CN101226130A - Method for regulating and controlling water pressure of seepage flow water outlet end - Google Patents
Method for regulating and controlling water pressure of seepage flow water outlet end Download PDFInfo
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- CN101226130A CN101226130A CNA2008100452535A CN200810045253A CN101226130A CN 101226130 A CN101226130 A CN 101226130A CN A2008100452535 A CNA2008100452535 A CN A2008100452535A CN 200810045253 A CN200810045253 A CN 200810045253A CN 101226130 A CN101226130 A CN 101226130A
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Abstract
The invention relates to a water pressure regulation method at seepage water outlet end, which comprises connecting a pipe filter with a sample seepage water outlet end, using a speed-regulating valve connected with the pipe filter to regulate the flux of the seepage water outlet end in 0-10L/min to keep stable seepage quantity at the water outlet end. When the water pressure at the seepage inlet end is stable and the sample seepage is balance with the regulation flux, the effusion end generates stable water pressure and forms stable water pressure difference at two ends of the sample. When the seepage water pressure difference and the flux are stable, the permeability test in the time section meets darcy law to obtain the sample permeability index at relative conditions. The invention has low cost, which resolves the high-pore water pressure and low hydraulic gradient simulation test of project to provide reliable water pressure regulation method at seepage water outlet end for sample permeability and mechanical property research.
Description
Technical field:
The present invention is used for perviousness mechanical property testing and failure mechanism research thereof under rock (body) perviousness and high pore water pressure thereof, the small hydro gradient condition, particularly be method for regulating and controlling water pressure of seepage flow water outlet end.
Background technology:
According to experimental principle, indoor permeability test method can be divided into two big classes: a class is to apply differential water pressures certain or that change at the two ends of test specimen, comes the infiltration coefficient of calculation testing piece by measuring seepage discharge, and traditional deciding water level and become water level method promptly belongs to this type of; Another kind of is that a end to test specimen is with the certain flow water filling or the pulse of directly exerting pressure, by measuring between the test specimen two ends pressure differential infiltration coefficient of calculation testing piece over time.Testing permeability mainly exists two big technological difficulties, the one, the foundation of steady seepage differential water pressures, the 2nd, the mensuration of seepage flow.Adopted respectively to keep sample in the past, needed to adopt two cover servo-control systems into and out of the stable separately water pressure of water end (W.E.).Universal test device as designs such as Zhang Ming adopts high-performance stream pump, the FDES-641 displacement evaluation system that the American core company that introduces in oil recovery research institute reservoir physics laboratory produces improves in Oil Exploration in China development research institute, and the method for the flow velocity (being controlled to be same flow velocity) by accurate control import and export end pump makes the sample two ends produce stable differential water pressures.This method is high to the performance requirement of instrument, is difficult for long-term stability, and difficult can the popularization generally used.
Along with the further investigation to the hyposmosis rock, the instantaneous pressure impulse method is widely adopted and approves.This method is the perviousness of testing rock sample according to hydraulic pressure equilibrium of forces and time relation, it has ignored the compressibility of fluid and the pore compressibility of rock (body) in the rock sample, the distortion of pipeline and the leakage of pipeline, and the precision of differential pressure pickup is relatively low, and duration of test runs length must influence test result.Seepage flow water outlet mouth end water pressure is a variable, and the suffered pore water pressure of actual rock mass does not change in time, this just is not inconsistent with the actual suffered pore water pressure situation of rock sample, and difficulty can be at the perviousness and the relevant mechanical property testing of rock (body) total stress, strain path under high pore water pressure condition.
Summary of the invention:
The objective of the invention is in order to overcome above deficiency, provide a kind of cost low, can solve the actual existing high pore water pressure of engineering, the test of small hydro gradient real simulation, for rock (body) perviousness and mechanical property research thereof provide reliable research basic method for regulating and controlling water pressure of seepage flow water outlet end.
The object of the present invention is achieved like this:
Method for regulating and controlling water pressure of seepage flow water outlet end of the present invention, this method is at sample seepage flow water outlet end connecting line filtrator, the flow speed control valve that is connected with in-line filter, the seepage flow water outlet end flow is regulated and control at 0～10L/min, make in water side maintenance stable flow rate, as long as guarantee that seepage flow entrance point water pressure is constant, when the flow of the seepage flow of sample and adjusting reaches balance, then oozing out the stable hydraulic pressure value of end generation, and then form stable differential water pressures at the sample two ends, when infiltration water pressure reduction and seepage flow all remain unchanged, then should meet Darcy's law by the period testing permeability, and then obtain the perviousness index of lithosome under the corresponding conditions.
Above-mentioned in-line filter filtering accuracy is 3 μ m, can prevent that particulate matter from stopping up the flow speed control valve pipeline, and flow speed control valve is the manual governing valve.
Flow speed control valve is used to regulate and control the flow of water among the present invention, is equipped with in-line filter the seepage flow water body is filtered, and has solved the difficult problem of current impurity obstruction flow speed control valve.This method can make the water side keep a certain stable flow rate, experiment showed, that water flow can regulate arbitrarily by 0～10L/min.As long as control seepage flow water inlet end water pressure is stable,, then can oozing out stable hydraulic pressure value of end generation, and then form stable differential water pressures at the sample two ends when the seepage flow of sample and the flow of adjusting reach balance.This method has solved foundation, the maintenance problem of water pressure of seepage flow water outlet end in the rock seepage tests.Cost is low.
Description of drawings:
Fig. 1 is a regulation device structural representation of the present invention.
Fig. 2 is a sample perviousness measured result under the confined pressure 10MPa.
Embodiment:
Referring to Fig. 1, method for regulating and controlling water pressure of seepage flow water outlet end, this method is that the manual governing valve 2 that is connected with in-line filter is regulated and control the seepage flow water outlet end flow at sample seepage flow water outlet end connecting line filtrator 1, makes in water side maintenance stable flow rate.As long as guarantee that seepage flow entrance point water pressure is constant, when the flow of the seepage flow of sample and adjusting reaches balance, then can ooze out the stable hydraulic pressure value of end generation, and then form stable differential water pressures at the sample two ends.When infiltration water pressure reduction and flow all remain unchanged, then should meet Darcy's law by the period testing permeability, and then can obtain the perviousness index of lithosome under the corresponding conditions.
Fig. 2 is at a certain lithology sample, and flow speed control valve control carrying out measured result is adopted in the water side.Water inlet end hydraulic pressure remains 4.36MPa among the figure, and between the water pressure fluctuations amplitude 0.27～0.31MPa of water side, desirable water side stable water pressure segment data is carried out testing permeability, promptly 14～29 minutes segment datas, and its permeable pressure head fluctuating range is within the 0.02MPa scope.From the situation of change (being called for short the body variable the figure) of water seepage volume, itself and time relation are in linear relation substantially, illustrate that this period has reached stable seepage flow state.Permeable pressure head, seepage flow all reach steady state (SS), promptly should the period Penetration Signature satisfy Darcy's law, and then can calculate corresponding perviousness index.
The foregoing description is that foregoing of the present invention is further described, but this should be interpreted as that the scope of the above-mentioned theme of the present invention only limits to the foregoing description.All technology that realizes based on foregoing all belong to scope of the present invention.
Claims (2)
1. method for regulating and controlling water pressure of seepage flow water outlet end, this method is at sample seepage flow water outlet end connecting line filtrator, the flow speed control valve that is connected with in-line filter, the seepage flow water outlet end flow is regulated and control at 0～10L/min, make in water side maintenance stable flow rate, as long as guarantee that seepage flow entrance point water pressure is constant, when the flow of the seepage flow of sample and adjusting reaches balance, then oozing out the stable hydraulic pressure value of end generation, and then form stable differential water pressures at the sample two ends, when infiltration water pressure reduction and seepage flow all remain unchanged, then should meet Darcy's law by the period testing permeability, and then obtain the perviousness index of sample under the corresponding conditions.
2. water pressure of seepage flow water outlet end method of adjustment as claimed in claim 1 is characterized in that the in-line filter filtering accuracy is 3 μ m, can prevent that particulate matter from stopping up the flow speed control valve pipeline, and flow speed control valve is the manual governing valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100452535A CN101226130A (en) | 2008-01-25 | 2008-01-25 | Method for regulating and controlling water pressure of seepage flow water outlet end |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008100452535A CN101226130A (en) | 2008-01-25 | 2008-01-25 | Method for regulating and controlling water pressure of seepage flow water outlet end |
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| CN101226130A true CN101226130A (en) | 2008-07-23 |
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| CNA2008100452535A Pending CN101226130A (en) | 2008-01-25 | 2008-01-25 | Method for regulating and controlling water pressure of seepage flow water outlet end |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102539039A (en) * | 2011-12-20 | 2012-07-04 | 清华大学 | Method and equipment for measuring friction torque of radially loaded bearing |
| CN104483202A (en) * | 2014-12-15 | 2015-04-01 | 成都理工大学 | Test system for rock breaking mode at high ground stress and osmotic pressure |
| CN108375533A (en) * | 2017-10-11 | 2018-08-07 | 同济大学 | A kind of voltage stabilizing of the full coupled shear-flow test of rock joint and pressure difference control system |
| CN109470616A (en) * | 2018-10-31 | 2019-03-15 | 重庆大学 | Rock multifunction seepage test macro |
-
2008
- 2008-01-25 CN CNA2008100452535A patent/CN101226130A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102539039A (en) * | 2011-12-20 | 2012-07-04 | 清华大学 | Method and equipment for measuring friction torque of radially loaded bearing |
| CN102539039B (en) * | 2011-12-20 | 2015-04-01 | 清华大学 | Method and equipment for measuring friction torque of radially loaded bearing |
| CN104483202A (en) * | 2014-12-15 | 2015-04-01 | 成都理工大学 | Test system for rock breaking mode at high ground stress and osmotic pressure |
| CN108375533A (en) * | 2017-10-11 | 2018-08-07 | 同济大学 | A kind of voltage stabilizing of the full coupled shear-flow test of rock joint and pressure difference control system |
| CN109470616A (en) * | 2018-10-31 | 2019-03-15 | 重庆大学 | Rock multifunction seepage test macro |
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Open date: 20080723 |