CN1312466C - Flexible wall permeameter for measuring coefficient of permeability - Google Patents

Abstract

The invention is a flexible-wall permeameter for measuring the permeability coefficient. Its structure is that the confining pressure pipeline, drainage pipeline and water inlet pipeline in the hydraulic system are respectively connected to the pressure chamber of the permeameter through a control valve, and the confining pressure pipeline and drainage The pipeline and water inlet pipeline are respectively connected in series with pressure gauge, air pressure regulating valve, pressure supply equipment and B body variable pipe, pressure gauge, air pressure regulating valve, pressure supply equipment and C body variable pipe, pressure gauge, air pressure regulating valve , Pressure supply equipment, air pressure regulating valve connected to the water outlet of the water tank. Advantages: It can measure the application water head at any time point, and the accuracy is within 5%. The water is controlled by the control valve and enters the pipeline. reach the pressure required for the test. It can degas quickly and for a long time. Fit that responds to pressure changes. It meets the accuracy requirements of mass water measurement and effectively avoids the leakage of the sample side wall. The counter pressure saturation speed of the soil sample in the sample chamber is fast, and the test time is short.

Description

A kind of flexible wall permeameter of measuring infiltration coefficient

Technical field

What the present invention relates to is a kind of flexible wall permeameter of measuring infiltration coefficient, belongs to surveying instrument

Technical field.

Background technology

Prior art such as sclerine permeameter, it can't avoid sample sidewall seepage.And the soil sample back-pressure saturated velocity in the sample chamber is slow, and test period is long.

Summary of the invention

The objective of the invention is to defective at above-mentioned existence, a kind of flexible wall permeameter is proposed, it is on the basis of normal triaxial instrument, through transforming, water inlet water head equipment, water outlet water head equipment and water yield measuring equipment have been increased, and the pressure chamber is transformed, can effectively avoid sample sidewall seepage.Technical solution of the present invention: its structure is the branch Hydraulic Power System, water yield measurement system and osmometer pressure chamber three parts, the confined pressure pipeline in the Hydraulic Power System wherein, discharge pipe line, inlet pipeline inserts in the osmometer pressure chamber by operation valve respectively, be connected in series tensimeter respectively on confined pressure pipeline in the Hydraulic Power System and discharge pipe line and the inlet pipeline, the air pressure regulator valve, B body in voltage supply equipment and the water yield measurement system becomes pipe, tensimeter, the air pressure regulator valve, C body in voltage supply equipment and the water yield measurement system becomes pipe, tensimeter, the air pressure regulator valve, voltage supply equipment, the water delivering orifice of air pressure regulator valve water receiving case.Advantage of the present invention: Hydraulic Power System can satisfy in office when putting is measured the application head, and in the precision controlled 5%, has the effective measures of measuring water pressure in the deviation of regulation.The water that is stored in the water tank enters pipeline by operation valve control, and the pressure in the voltage supply equipment can be regulated by the air pressure regulator valve, and the numerical value of controlled pressure is shown by tensimeter, guarantees that the water in the pipeline reaches needed pressure in the test.The flow measuring system volume is little, in the time of growing simultaneously, quick degasification.The cooperation that response pressure changes.Do not use the rigidity flow measuring system, satisfy the accuracy requirement that the water yield in enormous quantities is measured, segment length is ± 5% during its flow measurement.The present invention can avoid sample sidewall seepage effectively.And the soil sample back-pressure saturated velocity in the sample chamber is fast, and test period is short.

Description of drawings

Accompanying drawing 1 is a structural representation of the present invention

1 ° among the figure is voltage supply equipment; The 1st, water tank; 2 is first operation valves; 3 is second operation valves; 4 is the 3rd operation valves; 5 is the 4th operation valves, the exhaust of top, pressure chamber; 6 is the 4th operation valves, enters in the fexible film chamber, bottom, pressure chamber; 7 is the 5th operation valves, enters in the fexible film chamber, top pressure chamber; 8 is the 6th operation valves, pressure chamber's base bleed; 9 is first air pressure regulator valves, is located on the confined pressure pipeline; 10 is second air pressure regulator valves, is located on the outlet pipeline; 11 is the 3rd air pressure regulator valves, is located on the inlet pipeline; 12 is first tensimeters, is located on the outlet pipeline; 13 is second tensimeters, is located on the inlet pipeline; 14 is the 3rd tensimeters, is located on the confined pressure pipeline; The 15th, the B body on the outlet pipeline becomes pipe; The 16th, the C body on the inlet pipeline becomes pipe; The 17th, the draining valve on the outlet pipeline; The 18th, the draining valve on the inlet pipeline; The 19th, inlet pipeline; The 20th, outlet pipeline; The 21st, the pressure chamber; The 22nd, axle; The 23rd, end cap; The 24th, porous plate; The 25th, sample; The 26th, pedestal; The 27th, the confined pressure pipeline.Operation valve in above-mentioned, air pressure regulator valve, B, C body become pipe, voltage supply equipment belongs to prior art.

Embodiment

Contrast accompanying drawing 1, its structure is branch Hydraulic Power System, water yield measurement system and osmometer pressure chamber 21 3 parts, wherein the confined pressure pipeline 27 in the Hydraulic Power System, discharge pipe line 20, inlet pipeline 19 insert in the osmometer pressure chambers 21 by the 3rd operation valve 4, the 5th operation valve 7, the 4th operation valve 6 respectively, 1 ° on serial connection the 3rd tensimeter 14 on the confined pressure pipeline 27 in the Hydraulic Power System, the first air pressure regulator valve 9, voltage supply equipment; B body on the discharge pipe line 20 in the serial connection water yield measurement system becomes 1 ° on pipe 15, first tensimeter 12, the second air pressure regulator valve 10, voltage supply equipment; C body on the inlet pipeline 19 in the serial connection water yield measurement system becomes 1 ° on pipe 16, second tensimeter 13, the 3rd air pressure regulator valve 11, voltage supply equipment; The water delivering orifice of the 3rd air pressure regulator valve 11 water receiving casees 1.

Pressure in the Hydraulic Power System comprises confined pressure, water feeding pressure and tail water hydraulic pressure.The water that is stored in the water tank enters pipeline by operation valve control, and the pressure in the voltage supply equipment is by the regulating action of air pressure regulator valve, and comes the numerical value of controlled pressure by tensimeter, can make the water in the pipeline reach needed pressure in the test.In office when putting measure to be used head and precision in 5%, has the measure of measuring water pressure in the deviation of regulation, and pressure chamber's head, water inlet head and water outlet head are provided, and constant head or varying head are provided.Have the ability to keep flow mobility scale through sample in ± 5%, the mensuration of flow is by the pipette or the adaptive instrument of other precision of band scale.

There are C, B body to become pipe 16,15 in the water yield measurement system.Become liquid level variation in the pipe 16,15 by C, B body, can read the amount of inlet water and the water outlet water yield.The flow measuring system volume is little, in the time of growing, fast degasification.The cooperation that response pressure changes.Without the rigidity flow measuring system, use rigid pipe such as metal tube or hard plastic tube one class.To the accuracy requirement that the water yield in enormous quantities is measured, segment length is ± 5% during its flow measurement.

Osmometer pressure chamber 21 has pressure chamber's inflow hydrograph, the inflow hydrograph exhausr port that connects the inlet pipeline 19 in the Hydraulic Power System and the pressure chamber's discharge line that is connected discharge pipe line 20, discharge line exhausr port and connects the inlet of confined pressure pipeline 27, on the end cap 23 of osmometer pressure chamber 21, establish axle 22, axle 22 is provided with sensor, between end cap 23 and the pedestal 26 two porous plates 24 is set, put sample 25 in the middle of the two porous plates 24, be enclosed within the outside of end cap 23, two porous plates 24 and pedestal 26 with flexible membrane, flexible membrane is fixed at end cap 23 and pedestal 26 places with O type circle.

During work, after sample installed, fills with water in the pressure chamber, with pressure chamber's sealing, behind the bubble in inflow hydrograph exhaust and discharge line exhaust eliminating pipeline and the sample, apply confined pressure simultaneously then, intake pressure and discharge pressure make the pressure requirement that reaches in the test.By the variation that the strain transducer that is installed on the axle is measured sample thickness, provide the data of thickness for the calculating of infiltration coefficient.Use fluid-tight a, rigid end cap and pedestal to support sample, be delivered to sample for liquid stabilising simultaneously or row provides support from sample.The diameter of end cap and pedestal or width accuracy are ± 5%.

Claims (1)

1. A flexible-wall permeameter for measuring permeability coefficient is characterized in that it is divided into three parts: hydraulic system, water volume measurement system and permeameter pressure chamber (21), wherein the confining pressure pipeline (27) and drain pipe in the hydraulic system Road (20) and water inlet pipeline (19) are respectively connected to the pressure chamber (21) of the permeameter through the third control valve (4), the fifth control valve (7) and the fourth control valve (6); in the hydraulic system The confining pressure pipeline (27) is connected in series with the third pressure gauge (14), the first air pressure regulating valve (9), and the pressure supply equipment (1°); the drainage pipeline (20) is connected in series with the water volume measurement system The B body variable pipe (15), the first pressure gauge (12), the second air pressure regulating valve (10), and the pressure supply equipment (1°); The C body variable pipe (16), the second pressure gauge (13), the third air pressure regulating valve (11), the pressure supply equipment (1°); the third air pressure regulating valve (11) is connected to the water tank (1) Water outlet; the described osmometer pressure chamber (21) has the pressure chamber water inlet line that connects the water inlet pipeline (19) in the hydraulic system, the water inlet line exhaust port and the pressure chamber drainage that connects the drainage pipeline (20) line, drain line exhaust port and the inlet connected to the confining pressure pipeline (27), the shaft (22) is set on the end cover (23) of the pressure chamber (21) of the permeameter, and the sensor is arranged on the shaft (22). Two porous plates (24) are arranged between the cover (23) and the base (26), the sample (25) is placed in the middle of the two porous plates (24), and the end cover (23), the two porous plates are covered with a flexible film. On the outside of the plate (24) and the base (26), the flexible membrane is fixed at the end cover (23) and the base (26) with an O-ring.