CN103352482A - Pile type reinforced embankment plane soil arch effect testing device - Google Patents

Pile type reinforced embankment plane soil arch effect testing device Download PDF

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Publication number
CN103352482A
CN103352482A CN2013102832455A CN201310283245A CN103352482A CN 103352482 A CN103352482 A CN 103352482A CN 2013102832455 A CN2013102832455 A CN 2013102832455A CN 201310283245 A CN201310283245 A CN 201310283245A CN 103352482 A CN103352482 A CN 103352482A
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water
embankment
base
water bag
skirt piles
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CN2013102832455A
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Chinese (zh)
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曹卫平
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Xian University of Architecture and Technology
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Xian University of Architecture and Technology
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Priority to CN2013102832455A priority Critical patent/CN103352482A/en
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Abstract

The invention discloses a pile type reinforced embankment plane soil arch effect testing device which comprises a base in a rectangular box frame shape. Two parallel side piling beams are arranged at the bottom of the hollow portion inside the base, the side piling beams are arranged tightly close to the base, a middle piling beam which is parallel to the side piling beams is arranged between the two side piling beams, the top face of the middle piling beam is flush with the top faces of the side piling beams, four tempered glass plates form a rectangular space in a defined mode and are installed on the base, the spaces between the middle piling beam and the side piling beams are respectively provided with a water bag, a plurality of aluminium alloy strips are fixed on the upper surface of each water bag, a plurality of soil pressure boxes are arranged on the middle piling beam and the upper surfaces of the water bags, embankment fillings are filled above the soil pressure boxes, and a displacement meter is arranged on the top faces of the embankment fillings. After water is filled in the rubber water bags, the water bags conduct filling on the embankment fillings in a layer-by-layer mode, and after incompressibility of water enables the embankment fillings to reach the reserved height, the relative displacement of pile soil is always zero. Sedimentation of weak soil is simulated in a gradual water draining mode, and the relative displacement of the pile soil can be precisely controlled.

Description

Geosynthetic reinforced pile supported embankments on soft soil plane soil arching effect experimental rig
[technical field]
The present invention relates to a kind of experimental rig, particularly a kind of experimental rig of measuring Piled Embankments plane soil arching effect.
[background technology]
Geosynthetic reinforced pile supported embankments on soft soil by embankment fill material, one or more layers horizontal reinforcing body, independently pile cover and rigid pile form one by one, have advantages of that embankment total settlement and relative settlement are little, the duration is short, embankment stability is high.Soil arching effect has important impact to embankment load metamorphism proterties.The generation of the native relative displacement of stake is the basic reason that occurs soil arching effect in the embankment.The at present normal sedimentation of adopting foams plastic material simulation weak soil under load action, to produce in the laboratory test, but the size of its distortion, time are uncontrollable.
[summary of the invention]
The object of the present invention is to provide a kind of geosynthetic reinforced pile supported embankments on soft soil plane soil arching effect experimental rig, when having the sedimentation that the simulation weak soil produces in the experimental rig now to solve under load action, the size of distortion, uncontrollable problem of time; The present invention can disclose the Changing Pattern of pile-soil stress, determines the heavy face height such as plane soil arch.
To achieve these goals, the technical solution adopted in the present invention is:
Geosynthetic reinforced pile supported embankments on soft soil plane soil arching effect experimental rig, comprise base, base is a rectangular box, and the bottom of its inner hollow part is provided with two parallel skirt piles beams, the skirt piles beam is near the base setting, and the centre of two skirt piles beams is provided with the central pile beam with skirt piles Liangping row; The end face of the end face of central pile beam and skirt piles beam flushes; Four angle steel are embedded in four interior angles of base, are connected to form an angle iron frame between four angle steel, and four armorplate glasses are connected with angle iron frame; Four armorplate glasses surround a coffin; Space between central pile beam and two the skirt piles beams respectively is provided with a water bag; The water bag upper surface is fixed with some aluminum alloy bars; Be furnished with a plurality of earth pressure cells at central pile beam and water bag upper surface; Be filled with embankment fill material in the coffin that four armorplate glasses in a plurality of earth pressure cells top surround, the end face of embankment fill material is furnished with displacement meter.
The present invention further improves and is: earth pressure cell connects the readout instrument that is positioned at chassis outer side.
The present invention further improves and is: described aluminum alloy bar and central pile Liangping row.
The present invention further improves and is: be provided with horizontal reinforcing body between earth pressure cell and the embankment fill material; This horizontal reinforcing body is fixed on the skirt piles beam.
The present invention further improves and is: described embankment fill material adopts the funnel placement in layers, whenever completes one deck with the spirit level leveling and uses the pressing plate densification, then repaves and fills out lower one deck embankment fill material, until predetermined altitude.
The present invention further improves and is: after the end face that water bag is filled with water to the end face of its upper surface and central pile beam and skirt piles beam flushes, again at water bag upper surface layout aluminum alloy bar and earth pressure cell; And then filling embankment fill material.
The present invention further improves and is: during test, the water in the water bag is outwards emitted one by one, each two water bags are emitted the water of equal volume with identical speed; Rear measurement each earth pressure cell reading and Embankment Subsidence discharge water at every turn.
The present invention further improves and is: base, skirt piles beam and central pile beam all adopt brick forming, and connect into an integral body.
The present invention further improves and is: water bag adopts rubber bag tank to be made.
With respect to prior art, the beneficial effect that the present invention has is:
1) the present invention adopts the rubber water bag to be full of behind the water successively railway embankment using filler, and the Incoercibility of water is so that embankment native relative displacement of stake to the predetermined altitude is always zero; More crucial is, simulates the sedimentation of weak soil by the mode that discharges water gradually, can accurately control the native relative displacement of stake; It is the prerequisite that soil arching effect occurs that the present invention has disclosed the native relative displacement of stake.
2) the present invention has disclosed the Changing Pattern of Piled Embankments stress ratio with the relative displacement of stake soil.Exist the relative displacement of a Critical Pile soil so that stress ratio is maximum.
3) the present invention has determined the heavy face height such as plane soil arch embankment.
[description of drawings]
Fig. 1 is the schematic diagram of experimental facilities of the present invention;
Fig. 2 is the sectional view along A-A line among Fig. 1.
Among the figure: 1, base, 2, the central pile beam, 3, the skirt piles beam, 4, water bag, 5, armorplate glass, 6, slotted-angle shelving, 7, earth pressure cell, 8, horizontal reinforcing body, 9, embankment fill material, 10, displacement meter.
[specific embodiment]
The invention will be further described below in conjunction with drawings and Examples.
See also illustrated in figures 1 and 2, geosynthetic reinforced pile supported embankments on soft soil of the present invention plane soil arching effect experimental rig comprises base 1, central pile beam 2, skirt piles beam 3, water bag 4, armorplate glass 5, angle steel 6, earth pressure cell 7, horizontal reinforcing body 8, embankment fill material 9, displacement meter 10 and readout instrument.
Base 1 is a rectangular box, and the bottom of its inner hollow part is provided with two parallel skirt piles beams 3, and skirt piles beam 3 arranges near base 1, and the centre of two skirt piles beams 3 is provided with 2, two skirt piles beams 3 of central pile beam and central pile beam 2 consists of " day " font; The end face of the end face of central pile beam 2 and skirt piles beam 3 flushes.The end face of skirt piles beam 3 is lower than the end face of base 1, between the end face of skirt piles beam 3 and base 1, form groove, four angle steel 6 are embedded in four interior angles of base 1, adopt welding to form an angle iron frame between four angle steel 6, four armorplate glasses 5 are connected with bolt with angle iron frame, and four armorplate glasses 5 surround a coffin; Central pile beam 2 and two skirt piles beam 3 amongs are provided with a water bag 4; With the rubber water pipe ordered arrangement that is connected on the water bag 4, then to water bag 4 water-fillings, water bag 4 upper surfaces are flushed with the end face of central pile beam 2 and the end face of skirt piles beam 3, then valve-off, arrange aluminum alloy bar at water bag 4 upper surfaces, aluminum alloy bar and water bag 4 cement, arrange a plurality of earth pressure cells 7 at central pile beam 2 and water bag 4 upper surfaces, then in the coffin that four armorplate glasses 5 surround, fill embankment fill material 9, embankment fill material 9 adopts the funnel placement in layers, whenever completes one deck with the spirit level leveling and uses the pressing plate densification, then repaves and fills out lower one deck embankment fill material, reach predetermined altitude, arrange displacement meter 10 at embankment fill material 9 apical view measuring point places.Then water bag 4 outwards discharges water one by one, and each two water bags 4 are emitted the water of equal volume with identical speed, measure each earth pressure cell 7 readings and Embankment Subsidence after discharging water again, the process of repeat that above-mentioned water bag discharges water, soil pressure and Embankment Subsidence being measured.In the embankment process, the water in the water bag 4 is not released, and can be used for simulating the quick preloading process of Practical Project; After embankment was complete, the water in the water bag was emitted gradually, and the water bag upper surface descends, and can with the very long process of consolidation of the actual ground of velocity simulate faster, shorten test period.
The layout of aluminum alloy bar is parallel with central pile beam 2, aluminum alloy bar the distortion of restriction water bag when discharging water be set, make the sedimentation of water bag 4 upper surfaces be similar to the distortion of one-way slabs under transverse load, can well simulate the plane soil arching effect, and its size and quantity are according to the required setting of test.
The weight of pressing plate is according to the setting of test needs, and the coffin internal diameter in the size of pressing plate and four armorplate glass 5 besieged cities coincide.
The volume that water bag 4 is emitted water is used for calculating the native relative displacement of stake, and concrete test is concrete calculates.
The range of earth pressure cell 7, displacement meter 10 and precision are determined according to test requirements document.
Base 1, skirt piles beam 3 and central pile beam 2 all adopt brick forming, and connect into an integral body.Base 1, skirt piles beam 3 and central pile beam 2 are bases of whole experimental rig, prevent that water bag from outwards expanding under embankment loading.Water bag 4 adopts rubber bag tank to be made, and is the core position of whole experimental rig, the vertical load that skirt piles beam 3, central pile beam 2 and water bag 4 shared embankment fill materials 9 transmit.The setting of horizontal reinforcing body 8 and its material property should be determined according to the requirement of test, should be laid on earth pressure cell 7 tops, and be fixed on the skirt piles beam 3 with band iron and expansion bolt.For the embankment fill material 9 that makes all tests all has close unit weight, adopt placement in layers, every layer of embankment completes the rear pressing plate densification of using.
Build the size of needed base 1, skirt piles beam 3 and central pile beam 2 according to test requirements document by laying bricks or stones, make the rubber water bag 4 of corresponding size, guarantee between water bag 4 and the base 1 very close to each other.At base 1 reservation seam, so that angle steel 6 just in time is embedded in the base 1 with the truss that armorplate glass 5 forms, guarantee the firm of integral body.With the rubber water pipe ordered arrangement that is connected on the water bag 4, then to water bag 4 water-fillings, water bag 4 upper surfaces are flushed with skirt piles beam 3 and central pile beam 2 end faces, then valve-off, arrange aluminum alloy bar at the water bag upper surface, cement with water bag, at central pile beam 2 and water bag 4 upper surfaces earth pressure cell 7 is set, adopt double faced adhesive tape that earth pressure cell 7 bottom surfaces and skirt piles beam 3 and central pile beam 2 and water bag 4 upper surfaces are clinged, earth pressure cell 7 is connected by the outer readout instrument of wire and test flume, in the embankment process, read the reading of readout instrument, can obtain the relation between soil pressure and the depth of fill.Behind predetermined altitude, arrange displacement meter 10 at embankment apical view measuring point until embankment, can obtain the relation between whole process of the test embankment end face sedimentation and the native relative displacement of stake.Embankment is filled out predetermined altitude, and water bag 4 discharges water one by one, by reading the reading of readout instrument, can obtain the relation between in the process of discharging water soil pressure and the native relative displacement of stake.When the relative displacement of stake soil is larger, and during the sedimentation of embankment end face indifference, show the heavy face height such as appearance, off-test.
The above-mentioned specific embodiment is used for the present invention that explains, rather than limits the invention, and in the protection domain of spirit of the present invention and claim, any modification and change to the present invention makes all fall into protection scope of the present invention.

Claims (9)

1. geosynthetic reinforced pile supported embankments on soft soil plane soil arching effect experimental rig, it is characterized in that: comprise base (1), base (1) is a rectangular box, the bottom of its inner hollow part is provided with parallel two skirt piles beams (3), skirt piles beam (3) arranges near base (1), and the centre of two skirt piles beams (3) is provided with the central pile beam (2) parallel with skirt piles beam (3); The end face of the end face of central pile beam (2) and skirt piles beam (3) flushes; Four angle steel (6) are embedded in four interior angles of base (1), are connected to form an angle iron frame between four angle steel (6), and four armorplate glasses (5) are connected with angle iron frame; Four armorplate glasses (5) surround a coffin; Space between central pile beam (2) and two the skirt piles beams (3) respectively is provided with a water bag (4); Water bag (4) upper surface is fixed with some aluminum alloy bars; Be furnished with a plurality of earth pressure cells (7) at central pile beam (2) and water bag (4) upper surface; Be filled with embankment fill material (9) in the coffin that a plurality of earth pressure cells (7) four armorplate glasses in top (5) surround, the end face of embankment fill material (9) is furnished with displacement meter (10).
2. geosynthetic reinforced pile supported embankments on soft soil according to claim 1 plane soil arching effect experimental rig, it is characterized in that: earth pressure cell (7) connects the readout instrument that is positioned at base (1) outside.
3. geosynthetic reinforced pile supported embankments on soft soil according to claim 1 plane soil arching effect experimental rig, it is characterized in that: described aluminum alloy bar is parallel with central pile beam (2).
4. geosynthetic reinforced pile supported embankments on soft soil according to claim 1 plane soil arching effect experimental rig is characterized in that: be provided with horizontal reinforcing body (8) between earth pressure cell (7) and the embankment fill material (9); This horizontal reinforcing body (8) is fixed on the skirt piles beam (3).
5. geosynthetic reinforced pile supported embankments on soft soil according to claim 1 plane soil arching effect experimental rig, it is characterized in that: described embankment fill material (9) adopts the funnel placement in layers, whenever complete one deck with the spirit level leveling and use the pressing plate densification, then repave and fill out lower one deck embankment fill material, until predetermined altitude.
6. geosynthetic reinforced pile supported embankments on soft soil according to claim 1 plane soil arching effect experimental rig, it is characterized in that: after the end face that water bag (4) is filled with water to the end face of its upper surface and central pile beam (2) and skirt piles beam (3) flushes, arrange aluminum alloy bar and earth pressure cell (7) at water bag (4) upper surface again; And then filling embankment fill material (9).
7. geosynthetic reinforced pile supported embankments on soft soil according to claim 6 plane soil arching effect experimental rig, it is characterized in that: during test, the water in the water bag (4) is outwards emitted one by one, each two water bags (4) are emitted the water of equal volume with identical speed; Each earth pressure cell of rear measurement (7) reading and Embankment Subsidence discharge water at every turn.
8. geosynthetic reinforced pile supported embankments on soft soil according to claim 1 plane soil arching effect experimental rig, it is characterized in that: base (1), skirt piles beam (3) and central pile beam (2) all adopt brick forming, and connect into an integral body.
9. geosynthetic reinforced pile supported embankments on soft soil according to claim 1 plane soil arching effect experimental rig, it is characterized in that: water bag (4) adopts rubber bag tank to be made.
CN2013102832455A 2013-07-05 2013-07-05 Pile type reinforced embankment plane soil arch effect testing device Pending CN103352482A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105353105A (en) * 2015-11-26 2016-02-24 河海大学 Development testing device for plane soil arch effect and multi-layer reinforcement film-drawing effect in pile-supported type road embankment
CN105372408A (en) * 2015-11-18 2016-03-02 浙江省交通规划设计研究院 Full scale pile-supported type reinforced embankment three dimensional soil arching effect simulation test device
CN108363863A (en) * 2018-02-09 2018-08-03 中国十七冶集团有限公司 Piled Embankments consolidation settlement semi-analytical calculation method
CN108894258A (en) * 2018-04-04 2018-11-27 中南林业科技大学 A kind of test method of multi-column pier foundation bearing ratio in piles and soils
CN112697598A (en) * 2020-12-07 2021-04-23 西南交通大学 Pile net railway roadbed plane strain test device and method for simulating foundation expansion and shrinkage
CN115030241A (en) * 2022-07-11 2022-09-09 东南大学 Pile-supported type simulation device for medium-strength rainwater and high water level in embankment model groove

Citations (3)

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Publication number Priority date Publication date Assignee Title
EP0874214B1 (en) * 1997-04-24 2003-07-23 Bidim Geosynthetics S.A. Procedure for detecting ground subsidence under a civil engineering work
CN1975807A (en) * 2006-12-14 2007-06-06 浙江大学 Upper arch effect demonstrating instrument
CN201297175Y (en) * 2008-11-11 2009-08-26 西南交通大学 Soil pressure balancing-type shield construction process simulating tester

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0874214B1 (en) * 1997-04-24 2003-07-23 Bidim Geosynthetics S.A. Procedure for detecting ground subsidence under a civil engineering work
CN1975807A (en) * 2006-12-14 2007-06-06 浙江大学 Upper arch effect demonstrating instrument
CN201297175Y (en) * 2008-11-11 2009-08-26 西南交通大学 Soil pressure balancing-type shield construction process simulating tester

Non-Patent Citations (1)

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Title
曹卫平等: "桩承式加筋路堤土拱效应试验研究", 《岩土工程学报》 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105372408A (en) * 2015-11-18 2016-03-02 浙江省交通规划设计研究院 Full scale pile-supported type reinforced embankment three dimensional soil arching effect simulation test device
CN105353105A (en) * 2015-11-26 2016-02-24 河海大学 Development testing device for plane soil arch effect and multi-layer reinforcement film-drawing effect in pile-supported type road embankment
CN108363863A (en) * 2018-02-09 2018-08-03 中国十七冶集团有限公司 Piled Embankments consolidation settlement semi-analytical calculation method
CN108894258A (en) * 2018-04-04 2018-11-27 中南林业科技大学 A kind of test method of multi-column pier foundation bearing ratio in piles and soils
CN112697598A (en) * 2020-12-07 2021-04-23 西南交通大学 Pile net railway roadbed plane strain test device and method for simulating foundation expansion and shrinkage
CN115030241A (en) * 2022-07-11 2022-09-09 东南大学 Pile-supported type simulation device for medium-strength rainwater and high water level in embankment model groove
CN115030241B (en) * 2022-07-11 2024-03-12 东南大学 Strong rainwater and high water level action simulation device in pile-bearing type embankment model groove

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Application publication date: 20131016