CN114414455A - Seepage test device and method for simulating granite binary structure slope - Google Patents
Seepage test device and method for simulating granite binary structure slope Download PDFInfo
- Publication number
- CN114414455A CN114414455A CN202210046548.4A CN202210046548A CN114414455A CN 114414455 A CN114414455 A CN 114414455A CN 202210046548 A CN202210046548 A CN 202210046548A CN 114414455 A CN114414455 A CN 114414455A
- Authority
- CN
- China
- Prior art keywords
- test
- water
- soil
- granite
- seepage
- 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.)
- Granted
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 145
- 239000010438 granite Substances 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 121
- 239000002689 soil Substances 0.000 claims abstract description 105
- 239000011435 rock Substances 0.000 claims abstract description 35
- 239000004927 clay Substances 0.000 claims abstract description 29
- 230000002776 aggregation Effects 0.000 claims abstract description 15
- 238000004220 aggregation Methods 0.000 claims abstract description 14
- 230000005012 migration Effects 0.000 claims abstract description 13
- 238000013508 migration Methods 0.000 claims abstract description 13
- 238000005192 partition Methods 0.000 claims abstract description 10
- 238000010998 test method Methods 0.000 claims abstract description 4
- 230000008569 process Effects 0.000 claims description 18
- 239000011148 porous material Substances 0.000 claims description 17
- 239000002245 particle Substances 0.000 claims description 15
- 238000012544 monitoring process Methods 0.000 claims description 14
- 239000000700 radioactive tracer Substances 0.000 claims description 13
- 239000010419 fine particle Substances 0.000 claims description 11
- 238000009826 distribution Methods 0.000 claims description 8
- 239000004568 cement Substances 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 239000011521 glass Substances 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 238000004088 simulation Methods 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 28
- 238000005054 agglomeration Methods 0.000 description 3
- 230000003628 erosive effect Effects 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/0806—Details, e.g. sample holders, mounting samples for testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/23—Dune restoration or creation; Cliff stabilisation
Landscapes
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Biochemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Dispersion Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Fluid Mechanics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention relates to a seepage test device and a test method for simulating a granite binary structure side slope, which comprises a test soil tank, wherein a middle partition plate for dividing the inner space of the test soil tank into two test areas is arranged in the middle of the test soil tank; one bottom is a cement-poured broken line type foundation rock face, the other bottom is a cement-poured step type foundation rock face, the broken line type foundation rock face and the step type foundation rock face are both provided with slopes and form an inverted V-shaped structure; granite weathered soil is filled above the bedrock surfaces in the two test areas, and a buffer layer is laid on the upper surface of the granite weathered soil; the upper parts of the side walls of the two test areas are respectively provided with a plurality of water inlets, the lower parts of the side walls of the two test areas are respectively provided with a water outlet at the lower part of the bedrock surface, and the side walls of the two test areas in the region where the granite weathered soil is located are provided with a plurality of pressure measuring holes. The method has the advantages of simple principle, convenient operation and strong applicability, and can visually compare the influence of the base-cover interfaces with different forms on the clay migration and aggregation characteristics of the side slope with the granite binary structure.
Description
Technical Field
The invention relates to the field of geotechnical engineering seepage tests, in particular to a seepage test device for simulating a granite binary structure slope.
Background
The side slope with the granite binary structure is formed by an upper weathered soil body (comprising a residual layer, a fully weathered layer or a sandy soil-shaped strongly weathered layer) and a lower weathered rock body (a broken block-shaped strongly weathered layer or a weakly weathered layer) together, and is characterized in that the upper part and the lower part of the side slope have obvious differential weathering to form a discontinuous surface with abrupt permeability change and side slope stability control. A large number of engineering practices show that under the condition of the same geotechnical properties, the binary structure side slope is usually much lower in stability than a similar soil side slope with the same height, and becomes a side slope type which is easy to damage in engineering.
