CN106404628B - A kind of adding pressure type low-permeability soil is rapidly saturated and permeates measuring equipment - Google Patents

A kind of adding pressure type low-permeability soil is rapidly saturated and permeates measuring equipment Download PDF

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Publication number
CN106404628B
CN106404628B CN201610749964.5A CN201610749964A CN106404628B CN 106404628 B CN106404628 B CN 106404628B CN 201610749964 A CN201610749964 A CN 201610749964A CN 106404628 B CN106404628 B CN 106404628B
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pipe
duplex
becomes
pressure type
adding pressure
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CN106404628A (en
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孙文静
陈超
魏振飞
孙德安
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University of Shanghai for Science and Technology
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University of Shanghai for Science and Technology
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
    • G01N15/08Investigating permeability, pore-volume, or surface area of porous materials
    • G01N15/082Investigating permeability by forcing a fluid through a sample
    • G01N15/0826Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change

Abstract

The present invention provides a kind of adding pressure type low-permeability soil and is rapidly saturated and permeates measuring equipment, can be used for the saturation and infiltration instrument manufacturing of geomaterial.The present apparatus includes adding pressure type duplex variable examining system, infiltration saturation chamber;Wherein adding pressure type duplex variable examining system becomes pipe measurement system with duplex by compression system and forms, and the solution that the air pressure that compression system applies can be such that duplex becomes in pipe rapidly enters soil sample, shortens test period;Duplex becomes pipe measurement system and is connected with infiltration saturation chamber, which is saturated chamber and can control soil sample height equipped with piston apparatus;And can measure the infiltration coefficient of soil sample under a variety of pressure, the permeability of the research soil body at various pressures.The device simple structure, easy to operate, practicability is good, and test efficiency can be improved, and has good application prospect.

Description

A kind of adding pressure type low-permeability soil is rapidly saturated and permeates measuring equipment
Technical field
The invention belongs to earthwork test Instrument equipment technical fields, and in particular to a kind of adding pressure type low-permeability soil is quickly full With and infiltration measuring equipment.
Background technique
Saturated soil refers to the intracorporal substantially water filled soil of hole of soil.Existing soil sample saturation process is by soil sample It is put into saturator, then places it in solution tank and freely impregnate saturation or pumping immersion saturation, this saturation process It takes time and effort and saturation effect is undesirable.Particularly with the extremely low cohesive soil of infiltration coefficient, existing saturation equipment is difficult to reach it To fully saturated, soil test error is caused.
The permeability of soil refers to that water permeates the performance of flowing in soil pores.The permeability of soil can use infiltration coefficient table Show, infiltration coefficient is the quantitative target of concentrated expression soil body penetration ability.The infiltration coefficient variation range of soil very big (10-1~10- 8Cm/s), osmotic coefficient investigating uses different methods according to the difference of soil nature.For cohesive soil, the general very little of infiltration coefficient, Under conventional extraneous hydraulic gradient, clay very slow by the seepage flow of soil sample, extremely low for infiltration coefficients such as bentonites is needed It takes several days or the longer time could form infiltration lane, cause varying head test abnormality time-consuming, efficiency is extremely low.
Summary of the invention
In view of the defects existing in the prior art, the present invention provides a kind of adding pressure type low-permeability soil and is rapidly saturated and infiltration capacity Device is surveyed, low-permeability clay can be rapidly saturated, and its saturation system can be carried out to soil sample in a short time Several measurements, has been greatly shortened test period, improves test efficiency.
In order to achieve the above objectives, the invention adopts the following technical scheme:
A kind of adding pressure type low-permeability soil is rapidly saturated and permeates measuring equipment, including adding pressure type duplex variable examining system And infiltration saturation chamber, the adding pressure type duplex variable examining system are connected with infiltration saturation chamber by outlet pipe.
The adding pressure type duplex variable examining system becomes tube top cap comprising compression system, duplex, duplex becomes tube bottom seat, Duplex becomes pipe and duplex becomes water inlet tube device;The top and bottom that the duplex becomes pipe fix duplex respectively and become tube top Cap and duplex become tube bottom seat, and duplex becomes pipe upper end and is connected with compression system, and applying pressure by compression system keeps solution fast Speed enters soil sample, shortens test period;Duplex becomes water inlet tube device and is connected to duplex change pipe top, and duplex becomes bottom of the tube Water outlet be connected with outlet pipe, water outlet be equipped with third valve.
The compression system includes main air inlet pipe, air gauge, the first valve, Pneumatic controller, outer layer air inlet pipe and interior Layer air inlet pipe;Air gauge and the first valve are provided in the main air inlet pipe, main air inlet pipe connects Pneumatic controller, air pressure control Device processed becomes pipe by outer layer air inlet pipe and internal layer air inlet pipe connected double-layer body.
It includes that internal layer body becomes pipe, outer layer lucite tube that the duplex, which becomes pipe, and internal layer body becomes pipe and is equipped with scale;It is described Duplex becomes water inlet tube device and is directly connected with internal layer body change pipe, and duplex, which becomes on water inlet tube device, is provided with water inlet and second Valve;The outer layer air inlet pipe is connected with outer layer lucite tube, and internal layer air inlet pipe becomes pipe with internal layer body and is connected, and gas is logical The gas that Pneumatic controller is divided into two bursts of same pressures is crossed, outer layer lucite tube is respectively enterd and internal layer body becomes pipe, protect It is identical to demonstrate,prove the air pressure that outer layer lucite tube and internal layer body become pipe, prevents internal layer body from becoming pipe inner and outer air pressure difference excessive, and occurs Deformation, influences the accuracy of test result.
The infiltration saturation chamber includes pedestal, piston apparatus, top cap, two-flap type cylinder, cranse device and sample;Institute It states two-flap type cylinder to be mounted on the base, the top cap is mounted on the top of two-flap type cylinder, and cranse device is by two-flap type cylinder Fixed, the sample is placed in the bottom of two-flap type cylinder, and the piston apparatus passes through top cap and is placed in two-flap type cylinder.
The pedestal includes water inlet pipe, the 4th valve, the first sink, water outlet circular hole, and the water inlet pipe is equipped with screw thread, with Outlet pipe is fixed, and water inlet pipe is equipped with the 4th valve;The cavity of chassis interior is the first sink, and the first sink top opens up water outlet Circular hole.
The top cap includes circular hole, water outlet pore, is equipped with the first screw thread on the inside of the circular hole, and bottom is equipped with the second screw thread, It is fixed with two-flap type cylinder top.
The piston apparatus includes piston rod, handle, piston, and the piston rod passes through the circular hole of top cap, and outer surface is set There is screw thread, is matched with the first screw thread and piston rod is fixed on arbitrary height;The handle is fixed on piston rod top end, the work Plug is fixed on piston rod bottom end, and piston is equipped with the second sink, and the bottom of the second sink is equipped with water inlet circular hole, and the second sink top is set There is apopore, apopore is pierced by water outlet pore by delivery hose and connects extraneous water outlet.
The two-flap type cylinder includes two-flap type cylinder top half, two-flap type cylinder lower half portion;Cranse device spiral shell Female, cranse fixes two-flap type cylinder.
The sample is the upper dankness stone on soil sample and top, and the lower permeable stone of lower part is simultaneously bundled together with rubber membrane, into As flexible wall structure form when row permeability test, prevent sample side wall from leaking.
Compared with prior art, the present invention has the advantages that following substantive distinguishing features outstanding and significant:
Experimental rig of the present invention connects pressurizing device, solution can be made to rapidly enter soil sample under pressure, keep soil sample fast Speed saturation;Also, solution under pressure, can be made to rapidly enter soil sample under larger hydraulic gradient, shorten soil body penetration examination Test the time.Cohesive soil lesser for infiltration coefficient, this advantage are especially apparent.It is certain that duplex change pipe can be used to system measurements The infiltration coefficient of the soil body under pressure, meanwhile, it can reduce and subtle flow, guarantee test result occurs since pressurization causes body to become pipe Accuracy;Measuring equipment of the present invention can measure the infiltration coefficient of soil sample under a variety of pressure, and the research soil body is at various pressures Permeability;Soil sample used and upper dankness stone, lower permeable stone are bundled together with rubber membrane, carry out can be used as flexibility when permeability test Wall construction form prevents sample side wall from leaking, improves the accuracy of test result;The infiltration is saturated chamber can equipped with piston apparatus Soil sample height is controlled, is saturated convenient for the soil sample to different height and measures infiltration coefficient;Further, since the infiltration is saturated chamber Room volume is larger, can disposably make large volume of saturated sample according to demand, is divided into soil sample with soil-cutter after saturation Size needed for multiple tests is tested, the homogenieity for improving saturation efficiency, ensuring saturated sample.
