CN203629964U - Test device for stimulating high-earth pressure condition by using bentonite slurry for pressurizing - Google Patents
Test device for stimulating high-earth pressure condition by using bentonite slurry for pressurizing Download PDFInfo
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- CN203629964U CN203629964U CN201320787160.6U CN201320787160U CN203629964U CN 203629964 U CN203629964 U CN 203629964U CN 201320787160 U CN201320787160 U CN 201320787160U CN 203629964 U CN203629964 U CN 203629964U
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Abstract
The utility model discloses a test device for stimulating a high-earth pressure condition by using bentonite slurry for pressurizing. According to the test device, a molding test soil sample is located on a bottom cover; the outer surface of the molding test soil sample is at least coated with one layer of anti-seepage bentonite felt; the outer surface of the anti-seepage bentonite felt is at least coated with one layer of bentonite plaster; the bottom end of a test cylinder is fixedly mounted on a bottom cover; the bottom cover is used for sealing an opening at the bottom end of the test cylinder; the molding test soil sample, the anti-seepage bentonite felt and the bentonite plaster are all located inside the test cylinder; an upper end cover is fixedly mounted at the top of the test cylinder; the upper end cover is used for sealing an opening at the upper end of the test cylinder; an outlet of a slurry pump and an inlet of a liquid inlet valve are conducted through fluid; one end of a liquid inlet pipe and an outlet of the liquid inlet valve are conducted through the fluid; the other end of the liquid inlet pipe passes through the bottom cover from the bottom of the bottom cover and is conducted with a cavity inside the test cylinder through fluid. The test device provided by the utility model can be used for carrying out a high-earth pressure condition simulation test by applying a larger confining pressure to a large test piece with a rough surface; furthermore, devices such as a model freezing pipe and a sensor, which are embedded in the test piece, are prevented from being damaged.
Description
Technical field
The utility model relates to ground test specimen confined pressure charger, particularly a kind of test unit that utilizes pressure ring border, bentonite slurry Simulation Study On Pressure highland.
Background technology
At present, ground test specimen confined pressure is loaded and mainly adopted in two ways, and one is to adopt to isolate at sample overcoat glued membrane or material contracting with heat, then with hydraulic oil, test specimen is carried out to confined pressure loading, it is relatively closely knit that this test method is applicable to entirety, the small specimen that surface is relatively smooth.Use the method to load the large test specimen with larger compress variation, diaphragm material easily embeds in sample and is punctured by sample particle under confined pressure effect, hydraulic oil can enter test specimen inside by rent, cause test failure, and test specimen is polluted, therefore, if the method loads to large-scale ground test specimen the condition that confined pressure is less that is only applicable to.Another is in test cylinder, to make and to tamp test specimen, build isolated material at sample upper surface, apply again area load, side direction provides support reaction by test cylinder barrel, realize self-equilibrating, this loading method can apply very large load to ground test specimen, thereby simulation pressure ring border, highland, but the method has also been brought another problem, be that large volume test soil sample is in loading procedure, top consolidation deformation is larger, lower deformation is little, the model blocking pipe and the operative sensor that make to be embedded in sample suffer damage, this damage will cause test failure to a great extent.
Utility model content
For the deficiencies in the prior art, the purpose of this utility model is to provide a kind of test unit that utilizes pressure ring border, bentonite slurry Simulation Study On Pressure highland, make can simulate highland pressure environmental test by the scraggly large test specimen of effects on surface under larger confined pressure, and can not damage the model blocking pipe and the sensor device that are embedded in sample.
The technical solution of the utility model is achieved in that a kind of test method of utilizing pressure ring border, bentonite slurry Simulation Study On Pressure highland, comprises the steps:
(a) on the bottom of test cylinder, make test soil sample, moulding test soil sample is positioned on bottom;
(b) at moulding test soil sample outer wrapping bentonitic clay antiseepage blanket;
(c) smear bentonitic clay clay at bentonitic clay antiseepage blanket outside surface;
(d) bottom of test cylinder is fixedly mounted on bottom, the bottom end opening of bottom blocking test cylinder, moulding test soil sample is positioned at test cylinder, utilizes the upper end open of upper end cover blocking test cylinder;
(e) open atmospheric valve and liquid feed valve, open steam piano, in test cylinder, inject mud, until blow-down pipe overflows after mud continuously, close atmospheric valve;
(f) utilize steam piano to continue to be pressurized to slip casting in test cylinder the pressure needing, close liquid feed valve, and close steam piano.
