CN102411042A - Piping test device of seepage corrosion stress coupling - Google Patents
Piping test device of seepage corrosion stress coupling Download PDFInfo
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- CN102411042A CN102411042A CN2011102421270A CN201110242127A CN102411042A CN 102411042 A CN102411042 A CN 102411042A CN 2011102421270 A CN2011102421270 A CN 2011102421270A CN 201110242127 A CN201110242127 A CN 201110242127A CN 102411042 A CN102411042 A CN 102411042A
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- 230000008878 coupling Effects 0.000 title claims abstract description 22
- 238000010168 coupling process Methods 0.000 title claims abstract description 22
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 22
- 238000012360 testing method Methods 0.000 title claims abstract description 20
- 238000005260 corrosion Methods 0.000 title abstract 3
- 230000007797 corrosion Effects 0.000 title abstract 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 16
- 239000010959 steel Substances 0.000 claims abstract description 16
- 230000003628 erosive effect Effects 0.000 claims description 14
- 239000011148 porous material Substances 0.000 claims description 13
- 230000000630 rising effect Effects 0.000 claims description 12
- 238000006073 displacement reaction Methods 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 7
- 239000012466 permeate Substances 0.000 claims description 6
- 239000002689 soil Substances 0.000 abstract description 19
- 238000000034 method Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 6
- 238000011161 development Methods 0.000 abstract description 4
- 238000011160 research Methods 0.000 abstract description 4
- 230000010454 developmental mechanism Effects 0.000 abstract 1
- 230000008595 infiltration Effects 0.000 description 6
- 238000001764 infiltration Methods 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 4
- 238000007596 consolidation process Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000013508 migration Methods 0.000 description 3
- 230000005012 migration Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000001808 coupling effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011085 pressure filtration Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Abstract
The invention relates to a piping test device of seepage corrosion stress coupling, wherein a leakage groove is arranged in the base, a pressure chamber is installed on the upper part of the base and a top cover is installed on the upper part of the pressure chamber; one end of the water outlet tube is connected with the bottom outlet of the base and the other end is extended into a measuring pot; a sample is installed in the pressure chamber on the base; a porous steel plate is installed between the sample and the base; a shrinkable tube is closely wrapped on the outside of the sample and a cover cap is arranged at the top part of the sample; a scree filter layer is filled in the cover cap; one end of the axial pressurizing rod is penetrated through the top cover to contact with the cover cap and the other end is connected with an axial pressurizer; a photoelectric sensor is installed on the body of the water outlet tube; a resistance strain gage is installed on the shrinkable tube. The invention researches a piping development process of the soil body under a complex stress state from the seepage corrosion stress coupling aspect, provides a new aspect for the comprehensive understanding of the soil body piping developmental mechanism and also provides an important theoretical basis and a technical support for the prediction and the effective treatment of the dam piping dangerous case.
Description
Technical field
The present invention relates to a kind of seepage flow-erosion-stress coupling piping test unit, the particularly a kind of test unit that can study the seepage flow-erosion-stress coupling mechanism of original state soil body piping evolution.
Background technology
According to statistics, the nineties in 20th century, China is 1343.1 hundred million yuan of economic loss of flood every year on average, 1998 nearly 2550.9 hundred million yuan especially, flood causes numerous dykes and dams occurrence of large-area seepage failures, wherein piping is a kind of crucial seepage failure form.Therefore; Carry out the correlative study of dike piping mechanism and evolution thereof forecast; Avoid or effectively control failure by piping; Be the application foundation Journal of Sex Research problem that Geotechnical Engineering and Hydraulic and Hydro-Power Engineering field need to be resolved hurrily, the sustainable development that ensures littoral resident's security of the lives and property and urban economy is had crucial meaning.
Early-stage Study shows; Piping relates to heterogeneous many coupling phenomenons of numerous complicated mechanical behaviors such as pore water seepage flow, movable fine grained erosion migration, porous medium distortion: pore water seepage scour eroded soil skeleton produces movable fine grained; Movable fine grained is followed the migration of pore water seepage flow and is run off; Soil particle is arranged again, is deposited, and causes soil body microscopical structure and mechanical characteristic to change, like inhomogeneous variation of porosity, perviousness, rigidity and shearing strength etc.The inhomogeneous variation of soil body penetration property causes the pore water pressure of pore water medium to change.And then the effective stress that makes soil skeleton bear changes thereupon; Cause the variation of inside soil body stress state; Stress state ground changes the pore water pressure that influences the pore water medium conversely once more and distributes; And to the erosion action of soil skeleton ground, i.e. the evolution of piping is exactly the process of seepage flow-erosion-stress coupling.
But existing piping test unit has been ignored this seepage flow-erosion-stress coupling effect in the piping evolution; The device that has is not considered fine grained the run off soil body how much (porosity), the waterpower (perviousness) cause, the variation of mechanical characteristic (shearing strength etc.), and the device that has then can't be considered the influence of the residing stress state of the soil body to piping.Therefore, achievement in research can't comprehensively and objectively disclose the seepage flow eroding stress coupling mechanism of piping, has had a strong impact on the accurate forecast of dike piping dangerous situation.
Summary of the invention
The present invention is directed to above-mentioned described deficiency a kind of seepage flow eroding stress coupling piping test unit is provided.
The following technical scheme of the present invention:
The invention provides a kind of seepage flow eroding stress coupling piping test unit, comprise base, stephanoporate steel plate, pressure chamber, sample, heat-shrink tube, block, cobble filtering layer, top cover, axial pressure bar, axial pressure device, rising pipe, photoelectric sensor, resistance strain gage, measuring cup; Arrange bakie in the described base, the pressure chamber is arranged on base top, and top cover is arranged on the top of pressure chamber; One end of rising pipe is connected with the base outlet at bottom, the other end extends into measuring cup; Sample is arranged in the pressure chamber and is built on the base, arranges stephanoporate steel plate between sample and the base, and heat-shrink tube, top layout block are closely wrapped up in the outside of sample, fill the cobble filtering layer in the block; One end of axial pressure bar passes top cover and is connected with the axial pressure device with block contact, the other end; Photoelectric sensor is arranged on the pipe shaft of rising pipe; Resistance strain gage is arranged on the heat-shrink tube.
Seepage flow eroding stress coupling piping test unit of the present invention, the through-hole aperture of described stephanoporate steel plate is 0.075mm-5mm.
Seepage flow eroding stress coupling piping test unit of the present invention also comprises the permeate pressurization device, confined pressure pressurizer, displacement transducer, strain data collector, pore water pressure sensor; Described permeate pressurization device is connected with block through pipeline; The confined pressure pressurizer is connected with the base bottom through pipeline; And be communicated with the pressure chamber; Displacement transducer is arranged in the top of axial pressure bar, and the strain data collector is connected with resistance strain gage, and pore water pressure sensor is connected through the stephanoporate steel plate of pipeline with the base top.
Beneficial effect
Seepage flow-erosion-stress coupling piping test unit can be considered the influence of pore water seepage flow-heterogeneous many coupling effects such as fine grained erosion migration-soil deformation to soil body piping evolution; The soil body that can tracking and monitoring be in the three dimension stress state; Under seepage effect, the dynamic changing process of wherein movable fine particle content, porosity, perviousness, settling amount, rigidity, Shear Strength Index.The piping evolution of the present invention's soil body under seepage flow-erosion-stress coupling angle research complex stress condition; For full appreciation soil body piping development mechanism provides new angle, will with effectively administering important theory foundation and technical support be provided for the prediction of dike piping dangerous situation simultaneously.