Detailed description of the invention
Fig. 1 is that adding pressure type low-permeability soil of the present invention is rapidly saturated and permeates measuring equipment total figure.
Fig. 2 is that duplex becomes pipe sectional view.
Fig. 3 is that duplex becomes tube section figure.
Fig. 4 is that water inlet duplex becomes tube section figure.
Fig. 5 is infiltration saturation chamber cross-sectional figure.
Fig. 6 is top cap sectional view.
Fig. 7 is top cap sectional view.
Fig. 8 is pedestal sectional view.
Fig. 9 is two-flap type cylinder cranse sectional view.
Figure 10 is piston apparatus sectional view.
Specific embodiment
Shown in reference to the accompanying drawing, following explanation is done to the specific embodiment of the invention.
As shown in Figure 1, a kind of adding pressure type low-permeability soil is rapidly saturated and permeates measuring equipment, including adding pressure type duplex Variable examining system and infiltration saturation chamber, the adding pressure type duplex variable examining system and infiltration saturation chamber pass through outlet pipe 11 are connected.
As shown in Figures 1 to 4, the adding pressure type duplex variable examining system includes compression system 45, duplex change tube top Cap 35, duplex become tube bottom seat 36, duplex becomes pipe 9 and duplex becomes water inlet tube device 6;The duplex becomes the upper end of pipe 9 It fixes duplex respectively with lower end and becomes tube top cap 35 and duplex change tube bottom seat 36, duplex becomes 9 upper end of pipe and compression system 45 It is connected, applying pressure by compression system 45 makes solution rapidly enter soil sample, shortens test period;Duplex becomes water inlet tube device 6, which are connected to duplex, becomes 9 top of pipe, and the water outlet 10 that duplex becomes 9 bottom of pipe is connected with outlet pipe 11, and water outlet 10 is equipped with Third valve 44.
The compression system 45 include main air inlet pipe 33, air gauge 1, the first valve 2, Pneumatic controller 34, outer layer into Tracheae 3 and internal layer air inlet pipe 4;Air gauge 1 and the first valve 2 are provided in the main air inlet pipe 33, main air inlet pipe 33 connects gas Pressure control device 34, Pneumatic controller 34 become pipe 9 by outer layer air inlet pipe 3 and 4 connected double-layer body of internal layer air inlet pipe.
It includes that internal layer body becomes pipe 7, outer layer lucite tube 8 that the duplex, which becomes pipe 9, and internal layer body becomes pipe 7 and is equipped with scale; The duplex becomes water inlet tube device 6 and is directly connected with internal layer body change pipe 7, and duplex, which becomes on water inlet tube device 6, to be provided with into water Mouth 42 and the second valve 5;The outer layer air inlet pipe 3 is connected with outer layer lucite tube 8, and internal layer air inlet pipe 4 and internal layer body become Pipe 7 is connected, and gas is divided into the gas of two bursts of same pressures by Pneumatic controller 34, respectively enters outer layer lucite tube 8 and internal layer body become pipe 7, guarantee outer layer lucite tube 8 and internal layer body become pipe 7 air pressure it is identical, prevent internal layer body from becoming in pipe 7 Outer draught head is not excessive, and deforms, and influences the accuracy of test result.
Such as Fig. 1, shown in Fig. 5 to Figure 10, the infiltration saturation chamber includes pedestal 15, piston apparatus, top cap 29, two-flap type Cylinder 20, cranse device and sample;The two-flap type cylinder 20 is mounted on pedestal 15, and the top cap 29 is mounted on two-flap type The top of cylinder 20, cranse device is fixed by two-flap type cylinder 20, and the sample is placed in the bottom of two-flap type cylinder 20, the work Plug device passes through top cap 29 and is placed in two-flap type cylinder 20.
