CN102411042B - Piping test device of seepage corrosion stress coupling - Google Patents
Piping test device of seepage corrosion stress coupling Download PDFInfo
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- CN102411042B CN102411042B CN201110242127.0A CN201110242127A CN102411042B CN 102411042 B CN102411042 B CN 102411042B CN 201110242127 A CN201110242127 A CN 201110242127A CN 102411042 B CN102411042 B CN 102411042B
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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, particularly a kind of test unit that can study 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 very important seepage failure form.Therefore, carry out the correlative study of dike piping mechanism and evolution forecast thereof, avoid or effectively control failure by piping, Geotechnical Engineering and Hydraulic and Hydro-Power Engineering field application foundation Journal of Sex Research problem urgently to be resolved hurrily, to ensureing that the sustainable development tool of littoral resident's security of the lives and property and urban economy is of great significance.
Early-stage Study shows, piping relates to heterogeneous many coupling phenomenons of the 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 rearranges, deposits, cause soil body microscopical structure and mechanical characteristic to change, as inhomogeneous variation of porosity, perviousness, rigidity and shearing strength etc.The inhomogeneous variation of soil body penetration causes the pore water pressure of pore water medium to change.And then the effective stress that soil skeleton bears is changed thereupon, cause the variation of inside soil body stress state, stress state ground changes affects the distribution of the pore water pressure of pore water medium conversely again, and to soil skeleton ground erosion action, i.e. the evolution of piping is exactly the process of seepage flow-erosion-stress coupling effect.
But existing piping test unit has been ignored this seepage flow-erosion-stress coupling effect in piping evolution, some devices are 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 some devices cannot be considered the impact of the residing stress state of the soil body on piping.Therefore, achievement in research cannot comprehensively and objectively disclose the seepage inflow erosion 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 deficiency described above a kind of seepage inflow erosion stress coupling piping test unit is provided.
The following technical scheme of the present invention:
The invention provides a kind of seepage inflow erosion 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; In described base, arrange bakie, layout pressure chamber, base top, top cover is arranged on the top of pressure chamber; One end of rising pipe is connected with base outlet at bottom, the other end extends into measuring cup; Sample is arranged in pressure chamber and is built on base, between sample and base, arranges stephanoporate steel plate, and heat-shrink tube, top layout block are closely wrapped up in the outside of sample, fill cobble filtering layer in block; One end of axial pressure bar is connected with axial pressure device with block contact, the other end through top cover; Photoelectric sensor is arranged on the pipe shaft of rising pipe; Resistance strain gage is arranged on heat-shrink tube.
Seepage inflow erosion stress coupling piping test unit of the present invention, the through-hole aperture of described stephanoporate steel plate is 0.075mm-5mm.
Seepage inflow erosion stress coupling piping test unit of the present invention, also comprises permeate pressurization device, confined pressure pressurizer, displacement transducer, strain data collector, pore water pressure sensor; Described permeate pressurization device is connected with block by pipeline, confined pressure pressurizer is connected with base bottom by pipeline, Qie Yu pressure chamber is communicated with, displacement transducer is arranged in the top of axial pressure bar, strain data collector is connected with resistance strain gage, and pore water pressure sensor is connected with the stephanoporate steel plate of base top by pipeline.
Beneficial effect
Seepage flow-erosion-stress coupling piping test unit can consider that pore water seepage flow-fine grained corrodes the impacts of heterogeneous many coupling effects on soil body piping evolution such as migration-soil deformation, can the soil body of tracking and monitoring in three dimension stress state, under seepage effect, the dynamic changing process of movable fine particle content, porosity, perviousness, settling amount, rigidity, Shear Strength Index wherein.The piping evolution of the present invention's soil body from seepage flow-erosion-stress coupling angle research complex stress condition, for full appreciation soil body piping development mechanism provides new angle, by the prediction for dike piping dangerous situation and effective improvement, provide important theoretical foundation and technical support simultaneously.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention
In figure, 1 is base, 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, the present invention is described in more detail:
As shown in Figure 1: a kind of seepage inflow erosion 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.
The interior layout bakie of base 1, base 1 layout pressure chamber, top 2, 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 base 1, between sample 3 and base 1, arranges stephanoporate steel plate 11, and heat-shrink tube 4, top layout block 5, block 5 interior filling cobble filtering layers 6 are closely wrapped up in the outside of sample 3; One end of axial pressure bar 8 is connected with axial pressure device 9 with block 5 contacts, the other end through top cover 7; Photoelectric sensor 12 is arranged on the pipe shaft of rising pipe 10; Resistance strain gage 13 is arranged on 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 is tested.
Permeate pressurization device is connected with block 5 by pipeline, confined pressure pressurizer is connected with base (1) bottom by pipeline, Qie Yu pressure chamber (2) is communicated with, displacement transducer is arranged in the top of axial pressure bar 8, 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 by pipeline.
