of the drawings
Fig. 1 is schematic cross-section when the upper and lower half stake of the present invention links together；
Fig. 2 is schematic diagram when upper lower half stake separates after cylinder of the present invention is released；
Foundation ditch schematic diagram when Fig. 3 is present invention experiment；
Reference：1st, the upper half stake, 2, magnet, 3, linear bearing, 4, lower half stake, 5, steel shaft, 6, steel wire rope, 7, gas
Cylinder counter-force block, 8, cylinder, 9, magnetic valve
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.
As shown in Figure 1 to Figure 3, in simulation foundation ditch local failure and the model test continuously destroyed, complete model examination
Test the rectangular pile that prefabricated broken pile is usually the plastic materials such as aluminum, irony, stainless steel or PVC.Because excavation models test size
Much smaller than the size of Practical Project, the soil pressure suffered by support pile is smaller, therefore complete support pile is difficult the institute in model test
Destroyed in the range of the load being subject to.It is locally broken that the support pile that receiving instruction destroys can be used in simulation foundation pit supporting pile
Bad transmission in the longitudinal direction is so as to triggering the mechanism continuously destroyed.In the normal excavation stage of foundation ditch experiment, prefabricated broken pile
Including the upper half stake 1 and lower half stake 4, the junction center of the upper half stake 1 and lower half stake 4 is respectively fixed with one directly
Bobbin holds 3, and steel shaft 5 is slidably connected in linear bearing 3, and the top of steel shaft 5 that magnet 2 is arranged in the upper half stake 1 is used to prevent
Steel shaft 5 is fallen because of deadweight；The bottom of steel shaft 5 is provided with cylinder counter-force block 7 and cylinder 8 in lower half stake 4, and steel wire rope 6 connects cylinder
Piston rod and steel shaft 5, prefabricated broken pile are externally provided with the magnetic valve 9 for controlling cylinder.
Steel shaft 5 is to transmit the moment of flexure between upper and lower half stake, and its stress and deformation characteristic are close to complete model stake；Just
After the normally opened digging stage terminates, by controlling magnetic valve 9 to inflate cylinder moment, cylinder push-rod ejects immediately, will by steel wire rope 6
Steel shaft 5 draws in lower half stake, and the upper half stake 1 and the two-section stake of lower half stake 4 disconnect, and the broken of foundation ditch part support pile is simulated with this
It is bad.
The step of being tested by experimental rig of the present invention is as follows：
1. upper and lower half stake is docking together, steel shaft, then apparatus of the present invention by some numbers are held with upper magnet
Foundation ditch precalculated position is placed on common support pile, prepares model test soil body；
2. debugging, setting up test monitoring equipment, test the normal excavation stage, now of the invention and common support pile one
Rise and form cantilever style campshed supporting, stop excavating after normally excavating to desired depth and monitor；
3. the air inlet of magnetic valve is connected into upper cylinder, cylinder is pressurized to predetermined pressure, opens cylinder gas outlet；
4. connect power of electromagnetic valve, the upper and lower half stake of the present invention by after the completion of test monitoring equipment debugging, erection again
Separation, because soil pressure acts on after stake, the upper half stake is collapsed into foundation ditch.
Above for the experimental rig simulate foundation ditch local failure application method, by the present invention with experiment in monitoring stake,
Soil pressure cell and subsequent burst stake are used in conjunction with, and are successfully simulated transmittance process and termination situation that foundation ditch continuously destroys, are drawn
The mechanism of load transmission when foundation ditch continuously destroys.
The present invention is not limited to embodiments described above.The description to embodiment is intended to describe and said above
Bright technical scheme, above-mentioned embodiment is only schematical, is not restricted.This is not being departed from
In the case of invention objective and scope of the claimed protection, one of ordinary skill in the art may be used also under the enlightenment of the present invention
The specific conversion of many forms is made, these are belonged within protection scope of the present invention.
Claims (5)
1. by instructing the support pile experimental rig destroyed in excavation models experiment, for simulating foundation pit supporting pile local failure
Transmission in the longitudinal direction is so as to triggering the mechanism continuously destroyed, it is characterised in that including prefabricated broken pile, magnet, linear axis
Hold, steel shaft, cylinder counter-force block, steel wire rope and cylinder, the prefabricated broken pile include the upper half stake and lower half stake, described the upper half
The junction center of stake and lower half stake is respectively fixed with a linear bearing, is slidably connected in the linear bearing
Steel shaft is stated, is used to prevent steel shaft from falling because of deadweight at the top of the steel shaft that the magnet is arranged in the upper half stake；The lower half
The piston rod that steel shaft bottom in stake is provided with the cylinder counter-force block and cylinder, the steel wire rope connection steel shaft and the cylinder is cut,
The prefabricated broken pile is externally provided with the magnetic valve for controlling cylinder.
2. according to claim 1 by instructing the support pile experimental rig destroyed in excavation models experiment, its feature exists
In the frictional force between the steel shaft and the linear bearing is less than the gravity of steel shaft.
3. according to claim 1 by instructing the support pile experimental rig destroyed in excavation models experiment, its feature exists
In failure test while can simulating different number support piles by adjusting the experimental rig quantity.
4. according to claim 1 by instructing the support pile experimental rig destroyed in excavation models experiment, its feature exists
In the prefabricated broken pile is the rectangular configuration being made up of aluminum, irony, stainless steel or PVC any materials therein.
5. according to claim 1 by the experiment side for the support pile experimental rig for instructing destruction in excavation models experiment
Method, it is characterised in that comprise the following steps：
(1) the upper half stake and lower half stake are docked, steel shaft is held by magnet, experimental rig and common support pile are placed on
Foundation ditch precalculated position, prepares model test soil body；
(2) debug, set up test monitoring equipment, test the normal excavation stage, experimental rig and the common structure of common support pile
Into cantilever style campshed supporting, stop excavating and monitor after excavating desired depth；
(3) air inlet of magnetic valve is connected into cylinder, cylinder is pressurized to predetermined pressure, opens cylinder gas outlet；
(4) power of electromagnetic valve, the upper half stake and lower half stake point are connected by after the completion of test monitoring equipment debugging, erection again
From because soil pressure acts on after stake, the upper half stake is collapsed into foundation ditch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710750388.0A CN107367598A (en) | 2017-08-28 | 2017-08-28 | By instructing the support pile experimental rig destroyed and method in excavation models experiment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710750388.0A CN107367598A (en) | 2017-08-28 | 2017-08-28 | By instructing the support pile experimental rig destroyed and method in excavation models experiment |
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| CN107367598A true CN107367598A (en) | 2017-11-21 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110158674A (en) * | 2019-06-14 | 2019-08-23 | 天津大学 | A kind of experimental rig and method of achievable pile foundation coupling between bending and extension |
| CN111933018A (en) * | 2020-06-12 | 2020-11-13 | 同创工程设计有限公司 | Method for demonstrating pile breaking and reinforcing effects of immersed tube cast-in-place pile |
| CN113417325A (en) * | 2021-07-30 | 2021-09-21 | 西南交通大学 | Underpinning test device and method for shield underpinning bridge pile foundation |
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| CN105926686A (en) * | 2016-04-30 | 2016-09-07 | 山东大学 | Centrifugal model testing system and method studying common character of composite foundation and support structure |
| CN207148105U (en) * | 2017-08-28 | 2018-03-27 | 天津大学 | By instructing the support pile experimental rig destroyed in excavation models experiment |
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Patent Citations (2)
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| CN105926686A (en) * | 2016-04-30 | 2016-09-07 | 山东大学 | Centrifugal model testing system and method studying common character of composite foundation and support structure |
| CN207148105U (en) * | 2017-08-28 | 2018-03-27 | 天津大学 | By instructing the support pile experimental rig destroyed in excavation models experiment |
Non-Patent Citations (2)
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| 程雪松;郑刚;黄天明;邓楚涵;聂东清;刘杰;: "悬臂排桩支护基坑沿长度方向连续破坏的机理试验研究" * |
| 郑刚;雷亚伟;程雪松;李溪源;王若展;: "局部锚杆失效对桩锚基坑支护体系的影响及其机理研究" * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110158674A (en) * | 2019-06-14 | 2019-08-23 | 天津大学 | A kind of experimental rig and method of achievable pile foundation coupling between bending and extension |
| CN110158674B (en) * | 2019-06-14 | 2021-03-16 | 天津大学 | Testing device and method capable of realizing pile foundation stretch bending coupling |
| CN111933018A (en) * | 2020-06-12 | 2020-11-13 | 同创工程设计有限公司 | Method for demonstrating pile breaking and reinforcing effects of immersed tube cast-in-place pile |
| CN111933018B (en) * | 2020-06-12 | 2021-11-26 | 同创工程设计有限公司 | Method for demonstrating pile breaking and reinforcing effects of immersed tube cast-in-place pile |
| CN113417325A (en) * | 2021-07-30 | 2021-09-21 | 西南交通大学 | Underpinning test device and method for shield underpinning bridge pile foundation |
| CN113417325B (en) * | 2021-07-30 | 2022-07-29 | 中国水利水电第四工程局有限公司 | Underpinning test device and method for shield underpinning bridge pile foundation |
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