The above-mentioned test method of utilizing pressure ring border, bentonite slurry Simulation Study On Pressure highland, in step (b): after the outsourcing of moulding test soil sample wraps bentonitic clay antiseepage blanket, at bentonitic clay antiseepage blanket, bentonitic clay clay is smeared by lap-joint, and at bentonitic clay antiseepage blanket and border, bottom contact position bentonitic clay clay back cover.
The above-mentioned test method of utilizing pressure ring border, bentonite slurry Simulation Study On Pressure highland, in step (c): first tighten with strap in bentonitic clay antiseepage blanket outside; And then smear one deck bentonitic clay clay at the bentonitic clay antiseepage blanket outside surface of tightening, and be then wound around two-layer mesh and be more than or equal to 40 object nylon wires, finally on nylon wire, smear again one deck bentonitic clay clay.
The above-mentioned test method of utilizing pressure ring border, bentonite slurry Simulation Study On Pressure highland, also comprise afterwards step (g) in step (f): open pressure-supplementing valve, utilize PLC controller acquisition test cylinder pressure data, if the test cylinder internal pressure deficiency control signal that PLC controller is opened to the output of motor servo loading unit, motor servo loading unit pressurizes in test cylinder by pressure-supplementing valve after opening, when test cylinder internal pressure reaches set pressure, PLC controller exports the control signal of cutting out to motor servo loading unit, carry out pressure maintenance, until off-test.
Utilize the test unit in pressure ring border, bentonite slurry Simulation Study On Pressure highland, moulding test soil sample is positioned on bottom, and moulding test soil sample outside surface at least wraps up one deck bentonitic clay antiseepage blanket, and bentonitic clay antiseepage blanket outside surface is at least coated with one deck bentonitic clay clay; The bottom of test cylinder is fixedly mounted on bottom, the bottom end opening of bottom blocking test cylinder, and moulding test soil sample, bentonitic clay antiseepage blanket and bentonitic clay clay are all positioned at test cylinder; The top of test cylinder is installed with upper end cover, the upper end open of upper end cover blocking test cylinder; The inlet fluid conducting of mud delivery side of pump and liquid feed valve, the outlet fluid communication of one end of feed tube and liquid feed valve, the other end of feed tube from bottom bottom through bottom and with test cylinder in layer Cavity Flow conducting; Through upper end cover and with test cylinder in the pipeline of layer Cavity Flow conducting and the inlet fluid conducting of atmospheric valve, the outlet of atmospheric valve and blow-down pipe fluid communication.
The above-mentioned test unit that utilizes pressure ring border, bentonite slurry Simulation Study On Pressure highland, pressure transducer is installed on upper end cover, pressure transducer passes through through the layer Cavity Flow conducting in pipeline and the test cylinder of upper end cover, the output terminal of pressure transducer is connected with the input end of PLC controller, the output terminal of PLC controller is connected with the input end of motor servo loading unit, motor servo loading unit drives the piston that is positioned at pressurized cylinder to do compression movement by leading screw, high-pressure slurry in plunger shaft is moved to pressure-supplementing valve by ftercompction pipe, the inlet fluid conducting of ftercompction pipe and pressure-supplementing valve, pass the layer Cavity Flow conducting in pipeline and the test cylinder of bottom from bottom bottom, the outlet of pressure-supplementing valve and the pipeline inlet fluid conducting through bottom from bottom bottom.
The above-mentioned test unit that utilizes pressure ring border, bentonite slurry Simulation Study On Pressure highland, bentonitic clay antiseepage blanket outside surface is coated with two-layer bentonitic clay clay, between two-layer bentonitic clay clay for mesh is more than or equal to 40 object nylon wires.
