CN109991159A - A kind of earth rock cofferdam bed course and geomembrane interfacial friction factor device for quick testing and method - Google Patents
A kind of earth rock cofferdam bed course and geomembrane interfacial friction factor device for quick testing and method Download PDFInfo
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- CN109991159A CN109991159A CN201910338705.7A CN201910338705A CN109991159A CN 109991159 A CN109991159 A CN 109991159A CN 201910338705 A CN201910338705 A CN 201910338705A CN 109991159 A CN109991159 A CN 109991159A
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- 238000012360 testing method Methods 0.000 title claims abstract description 42
- 239000011435 rock Substances 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 71
- 239000011241 protective layer Substances 0.000 claims abstract description 30
- 238000013461 design Methods 0.000 claims abstract description 17
- 239000010410 layer Substances 0.000 claims abstract description 13
- 230000002045 lasting effect Effects 0.000 claims abstract description 3
- 238000009434 installation Methods 0.000 claims description 14
- 239000012528 membrane Substances 0.000 claims description 10
- 230000015572 biosynthetic process Effects 0.000 claims description 8
- 239000002131 composite material Substances 0.000 claims description 6
- 238000011068 loading method Methods 0.000 claims description 6
- 238000012216 screening Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000013100 final test Methods 0.000 claims description 3
- 230000006641 stabilisation Effects 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 claims description 3
- 238000003556 assay Methods 0.000 claims 1
- 230000001360 synchronised effect Effects 0.000 claims 1
- 230000004888 barrier function Effects 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 238000010276 construction Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/02—Measuring coefficient of friction between materials
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Abstract
The present invention proposes a kind of earth rock cofferdam bed course interfacial friction factor device for quick testing and method, it is intended to which the quickly coefficient of friction between test cofferdam bedding material and geomembrane checks the reasonability of design phase coefficient of friction, it is ensured that impervious barrier is stablized.Described device includes including support plate, jack, bed course support frame, amesdial, protractor, baffle, bedding material, film top protective layer.The method is based on above-mentioned apparatus, and bedding material is arranged in the bed course support frame, and film top protective layer is arranged above padding layer, and geomembrane to be measured is arranged between bedding material and film top protective layer.Jack is slowly smoothly jacked, stops test when lasting variation occurs for amesdial and changing value reaches 1mm, reads protractor reading, as this is from steady angle of friction magnitude.
Description
Technical field
The present invention relates to a kind of earth rock cofferdam bed courses and geomembrane interfacial friction factor device for quick testing and method, mainly
The similar engineerings such as earth rock cofferdam, earth and rockfill dam, dyke and refuse landfill suitable for water power hydraulic engineering.
Background technique
Geomembrane is the waterproof isolation-type material using a kind of high molecular polymer as base stock, due to its good antiseepage
Performance, convenience for construction and economy obtain widespread adoption in China.Especially in China's hydraulic and hydroelectric engineering earth rock cofferdam item
It is generally used in mesh, cofferdam height and scale increase year by year in recent years, and high earth rock cofferdam technical difficulty is also with cofferdam scale
Increase and promoted, certain cofferdam using geomembrane anti-seepage lead to the case of geomembrane destruction repeatedly due to unreasonable structural design
Occur, wherein geomembrane and the coefficient of friction at cofferdam bed course interface determine the upstream gradient in Inclined wall formula cofferdam, are cofferdam designs
Important parameter, be related to the whole stress of geomembrane and the Against Sliding Stability of impervious body.In the past, bedding material and geotechnological membrane interface
Coefficient of friction is often carried out in laboratory using direct shear test in the concept phase, often because of live bedding material in later period implementation process
Gradation and geo-membrane material change and there are biggish differences with just the stage is set.
Summary of the invention
The present invention is directed to overcome the technical solution of the PVvalue testing of bedding material in the prior art and geotechnological membrane interface
In place of above shortcomings, a kind of earth rock cofferdam bed course interfacial friction factor device for quick testing and method are proposed, it is intended to fast
Coefficient of friction between speed test cofferdam bedding material and geomembrane, checks the reasonability of design phase coefficient of friction, it is ensured that impervious barrier
Stablize.
To achieve the above object, the invention adopts the following technical scheme:
A kind of earth rock cofferdam bed course and geomembrane interfacial friction factor device for quick testing of the invention, including including support
Plate, jack, bed course support frame, amesdial, protractor, baffle, bedding material, film top protective layer, bed course support frame one end
Bottom and support plate setting hinge are hinged, and jack is arranged between the other end and support plate of bed course support frame；Bed course support frame
Setting jack one end top surface amesdial is set, protractor is arranged in bed course support frame and the hinged one end of support plate；The pad
Layer support frame in be arranged bedding material, film top protective layer be arranged above padding layer, between bedding material and film top protective layer setting to
The geomembrane of survey.
Preferably, baffle is arranged in bed course support frame and the hinged one end top surface of support plate.
Preferably, the geomembrane is composite geo-membrane or Smooth-surface geomembrane.
Preferably, film top protective layer is using pneumatically placed concrete or precast slab or cast in place concrete plate.
Present invention simultaneously provides a kind of earth rock cofferdam bed course and geomembrane interfacial friction factor method for rapidly testing, the sides
Method the following steps are included:
Step 1, the combination with installation of test device: combining support plate, bed course support frame by hinge, and group will install
Device for quick testing is placed on horizontal, hard ground；
Step 2, bedding material is mated formation: according to by live material source situation, by bedding material screening, being weighed, it is ensured that bedding material gradation
Meet design requirement, manually careful to vibrate to design dry density by bedding material point two layers of loadings bed course support frame, top is with scraping
Plate strikes off；
Step 3, the installation of geomembrane: being cut to the rectangle with the same size of bed course support frame for geomembrane to be tested,
Bedding material surface is laid on by geomembrane is smooth；
Step 4, the setting of film top protective layer: laying mould top protective layer on geomembrane, and whole stand is greater than or equal to 30
Minute, it is contacted to geomembrane with bedding material and compresses stabilization；
Step 5, the installation of amesdial: the gauge stand of amesdial is fixed on bed course support frame, by the testing needle crown by protection
The upper edge of layer side adjusts the measuring staff axis of amesdial table perpendicular to protective layer side；
Step 6, the installation of jack: on the supporting plate by jack installation, jack withstands on bed course support frame far from hinge
The middle part of chain side bottom surface, adjusts bed course support frame and support plate initial tilt is 10~20 °, and guarantees two sides uniform force；
Step 7, the jacking of jack: jack is slowly smoothly jacked, and guarantees that jacking rate is less than or equal to 1 °/min,
Simultaneous observation amesdial stops test when lasting variation occurs for amesdial and changing value reaches 1mm, reads protractor reading,
As this is from steady angle of friction magnitude；
Step 8, multiple groups test and average value are sought: carrying out no less than 5 groups of examination of the same race to every kind of bedding material and geomembrane
It tests, using small value average value as final test result.
Preferably, the geomembrane is composite geo-membrane or Smooth-surface geomembrane.
Preferably, film top protective layer is using pneumatically placed concrete or precast slab or cast in place concrete plate.
Preferably, the step 2 further comprises
Step 21, waterproof film is laid in support frame before bedding material is mated formation；
Step 22, it according to by live material source situation, by bedding material screening, weighs, it is ensured that bedding material gradation meets design and wants
It asks, it is manually careful to vibrate to setting during bedding material filling plus water saturation by bedding material point two layers of loadings bed course support frame
Dry density is counted, top is struck off with scraper plate.
The beneficial effects of the present invention are: the present invention is that a kind of earth rock cofferdam bed course is quickly surveyed with geomembrane interfacial friction factor
Device and method is tried, for the similar work such as earth rock cofferdam, earth and rockfill dam, dyke and refuse landfill suitable for water power hydraulic engineering
The quick measurement of bedding material and geomembrane interfacial friction factor in journey, can directly measure practical bedding material used by practice of construction
And the coefficient of friction of geo-membrane material, Preliminary design achievement is checked, guarantees that geomembrane anti-seepage structure is safe and reliable.
Detailed description of the invention
Fig. 1 is a kind of earth rock cofferdam bed course and geomembrane interfacial friction factor device for quick testing of the embodiment of the present invention one
Structural schematic diagram.
In figure: support plate 1, jack 2, bed course support frame 3, amesdial 4, hinge 5, protractor 6, baffle 7, bedding material 8,
Geomembrane 9, film top protective layer 10.
Specific embodiment
The present invention is described further with reference to the accompanying drawings of the specification.
Embodiment one
It is quickly surveyed as shown in Figure 1, the embodiment of the present invention provides a kind of earth rock cofferdam bed course with geomembrane interfacial friction factor
Trial assembly is set, including including support plate 1, jack 2, bed course support frame 3, amesdial 4, protractor 6, baffle 7, bedding material 8, film top
Protective layer 10, it is hinged that 3 one end bottom of bed course support frame and support plate 1 are arranged hinge 5, the other end of bed course support frame 3 and
Jack 2 is set between support plate 1；Amesdial 4, bed course support frame is arranged in 2 one end top surface of setting jack of bed course support frame 3
3 and the hinged one end of support plate 1 protractor 6 is set；Bedding material 8 is set in the bed course support frame 3, and film top protective layer 10 is arranged
Above padding layer, geomembrane 9 to be measured is set between bedding material 8 and film top protective layer 10.
The support backing plate is formed using angle steel and 1.5cm thickness precast slab, is welded into 2.2m*1.2m* by angle steel
The precast slab of undersized is mated formation and is put into rectangle frame by the rectangle frame of 2cm specification, is provided for jack 2 smooth, firm
Basal plane.
Bed course support frame 3 is welded into the rectangle frame of 2.0m*1.0m*7cm specification using angle steel.Separately on the long and short side of rectangle frame
Middle part respectively uses 1 band steel 40mm*6mm (width * thickness) to be reinforced, and the 2cm solid wood of undersized is put into rectangle frame,
Smooth, firm bottom surface, which is provided, for bedding material 8 closes basal plane.
Baffle 7 is arranged in bed course support frame 3 and the hinged one end top surface of support plate 1.The geomembrane 9 is composite geo-membrane 9
Or Smooth-surface geomembrane 9.Film top protective layer 10 is rectangle using pneumatically placed concrete or precast slab or cast in place concrete plate, shape
Cube.
Embodiment two
The embodiment of the present invention provides a kind of earth rock cofferdam bed course and geomembrane interfacial friction factor method for rapidly testing, described
Method the following steps are included:
Step 1, it the combination with installation of test device: combines support plate 1, bed course support frame 3 by hinge 5, group will dress
In good device for quick testing placement and horizontal, hard ground.
Step 2, bedding material 8 is mated formation: according to by live material source situation, by the screening of bedding material 8, being weighed, it is ensured that 8 grades of bedding material
With design requirement is met, bedding material 8 is divided in two layers of loading bed course support frame 3, it is manually careful to vibrate to design dry density, top
It is struck off with scraper plate.
Step 3, geomembrane 9 to be tested the installation of geomembrane 9: is cut to the square with the same size of bed course support frame 3
Shape is laid on 8 surface of bedding material for geomembrane 9 is smooth.
Step 4, the setting of film top protective layer 10: laying mould top protective layer on geomembrane 9, and whole stand is greater than or equal to
It 30 minutes, is contacted to geomembrane 9 with bedding material 8 and compresses stabilization.
Specifically, film top protective layer 10 is using pneumatically placed concrete or precast slab or cast in place concrete plate, shape
For rectangular cubic.If need to be using pneumatically placed concrete or cast-in-place concrete Shi Zexu elsewhere first by geomembrane 9 and protective layer
Spray or after the completion of pouring it is prefabricated be integrated after on lifting to bed course support frame 3.
Step 5, the installation of amesdial 4: the gauge stand of amesdial 4 is fixed on bed course support frame 3, by the testing needle crown by protecting
The upper edge of sheath side adjusts the measuring staff axis of 4 table of amesdial perpendicular to protective layer side.
Step 6, the installation of jack 2: jack 2 is mounted in support plate 1, and it is remote that jack 2 withstands on bed course support frame 3
Middle part from 5 side bottom surface of hinge, adjusting bed course support frame 3 and 1 initial tilt of support plate is 10~20 °, and guarantee two sides by
Power is uniform.
Step 7, the jacking of jack 2: by the slowly smooth jacking of jack 2, guarantee jacking rate be less than or equal to 1 °/
Min, simultaneous observation amesdial 4 stop test when amesdial 4 occurs persistently to change and changing value reaches 1mm, read protractor
6 readings, as this is from steady angle of friction magnitude.
Step 8, multiple groups test and average value are sought: carrying out no less than 5 groups of the same race to every kind of bedding material 8 and geomembrane 9
Test, using small value average value as final test result.
The geomembrane 9 is composite geo-membrane 9 or Smooth-surface geomembrane 9.The support backing plate is thick pre- using angle steel and 1.5cm
Concrete slab composition processed, the rectangle frame of 2.2m*1.2m*2cm specification is welded by angle steel, by the precast slab of undersized
Mat formation and be put into rectangle frame, provides smooth, firm basal plane for jack 2.
Bed course support frame 3 is welded into the rectangle frame of 2.0m*1.0m*7cm specification using angle steel.Separately on the long and short side of rectangle frame
Middle part respectively uses 1 band steel 40mm*6mm (width * thickness) to be reinforced, and the 2cm solid wood of undersized is put into rectangle frame,
Smooth, firm bottom surface, which is provided, for bedding material 8 closes basal plane.
The embodiment of the present invention is a kind of earth rock cofferdam bed course and 9 interfacial friction factor method for rapidly testing of geomembrane, is used for
Bedding material 8 and geotechnique in the similar engineerings such as earth rock cofferdam, earth and rockfill dam, dyke and refuse landfill water power hydraulic engineering
The quick measurement of 9 interfacial friction factor of film can directly measure 9 material of practical bedding material 8 and geomembrane used by practice of construction
Coefficient of friction, check Preliminary design achievement, guarantee 9 leakage preventing structure of geomembrane it is safe and reliable.
Embodiment three
The present embodiment is a kind of earth rock cofferdam bed course and geomembrane provided embodiment one as a preferred solution
Interfacial friction factor method for rapidly testing advanced optimizes improvement, and step 2 described in the present embodiment further comprises
Step 21, waterproof film is laid in support frame before bedding material 8 is mated formation；
Step 22, it according to by live material source situation, by the screening of bedding material 8, weighs, it is ensured that 8 gradation of bedding material meets design
It is required that bedding material 8 is divided in two layers of loading bed course support frame 3, water saturation, artificial careful vibration are added during bedding material 8 loads
It smashes to design dry density, top is struck off with scraper plate.
The scheme of the present embodiment can test the interfacial friction factor of saturation state underlay layered material 8 Yu geomembrane 9.
Claims (8)
1. a kind of earth rock cofferdam bed course and geomembrane interfacial friction factor device for quick testing, characterized in that including including support
Plate, jack, bed course support frame, amesdial, protractor, baffle, bedding material, film top protective layer, bed course support frame one end
Bottom and support plate setting hinge are hinged, and jack is arranged between the other end and support plate of bed course support frame；Bed course support frame
Setting jack one end top surface amesdial is set, protractor is arranged in bed course support frame and the hinged one end of support plate；The pad
Layer support frame in be arranged bedding material, film top protective layer be arranged above padding layer, between bedding material and film top protective layer setting to
The geomembrane of survey.
2. a kind of earth rock cofferdam bed course according to claim 1 and geomembrane interfacial friction factor device for quick testing,
It is characterized in, baffle is arranged in bed course support frame and the hinged one end top surface of support plate.
3. a kind of earth rock cofferdam bed course according to claim 1 and geomembrane interfacial friction factor device for quick testing,
It is characterized in, the geomembrane is composite geo-membrane or Smooth-surface geomembrane.
4. a kind of earth rock cofferdam bed course according to claim 1 and geomembrane interfacial friction factor device for quick testing,
It is characterized in, film top protective layer is using pneumatically placed concrete or precast slab or cast in place concrete plate.
5. a kind of earth rock cofferdam bed course and geomembrane interfacial friction factor method for rapidly testing, characterized in that the method includes
Following steps:
Step 1, it the combination with installation of test device: combines support plate, bed course support frame by hinge, group is quick by what is installed
Test device is placed on horizontal, hard ground；
Step 2, bedding material is mated formation: according to by live material source situation, by bedding material screening, being weighed, it is ensured that bedding material gradation meets
Design requirement, by two layers of loading bed course support frame of bedding material point, manually careful to vibrate to design dry density, top is scraped with scraper plate
It is flat；
Step 3, the installation of geomembrane: being cut to the rectangle with the same size of bed course support frame for geomembrane to be tested, will be native
Work film is smooth to be laid on bedding material surface；
Step 4, the setting of film top protective layer: laying mould top protective layer on geomembrane, and whole stand is greater than or equal to 30 minutes,
It is contacted to geomembrane with bedding material and compresses stabilization；
Step 5, the installation of amesdial: the gauge stand of amesdial is fixed on bed course support frame, and protective layer side is leaned on the testing needle crown
The upper edge in face adjusts the measuring staff axis of amesdial table perpendicular to protective layer side；
Step 6, the installation of jack: on the supporting plate by jack installation, jack withstands on bed course support frame far from hinge one
The middle part of side bottom surface, adjusts bed course support frame and support plate initial tilt is 10~20 °, and guarantees two sides uniform force；
Step 7, the jacking of jack: jack is slowly smoothly jacked, and guarantees that jacking rate is less than or equal to 1 °/min, synchronous
Amesdial is observed, stops test when lasting variation occurs for amesdial and changing value reaches 1mm, reads protractor reading, as
This is from steady angle of friction magnitude；
Step 8, multiple groups test and average value are sought: being carried out no less than 5 groups of Homogeneous assay to every kind of bedding material and geomembrane, adopted
Use small value average value as final test result.
6. a kind of earth rock cofferdam bed course according to claim 5 and geomembrane interfacial friction factor method for rapidly testing,
It is characterized in, the geomembrane is composite geo-membrane or Smooth-surface geomembrane.
7. a kind of earth rock cofferdam bed course according to claim 5 and geomembrane interfacial friction factor method for rapidly testing,
It is characterized in, film top protective layer is using pneumatically placed concrete or precast slab or cast in place concrete plate.
8. a kind of earth rock cofferdam bed course according to claim 5 and geomembrane interfacial friction factor method for rapidly testing,
It is characterized in, the step 2 further comprises
Step 21, waterproof film is laid in support frame before bedding material is mated formation；
Step 22, it according to by live material source situation, by bedding material screening, weighs, it is ensured that bedding material gradation meets design requirement, will
Bedding material divides in two layers of loading bed course support frame, and during bedding material filling plus water saturation, artificial careful vibrate to design are done
Density, top are struck off with scraper plate.
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Cited By (3)
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| CN110470593A (en) * | 2019-08-31 | 2019-11-19 | 四川大学 | For quickly measuring the experimental rig and method of structural plane model material friction coefficient |
| CN110567871A (en) * | 2019-07-23 | 2019-12-13 | 西南交通大学 | Friction experiment device, bearing mechanism, loading mechanism and friction experiment method thereof |
| CN113686967A (en) * | 2021-09-03 | 2021-11-23 | 中国电建集团华东勘测设计研究院有限公司 | Method for reducing influence of boundary reflection effect on stress wave propagation test data |
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