The granite weathered soil is a loose porous medium which is easy to disintegrate and water-saturated to soften. Under the action of seepage, fine particles in granite weathered soil generate migration motion on a coarse-particle soil overhead structure or a residual structural surface of a large pore space and migrate to a lower bedrock surface, because the upper soil body and the lower rock body show severe weathering transition and obvious difference of rock-soil water permeability, the movement speed of the fine particles is reduced, and the fine particles are gathered to form a low-strength mud film or a high-viscosity layer depending on a base-covering interface (namely a contact surface of the upper weathered soil and the lower bedrock), so that the permeability of the base-covering interface is reduced to form a temporary stagnant water surface, the granite weathered soil plays roles of a filler and a lubricant in the slope creeping process and becomes a weak interlayer which has important control on slope stability. Research shows that in the internal erosion process of granite weathering soil, the water-rock interaction near the basal coating interface is very active, which often leads to the softening of the basal coating interface strength due to the aggregation of clay grains, and further induces slope deformation and damage.
In the side slope exploration process, due to the fact that clay grains of a base-cover interface are high in aggregation concealment and difficult to find, sensitivity of the clay grains is neglected in design, and understanding of a side slope instability mechanism and correct evaluation of stability are further affected. Therefore, systematic and deep research on clay migration and aggregation characteristics of the granite binary structure slope is very necessary.
Disclosure of Invention
In view of the above, the invention aims to provide a seepage test device for simulating a granite binary structure side slope, which has a simple principle, is convenient to operate and has strong applicability, and can simulate the process of clay agglomeration at the top of a bed rock surface in an actual working condition and visually influence the migration and agglomeration characteristics of clay on the granite binary structure side slope compared with different forms of bed-covered interfaces.
The invention is realized by adopting the following scheme: a seepage test device for simulating a granite binary structure side slope comprises a test soil tank with an open top, wherein a middle partition plate for dividing the inner space of the test soil tank into two test areas is arranged in the middle of the test soil tank; the bottom in one test zone is a cement-poured broken line type foundation rock surface, the bottom in the other test zone is a cement-poured step type foundation rock surface, the broken line type foundation rock surface and the step type foundation rock surface are both provided with slopes and form an inverted V-shaped structure; granite weathered soil is filled above the bedrock surfaces in the two test areas, and a buffer layer is laid on the upper surface of the granite weathered soil; the upper parts of the side walls of the two test areas are respectively provided with a plurality of water inlets, the lower parts of the side walls of the two test areas are respectively provided with a water outlet at the lower part of the bedrock surface, and the side walls of the two test areas in the region where the granite weathered soil is located are provided with a plurality of pressure measuring holes.
Further, the device also comprises a camera and a nuclide identifier which are positioned on the front side of the test soil tank; the pressure measuring holes in the side wall of the test area are arranged at intervals along the vertical direction, pore water pressure gauges are installed on the pressure measuring holes, and the pore water pressure gauges are electrically connected with a data acquisition instrument; and a water collection tank below the water outlet, wherein a turbidity meter is arranged on the water collection tank.
Furthermore, the water inlets on the side wall of the test area are arranged at intervals along the vertical direction, and the water inlets are provided with control water valves.
Further, the test soil tank is of a cuboid structure and made of transparent organic glass, and a steel frame base is arranged below the test soil tank; the water outlet is provided with a water outlet porous plate, and the water outlet porous plate is provided with a water outlet hole with the aperture of 1 mm.
Furthermore, intermediate bottom comprises the water permeable sheet on upper portion and the water-stop sheet of lower part, sets up a plurality of diameters on the water permeable sheet and be 2 mm's the hole of permeating water, and the buffer layer height is not higher than the hole height of permeating water of the position minimum on the water permeable sheet.