The pedestal 15 includes water inlet pipe 13, the 4th valve 12, the first sink 16, water outlet circular hole 17, the water inlet pipe 13 It is equipped with screw thread, fixed with outlet pipe 11, water inlet pipe 13 is equipped with the 4th valve 12;Cavity inside pedestal 15 is the first sink 16,16 top of the first sink opens up water outlet circular hole 17.
The top cap 29 includes circular hole 32, water outlet pore 37, is equipped with the first screw thread 41 on the inside of the circular hole 32, bottom is equipped with Second screw thread 40 is fixed with 20 top of two-flap type cylinder.
The piston apparatus includes piston rod 27, handle 31, piston 24, and the piston rod 27 passes through the circular hole of top cap 29 32, outer surface is equipped with screw thread, matches with the first screw thread 41 piston rod 27 being fixed on arbitrary height;The handle 31 is fixed On 27 top of piston rod, the piston 24 is fixed on 27 bottom end of piston rod, and piston 24 is equipped with the second sink 22, the second sink 22 Bottom is equipped with water inlet circular hole 21, and apopore 23 is equipped at the top of the second sink 22, and apopore 23 is pierced by water outlet by delivery hose 28 Pore 37 connects extraneous water outlet 30.
The two-flap type cylinder 20 includes two-flap type cylinder top half, two-flap type cylinder lower half portion;Cranse device is used Nut 26, cranse 25 are fixed by two-flap type cylinder 20.
The sample is the upper dankness stone 19 on soil sample 18 and top, and the lower permeable stone 14 of lower part is simultaneously wrapped in rubber membrane 43 Together, prevent sample side wall from leaking as flexible wall structure form when progress permeability test.
In the present embodiment, internal layer body becomes 7 internal diameter of pipe as 10mm, and thick 3mm, interior outer layer lucite tube 8 is 40mm, outer wall With a thickness of 3mm, high 500mm;Internal layer body becomes on the right side of 7 upper end of pipe as water inlet 42, internal diameter 10mm, and with a thickness of 1mm, distance is double-deck The top 12.5mm of body change pipe 9;Duplex becomes 11 internal diameter of outlet pipe of 9 lower end of pipe as 10mm;The main air inlet pipe of compression system 45 33 internal diameters are 9mm;Duplex becomes the length of tube top cap 35 as 77mm, and width 28mm is highly 18mm, and duplex becomes tube bottom seat 36 length is 77mm, width 28mm, is highly 18mm.
29 internal diameter of top cap is 102mm in infiltration saturation chamber (Fig. 5), and with a thickness of 20mm, 32 internal diameter of circular hole is 12mm, is discharged 37 internal diameter of pore is 2mm.Complete two-flap type cylinder 20,20 upper half of two-flap type cylinder are pieced together by left valve cylinder and right valve cylinder Part internal diameter is 61.8mm, outer diameter 81.8mm, high 110mm, and lower half portion internal diameter is 61.8mm, outer diameter 85.8mm, height 90mm.Complete cylindrical drum top is equipped with the high 15mm of the second screw thread 40, and lower part also is provided with the high 15mm of screw thread;25 internal diameter of cranse is It 82mm, outer diameter 102mm, is highly 12mm, 26 diameter of nut is 3mm, long 20mm.15 internal diameter of pedestal is 86mm, outer diameter is 96mm, side thickness 5mm, bottom wall thickness 5mm, diameter 136mm, the high 20mm of screw thread at 15 side wall 39 of pedestal;13 internal diameter of water inlet pipe For 10mm;First sink, 16 diameter is 86mm high 10mm, and water outlet 17 diameter of circular hole is a height of 5mm of 40mm.The internal diameter of piston rod 27 For 12mm, length 196mm;The length of handle 31 is 48mm, with a thickness of 5mm;The internal diameter of piston 24 is 61.8mm, with a thickness of 24mm;The internal diameter of second sink 22 is 51.8mm, and with a thickness of 10mm, the internal diameter of apopore 23 is 2mm, the long 60mm of hose;It is used Upper dankness stone 19, lower permeable stone 14 internal diameter be all 61.8mm, with a thickness of 10mm;The length of rubber membrane 43 used is with soil sample height Variation and change.
