CN101493388B - Gravity hydraulic dead load energy-saving equipment and true triaxial creep experiment system - Google Patents
Gravity hydraulic dead load energy-saving equipment and true triaxial creep experiment system Download PDFInfo
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- CN101493388B CN101493388B CN2008102473536A CN200810247353A CN101493388B CN 101493388 B CN101493388 B CN 101493388B CN 2008102473536 A CN2008102473536 A CN 2008102473536A CN 200810247353 A CN200810247353 A CN 200810247353A CN 101493388 B CN101493388 B CN 101493388B
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Abstract
The invention discloses a gravity hydraulic constant load energy storage device and a true triaxial creep experiment system. The gravity hydraulic constant load energy storage device comprises a fixed piston and a movable cylinder body, the outside of the cylinder body is provided with a carrier platform, when the carrier platform is provided with heavy objects with different weights, a hydraulic loading system is provided with constant loads of different sizes by a fluid infusion hole, and a sample is loaded by the fluid infusion hole and a line. The pressure produced by the heavy objects is balanced by a hand pump so as to supply liquid to the system and provide constant static pressure, and the constant pressure provided by the gravity hydraulic constant load energy storage device can also be changed into different pressures so as to be suitable for axial pressure and side pressure differences in a creep experiment and given pressure differences in a seepage test, thus reducing experimental cost caused by power consumption of the creep experiment.
Description
Technical field
The present invention relates to a kind of load test technology, relate in particular to a kind of gravity hydraulic dead load energy storage equipment and true triaxial creepage experimental system.
Background technology
In the prior art, have two kinds for creep test provides propulsion system, a kind of is the device that adopts hydraulic pump to load, and another kind is the device that relies on weight weight to load by mechanical drive.
Hydraulic pump provides highly pressurised liquid for the creep sample device, by clamping device the coal petrography sample is loaded, but in the process of sample creep (perhaps volume change), the load that is applied to the sample end face fluctuates up and down at a certain load line all the time, and its experimental result can not reach the permanent load of creep test strictness; Simultaneously creep test in general the time longer relatively, hydraulic pump is in running order always in experimentation, causes a large amount of energy resource consumptions like this, has increased experimental expenses.
Utilize lever principle or gear drive principle to adopt weight to provide power for creep test, its load value (tonnage) and displacement are very limited, and be difficult to horizontal loading is provided and can only carry out the uniaxial compression creep test, its test gained result is very restricted for the understanding of the creep mechanical property under the coal petrography sample complex conditions.There is following shortcoming at least in above-mentioned prior art: the structure relative complex, be difficult to provide the requirement of creep dead load.
Summary of the invention
The purpose of this invention is to provide a kind of simple in structure, gravity hydraulic dead load energy storage equipment and true triaxial creepage experimental system that permanent load can be provided.
The objective of the invention is to be achieved through the following technical solutions:
Gravity hydraulic dead load energy storage equipment of the present invention comprises base, and the top of described base is provided with fixed piston, and described fixed piston outside is with active cylinder block, and described active cylinder block outside is provided with article carrying platform;
Be provided with infusion hole in the described fixed piston, the plunger shaft between described fixed piston and the active cylinder block is by described infusion hole and exterior.
True triaxial creepage experimental system of the present invention comprises hydraulic loading system, and described hydraulic loading system is provided with above-mentioned gravity hydraulic dead load energy storage equipment.
As seen from the above technical solution provided by the invention, gravity hydraulic dead load energy storage equipment of the present invention and true triaxial creepage experimental system, owing to comprise fixed piston and active cylinder block, plunger shaft is by infusion hole on the fixed piston and exterior, the active cylinder block outside is provided with article carrying platform, simple in structure, can be by the weight of Different Weight be set on article carrying platform, providing to hydraulic loading system by infusion hole can different big or small permanent load.
Description of drawings
Fig. 1 is the structural representation of gravity hydraulic dead load energy storage equipment of the present invention;
Fig. 2 is the structural representation of the true triaxial creepage experimental system of the present invention;
Fig. 3 is the structural representation of potential device among the present invention.
Embodiment
Gravity hydraulic dead load energy storage equipment of the present invention, its preferable embodiment as shown in Figure 1, comprise base 1, the top of base 1 is provided with fixed piston 2, the outside of fixed piston 2 is with active cylinder block 3, forms the plunger shaft that can hold fluid between fixed piston 2 and the active cylinder block 3, can be provided with infusion hole 4 in the fixed piston 2, plunger shaft is used for feed liquor and fluid by infusion hole 4 and exterior.Can be provided with O-ring seal 7 etc. between fixed piston 2 and the active cylinder block 3.
Article carrying platform 5 can be located at the bottom outer rim of active cylinder block 3.
Fixed piston 2 and active cylinder block 3 can adopt the carbon cast steel preparation, and concrete enforcement can adopt the grade of steel of carbon cast steel to be: ZG55; Chemical constitution is: C=0.52%-0.62%, Mn=0.50%-0.80%, Si=0.20%-0.45%; Mechanical property is: yield strength σ
s=350MPa, tensile strength sigma
b=650MPa, length growth rate δ=10%.
Gravity hydraulic dead load energy storage equipment of the present invention, load (counterweight) is applied directly on the cylinder body, thereby forms highly pressurised liquid output, and is simple in structure, can provide the permanent load of different sizes to hydraulic loading system by infusion hole by the weight of Different Weight is set on article carrying platform.
True triaxial creepage experimental system of the present invention, its preferable embodiment comprises hydraulic loading system as shown in Figure 2, hydraulic loading system is provided with above-mentioned gravity hydraulic dead load energy storage equipment (gravity dead load accumulator).
Hydraulic loading system comprises wobble pump, loading oil circuit, fluid infusion oil circuit etc., and wobble pump is connected with loading oil circuit with the fluid infusion oil circuit respectively; Loading oil circuit is connected with gravity hydraulic dead load energy storage equipment, can gravity hydraulic dead load energy storage equipment realizes the constant pressure of whole hydraulic loading system, realizes that constant voltage loads.
Loading oil circuit can be provided with a potential device I, and the output circuit of potential device I is connected with clamper.The hydraulic pressure of loading oil circuit output loads clamper by after the potential device I transformation.
Concrete clamper can be three clampers, comprise that orthogonal vertical Z axle clamp is held device, the horizontal X axle clamp is held device and horizontal Y-axis clamping device, the output circuit of potential device I can be held device with vertical Z axle clamp respectively, the horizontal X axle clamp is held device and is connected with horizontal Y-axis clamping device, realizes that different directions loads.
Wherein, potential device I and horizontal X axle clamp are held the output circuit that device is connected with horizontal Y-axis clamping device can also be respectively equipped with potential device II and potential device III, the loading force that is used for as required the horizontal X axle clamp is held device and horizontal Y-axis clamping device is adjusted, thereby forms true three loadings.
More than each potential device can be in series by plural potential device, thereby realize more transformation ratio by the potential device of a few fixed transformation ratio, obtain multiple different transformation pressure.
True triaxial creepage experimental system of the present invention also comprises seepage flow experiment system, and seepage flow experiment system can provide seepage flow given constant voltage by hydraulic loading system.Because the constant pressure of whole hydraulic loading system also can be realized constant by the seepage flow setting pressure that this system is given.
Concrete seepage flow experiment system comprises entrance pressure valve, check valve, and the entrance pressure valve is connected with hydraulic loading system with potential device V by potential device IV respectively with check valve.After can setting up hydraulic loading system by potential device IV and potential device V as required, control the pressure of entrance pressure valve and check valve respectively, make the constant pressure of entrance pressure valve and check valve, and then provide seepage flow given constant voltage for seepage flow experiment system.
Also comprise in the system: flowmeter, pressure gauge, gas cylinder, displacement meter, constant temperature oven, stop valve, threeway and some pipelines etc.The gravity energy-storage device provides power source and accumulation of energy, and in the process of the test, because the variation of test specimen volume, observation displacement meter liquid level variation adopts wobble pump to carry out fluid infusion timely or drainage in case of necessity, and system's pressure everywhere all keeps constant in the fluid infusion process; The fluid of the gravity energy storage equipment being exported by potential device carries out transformation, satisfies the loading requirement of sample different directions respectively, and for entrance pressure valve and check valve offer level pressure, thereby the pressure differential of sample both ends of the surface percolating medium in the constant seepage tests; By the seepage flow of cmf record percolating medium by the coal petrography sample; Clamper and gas cylinder can be placed in the constant temperature oven, connect and compose dead load creep and seepage flow experiment system by pipeline.
As shown in Figure 3, above-mentioned potential device comprises cylinder body 11, piston 12, the area difference at piston 12 two ends, form big piston chamber 15 and valve piston chamber 16 between the two ends of piston 12 and the cylinder body 11 respectively, big piston chamber 15 and valve piston chamber 16 respectively with exterior, can the area difference by piston 12 two ends realize transformation.Can be provided with packoff 14 between piston 12 and the cylinder body 11, the top of cylinder body 11 can be provided with cylinder cap 13 etc.The big piston bottom communicates with atmosphere by vent port 17 with annular space between the cylinder body, the variation that causes transformation ratio to get rid of that pressure in air compression in this space or the expansion process changes.
To the MPa up to a hundred, and under confined pressure or three loading environments, its intensity can be brought up to hundreds of MPa to the uniaxial compressive strength of coal petrography sample from several MPa.Carry out the creep test of coal petrography sample, not only will satisfy the requirement of strength of sample but also will reach strict constant load, requirement of experiment is loaded into the required load value of sample rapidly and keeps load constant.
Gravity hydraulic dead load energy storage equipment of the present invention based on weight (mechanical type) dead load, is considered to reduce weight of heavy simultaneously, utilizes the hydrostatic transmission ultimate principle, realizes that applying little weight obtains big load, and realizes that dead load reaches the creep test requirement.
True triaxial creepage experimental system of the present invention, by counterweight and cylinder body acting in conjunction on liquid, thereby carry out balance with the high pressure of wobble pump input, highly pressurised liquid is exported by the infusion hole of piston, and by the potential device transformation coal petrography sample is carried out single shaft or multiaxis loading.
Among the present invention, utilize weight to load, utilize piston-type volume-changing and weight lifting accumulation of energy, utilize piston cross-section to change and realize transformation, and seepage flow experiment system adopts the constant entrance pressure valve outlet port of given hydraulic pressure and the check valve inlet pressure of creep test system, realizes the system of true triaxial creepage and seepage tests with hydraulic transmission mode.
Embodiment:
During concrete enforcement, may further comprise the steps: (1) at first calculates sample needs imposed load, thereby determines to apply counterweight weight, and the counterweight that needs apply is loaded on the cylinder body of energy storage equipment; (2) test specimen is put into clamper after, from being clamped to energy storage equipment, with the find time air of each section enclosure space of vacuum pump, infuse in it with wobble pump more successively; (3) before the energy storage equipment transfusion, close the stop valve on the potential device I discharge pipe, adopt wobble pump to pressurize (input pressure liquid), after the cylinder body on the energy storage equipment is raised to certain altitude, close wobble pump, stop transfusion to energy storage equipment; (4) regulate calorstat temperature, open the stop valve on the potential device I discharge pipe, carry out creep test, the height of the cylinder body on time sight displacement meter liquid level variation and the energy storage equipment carries out suitable fluid infusion or drainage to the pipeline that connects clamper in case of necessity; (5) pressure in given entrance pressure valve and the check valve pressure control is opened gas cylinder and is carried out seepage tests; (6) by displacement meter test test piece deformation, flowmeter test seepage flow, pressure gauge is tested pressure everywhere, and the line data of going forward side by side is handled.
In experimentation if volume of sample carries out timely manually fluid infusion or drainage when changing big situation.Can obtain different compressive loads by single potential device or a plurality of potential device connection in series-parallel in the experiment, reach the requirement of various coal petrography sample creep test in conjunction with the gravity of weight on the cylinder body.The data of specific embodiment are as shown in table 1:
Table 1 potential device piston parameter
| Outside diameter/mm | 60 | 60 | 60 | 60 | 60 |
| Big end diameter ratio | 0.93 | 0.87 | 0.71 | 0.50 | 0.35 |
| End diameter/mm | 56.0 | 52.2 | 42.4 | 30.0 | 21.2 |
| Size end area ratio | 0.87 | 0.76 | 0.50 | 0.25 | 0.13 |
| Pressure convergent-divergent multiple | 1.15 | 1.32 | 2.00 | 4.00 | 8.00 |
The present invention can be transformed into the constant pressure that a power source provides different pressure, to adapt to the difference of giving level pressure in axial compression in the creep test, side pressure and the seepage tests.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.
Claims (9)
1. a true triaxial creepage experimental system comprises hydraulic loading system, it is characterized in that, described hydraulic loading system is provided with gravity hydraulic dead load energy storage equipment;
Described gravity hydraulic dead load energy storage equipment comprises base, and the top of described base is provided with fixed piston, and described fixed piston outside is with active cylinder block, and described active cylinder block outside is provided with article carrying platform;
Be provided with infusion hole in the described fixed piston, the plunger shaft between described fixed piston and the active cylinder block is by described infusion hole and exterior.
2. true triaxial creepage experimental system according to claim 1 is characterized in that described article carrying platform is located at the bottom outer rim of described active cylinder block.
3. true triaxial creepage experimental system according to claim 1 is characterized in that described hydraulic loading system comprises wobble pump, loading oil circuit, fluid infusion oil circuit, and described wobble pump is connected with described loading oil circuit with described fluid infusion oil circuit respectively;
Described loading oil circuit is connected with described gravity hydraulic dead load energy storage equipment.
4. true triaxial creepage experimental system according to claim 3 is characterized in that described loading oil circuit is provided with first potential device, and the output circuit of described potential device is connected with clamper.
5. true triaxial creepage experimental system according to claim 4 is characterized in that described clamper is three clampers, comprises that orthogonal vertical Z axle clamp is held device, the horizontal X axle clamp is held device, horizontal Y-axis clamping device;
The output circuit of described first potential device is held device with described vertical Z axle clamp respectively, the horizontal X axle clamp is held device and is connected with horizontal Y-axis clamping device.
6. true triaxial creepage experimental system according to claim 5 is characterized in that, described potential device is held device with described horizontal X axle clamp and is respectively equipped with second potential device with the output circuit that horizontal Y-axis clamping device is connected.
7. according to each described true triaxial creepage experimental system of claim 1 to 6, it is characterized in that comprise seepage flow experiment system, described seepage flow experiment system provides seepage flow given constant voltage by described hydraulic loading system.
8. true triaxial creepage experimental system according to claim 7 is characterized in that described seepage flow experiment system comprises entrance pressure valve, check valve, and described entrance pressure valve is connected with described hydraulic loading system by the 3rd potential device respectively with check valve.
9. true triaxial creepage experimental system according to claim 8, it is characterized in that, described potential device comprises cylinder body, piston, the area difference at described piston two ends, form big piston chamber and valve piston chamber between the two ends of described piston and the described cylinder body respectively, described big piston chamber and valve piston chamber respectively with exterior.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102473536A CN101493388B (en) | 2008-12-30 | 2008-12-30 | Gravity hydraulic dead load energy-saving equipment and true triaxial creep experiment system |
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|---|---|---|---|
| CN2008102473536A CN101493388B (en) | 2008-12-30 | 2008-12-30 | Gravity hydraulic dead load energy-saving equipment and true triaxial creep experiment system |
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| CN101493388A CN101493388A (en) | 2009-07-29 |
| CN101493388B true CN101493388B (en) | 2011-08-17 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101876621B (en) * | 2009-12-18 | 2011-08-31 | 中国科学院武汉岩土力学研究所 | Gravity type constant-pressure liquid supply device |
| CN102323154B (en) * | 2011-05-27 | 2013-07-31 | 中国科学院武汉岩土力学研究所 | High pressure true triaxial test system |
| CN102419295B (en) * | 2011-08-19 | 2013-05-01 | 中国矿业大学(北京) | Loaded coal rock constant pressure gas adsorption desorption testing system and method thereof |
| CN102678681B (en) * | 2012-05-16 | 2015-09-30 | 青岛励赫化工科技有限公司 | A kind of hydraulic constant pressure supplier |
| CN103245562B (en) * | 2013-04-23 | 2015-03-25 | 中国矿业大学 | Gravity constant-pressure electro-hydraulic servo loading system |
| CN103344501B (en) * | 2013-07-20 | 2016-02-24 | 中国水利水电科学研究院 | Large geotechnical triaxial creep test system |
| CN106124385B (en) * | 2016-08-10 | 2020-04-10 | 山东科技大学 | Self-gravity pressurization undisturbed clay ultrafiltration test device |
| CN106153520B (en) * | 2016-08-10 | 2020-04-07 | 山东科技大学 | Ultrafiltration test device for undisturbed clay |
| CN106248551B (en) * | 2016-08-10 | 2020-04-07 | 山东科技大学 | Lateral sectional sampling undisturbed clay ultrafiltration test device |
| CN108333057B (en) * | 2018-05-03 | 2024-02-02 | 山东科技大学 | Lever type coal rock long-term creep test device |
| CN109883848B (en) * | 2019-03-21 | 2021-04-02 | 东北大学 | Full-hydraulic non-servo rock creep test device and method |
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