The beneficial effects of the utility model are: in (1) the utility model, adopt bentonite slurry loading method, it is the sample soil body bentonitic clay clay coating of existing one deck outward, along with loading the injection of mud, mud forms layer of mud film in the surperficial dehydration deposition of bentonitic clay clay coating, and the moisture content that the formation of mud film can prevent from loading in mud well enters in test soil sample by bentonitic clay antiseepage blanket; Owing to having bentonitic clay in bentonitic clay antiseepage blanket, even if a small amount of moisture content loading in mud penetrates bentonitic clay clay layer, the bentonitic clay in bentonitic clay antiseepage blanket also can absorb it completely and stop it to enter in test soil sample; In practice of construction, can, by regulating the viscosity of bentonite slurry, can accelerate the formation of mud film, reduce bentonite slurry fluid loss.(2) the antiseepage effect of bentonitic clay antiseepage blanket, has greatly reduced the water yield entering in the sample soil body, and a small amount of moisture content entering is also not enough to sample to form impact.Therefore, the method can realize easily the integral high pressure of sample is loaded.(3) flexibility of bentonitic clay antiseepage blanket is large, can stretch, and tackles deformability strong; If test soil sample larger distortion or inhomogeneous distortion occurs loading under mud pressure, also self-adaptation completely of bentonitic clay antiseepage blanket, can not break or seepage, guarantees to load mud and moisture content and can not enter and test in soil sample.(4) self-reparing capability is strong: even if under extreme conditions bentonitic clay antiseepage blanket has breakage, owing to having between bentonitic clay clay layer and two-layer bentonitic clay clay layer and having nylon wire at bentonitic clay antiseepage blanket skin, so just can form rapidly mud film and stop loading mud and moisture content to enter in test soil sample at breakage, and along with the loading of mud, the mud film of breakage is more and more thicker, thereby can prevent from well loading mud and moisture content enters test soil sample.(5) be not only applicable to the relatively smooth small specimen in surface and large test specimen, the test specimen of nonaffine deformation occurs while being also applicable to have the large test specimen of larger compress variation and compression, and bentonitic clay antiseepage blanket can prevent from being tested soil sample particle and punctures.
Accompanying drawing explanation
Fig. 1 is the structural representation that the utility model utilizes the test unit in pressure ring border, bentonite slurry Simulation Study On Pressure highland.
In figure: 1-PLC controller, 2-data line, 3-control line, 4-motor servo loading unit, 5-ftercompction pipe, 6-pressure-supplementing valve, 7-bentonitic clay clay back cover, 8-pressure transducer, 9-blow-down pipe, 10-atmospheric valve, 11-loads mud, 12-upper end cover, 13-test cylinder, 14-bentonitic clay antiseepage blanket, 15-bentonitic clay clay, 16-tests soil sample, 17-bottom, 18-feed tube, 19-liquid feed valve, 20-steam piano, 21-nylon wire, 22-pressurized cylinder, 23-piston, 24-leading screw.
Embodiment
As shown in Figure 1, in the test unit that utilizes pressure ring border, bentonite slurry Simulation Study On Pressure highland of the present embodiment: moulding test soil sample 16 is positioned on bottom 17, moulding test soil sample 16 outside surfaces wrap up two-layer bentonitic clay antiseepage blanket 14, bentonitic clay antiseepage blanket 14 outside surfaces are coated with two-layer bentonitic clay clay 15, between two-layer bentonitic clay clay 15 for mesh is more than or equal to 40 object nylon wires 21; The bottom of test cylinder 13 is fixedly mounted on bottom 17, the bottom end opening of bottom 17 blocking test cylinders 13, and moulding test soil sample 16, bentonitic clay antiseepage blanket 14 and bentonitic clay clay 15 are all positioned at test cylinder 13; The top of test cylinder 13 is installed with upper end cover 12, the upper end open of upper end cover 12 blocking test cylinders 13; The inlet fluid conducting of the outlet of steam piano 20 and liquid feed valve 19, the outlet fluid communication of one end of feed tube 18 and liquid feed valve 19, the other end of feed tube 18 from bottom bottom through bottom and with test cylinder 13 in layer Cavity Flow conducting; Through upper end cover 12 and with test cylinder 13 in the pipeline of layer Cavity Flow conducting and the inlet fluid conducting of atmospheric valve 10, the outlet of atmospheric valve 10 and blow-down pipe 9 fluid communication.
In addition, pressure transducer 8 is installed on upper end cover 12, pressure transducer 8 passes through through the layer Cavity Flow conducting in pipeline and the test cylinder 13 of upper end cover 12, the output terminal of liquid-pressure pick-up is connected with the input end of PLC controller 1, the output terminal of PLC controller 1 is connected with the input end of motor servo loading unit 4, motor servo loading unit 4 drives the piston 23 that is positioned at pressurized cylinder 22 to do compression movement by leading screw 24, the high-pressure slurry that is positioned at plunger shaft is moved to pressure-supplementing valve 6 by ftercompction pipe 5, the inlet fluid conducting of ftercompction pipe 5 and pressure-supplementing valve 6, layer Cavity Flow conducting in pipeline and the test cylinder 13 of bottom are passed in bottom 17 bottoms, the outlet of pressure-supplementing valve 6 and the pipeline inlet fluid conducting through bottom 17 from bottom 17 bottoms.
On the basis of the test unit of the present embodiment, utilize the test method in pressure ring border, bentonite slurry Simulation Study On Pressure highland, comprise the steps:
(a) on the bottom 17 of test cylinder 13, make test soil sample 16, moulding test soil sample 16 is positioned on bottom 17;
(b) first at moulding test soil sample 16 outer wrapping bentonitic clay antiseepage blankets 14, then smear bentonitic clay clay 15 in bentonitic clay antiseepage blanket 14 lap-joints, finally form sealing in bentonitic clay antiseepage blanket 14 and bottom 17 borders, contact position with bentonitic clay clay back cover;
(c) first tighten with strap in bentonitic clay antiseepage blanket 14 outsides; And then smear one deck bentonitic clay clay 15 at bentonitic clay antiseepage blanket 14 outside surfaces of tightening, and be then wound around two-layer mesh and be more than or equal to 40 object nylon wires 21, finally on nylon wire, smear again one deck bentonitic clay clay 15;
(d) bottom of test cylinder 13 is fixedly mounted on bottom 17, the bottom end opening of bottom 17 blocking test cylinders 13, moulding test soil sample 16 is positioned at test cylinder 13, utilizes the upper end open of upper end cover 12 blocking test cylinders 13;
(e) open atmospheric valve 10 and liquid feed valve 19, open steam piano 20, to the interior injection mud of test cylinder 13, until blow-down pipe 9 overflows after mud continuously, close atmospheric valve 10;
(f) utilize steam piano 20 to continue to be pressurized to the interior slip casting of test cylinder 13 pressure needing, close liquid feed valve 19, and close steam piano 20;
(g) open pressure-supplementing valve 6, utilize PLC controller 1 acquisition test cylinder 13 internal pressure data, if the test cylinder 13 internal pressure deficiencies control signal that PLC controller 1 is opened to 4 outputs of motor servo loading unit, motor servo loading unit 4 drives the piston 23 that is positioned at pressurized cylinder 22 to do compression movement by leading screw 24, the high-pressure slurry that is positioned at plunger shaft is moved to pressure-supplementing valve 6 by ftercompction pipe 5, realize by pressure-supplementing valve 6 to the interior pressurization of test cylinder 13, when test cylinder 13 internal pressures reach set pressure, PLC controller 1 exports the control signal of cutting out to motor servo loading unit 4, carry out pressure maintenance, until off-test.
Utilize steam piano 20 to the interior slip casting pressurization of test cylinder 13, point 0.5Mpa, 1Mpa, 2Mpa and 5 grades of 4Mpa design experiment pressure successively order load, until pressure stability is closed liquid feed valve 19, and close steam piano 20.
Above-described embodiment is only for the utility model creation example is clearly described, and not the utility model is created the restriction of embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here without also giving exhaustive to all embodiments.And the apparent variation of being amplified out thus or variation are still among the utility model is created the protection domain of claim.