Use example
Step 1: by 25 banding of cranse of two-flap type cylinder 20, test with soil put into batches infiltration be saturated in chamber into Reality is hit in row layering, and soil sample can be hit to the real soil sample 18 at arbitrary height in infiltration saturation chamber (Fig. 5).
Step 2: hit after the completion of reality, take out soil sample, with film forming bucket by rubber membrane 43 and soil sample 18 and upper dankness stone 19, under Permeable stone 14 wraps, and is put into infiltration saturation chamber (Fig. 5), with 25 banding two-flap type cylinder 20 of cranse.
Step 3: piston rod 27 is placed into infiltration saturation chamber (Fig. 5) together with piston 24, piston 24 pushes down rubber membrane 43.The top cap 29 of infiltration saturation chamber (Fig. 5) is covered into two-flap type cylinder 20, water outlet pore 37 of the delivery hose 28 from top cap 29 Middle exposing.The outlet pipe 11 that duplex becomes at 9 water outlet 10 of pipe is connected to infiltration saturation chamber (Fig. 5) water inlet pipe 13.
Step 4: opening the third valve 44 at duplex change 9 water outlet 10 of pipe, the second valve 5 at water inlet 42 seeps The 4th valve 12 at the water inlet pipe 13 of saturation chamber thoroughly, becomes pipe 7 by 42 inner layer body of water inlet and fills water, close the second valve Door 5.
Step 5: open the first valve 2 make air pressure respectively from outer layer air inlet pipe 3 enter outer layer lucite tube 8 and from Internal layer air inlet pipe 4 enters internal layer body and becomes pipe 7, starts to accelerate saturation.After the completion of saturation, become the variation of 7 head of pipe by internal layer body Carry out the measurement of infiltration coefficient.

Claims (9)

1. a kind of adding pressure type low-permeability soil be rapidly saturated and permeate measuring equipment, including adding pressure type duplex variable examining system with And infiltration saturation chamber, which is characterized in that the adding pressure type duplex variable examining system and infiltration saturation chamber pass through outlet pipe (11) it is connected;
The adding pressure type duplex variable examining system includes compression system (45), duplex becomes tube top cap (35), duplex becomes pipe Pedestal (36), duplex become pipe (9) and duplex becomes water inlet tube device (6);The duplex becomes the top and bottom point of pipe (9) Not Gu Ding duplex become tube top cap (35) and duplex and become tube bottom seat (36), duplex becomes pipe (9) upper end and compression system (45) It is connected, applying pressure by compression system (45) makes solution rapidly enter soil sample, shortens test period;Duplex becomes water inlet tube dress It sets (6) and is connected to duplex change pipe (9) top, the water outlet (10) that duplex becomes pipe (9) bottom is connected with outlet pipe (11), out The mouth of a river (10) is equipped with third valve (44).
2. adding pressure type low-permeability soil according to claim 1 is rapidly saturated and permeates measuring equipment, which is characterized in that institute State compression system (45) include main air inlet pipe (33), air gauge (1), the first valve (2), Pneumatic controller (34), outer layer into Tracheae (3) and internal layer air inlet pipe (4);Air gauge (1) and the first valve (2), main air inlet are provided on the main air inlet pipe (33) (33) connection Pneumatic controller (34) is managed, Pneumatic controller (34) is connected by outer layer air inlet pipe (3) and internal layer air inlet pipe (4) It connects duplex and becomes pipe (9).
3. adding pressure type low-permeability soil according to claim 1 is rapidly saturated and permeates measuring equipment, which is characterized in that institute Stating duplex to become pipe (9) includes that internal layer body becomes pipe (7), outer layer lucite tube (8), and internal layer body becomes pipe (7) and is equipped with scale;Institute It states duplex change water inlet tube device (6) to be directly connected with internal layer body change pipe (7), duplex, which becomes on water inlet tube device (6), to be provided with Water inlet (42) and the second valve (5);The outer layer air inlet pipe (3) is connected with outer layer lucite tube (8), internal layer air inlet pipe (4) become pipe (7) with internal layer body to be connected, gas is divided into the gas of two bursts of same pressures by Pneumatic controller (34), respectively Become pipe (7) into outer layer lucite tube (8) and internal layer body, guarantees that outer layer lucite tube (8) and internal layer body become pipe (7) Air pressure is identical, prevents internal layer body from becoming pipe (7) inner and outer air pressure difference excessive, and deforms, and influences the accuracy of test result.