Description of drawings
Fig. 1 is a structural representation of the present invention
1 is base among the figure, the 11st, and stephanoporate steel plate, the 2nd, pressure chamber, the 3rd, sample, the 4th, heat-shrink tube; The 5th, block, the 6th, cobble filtering layer, the 7th, top cover, the 8th, axial pressure bar, the 9th, axial pressure device; The 10th, rising pipe, the 12nd, photoelectric sensor, the 13rd, resistance strain gage, the 14th, measuring cup.
Embodiment
Below in conjunction with accompanying drawing to further explain of the present invention:
As shown in Figure 1: a kind of seepage flow eroding stress coupling piping test unit comprises base 1, stephanoporate steel plate 11, pressure chamber 2, sample 3; Heat-shrink tube 4, block 5, cobble filtering layer 6, top cover 7, axial pressure bar 8; Axial pressure device 9, rising pipe 10, photoelectric sensor 12, resistance strain gage 13, measuring cup 14.
Arrange bakie in the base 1, pressure chamber 2 is arranged on base 1 top, and top cover 7 is arranged on the top of pressure chamber 2; One end of rising pipe 10 is connected with base 1 outlet at bottom, the other end extends into measuring cup 14; Sample 3 is arranged in pressure chamber 2 and is built on the base 1, arranges between sample 3 and the base 1 that stephanoporate steel plate 11, the outside of sample 3 closely wrap up heat-shrink tube 4, top layout block 5, fill cobble filtering layer 6 in the block 5; One end of axial pressure bar 8 passes top cover 7 and is connected with axial pressure device 9 with block 5 contacts, the other end; Photoelectric sensor 12 is arranged on the pipe shaft of rising pipe 10; Resistance strain gage 13 is arranged on the heat-shrink tube 4.
The through-hole aperture of stephanoporate steel plate 11 is 0.075mm-5mm.The general through hole of 0.075mm diameter, 2mm diameter, 5 mm diameters that adopts experimentizes.
The permeate pressurization device is connected with block 5 through pipeline; The confined pressure pressurizer is connected with base (1) bottom through pipeline; And be communicated with pressure chamber (2); Displacement transducer is arranged in the top of axial pressure bar 8, and the strain data collector is connected with resistance strain gage 13, and pore water pressure sensor is connected with the stephanoporate steel plate 11 of base 1 top through pipeline.
The method of testing of seepage flow eroding stress coupling piping test unit, step is following:
(1) preparation, installation sample.At first, according to dry density and water cut requirement, utilize special split cavity to prepare sample, the sample outside surface adopts heat-shrink tube closely to wrap up.Secondly, (stephanoporate steel plate is mainly used in the crude fines, and this test supposes that movable fine grain particle diameter is less than 2mm on base, to place the stephanoporate steel plate of aperture 2mm; Promptly in the test; Only particle diameter can flow out sample less than the fine grained of 2mm), sample is fixed on the instrument base tighten the screws.At last, in sample top cover upper cap, attention will remain sample and be in vertical state, and unlikely generation eccentric compression when guaranteeing that the later stage is born axle pressure influences test result.
(2) adhering resistance strain sheets.In order to monitor the hoop strain of sample, so the bulk strain of the sample in definite piping evolution, on same circumference, 4 resistance strain gages evenly being sticked on the heat-shrink tube near the sample centre position, each foil gauge angle differs 90 degree.In the process of the test, collect the strain value of 4 resistance strain gages, replace the hoop strain value of number mean value as sample.
(3) apply ambient pressure.At first, confined pressure chamber water-filling.Sealing is noted in the setting pressure chamber.Open the air release at top, pressure chamber, begin slowly to add water, treat that water all is full of the pressure chamber and when air release overflows, tightens air release, closes water intaking valve to the pressure chamber.Secondly, installation shaft is to pressure rod, the adjustment (adjusting) lever balance.Installation shaft guarantees that to pressure rod the axial pressure bar just in time places in the groove at block top, and fastening nut guarantees closely contact, and displacement transducer is positioned over nut top, keeps closely contact, and the adjustment hammer makes lever be in the equilibrium position.At last, open the confined pressure operation valve and begin to apply ambient pressure, open draining valve simultaneously, sample begins consolidation process, and current get into measuring cup through rising pipe.
(4) apply axle pressure.According to the discharging consolidation process of sample, start the axial pressure device, apply axle pressure.Add counterweight, lever becomes imbalance by balance, and the spin balancing regulating device becomes balance up to lever by imbalance again.In the loading procedure, adopt classification to apply, monitor the settling amount of sample in consolidation process closely through displacement transducer, apply first class pressure after, when the sample settling amount no longer changes, begin to apply next stage pressure, until the xial feed that is loaded into requirement.After treating the sample settlement stability, keep confined pressure and axle pressure constant, in order to simulate the residing three dimension stress state of the original state soil body in the actual engineering.
(5) apply seepage pressure.Open the seepage pressure operation valve, start the permeate pressurization device, the beginning classification applies seepage pressure, and infiltration water stream gets into sample through water inlet pipe, and through rising pipe, gets into measuring cup.In this process, monitor following data closely:
(a)Sample flow～infiltration gradient relation;
(b)The turbidity of photoelectric sensor monitoring～infiltration gradient relation, the critical infiltration gradient when beginning to start migration in order to pass judgment on movable fine grained;
(c)Stream of fine particles vector～time relationship;
(d)Sample sedimentation～time relationship, sample hoop strain～time relationship, sample sedimentation～infiltration gradient relation, sample hoop strain～infiltration gradient relation.When treating that sample takes place to destroy, stop experiment.
Arrangement experiment achievement; Set up the seepage flow-erosion-stress coupling constitutive equation that discloses piping evolution characteristics; And then make up the coupling piping mathematical model of forecasting soil body piping incidence and development process, for the piping dangerous situation of forecasting in advance and administer in the actual engineering provides effective technical support.
Claims (3)
1. a seepage flow eroding stress coupling piping test unit is characterized in that: comprise base (1), stephanoporate steel plate (11), pressure chamber (2); Sample (3), heat-shrink tube (4), block (5), cobble filtering layer (6); Top cover (7), axial pressure bar (8), axial pressure device (9), rising pipe (10); Photoelectric sensor (12), resistance strain gage (13), measuring cup (14); Arrange bakie in the described base (1), pressure chamber (2) is arranged on base (1) top, and top cover (7) is arranged on the top of pressure chamber (2); One end of rising pipe (10) is connected with base (1) outlet at bottom, the other end extends into measuring cup (14); Sample (3) is arranged in pressure chamber (2) and is built on the base (1); Arrange stephanoporate steel plate (11) between sample (3) and the base (1); Heat-shrink tube (4), top layout block (5) are closely wrapped up in the outside of sample (3), fill cobble filtering layer (6) in the block (5); One end of axial pressure bar (8) passes top cover (7) and is connected with axial pressure device (9) with block (5) contact, the other end; Photoelectric sensor (12) is arranged on the pipe shaft of rising pipe (10); Resistance strain gage (13) is arranged on the heat-shrink tube (4).
2. seepage flow eroding stress coupling piping test unit according to claim 1, it is characterized in that: the through-hole aperture of described stephanoporate steel plate (11) is 0.075mm-5mm.