Claims (3)
1. one kind is utilized the test unit in pressure ring border, bentonite slurry Simulation Study On Pressure highland, it is characterized in that, moulding test soil sample is positioned on bottom, and moulding test soil sample outside surface at least wraps up one deck bentonitic clay antiseepage blanket, and bentonitic clay antiseepage blanket outside surface is at least coated with one deck bentonitic clay clay; The bottom of test cylinder is fixedly mounted on bottom, the bottom end opening of bottom blocking test cylinder, and moulding test soil sample, bentonitic clay antiseepage blanket and bentonitic clay clay are all positioned at test cylinder; The top of test cylinder is installed with upper end cover, the upper end open of upper end cover blocking test cylinder; The inlet fluid conducting of mud delivery side of pump and liquid feed valve, the outlet fluid communication of one end of feed tube and liquid feed valve, the other end of feed tube from bottom bottom through bottom and with test cylinder in layer Cavity Flow conducting; Through upper end cover and with test cylinder in the pipeline of layer Cavity Flow conducting and the inlet fluid conducting of atmospheric valve, the outlet of atmospheric valve and blow-down pipe fluid communication.
2. the test unit that utilizes pressure ring border, bentonite slurry Simulation Study On Pressure highland according to claim 1, it is characterized in that, pressure transducer is installed on upper end cover, pressure transducer passes through through the layer Cavity Flow conducting in pipeline and the test cylinder of upper end cover, the output terminal of liquid-pressure pick-up is connected with the input end of PLC controller, the output terminal of PLC controller is connected with the input end of motor servo loading unit, motor servo loading unit drives the piston that is positioned at pressurized cylinder to do compression movement by leading screw, high-pressure slurry in plunger shaft is moved to pressure-supplementing valve by ftercompction pipe, the inlet fluid conducting of ftercompction pipe and pressure-supplementing valve, pass the layer Cavity Flow conducting in pipeline and the test cylinder of bottom from bottom bottom, the outlet of pressure-supplementing valve and the pipeline inlet fluid conducting through bottom from bottom bottom.
3. the test unit that utilizes pressure ring border, bentonite slurry Simulation Study On Pressure highland according to claim 2, it is characterized in that, bentonitic clay antiseepage blanket outside surface is coated with two-layer bentonitic clay clay, between two-layer bentonitic clay clay for mesh is more than or equal to 40 object nylon wires.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320787160.6U CN203629964U (en) | 2013-12-05 | 2013-12-05 | Test device for stimulating high-earth pressure condition by using bentonite slurry for pressurizing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320787160.6U CN203629964U (en) | 2013-12-05 | 2013-12-05 | Test device for stimulating high-earth pressure condition by using bentonite slurry for pressurizing |
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| CN203629964U true CN203629964U (en) | 2014-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320787160.6U Withdrawn - After Issue CN203629964U (en) | 2013-12-05 | 2013-12-05 | Test device for stimulating high-earth pressure condition by using bentonite slurry for pressurizing |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103822827A (en) * | 2013-12-05 | 2014-05-28 | 北京中煤矿山工程有限公司 | Test method and device for simulating high-ground-pressure environment through bentonite slurry pressurization |
| CN107228794A (en) * | 2017-06-14 | 2017-10-03 | 哈尔滨工业大学深圳研究生院 | Drying and watering cycle unsaturated soil triaxial apparatus based on temperature control |
-
2013
- 2013-12-05 CN CN201320787160.6U patent/CN203629964U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103822827A (en) * | 2013-12-05 | 2014-05-28 | 北京中煤矿山工程有限公司 | Test method and device for simulating high-ground-pressure environment through bentonite slurry pressurization |
| CN103822827B (en) * | 2013-12-05 | 2016-10-05 | 北京中煤矿山工程有限公司 | Utilize test method and the device in pressure ring border, bentonite slurry Simulation Study On Pressure highland |
| CN107228794A (en) * | 2017-06-14 | 2017-10-03 | 哈尔滨工业大学深圳研究生院 | Drying and watering cycle unsaturated soil triaxial apparatus based on temperature control |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140604 Effective date of abandoning: 20161005 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |