CN1484013A - Instrment for testing geotextile permeability and silting property - Google Patents
Instrment for testing geotextile permeability and silting property Download PDFInfo
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- CN1484013A CN1484013A CNA031317049A CN03131704A CN1484013A CN 1484013 A CN1484013 A CN 1484013A CN A031317049 A CNA031317049 A CN A031317049A CN 03131704 A CN03131704 A CN 03131704A CN 1484013 A CN1484013 A CN 1484013A
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- geotextile
- silting
- delivering orifice
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- inner core
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Abstract
The invention refers to an apparatus to test permeability coefficient and silting character of the geotextiles. It sets inner and outer tubes in penetrating container, forming flow-measuring region in the inner tube and outboard balance region between two tubes, and left and right water exits connected with the flow-measuring and outboard balance regions, respectively. It only uses seepage-measuring results in the middle part to calculate the permeability coefficient, overcoming the border effect, simulates practical force state of the geotextiles, and also can calculate the magnitude of seepage by determining the outboard and middle seepage at the same time.
Description
Technical field
The present invention relates to a kind of testing tool, the particularly a kind of infiltration coefficient of geotextile and instrument of silting characteristic tested.
Background technology
At present, because geotextile has stronger tensile strength, can effectively prevent to permeate seepage deformation with the seepage flow overflow area, wherein can set more accurately with the aperture and the pitch-row of the perverse nonweaven geotextile of pin especially, infiltration coefficient can be controlled preferably and be used as anti-filtering material and be widely used in different engineerings with the water proof material.But in concrete engineering is used, the perverse nonweaven geotextile of pin need bear the pressure of overlying strata soil, and its thickness can great changes will take place, and aperture and infiltration coefficient also can be along with great changes will take place, therefore must there be the infiltration coefficient under the press strip spare to measure to this fabric, to adapt to engineering construction.In addition, because the fibers material in this fabric has adsorbability to clay particle, so when in clay, using this fabric, must measure its silting characteristic as anti-filtering material.
Before the present invention makes, measure infiltration coefficient and the instrument of silting characteristic such as the instrument that permeameter combines with consolidometer of above-mentioned fabrics, but this instrument is being surveyed in the osmotic coefficient investigating process fabric, lateral leakage can take place in fabric in vertical flow event, and the ratio of side direction seepage flow and vertical seepage flow can increase along with the increase of normal stress, can reach 3%～5%, have a strong impact on the mensuration degree of accuracy, simultaneously in the mensuration process, in order to reduce the lateral leakage amount, just examination tube in both sides is tightened with bigger pressure up and down, and this causes the fabric thickness attenuation at clamped position all around, form protuberance in both sides, sample middle part, the degree of protuberance increases because of fabric layers and the increase of tightening pressure, thereby make fabric make the time spent unbalance stress at low normal stress, streamline is not parallel straight line, causes the reliability of test determination not high.And for example another kind of improved permeameter, the effect by rubber washer under less pressure of this instrument makes the sample fabric keep horizontal substantially, carry out vertical permeability test then, but this is feasible in theory, and in actual applications, because the error of circular geotextile sample preparation, be easy to generate concentrated seepage at the permeameter inwall position that contacts with fabric, make that the infiltration coefficient that records is bigger than normal, inaccurate, unreliable, and this instrument can not apply pressure at right angle, can't the actual forced status of simulate fabric when work.
Summary of the invention
Purpose of the present invention just is to overcome above-mentioned defective, designs a kind of infiltration coefficient of accurate mensuration geotextile and the tester of silting characteristic.
Technical scheme of the present invention is: geotextile infiltration and silting characteristic tester, the end, be provided with porous disc, following porous disc in the permeability vessel, in the middle of the permeability vessel is transmission rod, be inverted T shape, cavity in following porous disc bottom is communicated with left water delivering orifice, its major technique is characterised in that in permeability vessel and on the transmission rod base plane inner core is set, the straight bar part of transmission rod is in inner core, in inner core, form the flow measuring district, form outside equilibrium area between inner core and urceolus, right water delivering orifice is communicated with outside equilibrium area.
Advantage of the present invention and effect are to be provided with inner core, urceolus, form flow measuring district and outside equilibrium area, only use the seepage flow measurement calculation permeability coefficient of middle part, have overcome boundary effect such as phenomenons such as lateral leakage, protuberance; The flow direction that guarantees the infiltration current is parallel perpendicular to geotextile and streamline, can apply different pressure at right angles to the test fabric, the actual forced status the during work of simulation geotextile; Vertical pressure on the whole discharge area of fabric is uniformly, and the lateral leakage around the sample fabric is smaller, but also the amount of mensuration is calculated the seepage size can be by the outside and middle seepage flow the time.The present invention is simple in structure, easy to operate.
Description of drawings
Fig. 1-structural principle synoptic diagram of the present invention.
Embodiment
As shown in Figure 1, both sides, upper end at the urceolus 10 of permeability vessel are respectively water inlet 1, gap 2, its inner bottom part is following porous disc 6, be to go up porous disc 7 on it, it on the porous disc 7 transmission rod 8, be the font of falling T, on the plane of the font of falling T of transmission rod 8 inner core 9 be set, the bar part of transmission rod 8 is in inner core 9; Because the existence of inner core 9, urceolus 10 forms flow measuring district A in the inner core 9 of permeability vessel, form outside equilibrium area B between inner core 9 and the urceolus 10; Remain flow amount lateral areas A in the following center section lower space of porous disc 6, have left water delivering orifice 3 to be communicated with it, equilibrium area B outside remaining corresponding to the less space of following porous disc 6 bottoms of outside equilibrium area B has right water delivering orifice 4 to be communicated with it; It is that end highly can be regulated that left side water delivering orifice 3, right water delivering orifice 4 are connected to the outer part of permeability vessel.
When measuring geotextile especially during the infiltration coefficient of the perverse nonweaven geotextile of pin, still as shown in Figure 1, earlier by left water delivering orifice 3, right water delivering orifice 4 water-filling in permeability vessel, be higher than down porous disc 6 to water level, tested fabric 5 is placed down on the porous disc 6, urceolus 10 is installed, inner core 9, rubber washer 11 is in the bottom of urceolus 10, form sealing, increased pressure frame is placed on the transmission rod 8, this increased pressure frame is the prior art usual means, also is provided with dial gauge on it and can reads stressed data, applies lateral pressure to tested fabric 5, again by water inlet 1 water-filling in permeability vessel, regulate left water delivering orifice 3 simultaneously, the terminal height of right water delivering orifice 4, highly identical to the two, gap 2 has water to overflow all the time when forming steady seepage with assurance; At this moment, measure the seepage flow of flow measuring district A and outside equilibrium area B, the area of flow measuring district A and outside equilibrium area B is suitable, calculates the infiltration coefficient of tested fabric 5 with the seepage flow of flow measuring district A.
When measuring the silting characteristic of the perverse geotextile of pin, preceding step is identical, just in permeability vessel, inject suspension by water inlet 1, this suspension is mixed with soil or cement by a certain percentage, the end of regulating left water delivering orifice 3, right water delivering orifice 4 simultaneously is highly identical, must guarantee that gap 2 has suspension to overflow when forming steady seepage; After certain hour is carried out in steady seepage, stop infiltration, take out and place baking oven to dry in tested fabric 5, measure the quality of the tested fabric 5 after drying, calculate the silting thing content in the tested fabric 5, carry out the silting characteristic and judge.
Claims (4)
1. geotextile permeates and the silting characteristic tester, the end, be provided with porous disc, following porous disc in the permeability vessel, in the middle of the permeability vessel is transmission rod, be inverted T shape, the cavity in following porous disc bottom is communicated with left water delivering orifice, it is characterized in that being provided with on the transmission rod base plane in permeability vessel inner core, the straight bar part of transmission rod is in inner core, form the flow measuring district in inner core, form outside equilibrium area between inner core and urceolus, right water delivering orifice is communicated with outside equilibrium area.
2. geotextile infiltration according to claim 1 and silting characteristic tester is characterized in that outside equilibrium area is communicated with right water delivering orifice by last porous disc, following porous disc.
3. geotextile infiltration according to claim 1 and 2 and silting characteristic tester is characterized in that left water delivering orifice, right water delivering orifice extend to outside the permeability vessel, and its end is Height Adjustable.
4. geotextile infiltration according to claim 1 and silting characteristic tester is characterized in that the flow measuring district is identical with the area of outside equilibrium area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031317049A CN1484013A (en) | 2003-07-22 | 2003-07-22 | Instrment for testing geotextile permeability and silting property |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031317049A CN1484013A (en) | 2003-07-22 | 2003-07-22 | Instrment for testing geotextile permeability and silting property |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1484013A true CN1484013A (en) | 2004-03-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA031317049A Pending CN1484013A (en) | 2003-07-22 | 2003-07-22 | Instrment for testing geotextile permeability and silting property |
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| CN (1) | CN1484013A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1306261C (en) * | 2005-02-25 | 2007-03-21 | 天津工业大学 | Method for testing external permeability of fibre fabre surface |
| CN103926183A (en) * | 2014-04-17 | 2014-07-16 | 中铁第四勘察设计院集团有限公司 | Testing method and device for water passing amount under normal pressure |
| CN104132877A (en) * | 2014-07-16 | 2014-11-05 | 东华大学 | Apparatus for detecting filtering performance of geotextile, and method thereof |
| CN104880398A (en) * | 2015-06-10 | 2015-09-02 | 中国科学院武汉岩土力学研究所 | Test device for clogging characteristic of geotechnical synthetic material |
| CN106644835A (en) * | 2016-12-08 | 2017-05-10 | 同济大学 | Determining device and method of chloride ion vertical diffusion coefficient under different hydraulic gradients |
| WO2019042407A1 (en) * | 2017-09-01 | 2019-03-07 | 王美兰 | Test equipment |
| CN109900611A (en) * | 2017-12-11 | 2019-06-18 | 中国科学院大连化学物理研究所 | A kind of porous material fixture measuring gas-premeable |
| CN110441210A (en) * | 2019-08-15 | 2019-11-12 | 苏州文帆纺织有限公司 | Fabric waterproof detection device |
| CN111855525A (en) * | 2020-06-30 | 2020-10-30 | 同济大学 | Device and method for detecting seepage-proofing performance of granular material |
-
2003
- 2003-07-22 CN CNA031317049A patent/CN1484013A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1306261C (en) * | 2005-02-25 | 2007-03-21 | 天津工业大学 | Method for testing external permeability of fibre fabre surface |
| CN103926183A (en) * | 2014-04-17 | 2014-07-16 | 中铁第四勘察设计院集团有限公司 | Testing method and device for water passing amount under normal pressure |
| CN104132877B (en) * | 2014-07-16 | 2017-01-18 | 东华大学 | Apparatus for detecting filtering performance of geotextile, and method thereof |
| CN104132877A (en) * | 2014-07-16 | 2014-11-05 | 东华大学 | Apparatus for detecting filtering performance of geotextile, and method thereof |
| CN104880398B (en) * | 2015-06-10 | 2018-04-06 | 中国科学院武汉岩土力学研究所 | A kind of geosynthetics silting characteristic test device |
| CN104880398A (en) * | 2015-06-10 | 2015-09-02 | 中国科学院武汉岩土力学研究所 | Test device for clogging characteristic of geotechnical synthetic material |
| CN106644835A (en) * | 2016-12-08 | 2017-05-10 | 同济大学 | Determining device and method of chloride ion vertical diffusion coefficient under different hydraulic gradients |
| CN106644835B (en) * | 2016-12-08 | 2019-10-18 | 同济大学 | The measurement device and method of chloride ion vertical proliferation coefficient under different hydraulic gradients |
| WO2019042407A1 (en) * | 2017-09-01 | 2019-03-07 | 王美兰 | Test equipment |
| CN109900611A (en) * | 2017-12-11 | 2019-06-18 | 中国科学院大连化学物理研究所 | A kind of porous material fixture measuring gas-premeable |
| CN110441210A (en) * | 2019-08-15 | 2019-11-12 | 苏州文帆纺织有限公司 | Fabric waterproof detection device |
| CN111855525A (en) * | 2020-06-30 | 2020-10-30 | 同济大学 | Device and method for detecting seepage-proofing performance of granular material |
| CN111855525B (en) * | 2020-06-30 | 2021-12-07 | 同济大学 | Device and method for detecting seepage-proofing performance of granular material |
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