4. adding pressure type low-permeability soil according to claim 1 is rapidly saturated and permeates measuring equipment, which is characterized in that institute Stating infiltration saturation chamber includes pedestal (15), piston apparatus, top cap (29), two-flap type cylinder (20), cranse device and sample; The two-flap type cylinder (20) is mounted on pedestal (15), and the top cap (29) is mounted on the top of two-flap type cylinder (20), hoop Coil apparatus is fixed by two-flap type cylinder (20), and the sample is placed in the bottom of two-flap type cylinder (20), and the piston apparatus passes through Top cap (29) is placed in two-flap type cylinder (20).
5. adding pressure type low-permeability soil according to claim 4 is rapidly saturated and permeates measuring equipment, which is characterized in that institute Stating pedestal (15) includes water inlet pipe (13), the 4th valve (12), the first sink (16), water outlet circular hole (17), the water inlet pipe (13) it is equipped with screw thread, fixed with outlet pipe (11), water inlet pipe (13) is equipped with the 4th valve (12);The internal sky of pedestal (15) Chamber is the first sink (16), and the first sink (16) top opens up water outlet circular hole (17).
6. adding pressure type low-permeability soil according to claim 4 is rapidly saturated and permeates measuring equipment, which is characterized in that institute Stating top cap (29) includes circular hole (32), water outlet pore (37), is equipped with the first screw thread (41) on the inside of the circular hole (32), bottom is equipped with Second screw thread (40) is fixed with two-flap type cylinder (20) top.
7. adding pressure type low-permeability soil according to claim 4 is rapidly saturated and permeates measuring equipment, which is characterized in that institute Stating piston apparatus includes piston rod (27), handle (31), piston (24), and the piston rod (27) passes through the circular hole of top cap (29) (32), outer surface is equipped with screw thread, matches with the first screw thread (41) piston rod (27) being fixed on arbitrary height;The handle (31) it is fixed on piston rod (27) top, the piston (24) is fixed on piston rod (27) bottom end, and piston (24) is equipped with the second water Slot (22), the bottom of the second sink (22) are equipped with water inlet circular hole (21), are equipped with apopore (23) at the top of the second sink (22), water outlet Hole (23) is pierced by water outlet pore (37) by delivery hose (28) and connects extraneous water outlet (30).
8. adding pressure type low-permeability soil according to claim 4 is rapidly saturated and permeates measuring equipment, which is characterized in that institute Stating two-flap type cylinder (20) includes two-flap type cylinder top half, two-flap type cylinder lower half portion;Cranse device nut (26), Cranse (25) is fixed by two-flap type cylinder (20).
9. adding pressure type low-permeability soil according to claim 4 is rapidly saturated and permeates measuring equipment, which is characterized in that institute The upper dankness stone (19) that sample is soil sample (18) and top is stated, the lower permeable stone (14) of lower part is simultaneously wrapped in one with rubber membrane (43) Rise, carry out permeability test when be used as flexible wall structure form, prevent sample side wall leakage.
CN201610749964.5A 2016-08-30 2016-08-30 A kind of adding pressure type low-permeability soil is rapidly saturated and permeates measuring equipment Active CN106404628B (en)

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CN110702583B (en) * 2019-10-23 2021-09-07 中南大学 Soil body infiltration dispersion leaching test integrated column
CN111896449B (en) * 2020-07-14 2021-06-01 中国海洋大学 Permeameter and method for measuring permeability coefficient of saturated silt

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CN102401778A (en) * 2011-04-20 2012-04-04 河海大学 Device and method for measuring swelling representation parameters of swelling soil
CN202853970U (en) * 2012-10-17 2013-04-03 铁道第三勘察设计院集团有限公司 Air pressure loading device of stress type triaxial apparatus
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