CN215866289U - Reciprocating variable water head gradient ratio permeameter - Google Patents
Reciprocating variable water head gradient ratio permeameter Download PDFInfo
- Publication number
- CN215866289U CN215866289U CN202121606528.5U CN202121606528U CN215866289U CN 215866289 U CN215866289 U CN 215866289U CN 202121606528 U CN202121606528 U CN 202121606528U CN 215866289 U CN215866289 U CN 215866289U
- Authority
- CN
- China
- Prior art keywords
- water
- permeameter
- sand
- gradient ratio
- chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Revetment (AREA)
Abstract
The utility model discloses a reciprocating variable water head gradient ratio permeameter, which comprises: the system comprises a reciprocating variable water head water supply module and a gradient ratio permeameter module, wherein the reciprocating variable water head water supply module provides reciprocating variable water head water flow for the gradient ratio permeameter module; the gradient ratio permeameter module is used for researching the seepage characteristic of the geotextile sand-lined system; the utility model aims to break through the limit of the constant head of the traditional gradient ratio permeability test and the phenomenon of high construction cost of the large wave pool or field test, is applied to the gradient ratio permeameter test, can provide different types of reciprocating variable head permeable water flows according to the needs of researchers, simulates the process of scouring the geotextile sand-lined system by the permeable water flows, and is used for exploring the permeability characteristic of the geotextile sand-lined system under the action of the reciprocating variable head.
Description
Technical Field
The utility model relates to a simulation experiment device, in particular to a reciprocating variable water head gradient ratio permeameter.
Background
In engineering practice, the tube bag dam is located at the offshore and estuary coast, and is subjected to the action of waves, tides and the like for a long time, water pressure difference is caused in the process that water level fluctuation changes along with time, the filled sandy soil in the tube bag dam risks being washed and lost by water flow, in practical engineering, a large amount of dam body seepage erosion also occurs, particularly under the action of reciprocating variable water flow of waves and tides, the water flow in front of the tube bag dam body impacts the geotechnical tube bag dam body repeatedly at a very high pressure and a high flow rate period, and meanwhile, the water flow head of the water flow has the characteristic of changing along with time, so that the sandy soil in the dam body and the dam core is continuously lost, and great hidden danger is brought to the safety of the dam body structure. The pipe bag dam is different from the traditional earth-rock dam, has the heterogeneous characteristic, namely the pipe bag dam is a heterogeneous system formed by bag body geotextile and bag filled sand, although the experimental research on the permeability characteristic of the fabric sand-coated system at home and abroad obtains good results, the seepage characteristic of the fabric sand-coated system under the action of a reciprocating variable water head is still not clear enough, and the establishment of the seepage field of the pipe bag dam as a water retaining building is greatly limited.
At present, the test research methods for researching the reverse filtration characteristics of the fabric sand-lined system are various and mainly comprise a gradient ratio test, a reduced head permeation test and a normal pressure permeation test. However, the above method has the following disadvantages as can be found by comparative analysis:
1. most of the geotextiles are used for monitoring the permeability characteristics under the action of a normal pressure water head or a unidirectional variable water head, but when the geotextiles are used for actual reverse filtration engineering, complex conditions such as various water loads, outflow states, seepage directions and the like are often met;
2. under the existing test conditions, in order to complete the seepage characteristic research of the fabric sand-lined system under the action of the reciprocating variable water head, a large tidal wave pool is usually used for testing, the operation is complex, and time and labor are consumed. The existing test instrument is inconvenient to research the seepage characteristics of the fabric sand-lined system under the action of various reciprocating variable water heads.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a reciprocating variable head gradient ratio permeameter, which can provide different types of reciprocating variable head permeating water flow according to the needs of researchers, simulate the process of the permeating water flow to scour a geotextile sand-lined system, and is used for researching the permeability characteristic of the geotextile sand-lined system under the action of the reciprocating variable head so as to solve the problems in the prior art.