The method of testing of seepage inflow erosion stress coupling piping test unit, step is as follows:
(1) preparation, installation sample.First, according to dry density and water cut requirement, utilize special split cavity to prepare sample, sample outside surface adopts heat-shrink tube closely to wrap up.Secondly, (stephanoporate steel plate is mainly for separating of thickness material on base, to place the stephanoporate steel plate of aperture 2mm, the movable fine grain particle diameter of this test hypothesis is less than 2mm, in test, only particle diameter be less than the fine grained of 2mm can effluent test sample), sample is fixed on instrument base to tighten the screws.Finally, in sample top cover upper cap, attention will remain that sample is in vertical state, and unlikely generation eccentric compression when guaranteeing that the later stage is born axle pressure, affects 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 the same circumference near sample centre position, 4 resistance strain gages evenly being sticked on heat-shrink tube, each foil gauge angle differs 90 degree.In process of the test, collect the strain value of 4 resistance strain gages, get algebraic mean value as the hoop strain value of sample.
(3) apply ambient pressure.First, confined pressure chamber water-filling.Setting pressure chamber, notes sealing.Open the air release at top, pressure chamber, start slowly to add water to pressure chamber, when water is all full of pressure chamber and overflows from air release, tighten air release, close water intaking valve.Secondly, installation shaft is to pressure rod, adjustment (adjusting) lever balance.Installation shaft, to pressure rod, guarantees that axial pressure bar is just in time placed in the groove at block top, and fastening nut, guarantees close contact, and displacement transducer is positioned over to nut top, keeps close contact, and adjustment hammer, makes lever in equilibrium position.Finally, open confined pressure operation valve and start to apply ambient pressure, open draining valve simultaneously, sample starts consolidation process, and current, by rising pipe, enter measuring cup.
(4) apply axle pressure.According to the discharging consolidation process of sample, start axial pressure device, apply axle pressure.Add counterweight, lever becomes imbalance from balance, and spin balancing regulating device, until lever becomes balance again from imbalance.In loading procedure, adopt classification to apply, by displacement transducer, closely monitor the settling amount of sample in consolidation process, apply after first class pressure, when sample settling amount no longer changes, start to apply next stage pressure, until be loaded into the xial feed of requirement.After 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 Practical Project.
(5) apply seepage pressure.Open seepage pressure operation valve, start permeate pressurization device, start classification and apply seepage pressure, infiltration water stream enters sample by water inlet pipe, and by rising pipe, enters measuring cup.In this process, closely monitor following data:
(a)sample flow～infiltration gradient relation;
(b)turbidity～infiltration gradient relation of photoelectric sensor monitoring, the critical infiltration gradient while starting 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 sample occurs to destroy, stop experiment.
Arrange Experiment Result, set up the seepage flow-erosion-stress coupling constitutive equation that discloses piping evolution feature, and then build the coupling piping mathematical model of forecasting soil body piping generation evolution, for the piping dangerous situation of forecasting in advance and administer in Practical Project provides effective technical support.
Claims (3)
1. a seepage inflow erosion 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); In described base (1), arrange bakie, layout pressure chamber, base (1) top (2), 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 base (1), between sample (3) and base (1), arrange stephanoporate steel plate (11), heat-shrink tube (4), top layout block (5) are closely wrapped up in the outside of sample (3), fill cobble filtering layer (6) in block (5); One end of axial pressure bar (8) is connected with axial pressure device (9) with block (5) contact, the other end through top cover (7); Photoelectric sensor (12) is arranged on the pipe shaft of rising pipe (10); Resistance strain gage (13) is arranged on heat-shrink tube (4).
2. seepage inflow erosion stress coupling piping test unit according to claim 1, is characterized in that: the through-hole aperture of described stephanoporate steel plate (11) is 0.075mm-5mm.
3. seepage inflow erosion stress coupling piping test unit according to claim 1, is characterized in that: also comprise permeate pressurization device, confined pressure pressurizer, displacement transducer, strain data collector, pore water pressure sensor; Described permeate pressurization device is connected with block (5) by pipeline, confined pressure pressurizer is connected with base (1) bottom by pipeline, Qie Yu pressure chamber (2) is communicated with, displacement transducer is arranged in the top of axial pressure bar (8), 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 by pipeline.
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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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| CN102411042B true CN102411042B (en) | 2014-05-07 |
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| CN112504892B (en) * | 2020-11-19 | 2022-05-03 | 山东大学 | Contact surface particle erosion test device and method under normal pressure action |
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| JP3418801B2 (en) * | 1994-02-25 | 2003-06-23 | 株式会社サンケイ技研 | Water leak detection type flexible pipe joint |
| CN2355005Y (en) * | 1998-05-05 | 1999-12-22 | 水利部天津水利水电勘测设计研究院勘察院 | Water supplier for osmotic deformation instrument |
| CN2362897Y (en) * | 1998-12-24 | 2000-02-09 | 蔡莹 | Piping detecting instrument under water |
| CN1170136C (en) * | 2001-12-19 | 2004-10-06 | 中国科学院武汉岩土力学研究所 | Seepage test device for rock crack |
| US7971854B2 (en) * | 2007-09-24 | 2011-07-05 | Griswold Controls Inc | Replaceable valve shaft sealing system |
| CN201117150Y (en) * | 2007-09-24 | 2008-09-17 | 浙江大学 | Soil mass infiltration destruction phenomenon demonstration and critical hydraulic gradient measuring instrument |
| CN201817796U (en) * | 2010-07-10 | 2011-05-04 | 李顺柏 | Piping detector |
| CN101915724B (en) * | 2010-08-20 | 2012-06-27 | 河海大学 | Device and method for measuring permeability coefficient of rock material under action of seepage-stress coupling |
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