3. seepage flow eroding stress coupling piping test unit according to claim 1 is characterized in that: also comprise the permeate pressurization device, confined pressure pressurizer, displacement transducer, strain data collector, pore water pressure sensor; Described permeate pressurization device is connected with block (5) through pipeline; The confined pressure pressurizer is connected with base (1) bottom through pipeline; And be communicated with pressure chamber (2); Displacement transducer is arranged in the top of axial pressure bar (8), and the strain data collector is connected with resistance strain gage (13), and pore water pressure sensor is connected through the stephanoporate steel plate (11) of pipeline with base (1) top.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110242127.0A CN102411042B (en) | 2011-08-23 | 2011-08-23 | Piping test device of seepage corrosion stress coupling |
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| CN201110242127.0A CN102411042B (en) | 2011-08-23 | 2011-08-23 | Piping test device of seepage corrosion stress coupling |
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| CN102411042A true CN102411042A (en) | 2012-04-11 |
| CN102411042B CN102411042B (en) | 2014-05-07 |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102608263A (en) * | 2012-02-23 | 2012-07-25 | 徐德金 | Test method for researching fracture water bursting based on coupling of seepage field and stress field |
| CN103018424A (en) * | 2012-12-11 | 2013-04-03 | 重庆交通大学 | Indoor simultaneous determination device and method of piping critical hydraulic gradient and particle wastage rate |
| CN103293286A (en) * | 2013-06-24 | 2013-09-11 | 重庆交通大学 | Testing device for testing soil phase transformation-constitutive coupling law, and method |
| CN104819926A (en) * | 2015-05-20 | 2015-08-05 | 河海大学 | Multi-field coupling penetration test device and method for cracked rock |
| CN104833579A (en) * | 2015-04-24 | 2015-08-12 | 河海大学 | Test device and test method for testing strength change of soil body after occurrence of seepage deformation of dykes and dams |
| CN105372140A (en) * | 2015-11-03 | 2016-03-02 | 西安科技大学 | Device and method for evaluating anti-erosion capacity of soil |
| CN107167411A (en) * | 2017-06-12 | 2017-09-15 | 河海大学 | Piping infiltration visible model testing device and test method in a kind of seepage liquefaction |
| CN107192535A (en) * | 2017-07-14 | 2017-09-22 | 中冶华天工程技术有限公司 | The experimental rig of soil body piping Erosion Law under a kind of research complex stress condition |
| CN107957388A (en) * | 2017-10-27 | 2018-04-24 | 东南大学 | Original state saturated soil and the seepage flow of conditioned soil-creep combined test device and method |
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| CN108918384A (en) * | 2018-07-18 | 2018-11-30 | 重庆大学 | Earth pillar seepage inflow erosion experimental provision and soil-water separate experimental method under a kind of rain infiltration |
| CN110208123A (en) * | 2019-05-14 | 2019-09-06 | 浙江大学 | A kind of laboratory testing rig measuring soil sample seepage inflow erosion characteristic under pressure in situ |
| CN111398045A (en) * | 2020-04-30 | 2020-07-10 | 华南农业大学 | Internal pressure test device and test method for measuring annular tensile property of fiber reinforced composite material pipe for structural engineering |
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| CN112504892A (en) * | 2020-11-19 | 2021-03-16 | 山东大学 | Contact surface particle erosion test device and method under normal pressure action |
| CN115561135A (en) * | 2021-12-01 | 2023-01-03 | 上海勘测设计研究院有限公司 | Flexible wall vertical permeameter |
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| CN102608263B (en) * | 2012-02-23 | 2014-11-19 | 徐德金 | Test method for researching fracture water bursting based on coupling of seepage field and stress field |
| CN102608263A (en) * | 2012-02-23 | 2012-07-25 | 徐德金 | Test method for researching fracture water bursting based on coupling of seepage field and stress field |
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| CN111649925B (en) * | 2020-06-01 | 2022-04-19 | 河海大学 | Pipeline deformation distributed monitoring device and monitoring method based on transparent soil |
| CN112504892A (en) * | 2020-11-19 | 2021-03-16 | 山东大学 | Contact surface particle erosion test device and method under normal pressure action |
| CN115561135A (en) * | 2021-12-01 | 2023-01-03 | 上海勘测设计研究院有限公司 | Flexible wall vertical permeameter |
| CN115561135B (en) * | 2021-12-01 | 2024-01-30 | 上海勘测设计研究院有限公司 | Flexible wall vertical permeameter |
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