The other technical scheme of the invention is as follows: a seepage test method for simulating a granite binary structure side slope adopts the seepage test device for simulating the granite binary structure side slope, and comprises the following steps:
(1) installing a seepage test device according to test requirements and a test site, and pouring inclined bedrock surfaces with different forms in a test area by using cement according to the test requirements;
(2) the clay particles in the sieved granite weathered soil are doped with 137Cs nuclide tracer, and fully stirred and mixed; preparing test soil samples required by the test according to the original grain composition of the weathered soil, filling the test soil samples into a test area of a test soil tank layer by layer according to a certain compactness, paving a layer of coarse-grained soil with a thickness on the top surface of granite weathered soil as a buffer layer, and enabling the whole height (namely the height of a bedrock, the height of a weathered soil layer and the height of the buffer layer) after filling to be lower than the height of a water permeable hole with the lowest position on a middle partition plate;
(3) installing a pore water pressure gauge on a pressure measuring hole, starting and testing the working state of each measuring instrument, adjusting the shooting range of a camera, and acquiring the content and the spatial distribution state of 137Cs nuclide tracer before testing by using a nuclide identification instrument;
(4) opening the control water valve of the lowest water inlet, closing the other control water valves, injecting seepage water, and starting a seepage test;
(5) in the test process, the pore water pressure meter reading collected by the data collector is utilized; utilizing a camera to shoot and collect the migration and aggregation processes of fine particles in the test soil tank at regular time; recording the accumulated water yield of the water collection tank at each time interval; monitoring and recording the concentration of the clay particles in the lost water body at each time interval by using a turbidity meter; monitoring the content and the spatial distribution form of the 137Cs tracer in the test soil tank by using a nuclide identifier;
(6) after seepage is stable, clay particles in the soil body do not move any more, all monitoring data have no obvious fluctuation, the current control water valve is closed, the control water valve of the last water inlet is opened, the height of the seepage head is increased, a seepage test is continued, and the change of all data is monitored by using a measuring system;
(7) and when the water is lifted to the highest water head to achieve seepage stability or a large amount of fine particles of the test soil sample are lost under a certain hydraulic gradient to form an obviously through seepage channel or gather on a base-covering interface to form a weak thin layer, finishing the seepage test.
Compared with the prior art, the invention has the following beneficial effects: the seepage test device for simulating the granite binary structure side slope is simple in principle, convenient to operate and strong in applicability, can simulate the process that clay aggregates on the top of a bed rock surface in an actual working condition, can visually compare the influence of different forms of bed-covered interfaces on the migration and aggregation characteristics of the clay of the granite binary structure side slope, and is mainly applied to research on the migration-aggregation evolution law of the clay in the granite binary structure side slope and the internal erosion mechanism of granite weathering soil.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to specific embodiments and accompanying drawings.
Drawings
FIG. 1 is a front cross-sectional view of a test soil box according to an embodiment of the present invention;
FIG. 2 is a top view of the overall structure of an embodiment of the present invention;
FIG. 3 is a side cross-sectional view of a test soil box of an embodiment of the present invention;
FIG. 4 is a schematic view of an intermediate partition in an embodiment of the present invention;
FIG. 5 is a schematic view of a water outlet perforated plate according to an embodiment of the present invention;
the reference numbers in the figures illustrate: 1-water inlet, 2-control water valve, 3-middle partition plate, 4-buffer layer, 5-test soil tank, 6-pressure measuring hole, 7-granite weathered soil, 8-broken line type basement rock surface, 9-water outlet porous plate, 10-water outlet, 11-water collecting tank, 12-steel frame base, 13-pore water pressure gauge, 14-data acquisition instrument, 15-step type basement rock surface, 16-turbidimeter, 17-camera, 18-nuclide identification instrument, 19-water permeable plate, 20-water outlet hole, 21-water-stop plate and 22-water permeable hole.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As shown in fig. 1 to 5, the seepage test device for simulating the granite binary structure side slope comprises a test soil tank 5 with an open top, wherein the top of the test soil tank is open so as to facilitate filling of a test soil sample, and a middle partition plate 3 for dividing the inner space of the test soil tank 5 into two test areas is arranged in the middle of the test soil tank 5; the bottom in one test zone is a cement-poured broken line type foundation rock face 8, the bottom in the other test zone is a cement-poured step type foundation rock face 15, both the broken line type foundation rock face 8 and the step type foundation rock face 15 are provided with slopes, and the broken line type foundation rock face 8 and the step type foundation rock face 15 form an inverted V-shaped structure; granite weathered soil 7 is filled above the bedrock surfaces in the two test areas, and a buffer layer 4 is laid on the upper surface of the granite weathered soil 7; the upper parts of the side walls of the two test areas are respectively provided with a plurality of water inlets 1, the lower parts of the side walls of the two test areas are respectively provided with a water outlet 10 at the lower part of the bedrock surface, and the side walls of the two test areas in the region where the granite weathered soil is located are provided with a plurality of pressure measuring holes 6; the upper parts of the left test area and the right test area are filled with granite weathered soil, and the lower parts of the left test area and the right test area are provided with inclined basement rock surfaces poured with cement, so that the structural characteristics of a typical granite binary structure side slope are simulated.