The technical scheme of the utility model is as follows: a reciprocating variable head gradient permeameter comprising: a reciprocating variable water head water supply module and a gradient ratio permeameter module,
the reciprocating variable water head water supply module provides reciprocating variable water head water flow for the gradient ratio permeameter module;
the gradient ratio permeameter module is used for researching the seepage characteristic of the geotextile sand-lined system;
preferably, the reciprocating variable water head water supply module comprises a servo motor, a screw rod lifter, a synchronous lifting platform, a piston and a water source box; the servo motor is located right above the lead screw lifter and used for driving the lead screw lifter to rotate, the synchronous lifting platform is attached to the lead screw lifter and can lift along with the rotation of a lead screw, the piston is fixedly connected with the synchronous lifting platform through a straight rod and is connected with the water source box in a sliding mode, and the joint is sealed through a sealing water stop ring.
Preferably, the servo motor is controlled by a speed regulator to rotate at a certain period and angular speed, and the piston can make reciprocating linear motion with sine periodic change of speed in the water source box through transmission;
preferably, the gradient ratio permeameter module includes: the geotextile sand bag comprises a water inlet chamber, a sand chamber and a water outlet chamber, wherein the water inlet chamber is communicated with a water source box leftwards and is communicated with the sand chamber rightwards, a geotextile is clamped between the sand chamber and the water inlet chamber, one side of the water inlet chamber, which is close to the sand chamber, is provided with a pore water pressure sensor, the sand chamber is communicated with the water outlet chamber rightwards, a hole-containing base plate is arranged between the sand chamber and the water outlet chamber, the left side of the hole-containing base plate is fixedly connected with a gauze, and one side of the sand chamber, which is close to the water inlet chamber, is provided with three pore water pressure sensors at equal intervals.
Preferably, the upper part of the sand chamber is provided with a hole for filling sand, and a cover plate is arranged on the hole.
Preferably, the bottom of the water outlet chamber is provided with a liquid level sensor, the upper part of the water outlet chamber is communicated with the atmosphere, and the port of the computer is also connected with an acquisition card which is used for acquiring and analyzing the data of the pore water pressure sensor and the micro liquid level sensor.
Compared with the prior art, the utility model has the advantages that:
firstly, a reciprocating variable water head water supply system is developed by self, a speed regulating motor is used for driving, the circumferential motion of a crankshaft is converted into the sinusoidal linear motion of a piston through a screw rod lifter and a synchronous lifting platform, the periodic compression of a water body in a water source box is realized, and a stable reciprocating variable water head is provided for a gradient ratio permeameter module, so that the impact of a complex variable water flow on a pipe bag dam is simulated;
and secondly, by combining the reciprocating variable water head module with the gradient ratio permeameter module, the limitation of a field and a constant head in the traditional gradient ratio test is broken through, the research on the seepage characteristic of the geotextile sand-lined system under the reciprocating variable water head effect in a conventional laboratory can be realized, and reference data can be conveniently provided for engineering practice.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
In the figure: 1-servo motor, 2-screw rod lifter, 3-synchronous lifting platform, 4-piston, 5-water source box, 6-straight rod, 7-sealing water stop ring, 8-speed regulator, 9-water inlet chamber, 10-sand chamber, 11-water outlet chamber, 12-geotextile, 13-pore water pressure sensor, 14-perforated pad plate, 15-gauze, 16-cover plate, 17-liquid level sensor, 18-computer, 19-acquisition card.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the utility model easy to understand, the utility model is further described with the specific embodiments.
As shown in fig. 1, a reciprocating variable head gradient ratio permeameter includes: the reciprocating variable water head water supply module is used for providing reciprocating variable water head water flow for the gradient ratio permeameter module;
the gradient ratio permeameter module is used for researching the seepage characteristic of the geotextile 12 sand-lined system;
in the embodiment, the reciprocating variable water head water supply module comprises a servo motor 1, a screw rod lifter 2, a synchronous lifting platform 3, a piston 4, a speed regulator 8 and a water source box 5; the servo motor 1 is controlled by a speed regulator 8 to rotate at a certain period and angular speed,
the servo motor 1 is used for driving the screw rod lifter 2 to rotate, and the synchronous lifting platform 3 is attached to the screw rod lifter 2 and can lift along with the rotation of a screw rod. The piston 4 is fixedly connected with the synchronous lifting platform 3 through a straight rod 6, and the piston 4 is in sliding connection with the water source box 5 and can do reciprocating linear motion with sine periodic variation in speed in the water source box 5. In order to improve the sealing performance, a sealing water stop ring 7 is used for sealing the joint of the piston 4 and the water source tank 5.
In this embodiment, the gradient ratio permeameter module includes: the sand-water separation device comprises a water inlet chamber 9, a sand chamber 10, a water outlet chamber 11, a water inlet chamber 9, the sand chamber 10 and the water outlet chamber 11 which are sequentially connected, wherein the three chambers are hermetically connected through a flange plate, a geotextile 12 is clamped between the sand chamber 10 and the water inlet chamber 9, one side of the water inlet chamber 9 close to the sand chamber 10 is provided with a pore water pressure sensor 13, the pore water pressure sensor 13 is used for monitoring the distribution condition of water pressure in the device, a perforated base plate 14 and a gauze 15 are arranged between the sand chamber 10 and the water outlet chamber 11, the gauze 15 is positioned on the left side of the perforated base plate 14, one side of the sand chamber 10 close to the water inlet chamber 9 is provided with three pore water pressure sensors 13 at equal intervals, the distance from the pore water pressure sensor 13 in the water inlet chamber 10 to the geotextile 12 is equal to the interval of the three pore water pressure sensors 13 in the sand chamber 10, the distances from the four pore water pressure sensors 13 are equal, and the bottom of the water outlet chamber 11 is provided with a liquid level sensor 17, the water level data acquisition device is used for acquiring water level data of the water outlet chamber 11, and the upper part of the water outlet chamber 11 is communicated with the atmosphere.
In this embodiment, in order to facilitate the addition of the sand material into the sand chamber 10, a filling hole is formed in the upper portion thereof. The cover plate 16 is used to seal the sand chamber 10 after the sample is filled, and to prevent the sample from settling due to the deformation of the geotextile 12 during the filling process, which leads to the washthrough of the side wall.
In this embodiment, the port of the computer 18 is further connected to an acquisition card 19, and the acquisition card 19 is used for acquiring and analyzing data of the pore water pressure sensor 13 and the micro liquid level sensor 17. The hydraulic parameters such as water pressure in the device can be monitored and analyzed.
The working process and the principle thereof are as follows:
before the test, ensure that each part of the device is complete and can work normally.
Sand samples, geotextiles 12, gauze 15 were prepared. Calculating the amount of sand sample required according to the capacity of the sand chamber 10, and cutting the geotextile 12 and the gauze 15 with the area slightly larger than the sectional area of the sand chamber 10 according to the sectional area of the sand chamber 10;
geotextile 12 and gauze 15 are installed. Placing a geotextile 12 between the water inlet chamber 9 and the sand chamber 10, placing a gauze 15 between the sand chamber 10 and the water outlet chamber 11, sealing by using a water-stopping adhesive tape, and fastening by using bolts;
adding water for the first time. After the equipment is assembled and water is ensured not to leak, water is added along the upper part of the water outlet chamber 11 or the hole at the upper part of the sand chamber 10, and the water adding is stopped when the water adding level is about half of the height of the sand chamber 10;
and (4) filling test. Because the geotextile 12 is a flexible material, the geotextile is not suitable for being filled and then assembled, a sample is filled in water, water is added while filling until the sample is filled in the sand chamber 10, the cover plate 16 is covered, and the geotextile is fastened by bolts;
adding water for the second time. Adding water into the device along the water outlet chamber 11, keeping the liquid level of the water outlet chamber 11 higher than the liquid level of the water level in the left water source tank 5, so that the water fully invades into the water source tank 5 under the action of self weight until the water source tank 5 is fully filled with the water, removing the redundant water in the water outlet chamber 11, making the water level of the water outlet chamber 11 higher than the water level in the water source tank 5, and fully soaking the sand sample for twenty-four hours under the condition;
the period and amplitude are set. According to a programmed program, defining the period and the energy of the water flow of the reciprocating variable water head required in a speed regulation controller;
the sensor is energized. Opening a power switch of the pore water pressure sensor 13 and the micro liquid level sensor 17, connecting the computer 18 with the acquisition card 19, controlling the sensors to work, and synchronously acquiring data;
the test is completed within a preset time, the collected data are analyzed and calculated to obtain hydraulic parameters such as sand coating permeability coefficient of the geotextile 12 in the test process, and the device can be disassembled to perform grading analysis on sandy soil in different areas in the sand chamber 10 to obtain the migration rule of the inside of the sandy soil under the action of the reciprocating variable water head.
Based on the above: the seepage mechanism of the sand-lined system of the geotextile 12 under the reciprocating variable water head is one of important subjects of the technology for perfecting the filled tube-bag dam, and particularly, the seepage mechanism of the sand-lined system of the geotextile 12 under the water flow conditions of waves, tides and the like needs to be perfected urgently in research, which is the basis of the seepage analysis of the tube-bag dam and has very important significance on the safety evaluation of a dam body. The utility model provides a reciprocating variable head gradient ratio permeameter, which aims to break through the limitation of the constant head of the traditional gradient ratio permeameter and the phenomenon of high construction cost of constructing a large wave pool or field test by changing, is applied to the gradient ratio permeameter test and is specially suitable for the gradient ratio permeameter test under the action of the reciprocating variable head: a driving program of a servo motor 1 is programmed, the motor rotates according to a certain period and angular speed, and the piston 4 is driven by a screw rod lifting machine 2 to make reciprocating linear motion with sine periodic change in the vertical direction, so that the water pressure also changes in sine periodic change, and under the action of pressure difference of the sine periodic change, water flow reciprocates in a water source box 5 and a gradient ratio permeameter, so that the scouring effect of a reciprocating water head on a sand-coated system of the geotextile 12 is simulated. The dynamic process can be customized by a user, and various sensors acquire information in real time so as to analyze the seepage mechanism and the sandy soil migration rule of the sand-coated system of the geotextile 12 under the action of the reciprocating variable water head.
It will be appreciated by those skilled in the art that the utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the utility model are intended to be embraced therein.
Claims (6)
1. A reciprocating variable water head gradient ratio permeameter is characterized by comprising a reciprocating variable water head water supply module and a gradient ratio permeameter module,
the reciprocating variable water head water supply module provides reciprocating variable water head water flow for the gradient ratio permeameter module;
the gradient ratio permeameter module is used for researching the seepage characteristics of the sand-lined system of the geotextile (12).
2. The reciprocating variable head gradient ratio permeameter according to claim 1, wherein the reciprocating variable head water supply module comprises a servo motor (1), a screw rod lifter (2), a synchronous lifting platform (3), a piston (4) and a water source box (5); servo motor (1) is located directly over lead screw lift (2) for drive lead screw lift (2) rotate, synchronous elevating platform (3) are attached to on lead screw lift (2), can realize going up and down along with the rotation of lead screw, piston (4) are through straight-bar (6) and synchronous elevating platform (3) fixed connection, piston (4) and water supply case (5) sliding connection, and the junction is sealed through sealed sealing up circle (7).
3. A reciprocating variable head gradient ratio permeameter according to claim 2, characterized in that the servo motor (1) is controlled by a speed regulator (8) and a computer (18) to rotate at a preset period and angular speed, and the piston (4) can make reciprocating linear motion with a sinusoidal periodic change in speed in the water source tank (5) through transmission.
4. The reciprocating variable head gradient ratio permeameter according to claim 3, wherein the gradient ratio permeameter module comprises: the sand-water separator comprises a water inlet chamber (9), a sand chamber (10) and a water outlet chamber (11), wherein the water inlet chamber (9) is communicated with a water source box (5) leftwards and is communicated with the sand chamber (10) rightwards, a geotextile (12) is clamped between the sand chamber (10) and the water inlet chamber (9), one side, close to the sand chamber (10), of the water inlet chamber (9) is provided with a pore water pressure sensor (13), the sand chamber (10) is communicated with the water outlet chamber (11) rightwards, a hole-containing base plate (14) is arranged between the sand chamber (10) and the water outlet chamber (11), the left side of the hole-containing base plate (14) is fixedly connected with a gauze (15), and three hole water pressure sensors (13) which are arranged at equal intervals are further arranged on one side, close to the water inlet chamber (9), of the sand chamber (10).
5. A reciprocating variable head gradient ratio permeameter according to claim 4, wherein the sand chamber (10) is provided with a hole for filling sand at the upper part, and a cover plate (16) is arranged on the hole.
6. The reciprocating variable head gradient ratio permeameter according to claim 4, wherein a liquid level sensor (17) is installed at the bottom of the water outlet chamber (11), the upper part of the water outlet chamber (11) is communicated with the atmosphere, the port of the computer (18) is further connected with an acquisition card (19), and the acquisition card (19) is used for acquiring and analyzing data of the pore water pressure sensor (13) and the micro liquid level sensor (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121606528.5U CN215866289U (en) | 2021-07-15 | 2021-07-15 | Reciprocating variable water head gradient ratio permeameter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121606528.5U CN215866289U (en) | 2021-07-15 | 2021-07-15 | Reciprocating variable water head gradient ratio permeameter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215866289U true CN215866289U (en) | 2022-02-18 |
Family
ID=80333856
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121606528.5U Active CN215866289U (en) | 2021-07-15 | 2021-07-15 | Reciprocating variable water head gradient ratio permeameter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215866289U (en) |
-
2021
- 2021-07-15 CN CN202121606528.5U patent/CN215866289U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109519156B (en) | Seepage experiment method for side water sandstone gas reservoir water drive profile model | |
| CN110553939B (en) | Indoor test platform for simulating marine multiphase load coupling effect | |
| CN110672497A (en) | Multifunctional infiltration piping tester | |
| CN108562526A (en) | The experimental rig and test method of study two-dimensional and three dimensional fluid flow-soil particle Erosion Law | |
| CN105672379B (en) | The excavation of foundation pit model test apparatus of dynamic artesian water effect | |
| CN106950153A (en) | Shaked out process simulation special reactor and its method of testing containing hydrate sediment | |
| CN107063632B (en) | Experimental method of river bed vertical subsurface flow exchange test device driven by periodic pulsating pressure | |
| CN109001098B (en) | Soil instantaneous permeability characteristic tester and soil permeability characteristic calculation method | |
| CN105675846B (en) | Phreatic table and the excavation of foundation pit model test apparatus of artesian head collaboration lifting | |
| CN104655494A (en) | Dynamic triaxial tester for analyzing dynamic characteristics of deepwater natural gas hydrate sediment | |
| CN113720994B (en) | Device and method for testing stability of excavation face of shield tunnel under spring condition | |
| CN208239264U (en) | It is a kind of for studying the experimental rig of soil particle Erosion Law | |
| CN115406738B (en) | Anti-blocking microorganism temperature control grouting reinforcement integrated triaxial test device | |
| CN112540038A (en) | Test device and method for testing coupling permeability characteristics of geotextile and sandy soil | |
| CN103926183A (en) | Testing method and device for water passing amount under normal pressure | |
| CN215866289U (en) | Reciprocating variable water head gradient ratio permeameter | |
| CN113884654B (en) | Simulation method for sandy soil spraying and desertification control slurry simulation device | |
| CN111006951A (en) | Indoor grouting test device and simulated grouting test method | |
| CN215297368U (en) | Experimental device for simulating coupling effect of seismic waves and rainfall to induce landslide | |
| CN113216286A (en) | Model test device for penetration of multi-barrel foundation and using method thereof | |
| CN108088651A (en) | Potential of Seabed Under Wave Loading dynamic response experimental facilities and analogue experiment method | |
| CN207730418U (en) | Potential of Seabed Under Wave Loading dynamic response experimental facilities | |
| CN216948460U (en) | Model test device for multi-barrel foundation penetration | |
| CN113758849B (en) | Crack simulation structure, crack dynamic water plugging test device and method thereof | |
| CN214251933U (en) | Two-dimensional plane seepage test device considering water and soil coupling flow |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |