CN107761785A - A kind of default section support pile experimental rig for simulating different bending strengths - Google Patents
A kind of default section support pile experimental rig for simulating different bending strengths Download PDFInfo
- Publication number
- CN107761785A CN107761785A CN201710799735.9A CN201710799735A CN107761785A CN 107761785 A CN107761785 A CN 107761785A CN 201710799735 A CN201710799735 A CN 201710799735A CN 107761785 A CN107761785 A CN 107761785A
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- Prior art keywords
- stake
- pile
- foundation ditch
- support pile
- hinge
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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
Abstract
The invention discloses a kind of default section support pile experimental rig for simulating different bending strengths, the process continuously destroyed for simulating foundation pit supporting pile, including prefabricated broken pile, pad, nut, band eye nylon bolt, hinge fastener, hinge and steel wire rope, the upper half stake and lower half stake are divided into by default stake section in the middle part of the prefabricated broken pile, it is connected between the upper half stake and lower half stake on the inside of foundation ditch by the hinge fastener with hinge, the band eye nylon bolt is installed respectively in the upper half stake and lower half stake on the outside of foundation ditch, bolt eye with eye nylon bolt described in the steel wire penetrating is simultaneously fixed by the pad and nut.The present invention can simulate the process that foundation ditch continuously destroys in the excavation of foundation pit stage as common support pile normal work after default support pile fracture of breaking.
Description
Technical field
The present invention relates to a kind of experimental rig in Geotechnical Engineering, specifically, for some supportings in a kind of simulation foundation ditch
Stake is destroyed and causes the device that foundation ditch continuously collapses, and the transport mechanism that foundation ditch continuously destroys can be drawn by this device.
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.
At present by the research of large-scale physical model test, numerical simulation, and by setting the support pile mould that can break
Intended the process that foundation ditch locally collapses, it is found that the growth of adjacent support pile moment of flexure certain multiple can be caused by foundation ditch locally collapses, but
Rectangle PVC stake intensity used in pre-stage test is too big, can not simulate the process of foundation ditch continuous collapse, needs further exploratory experiment side
Method, to simulate the process of foundation ditch continuous collapse.
The content of the invention
The invention aims to overcome deficiency of the prior art, solve simulation in model test and locally propped up by foundation ditch
The problem of fender pile destroys and triggers foundation pit supporting pile continuously to destroy along its length, there is provided a kind of to simulate the pre- of different bending strengths
If section support pile experimental rig, the present invention can be in the excavation of foundation pit stage as common support pile normal work, default
The process that foundation ditch continuously destroys can be simulated after the support pile that can break fracture.
The purpose of the present invention is achieved through the following technical solutions：
A kind of default section support pile experimental rig for simulating different bending strengths, continuously breaks for simulating foundation pit supporting pile
Bad process, including prefabricated broken pile, pad, nut, band eye nylon bolt, hinge fastener, hinge and steel wire rope, it is described prefabricated
The upper half stake and lower half stake are divided into by default stake section in the middle part of broken pile, the upper half stake and lower half stake on the inside of foundation ditch
Between be connected by the hinge fastener with hinge, installed respectively in the upper half stake and lower half stake on the outside of foundation ditch
The band eye nylon bolt, the bolt eye with eye nylon bolt described in the steel wire penetrating are simultaneously consolidated by the pad and nut
It is fixed.
Further, by prefabricated broken pile on the inside of foundation ditch it is different with the stress on the outside of foundation ditch, be respectively divided into compression-side and
Tension side.
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.
Compared with prior art, beneficial effect caused by technical scheme is：
1. by presetting truncation surface, and the compression-side of two-section broken pile is utilized into hinge connection, and tension side utilizes finer wire
Rope connection, simulate Row Piles Supporting Structure and destroyed in initial local support pile and trigger the destruction for closing on support pile, realize continuous
The simulation of destruction.
2. the tensile strength by adjusting steel wire rope simulates the ultimate tensile strength of support pile, actual condition and root can be combined
The intensity of demand regulation support pile is factually tested, and it is continuous broken to realize that support pile is triggered under horizontal soil arching effect by local failure
It is bad.
3. prefabricated broken pile compression-side is hinged, hinge can both undertake the shearing of this default section part, prevent from being cut
Destroy, can freely be rotated when this section reaches capacity moment of flexure, generation destruction again, simulation stake fractures；
4. support pile is realized under moment of flexure control due to simulation that loading effect and Unloading Effect destroy.
It is practical reliable 5. apparatus of the present invention overall structure is simple, it is easy to operation and be easily achieved, for simulating excavation
And support pile local failure triggers the model investigation continuously destroyed to have great importance.
Brief description of the drawings
Fig. 1 is schematic diagram of the present invention and its partial enlargement cross section structure diagram；
Fig. 2-1 and Fig. 2-2 is respectively apparatus of the present invention tension side, the positive structure diagram of compression-side；
Fig. 3 is the foundation ditch schematic diagram of the present invention at the trial.
Each device is in figure:1st, pad, 2, nut, 3, band eye nylon bolt, 4, hinge fastener, 5, hinge, 6, steel wire
Rope, 7, the upper half stake, 8, lower half stake
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.
As shown in Figure 1 to Figure 3, a kind of default section support pile experimental rig for simulating different bending strengths, for simulating
The process that foundation pit supporting pile continuously destroys, including prefabricated broken pile, pad 1, nut 2, band eye nylon bolt 3, hinge fastener 4,
Hinge 5 and steel wire rope 6, prefabricated broken pile middle part is divided into the upper half stake 7 and lower half stake 8 by default stake section, in foundation ditch
It is connected between the upper half stake 7 and lower half stake 8 of side by hinge fastener 4 with hinge 5, the upper half on the outside of foundation ditch
Installation band eye nylon bolt 3, steel wire rope 6 pass through the bolt eye with eye nylon bolt 3 and passed through respectively in stake 7 and lower half stake 8
Pad 1 and nut 2 are fixed.
Application method of the apparatus of the present invention during experiment is as follows：
1. upper and lower half stake is docking together, it is connected with hinge fastener with hinge, the compression of lower half stake
Side, with the screw eye of the steel wire penetrating band eye nylon bolt of some strength, nut is tightened, form a complete present invention tool
Body implementation.
2. the present invention of certain amount is placed on into pre-position again, model test soil body is prepared.
3. debugging, after setting up test monitoring equipment, carry out testing normal excavation, now apparatus of the present invention and remaining support pile
Cantilever style campshed supporting is formed together, stops excavating after normal excavation to desired depth, and detect every Testing index.
4. the default initial destruction stake of control destroys, simulation foundation ditch part support pile collapses, and triggers some basic hairs
Bright device fracture, until continuous collapse stops.
In specific implementation process, the present invention selects rectangle PVC stakes by certain rigidity likelihood ratio, presets support pile section,
And define that prefabricated broken pile is located on the inside of foundation ditch, outside is respectively compression-side, tension side by pile body stress, in the normal of foundation ditch experiment
Excavation stage, tension side are transmitted the axle power between broken pile up and down by hinge by the axle power between broken pile above and below wire rope transfers, compression-side
With shearing, the present invention of certain amount is disposed adjacent to default local failure opening position, i.e., the intact support pile one with remaining
It is same to constitute cantilever style Row Piles Supporting Structure；After the normal excavation stage terminates, by controlling the support pile that can break to be broken to foundation ditch
Local support pile is destroyed and simulated, and thus triggers the growth for destroying close position pile body stress of the present invention, tension side steel wire rope
Break, the upper half stake of the present invention is collapsed into foundation ditch, the continuous collapse for having triggered foundation pit supporting pile is destroyed by local support pile, directly
It is finally stopped to collapsing.
The application method of foundation ditch local failure is simulated for the experimental rig above, can by pasting foil gauge in the present invention
For measuring bending；Made jointly by the present invention and monitoring stake, soil pressure cell, the default support pile that can break in experiment
With can successfully simulate transmission and termination that foundation ditch continuously destroys, draw the mechanism of load transmission when foundation ditch continuously destroys.
It is of the invention compared with existing experimental rig, its difference is：
Connected, can be combined using seizing wire by default stake section, and by the tension side that two sections of stakes are upper and lower half stake
Actual condition is simultaneously securely fixed according to the intensity of experiment demand regulation support pile, steel wire rope in stake section both sides using nut
Stake surface, can avoid sliding in tension.And the compression-side of prefabricated broken pile is hinged, hinge can both undertake this default stake and break
Shearing at face, sheared destruction is prevented, can freely be rotated when this section reaches capacity moment of flexure, generation destruction again, simulate stake
Fracture, this is that existing model support pile institute is irrealizable.The conventional support pile of existing foundation ditch experiment often uses aluminum or hard PVC
Rectangular tube is simulated, but complete PVC Model Pile intensity is higher, can not be suffered in the continuous damage model test of campshed supporting foundation pit
To load in the range of destroy.And the present invention can realize that initial local support pile destroys and trigger the broken of neighbouring support pile
It is bad, that is, continuous crash simulation is realized, and it is continuous broken to realize that support pile is triggered under horizontal soil arching effect by local failure
It is bad.
Apparatus of the present invention are ingenious in design, simple but powerful, easy to operation, test the favorable repeatability of process, energy
Enough meet the needs of various sand class excavation models experiments.
Although the experiment process of the present invention is described above, the present invention is not limited to above-mentioned using function
Embodiment, above-mentioned embodiment is only schematical, is not restricted, the common skill of this area
Art personnel are under the enlightenment of the present invention, can be with the case of present inventive concept and scope of the claimed protection is not departed from
The model test that other supporting construction foundation ditches continuously destroy is used it for, these belong to protection scope of the present invention.
Claims (4)
1. a kind of default section support pile experimental rig for simulating different bending strengths, is continuously destroyed for simulating foundation pit supporting pile
Process, it is characterised in that including prefabricated broken pile, pad, nut, band eye nylon bolt, hinge fastener, hinge and steel wire
Rope, the prefabricated broken pile middle part are divided into the upper half stake and lower half stake by default stake section, the upper half on the inside of foundation ditch
It is connected between stake and lower half stake by the hinge fastener with hinge, the upper half stake and lower half on the outside of foundation ditch
The band eye nylon bolt is installed respectively, the bolt eye with eye nylon bolt described in the steel wire penetrating and by described in stake
Pad and nut are fixed.
2. a kind of default section support pile experimental rig for simulating different bending strengths, its feature exist according to claim 1
In, by prefabricated broken pile on the inside of foundation ditch it is different with the stress on the outside of foundation ditch, be respectively divided into compression-side and tension side.
3. a kind of default section support pile experimental rig for simulating different bending strengths, its feature exist according to claim 1
In failure test while can simulating different number support piles by adjusting the experimental rig quantity.
4. a kind of default section support pile experimental rig for simulating different bending strengths, its feature exist according to claim 1
In the prefabricated broken pile is the rectangular configuration being made up of aluminum, irony, stainless steel or PVC any materials therein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710799735.9A CN107761785A (en) | 2017-09-07 | 2017-09-07 | A kind of default section support pile experimental rig for simulating different bending strengths |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710799735.9A CN107761785A (en) | 2017-09-07 | 2017-09-07 | A kind of default section support pile experimental rig for simulating different bending strengths |
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| CN107761785A true CN107761785A (en) | 2018-03-06 |
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| CN201710799735.9A Pending CN107761785A (en) | 2017-09-07 | 2017-09-07 | A kind of default section support pile experimental rig for simulating different bending strengths |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112482393A (en) * | 2020-11-19 | 2021-03-12 | 山东建筑大学 | Pile-soil nail-surface layer combined supporting system and using method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140125657A1 (en) * | 2012-11-01 | 2014-05-08 | Fluor Technologies Corporation | Three Dimensional Modeling And Drawing Extraction Tool |
| CN208183816U (en) * | 2017-09-07 | 2018-12-04 | 天津大学 | A kind of default section support pile experimental rig for simulating different bending strengths |
-
2017
- 2017-09-07 CN CN201710799735.9A patent/CN107761785A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140125657A1 (en) * | 2012-11-01 | 2014-05-08 | Fluor Technologies Corporation | Three Dimensional Modeling And Drawing Extraction Tool |
| CN208183816U (en) * | 2017-09-07 | 2018-12-04 | 天津大学 | A kind of default section support pile experimental rig for simulating different bending strengths |
Non-Patent Citations (1)
| Title |
|---|
| 程雪松等: "悬臂排桩支护基坑沿长度方向连续破坏的机理试验研究", 《岩土工程学报》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112482393A (en) * | 2020-11-19 | 2021-03-12 | 山东建筑大学 | Pile-soil nail-surface layer combined supporting system and using method thereof |
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