In the embodiment, the device also comprises a camera 17 and a nuclide identifier 18 which are positioned at the front side of the test soil tank 5; the pressure measuring holes in the side wall of the test area are arranged at intervals along the vertical direction, pore water pressure meters 13 are installed on the pressure measuring holes, and the pore water pressure meters are electrically connected with a data acquisition instrument 14; a water collecting tank below the water outlet, wherein a turbidity meter 16 is arranged on the water collecting tank; the experimental soil tank is divided into two test areas with the same size by a middle partition plate, the bottoms of the two test areas are provided with inclined basement rock surfaces with different forms, granite weathered soil is filled on the basement rock surfaces, a camera, a nuclide identification instrument and a turbidity meter are utilized to monitor the migration and aggregation development process of clay grains in the experimental soil tank, and then the influence of different forms of foundation covering interfaces on the migration and aggregation of the clay grains in the granite weathered soil under the seepage action is contrastively analyzed. The method has the advantages of simple principle, convenient operation and strong applicability, and is mainly applied to researching the migration-aggregation evolution law of clay particles in the granite binary structure slope and the internal erosion mechanism of the granite weathering soil; the pore water pressure gauge is arranged on a pressure measuring hole on the back of the test soil tank and used for monitoring the pore water pressure of the soil body in the seepage process; the data acquisition instrument is used for acquiring monitoring data of each pore water pressure gauge; the water collecting tank is used for collecting the effluent water body and fine particles; the turbidity meter is used for monitoring the turbidity of the water body in the water collection tank and representing the concentration of the lost fine particles; the camera is arranged on the front side of the seepage soil column model and is used for shooting and recording the whole-process image of the seepage soil body; the nuclide identification instrument is used for monitoring the content and the spatial distribution of 137Cs tracer agents in soil.
In this embodiment, the water inlet on the experimental region lateral wall is along vertical interval arrangement, and control water valve 2 is installed to water inlet department for control seepage head's height.
In this embodiment, the buffer layer is a layer of coarse-grained soil and is used for dispersing the pressure of water flow and reducing the direct impact of water flow on weathered soil.
In the embodiment, the test soil tank 5 is of a cuboid structure and made of transparent organic glass, a steel frame base 12 is arranged below the test soil tank and is used for supporting the whole test soil tank; the delivery port is a drainage seam of 2cm, and delivery port department is provided with water outlet porous plate 9, has laid apopore 20 that the aperture is 1mm on the water outlet porous plate for prevent the coarse grain in the soil body and run off and guarantee simultaneously that the water that the seepage flows out can in time be drained away.
In this embodiment, intermediate bottom is the organic glass board, and intermediate bottom comprises the pervious plate 19 on upper portion and the water-stop sheet 21 of lower part, has seted up a plurality of diameters on the pervious plate and is 2 mm's the hole 22 that permeates water, and the buffer layer height is not higher than the hole height that permeates water of the lowest position on the pervious plate, and intermediate bottom upper portion is pervious, the lower part is waterproof, guarantees that the infiltration head in left and right sides test area keeps same height and prevents that the test soil sample from taking place the loss of crossing the test area.
The length of the test soil tank in the embodiment is 1000mm, the width is 400mm, the height is 2000mm, and the wall thickness is 5 mm; respectively pouring broken line type foundation rock faces 8 and step type foundation rock faces 15 at the bottoms of the two test areas, wherein the inclination angles of the two groups of foundation rock faces are both 20 degrees; the width of the middle partition 3 is 400mm, the height is 2000mm, the wall thickness is 5mm, the bottom surface is used as a height reference point, a water baffle 21 is arranged between 0mm and 1200mm, a water permeable plate 19 is arranged between 1200mm and 2000mm, the aperture of the water permeable hole 20 is 2mm, five groups of water inlets 1 are arranged, the aperture is 25mm, and the distance between each group of water inlets 1 is 100 mm.
The invention solves the technical problems that:
(1) simulating clay agglomeration at base-coated interfaces
During the seepage process of the weathered soil body, the clay particles move to the top surface of the bed rock to be gathered to form a soft weak zone, the cement is used for pouring the bed rock surface, and the process that the clay particles are gathered at the top of the bed rock surface in the actual working condition is simulated.
(2) Simulating different morphologies of basal-covering interfaces
The influence of different forms of foundation covering interfaces on the migration and aggregation characteristics of the granite binary structure side slope clay can be visually compared by pouring broken line type and step type two groups of foundation rock surfaces with different forms by using cement.
(3) Monitoring of cosmid migration and aggregation
Because the clay particles are very fine and difficult to monitor by conventional means, the content and the space distribution form change rule of the 137Cs tracer are monitored by a nuclide tracer technology by utilizing the characteristics that the clay particles can be tightly combined with the 137Cs tracer and are difficult to be leached and dissolved, and the space-time rule of clay particle migration motion in the seepage process is represented.
A seepage test method for simulating a granite binary structure side slope adopts the seepage test device for simulating the granite binary structure side slope, and comprises the following steps:
(1) installing a seepage test device according to test requirements and a test site, and pouring inclined bedrock surfaces with different forms in a test area by using cement according to the test requirements;
(2) the clay particles in the sieved granite weathered soil are doped with 137Cs nuclide tracer, and fully stirred and mixed; preparing a test soil sample required by the test according to the original grain composition of the weathered soil, filling the test soil sample into a test area of a test soil tank layer by layer according to a certain compactness, paving a layer of coarse-grained soil with a thickness as a buffer layer on the top surface of the granite weathered soil, wherein the height of the filled granite weathered soil 7 is 1000mm, and the thickness of the buffer layer 4 is 50 mm; the whole height (namely the height of the bedrock, the height of the weathered soil layer and the height of the buffer layer) after filling is lower than the height of the lowest permeable hole on the middle partition plate;
(3) installing a pore water pressure gauge on a pressure measuring hole, starting and testing the working state of each measuring instrument, adjusting the shooting range of a camera, and acquiring the content and the spatial distribution state of 137Cs nuclide tracer before testing by using a nuclide identification instrument;
(4) opening the control water valve of the lowest water inlet, closing the other control water valves, injecting seepage water, and starting a seepage test;
(5) in the test process, the pore water pressure meter reading collected by the data collector is utilized; utilizing a camera to shoot and collect the migration and aggregation processes of fine particles in the test soil tank at regular time; recording the accumulated water yield of the water collection tank at each time interval; monitoring and recording the concentration of the clay particles in the lost water body at each time interval by using a turbidity meter; monitoring the content and the spatial distribution form of the 137Cs tracer in the test soil tank by using a nuclide identifier;
(6) after seepage is stable, clay particles in the soil body do not move any more, all monitoring data have no obvious fluctuation, the current control water valve is closed, the control water valve of the last water inlet is opened, the height of the seepage head is increased, a seepage test is continued, and the change of all data is monitored by using a measuring system;
(7) and when the water is lifted to the highest water head to achieve seepage stability or a large amount of fine particles of the test soil sample are lost under a certain hydraulic gradient to form an obviously through seepage channel or gather on a base-covering interface to form a weak thin layer, finishing the seepage test.
Any embodiment disclosed herein above is meant to disclose, unless otherwise indicated, all numerical ranges disclosed as being preferred, and any person skilled in the art would understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Since the numerical values are too numerous to be exhaustive, some of the numerical values are disclosed in the present invention to illustrate the technical solutions of the present invention, and the above-mentioned numerical values should not be construed as limiting the scope of the present invention.
If the invention discloses or relates to parts or structures which are fixedly connected to each other, the fixedly connected parts can be understood as follows, unless otherwise stated: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
In addition, terms used in any technical solutions disclosed in the present invention to indicate positional relationships or shapes include approximate, similar or approximate states or shapes unless otherwise stated.
Any part provided by the invention can be assembled by a plurality of independent components or can be manufactured by an integral forming process.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (6)
1. The utility model provides a seepage flow test device of simulation granite binary structure side slope which characterized in that: the soil testing device comprises a test soil tank with an open top, wherein a middle partition board for dividing the inner space of the test soil tank into two test areas is arranged in the middle of the test soil tank; the bottom in one test zone is a cement-poured broken line type foundation rock surface, the bottom in the other test zone is a cement-poured step type foundation rock surface, the broken line type foundation rock surface and the step type foundation rock surface are both provided with slopes and form an inverted V-shaped structure; granite weathered soil is filled above the bedrock surfaces in the two test areas, and a buffer layer is laid on the upper surface of the granite weathered soil; the upper parts of the side walls of the two test areas are respectively provided with a plurality of water inlets, the lower parts of the side walls of the two test areas are respectively provided with a water outlet at the lower part of the bedrock surface, and the side walls of the two test areas in the region where the granite weathered soil is located are provided with a plurality of pressure measuring holes.
2. The seepage test device for simulating the granite binary structure slope according to claim 1, characterized in that: the device also comprises a camera and a nuclide identifier which are positioned on the front side of the test soil tank; the pressure measuring holes in the side wall of the test area are arranged at intervals along the vertical direction, pore water pressure gauges are installed on the pressure measuring holes, and the pore water pressure gauges are electrically connected with a data acquisition instrument; and a water collection tank below the water outlet, wherein a turbidity meter is arranged on the water collection tank.
3. The seepage test device for simulating the granite binary structure slope as claimed in claim 2, characterized in that: the water inlets on the side wall of the test area are arranged at intervals along the vertical direction, and the control water valve is arranged at the water inlet.
4. The seepage test device for simulating the granite binary structure slope according to claim 1, characterized in that: the test soil tank is of a cuboid structure and made of transparent organic glass, and a steel frame base is arranged below the test soil tank; the water outlet is provided with a water outlet porous plate, and the water outlet porous plate is provided with a water outlet hole with the aperture of 1 mm.
5. The seepage test device for simulating the granite binary structure slope according to claim 1, characterized in that: the intermediate bottom comprises the porous disk on upper portion and the water-stop sheet of lower part, offers a plurality of diameters on the porous disk to be 2 mm's the hole of permeating water, and the buffer layer height is not higher than the hole height of permeating water of the position minimum on the porous disk.
6. A seepage test method for simulating granite binary structure side slope is characterized in that: the seepage test device for simulating the granite binary structure slope according to claim 3 comprises the following steps:
(1) installing a seepage test device according to test requirements and a test site, and pouring inclined bedrock surfaces with different forms in a test area by using cement according to the test requirements;
(2) the clay particles in the sieved granite weathered soil are doped with 137Cs nuclide tracer, and fully stirred and mixed; preparing a test soil sample required by the test according to the original grain composition of the weathered soil, filling the test soil sample into a test area of a test soil tank layer by layer according to a certain compactness, and paving a layer of coarse-grained soil with a thickness on the top surface of the granite weathered soil to serve as a buffer layer;
(3) installing a pore water pressure gauge on a pressure measuring hole, starting and testing the working state of each measuring instrument, adjusting the shooting range of a camera, and acquiring the content and the spatial distribution state of 137Cs nuclide tracer before testing by using a nuclide identification instrument;
(4) opening the control water valve of the lowest water inlet, closing the other control water valves, injecting seepage water, and starting a seepage test;
(5) in the test process, the pore water pressure meter reading collected by the data collector is utilized; utilizing a camera to shoot and collect the migration and aggregation processes of fine particles in the test soil tank at regular time; recording the accumulated water yield of the water collection tank at each time interval; monitoring and recording the concentration of the clay particles in the lost water body at each time interval by using a turbidity meter; monitoring the content and the spatial distribution form of the 137Cs tracer in the test soil tank by using a nuclide identifier;
(6) after seepage is stable, clay particles in the soil body do not move any more, all monitoring data have no obvious fluctuation, the current control water valve is closed, the control water valve of the last water inlet is opened, the height of the seepage head is increased, a seepage test is continued, and the change of all data is monitored by using a measuring system;
(7) and when the water is lifted to the highest water head to achieve seepage stability or a large amount of fine particles of the test soil sample are lost under a certain hydraulic gradient to form an obviously through seepage channel or gather on a base-covering interface to form a weak thin layer, finishing the seepage test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210046548.4A CN114414455B (en) | 2022-01-17 | 2022-01-17 | Seepage test device and method for simulating granite binary structure side slope |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210046548.4A CN114414455B (en) | 2022-01-17 | 2022-01-17 | Seepage test device and method for simulating granite binary structure side slope |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114414455A true CN114414455A (en) | 2022-04-29 |
| CN114414455B CN114414455B (en) | 2023-08-22 |
Family
ID=81273744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210046548.4A Active CN114414455B (en) | 2022-01-17 | 2022-01-17 | Seepage test device and method for simulating granite binary structure side slope |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114414455B (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205426884U (en) * | 2015-04-29 | 2016-08-03 | 长沙理工大学 | Overburden slope stability test model of multi -angle basement rock can simulate |
| CN106198339A (en) * | 2015-05-29 | 2016-12-07 | 长沙理工大学 | A kind of covering layer slope seepage flow characteristics considering rainfall infiltration and stability model |
| KR101689734B1 (en) * | 2015-12-24 | 2016-12-27 | (주)더그린 | Eco concrete artificial rock construct for the prevention of rockslide, flood damage and for the slope vegetation of steep-slope land |
| CN107037195A (en) * | 2016-10-31 | 2017-08-11 | 中国地质大学（武汉） | Water-level fluctuation influences experimental rig and method to lower sleeping ice sheet talus slope stability |
| CN107367599A (en) * | 2017-09-01 | 2017-11-21 | 中国电建集团成都勘测设计研究院有限公司 | Water power reservoir area rock slope with along layer near cut Experimental mimic system |
| CN107907656A (en) * | 2017-11-15 | 2018-04-13 | 南京科兴新材料科技有限公司 | A kind of seepage stress rainfall couples the visual experimental rig of slope instability land movement and test method |
| CN207408280U (en) * | 2017-10-27 | 2018-05-25 | 浙江省交通规划设计研究院 | A kind of soil body penetration deformation testing device collapsed for covered karst area |
| CN110836961A (en) * | 2019-11-04 | 2020-02-25 | 中国地质大学（武汉） | Model test system and method for foundation pit construction stability research under influence of rainfall |
| CN210482335U (en) * | 2019-06-03 | 2020-05-08 | 中铁第四勘察设计院集团有限公司 | Supporting structure of rock-soil binary structure side slope |
| CN111474323A (en) * | 2020-03-17 | 2020-07-31 | 北京工业大学 | Model test system for simulating soil slope collapse process |
| CN112684147A (en) * | 2020-12-28 | 2021-04-20 | 武汉科技大学 | Rock slope excavation model test device and method under multi-field coupling effect |
-
2022
- 2022-01-17 CN CN202210046548.4A patent/CN114414455B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205426884U (en) * | 2015-04-29 | 2016-08-03 | 长沙理工大学 | Overburden slope stability test model of multi -angle basement rock can simulate |
| CN106198339A (en) * | 2015-05-29 | 2016-12-07 | 长沙理工大学 | A kind of covering layer slope seepage flow characteristics considering rainfall infiltration and stability model |
| KR101689734B1 (en) * | 2015-12-24 | 2016-12-27 | (주)더그린 | Eco concrete artificial rock construct for the prevention of rockslide, flood damage and for the slope vegetation of steep-slope land |
| CN107037195A (en) * | 2016-10-31 | 2017-08-11 | 中国地质大学（武汉） | Water-level fluctuation influences experimental rig and method to lower sleeping ice sheet talus slope stability |
| CN107367599A (en) * | 2017-09-01 | 2017-11-21 | 中国电建集团成都勘测设计研究院有限公司 | Water power reservoir area rock slope with along layer near cut Experimental mimic system |
| CN207408280U (en) * | 2017-10-27 | 2018-05-25 | 浙江省交通规划设计研究院 | A kind of soil body penetration deformation testing device collapsed for covered karst area |
| CN107907656A (en) * | 2017-11-15 | 2018-04-13 | 南京科兴新材料科技有限公司 | A kind of seepage stress rainfall couples the visual experimental rig of slope instability land movement and test method |
| CN210482335U (en) * | 2019-06-03 | 2020-05-08 | 中铁第四勘察设计院集团有限公司 | Supporting structure of rock-soil binary structure side slope |
| CN110836961A (en) * | 2019-11-04 | 2020-02-25 | 中国地质大学（武汉） | Model test system and method for foundation pit construction stability research under influence of rainfall |
| CN111474323A (en) * | 2020-03-17 | 2020-07-31 | 北京工业大学 | Model test system for simulating soil slope collapse process |
| CN112684147A (en) * | 2020-12-28 | 2021-04-20 | 武汉科技大学 | Rock slope excavation model test device and method under multi-field coupling effect |
Non-Patent Citations (1)
| Title |
|---|
| 陈玮;简文彬;董岩松;林兴旺;: "某含软弱夹层花岗岩残积土边坡稳定性研究", 水利与建筑工程学报, no. 06, pages 107 - 111 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114414455B (en) | 2023-08-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104880396B (en) | The soil body two is to flow model in porous media device and method of testing under outside charge function | |
| US20220205971A1 (en) | Integrated test device and method for filling karst cave deposition and tunnel intermittent water and mud inrush disasters | |
| CN207908316U (en) | A kind of device quickly measuring a variety of sand infiltration coefficients | |
| CN108088982B (en) | Simulate the Experimental Method in Laboratory of fine grained seepage inflow erosion inside deep aquifers sand | |
| CN203981507U (en) | A kind of novel planar strain consolidation testing device | |
| CN103592424B (en) | Bedding bank slope piestic water physical model test device | |
| CN103236209B (en) | Riverway cross-section two-dimensional underground seepage hydraulic experiment device | |
| CN107290501B (en) | Crack fault type geological structure internal filling medium seepage instability water inrush experiment device and method | |
| CN111693436A (en) | Coarse sandy soil horizontal seepage model box and test method thereof | |
| CN105092798A (en) | Indoor recirculation system for simulating varying-head water-permeable soil layer phreatic water stratum and experimental method | |
| CN111337650A (en) | Multifunctional test device for researching underground engineering soil body seepage failure mechanism | |
| CN112697672A (en) | Simulation test device and test method for piping damage of layered embankment foundation | |
| CN212459324U (en) | Coarse sand horizontal seepage model box | |
| CN103389260A (en) | Laboratory simulation test method for researching underground water seepage obstruction caused by pile foundation | |
| CN112834375B (en) | Soil and stone water tank erosion test device considering seepage | |
| CN109085323A (en) | It is a kind of can hierarchical control water level delaminating deposition model test apparatus and test method | |
| CN204925080U (en) | Simulation becomes indoor system of recharging in flood peak permeable ground dive stratum | |
| CN108872042A (en) | Sand level, vertical infiltration coefficient simultaneous determination apparatus and its test method | |
| CN203821294U (en) | Model test device for simulating reservoir earth dam seepage damage developing process | |
| CN203821298U (en) | Model test device for studying underseepage damage of impermeable dam body | |
| CN111239370A (en) | Experimental method for simulating karst collapse caused by underground water | |
| CN203365432U (en) | Soil-water characteristic curve testing instrument applicable to special coarse-grained soil | |
| AU2020104397A4 (en) | Experimental Facility and Method for Simulating Hydrodynamic Sand Carrying under Coupled Action of Seepage and Vibration | |
| CN114414455A (en) | Seepage test device and method for simulating granite binary structure slope | |
| CN107044131A (en) | A kind of anti-seepage method of deep covering layer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |