CN104831763B - A kind of pile body anti_freeze uplift performance test experimental apparatus and its experimental method - Google Patents
A kind of pile body anti_freeze uplift performance test experimental apparatus and its experimental method Download PDFInfo
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- CN104831763B CN104831763B CN201510296757.4A CN201510296757A CN104831763B CN 104831763 B CN104831763 B CN 104831763B CN 201510296757 A CN201510296757 A CN 201510296757A CN 104831763 B CN104831763 B CN 104831763B
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Abstract
The invention discloses a kind of pile body anti_freeze uplift performance test experimental apparatus and its experimental method, it includes test specimen tube, cryostat dish, fixed support and base.In order to not limit pile body lifting by frost, cryostat dish are provided with center hole；Fixed support is assembled by stainless steel ring flat-plate, stainless steel connecting rod and stainless steel plectane；Base is provided with annular freezing liquid circulation pipe and provides temperature for sample bottom, the densely covered small sircle hole of porous disc thereon.Test specimen tube is placed in fixed support by this method first, and mounting seat, then experiment pile body and earth material are inserted in test specimen tube by test requirements document, place at the top of cryostat dish to sample, connect cryostat dish, freezing liquid outlet, the import to external refrigerating plant of base, refrigerating plant and harvester are opened, starts experiment.The present invention can test the lifting by frost performances such as permafrost region pile foundation lifting by frost displacement, lifting by frost power indoors, and experimental factor is controllable, easy to operate, greatly reduces the workload of field test, further enriches frozen soil experiment technological means.
Description
Technical field
The present invention relates to a kind of pile body anti_freeze uplift performance test experimental apparatus and its experimental method, the indoor geotechnological low temperature examination of category
Test technical field.
Background technology
The area of ever-frozen ground accounts for the 22.3% of China's gross area, and frost zone and short-term frozen soil are then throughout more than half
China.In seasonal frozen soil region, pile foundation is easy to produce lifting by frost phenomenon, so as to cause the uneven change of superstructure generation and shadow
Ring normal using even destruction.Therefore, in order to develop permafrost region, it is ensured that the stabilization of permafrost region superstructure, research frozen soil and stake
Interaction between base, the lifting by frost phenomenon of reduction pile foundation has important meaning.
For a long time, the lifting by frost research of pile foundation has two ways：One is to carry out field test；Two be soft using finite element
Part carries out simulation calculation.Field test expends huge manpower, financial resources, and elapsed cycles are long, and uncontrollable factor is more, poor repeatability,
It is unfavorable for studying each factor respectively.Finite element software simulation calculation is influenceed larger by boundary condition, mesh generation, different
Software result of calculation it is different, the correctness of result is under suspicion, Practical Project can not be instructed.These are resulted in pile foundation
The research of plinth anti_freeze uplift has significant limitation.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of convenience simple to operate, efficient, it is easy to the pile body of control freeze proof
Performance test experimental apparatus and its experimental method are pulled out, it can simulate frozen ground regions pile foundation lifting by frost phenomenon completely, subtract significantly
The workload of few field test, enriches frozen soil experiment technological means.
In order to solve the above technical problems, this Sample devices is adopted the technical scheme that：A kind of pile body anti_freeze uplift performance is surveyed
Experimental provision is tried, its key technology is：It includes test specimen tube, the cryostat dish above sample inside test specimen tube, for solid
Determine the fixed support of test specimen tube and the base below sample；
The test specimen tube include lucite cylinder body, with machine glass infuser the lucite ring flat-plate in face, positioned at machine glass
The plexiglass base plate of glass stack shell top and bottom and the stainless steel larynx band for playing reinforcement effect being installed on lucite stack shell outer wall
Hoop, the lucite stack shell bottom is provided with water supplement port and exhaust outlet；
The cryostat dish include stainless steel and justify box, the center hole in the middle of stainless steel circle box, are arranged at stainless steel circle
Freezing liquid inlet and outlet above box；
The base includes being sequentially arranged in pile body bracket below sample, feeds porous disc and ring to simulated groundwater
Shape freezing liquid circulation pipe, the freezing liquid import of the annular freezing liquid circulation pipe and freezing liquid outlet are extended to outside test specimen tube；
The fixed support is including the stainless steel ring flat-plate above lucite ring flat-plate, below plexiglass base plate
Stainless steel plectane and stainless steel connecting rod for connecting stainless steel ring flat-plate and stainless steel plectane.
The stainless steel larynx band hoop gathers on the outside of lucite stack shell, prevents lucite stack shell from deforming.
The center hole diameter is more than sample top diameter.
The annular freezing liquid circulation pipe is annular copper pipe.
It is covered with permeable small sircle hole on the porous disc.
The pile body bracket is lucite plectane.
The pile body bracket diameter is slightly larger than pile body base diameter, to prevent the soil body from entering pile body bottom, to reach only
Purpose from test pile side to body frost heaving affecting laws.
Experimental method of the present invention is：Test specimen tube is placed in fixed support first, and mounting seat is to test specimen tube bottom, so
Sample is placed on bracket afterwards, and fills soil compaction, then cryostat dish are placed at the top of sample, is connected respectively in cryostat dish
Freezing liquid inlet and outlet in freezing liquid inlet and outlet and base connects water supplement port to external horse to external refrigerating plant
Family name's water bottle, and displacement transducer is placed at the top of experiment pile body from cryostat dish center hole, open refrigerating plant and collection
Device, starts experiment.
The freezing process of the present invention is unidirectional cooling pattern from top to bottom.Before freezing process starts, it is permanent that sample need to carry out 12h
Temperature processing, when native body temperature is consistent, then starts the water supplement port that cools and open.
It is using the beneficial effect produced by above-mentioned technical proposal：
1st, the present invention is provided with test specimen tube, cryostat dish, fixed support and base, and sample is placed on base, overall knot
Structure is fairly simple, simple to operate, efficiently convenient, and using effect is good, effectively simulates the lifting by frost phenomenon of pile foundation.
2nd, due to can be carried out using the device in laboratory, changed using external refrigerating plant precise control of temperature,
The elapsed time of cyclic test is substantially reduced, experiment work efficiency is improved；Soil sample during each experiment is also ensure that simultaneously
With identical initial temperature, the test temperature of each sample can be accurately controlled, the comparative of test data is effectively increased.
3rd, because external refrigerating plant is connected with base and cryostat dish to provide the freezing liquid with steady temperature respectively, from
And reach and unidirectional cooling, the purpose of the live soil body Unidirectional Freezing of simulation are carried out to the soil body.
4th, by setting water supplement port and exhaust outlet, connection geneva bottle carries out the underground under moisturizing, simulation simulated field soil body
Water is fed, so that with being contrasted without the recharge of ground water.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the schematic diagram of cryostat dish；
Fig. 3 is the schematic diagram of porous disc；
Fig. 4 is the schematic diagram of annular freezing liquid circulation pipe；
Wherein, 1, test specimen tube, 1-1, lucite stack shell, 1-2, lucite ring flat-plate, 1-3, stainless steel larynx band hoop, have 1-4
Machine glass film plates, 1-5, water supplement port, 1-6, exhaust outlet；2nd, cryostat dish, 2-1, stainless steel circle box, 2-2, center hole are 2-3, cold
Freeze liquid import, 2-4, freezing liquid outlet；3rd, fixed support, 3-1, stainless steel ring flat-plate, 3-2, stainless steel connecting rod, 3-3 stainless steels
Plectane；4th, base, 4-1, pile body bracket, 4-2, porous disc, 4-3, annular freezing liquid circulation pipe, 4-4, freezing liquid import, 4-5,
Freezing liquid is exported, and 5, sample；6th, earth material.
Embodiment
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.
Referring to accompanying drawing 1- accompanying drawings 4, the present embodiment includes test specimen tube 1, the cryostat dish located at the top of 1 inside sample of test specimen tube 5
2nd, for fixing the fixed support 3 and the base 4 positioned at the lower section of sample 5 of test specimen tube 1；
The test specimen tube 1 includes lucite cylinder body 1-1, the lucite ring flat-plate above lucite stack shell 1-1
1-2, the plexiglass base plate 1-4 positioned at machine glass stack shell 1-1 top and bottom and it is installed on lucite stack shell 1-1 outer walls
The stainless steel larynx band hoop 1-3 of reinforcement effect is played, the lucite stack shell 1-1 bottoms are provided with water supplement port 1-5 and exhaust outlet 1-6；Institute
State stainless steel larynx band hoop 1-3 to gather on the outside of lucite stack shell 1-1, prevent lucite stack shell from deforming.
The cryostat dish 2 include stainless steel and justify box 2-1, the center hole 2-2 in the middle of stainless steel circle box 2-1, set
Justify the freezing liquid import 2-3 and outlet 2-4 above box 2-1 in stainless steel；The center hole 2-2 diameters are more than the top of sample 5
Diameter, prevents the displacement on pile body from producing influence.
The base 4 is including being sequentially arranged in the pile body bracket 4-1 of the lower section of sample 5, to the permeable of simulated groundwater supply
Plate 4-2 and annular freezing liquid circulation pipe 4-3, the annular freezing liquid circulation pipe 4-3 freezing liquid import 4-4 and freezing liquid go out
Mouth 4-5 is extended to outside test specimen tube 1；The annular freezing liquid circulation pipe 4-3 is annular copper pipe.Wherein pile body bracket 4-1 is to have
Machine glass plate, diameter is slightly larger than the base diameter of sample 5, to prevent the soil body from entering the bottom of sample 5, to reach only test sample 5
It is covered with permeable small sircle hole on the purpose of lateral body frost heaving affecting laws, porous disc 4-2, to simulated groundwater supply.
The fixed support 3 is including the stainless steel ring flat-plate 3-1 above lucite ring flat-plate 1-2, positioned at lucite
Stainless steel plectane 3-3 below bottom plate 1-4 and the stainless steel company for connecting stainless steel ring flat-plate 3-1 and stainless steel plectane 3-3
Extension bar 3-2.The present invention can test the lifting by frost performances such as permafrost region pile foundation lifting by frost displacement, lifting by frost power indoors.
Illustrate the experimental method of the present invention below by embodiment.
Embodiment 1
The lifting by frost displacement performance test implementation process of pile body is not under supplying water condition for closing：
Base 4 is attached into the bottom of test specimen tube 1 to be placed in fixed support 3, then by sample 5（Test pile body）It is placed in
On pile body bracket 4-1, and soil compaction, during which layered arrangement temperature sensor, then cryostat dish 2 are placed are filled by test requirements document
At the top of sample 5, external refrigerating plant is connected freezing liquid import 2-3 and outlet 2-4 in cryostat dish 2 to reach control respectively
The effect of the head temperature of sample 5, the freezing liquid import 4-4 and freezing liquid external refrigerating plant distinguished in connect base 4 is exported
4-5 simultaneously closes off water supplement port 1-5 and exhaust outlet 1-6 to reach the effect of the bottom temp of Control Assay 5, and by displacement transducer
The top of sample 5 is placed on from cryostat dish center hole 2-2, refrigerating plant and harvester is opened, starts experiment.It is to be tested to terminate
Afterwards, cryostat dish 2 are taken away to carry out tearing sample open, experiment is finally completed.Wherein, the refrigerating plant is that can provide the freezing of steady temperature
The cryogenic thermostat cryostat of liquid, the harvester is DT80 data acquisition devices, can the data such as collecting temperature, displacement.The system
Device for cooling and harvester use refrigerating plant and harvester be the same as Example 1 in existing product, embodiment 2.
Embodiment 2
The lifting by frost power performance test implementation process of pile body is under open supplying water condition：
Base 4 is attached into the bottom of test specimen tube 1 to be placed in fixed support 3, sample 5 is then placed in pile body bracket 4-1
On, and fill soil compaction, during which layered arrangement temperature sensor, pressure sensor, then cryostat dish 2 are placed by test requirements document
At the top of sample 5, external refrigerating plant is connected freezing liquid import 2-3 and outlet 2-4 in cryostat dish 2 to reach control respectively
The effect of the head temperature of sample 5, the freezing liquid import 4-4 and freezing liquid external refrigerating plant distinguished in connect base 4 is exported
Water supplement port 1-5 is attached by 4-5 with reaching the effect of Control Assay bottom temp with geneva bottle, and by pressure sensor certainly
Cryostat dish center hole is placed at the top of experiment pile body, is opened water supplement port 1-5 and exhaust outlet 1-6, is treated that liquid level and porous disc 4-2 are neat
Exhaust outlet 1-6 is usually closed, and pressure sensor is placed at the top of experiment pile body from cryostat dish center hole 2-2, while
Pressure sensor top surface places high-strength steel sheet, and welds together with fixed support 3, prevents that putting pile body is subjected to displacement.Open system
Device for cooling and harvester, start experiment.After end to be tested, take cryostat dish 2 away and carry out tearing sample open, finally complete experiment.
Claims (8)
1. a kind of pile body anti_freeze uplift performance test experimental apparatus, it is characterised in that：It includes test specimen tube（1）, located at test specimen tube（1）
Internal sample（5）The cryostat dish of top（2）, for fixing test specimen tube（1）Fixed support（3）And positioned at sample（5）Under
The base of side（4）；
The test specimen tube（1）Including lucite cylinder body（1-1）, positioned at lucite stack shell（1-1）Lucite ring above
Plate（1-2）, positioned at lucite stack shell（1-1）Following plexiglass base plate（1-4）And it is installed on lucite stack shell（1-
1）The stainless steel larynx band hoop for playing reinforcement effect on outer wall（1-3）, the lucite stack shell（1-1）Bottom is provided with water supplement port（1-
5）And exhaust outlet（1-6）；
The cryostat dish（2）Justify box including stainless steel（2-1）, positioned at stainless steel justify box（2-1）Middle center hole（2-2）、
It is arranged at stainless steel circle box（2-1）Freezing liquid import above（2-3）And outlet（2-4）；
The base（4）Including being sequentially arranged in sample（5）The pile body bracket of lower section（4-1）, to simulated groundwater feed it is saturating
Water plate（4-2）And annular freezing liquid circulation pipe（4-3）, the annular freezing liquid circulation pipe（4-3）Freezing liquid import（4-4）
With freezing liquid outlet（4-5）Extend to test specimen tube（1）It is outside；
The fixed support（3）Including positioned at lucite ring flat-plate（1-2）The stainless steel ring flat-plate of top（3-1）, positioned at organic glass
Glass bottom plate（1-4）The stainless steel plectane of lower section（3-3）And for connecting stainless steel ring flat-plate（3-1）With stainless steel plectane（3-3）
Stainless steel connecting rod（3-2）；
The annular freezing liquid circulation pipe（4-3）For annular copper pipe；
The porous disc（4-2）On be covered with permeable small sircle hole.
2. a kind of pile body anti_freeze uplift performance test experimental apparatus according to claim 1, it is characterised in that：The stainless steel
Larynx hoop（1-3）Gather in lucite stack shell（1-1）Outside.
3. a kind of pile body anti_freeze uplift performance test experimental apparatus according to claim 1, it is characterised in that：The center circle
Hole（2-2）Diameter is more than sample（5）Top diameter.
4. a kind of pile body anti_freeze uplift performance test experimental apparatus according to claim 1, it is characterised in that：The pile body support
Seat（4-1）For lucite plectane.
5. a kind of pile body anti_freeze uplift performance test experimental apparatus according to claim 4, it is characterised in that：The pile body support
Seat（4-1）Diameter is slightly larger than pile body base diameter.
6. the experimental method of the pile body anti_freeze uplift performance test experimental apparatus described in claim any one of 1-5, it is characterised in that：
First by test specimen tube（1）It is placed in fixed support（3）It is interior, and mounting seat（4）To test specimen tube（1）Bottom, then by sample（5）Put
In bracket（4-1）On, and fill earth material（6）Compacting, then by cryostat dish（2）It is placed on sample（5）Top, connects cryostat dish respectively
（2）On freezing liquid import（2-3）And outlet（2-4）And base（4）On freezing liquid import（4-4）And outlet（4-5）Extremely
External refrigerating plant, connects water supplement port（1-5）To external geneva water bottle, and by displacement transducer from cryostat dish center hole
（2-2）It is placed at the top of experiment pile body, opens refrigerating plant and harvester, starts experiment.
7. the experimental method of pile body anti_freeze uplift performance test experimental apparatus according to claim 6, it is characterised in that：The party
The freezing process of method is unidirectional cooling pattern from top to bottom.
8. the experimental method of pile body anti_freeze uplift performance test experimental apparatus according to claim 7, it is characterised in that：Freeze
Before process starts, sample need to carry out 12h constant temperature processing, when native body temperature is consistent, then start the water supplement port that cools and open（1-
5）.
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| CN201510296757.4A CN104831763B (en) | 2015-06-03 | 2015-06-03 | A kind of pile body anti_freeze uplift performance test experimental apparatus and its experimental method |
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| CN201510296757.4A CN104831763B (en) | 2015-06-03 | 2015-06-03 | A kind of pile body anti_freeze uplift performance test experimental apparatus and its experimental method |
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| CN104831763B true CN104831763B (en) | 2017-07-28 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106442035B (en) * | 2016-05-18 | 2023-08-01 | 中国能源建设集团甘肃省电力设计院有限公司 | Device and method for manufacturing direct shear test sample of concrete-frozen soil contact surface |
| CN108225651B (en) * | 2018-01-09 | 2023-07-04 | 石家庄铁道大学 | Test method and test device for testing tangential frost heaving force distribution of conical piles in frozen soil area |
| CN115876579A (en) * | 2022-08-25 | 2023-03-31 | 中国科学院西北生态环境资源研究院 | Creep test method for pile-frozen soil shear sample |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102108716B (en) * | 2011-03-25 | 2012-08-22 | 长春工程学院 | Instrument for determining freezing-pulling force of pile |
| CN102435717B (en) * | 2011-09-21 | 2014-06-25 | 南京林业大学 | Soil frost-heaving and thawing-settlement tester based on thermoelectric refrigeration control |
| CN102864793B (en) * | 2012-06-15 | 2014-10-01 | 中国科学院寒区旱区环境与工程研究所 | Test device for simulating permafrost region well heat insulation or heating |
| CN102926411A (en) * | 2012-10-24 | 2013-02-13 | 中国建筑第六工程局有限公司 | Pile side negative friction resistance test device in frozen earth areas and application method thereof |
| CZ2012803A3 (en) * | 2012-11-19 | 2013-08-07 | Ceské vysoké ucení technické - Fakulta elektrotechnická | Soil-freezing meter |
| CN103061361A (en) * | 2013-01-07 | 2013-04-24 | 中国建筑第六工程局有限公司 | Device for testing side wall adfreezing force of piles in frozen earth areas and application method thereof |
| CN204753655U (en) * | 2015-06-03 | 2015-11-11 | 石家庄铁道大学 | Freeze proof capability test experimental apparatus that pulls out of pile body |
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