CN102012339A - Ultra-thin flexible evenly distributed pressure loading device applicable to geomechanical model tests - Google Patents
Ultra-thin flexible evenly distributed pressure loading device applicable to geomechanical model tests Download PDFInfo
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- CN102012339A CN102012339A CN 201010589496 CN201010589496A CN102012339A CN 102012339 A CN102012339 A CN 102012339A CN 201010589496 CN201010589496 CN 201010589496 CN 201010589496 A CN201010589496 A CN 201010589496A CN 102012339 A CN102012339 A CN 102012339A
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Abstract
The invention relates to an ultra-thin flexible evenly distributed pressure loading device applicable to geomechanical model tests, which comprises an ultra-thin hydraulic oil cylinder thruster and a flexible force transmission cushion layer, wherein a loading oil cylinder is arranged at the center of the hydraulic oil cylinder thruster, a linking flange is arranged at the top part of a piston of an oil cylinder, and the flexible force transmission cushion layer is arranged at the bottom of the hydraulic oil cylinder thruster. The device can be widely applied in surface loading of various geomechanical model tests, the device is simple in structure, flexible for assembly and convenient for operation, a single loading unit is reasonable in size, a hydraulic oil cylinder is a two-way oil cylinder with an oil inlet and an oil outlet, and loading and unloading can be realized by matching with a hydraulic station and a hydraulic automatic control system; simultaneously, a plurality of loading devices can be combined by different arrangement ways, thereby realizing gradient loading. The device organically integrates the hydraulic oil cylinder, the rigid thruster and the flexible force transmission rubber cushion layer, thereby greatly reducing the loading space, reducing the size of a reaction frame on a model, saving steel for the reaction frame, and leading the applicability to be stronger.
Description
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Technical field
The present invention relates to a kind of charger, especially a kind of ultrathin flexible well-distributed pressure charger that is applicable to geomechanical model test.
Background technology
Geomechanical model test helps outstanding principal contradiction in the process of the test of complexity, is convenient to hold, find the inner link of phenomenon.Abroad, started engineering geomechanics model test technology with the expert headed by the not graceful Green at Italian structural model test.Subsequently, states such as the U.S., Germany, France, Britain and Japan have also carried out a large amount of model investigations.At home, numerous scientific research institutions such as Tsing-Hua University, three of Headquarters of the General Staff engineer scientific researches, Shandong University have successively carried out geomechanical model test research to domestic many heavy construction projects.
The model boundary loading technique is a key technology in the geomechanical model test, because it is directly connected to model boundary and loads effect and precision, model test is loaded terrestrial stress can real simulation engineering actual forced status play crucial effects, also directly influence the degree of uniformity of formed stress (strain) field in the model body and the authenticity of experimental result.Be warranty test accuracy as a result, the test loading environment of the original terrestrial stress of real simulation is particularly important, therefore, guarantees to produce the uniform stress field in the model, and the scope and the degree of depth that reduce the model surface non-uniform stress field very important to the model test result as far as possible.
From existing model loading technique, the model surface load apply the three kinds of modes that mainly contain:
(1) hydraulic jack loads by the rigidity thruster, and the rigidity thruster can be triangle and divides cloth or trapezoidal profile piece.This method has characteristics such as the load of loading is big, stroke is big, handy, but on-load pressure homogeneity deviation is bigger, causes model internal strain field uniformity very poor, is difficult to reflect strictly according to the facts the engineering stress.Special because the excavation of the middle cavern of model, cause the model boundary distortion inevitable inhomogeneous, this method loads and makes that the unevenness of boundary load is more obvious, also is unfavorable for simultaneously solving loading the synchronous of pressure head and border transversely deforming, so the model boundary loading accuracy is low.
(2) adopt traditional hydraulic rubber capsule to load, can realize the flexible of model surface evenly loaded, particularly when model surface produces nonaffine deformation, still can evenly load.But because the loading load intensity is on the low side, stroke is little, can't satisfy the requirement of model moderate finite deformation and higher-strength, does not reach the heavily stressed loading requirement of deep mining test; Moreover it makes trouble, and serviceable life is short, generally can only satisfy the single test needs.
(3) above dual mode also can solve some engineering problems under the less demanding situation of test accuracy.Along with the expansion gradually of project scale, precision prescribed improves constantly, and these two kinds of load mode exposed day by day go out the drawback of its existence.For addressing the above problem, Headquarters of the General Staff engineer scientific research three is designed piston type well-distributed pressure loader (ZL 02213775.0), both can add evenly load on model, has solved again that flexible force transmission evenly loads a difficult problem in the model test.But piston type well-distributed pressure loader structure more complicated, processing and manufacturing accuracy requirement height, price is also higher relatively.
The model test loading system of the above-mentioned unit of analysis-by-synthesis mainly has the following disadvantages:
1. the rigidity loading system that most loading systems in fact all are hydraulic jack+thrusters, the load deviation is bigger, causes that easily stress is concentrated, can not reach the equally distributed purpose of model surface load.
2. the hydraulic pressure capsule loads owing to have shortcomings such as stroke is little, easy oil leakage, poor durability, the wiring that can only unidirectionally load, is difficult for to bore a hole thereon, can't satisfy the needs of large-scale model test.
3. piston type well-distributed pressure loader complex structure is on the high side, also is unfavorable for burying underground in the model drawing of survey line.
4. most oil cylinder load modes are the form of oil cylinder+thruster, need to reserve bigger loading space, for loading space condition of limited bad adaptability.
Summary of the invention
The objective of the invention is for overcoming above-mentioned the deficiencies in the prior art, a kind of uniform loading performance height is provided, assembles the ultrathin flexible well-distributed pressure charger that is applicable to geomechanical model test flexible, simple to operate, good endurance.
For achieving the above object, the present invention adopts following technical proposals:
A kind of ultrathin flexible well-distributed pressure charger that is applicable to geomechanical model test, comprise the hydraulic jack thruster, hydraulic jack thruster center is provided with two-way load cylinder, and two-way load cylinder top land is provided with joint flange, and hydraulic jack thruster bottom is provided with the flexible force transmission bed course.
Described hydraulic jack thruster comprises upper plate and lower plate, and the upper and lower plates center is provided with two-way load cylinder, connects by some uniform ribbed stiffeners between the upper and lower plate, and ribbed stiffener is trapezoidal.
Described joint flange is connected with piston rod by screw thread, and bolt hole is arranged on the joint flange.
Described flexible force transmission bed course is fixed on the lower plate by superpower viscose, this property power transmission bed course is the flexible polyurethane rubber slab of shore hardness 20 degree, flexible polyurethane rubber slab thickness is 50mm, and outer wrap one deck rubber restraint layer is provided with soft steel wire graticules in the rubber restraint layer.
Comprise the layer of steel wire net in the rubber restraint layer of the present invention, can limit that the flexible rubber layer is out of shape excessive phenomenon under the condition of high voltage.
The peak load that this loading system can apply is 40t, and the accessible peak load intensity of model surface is 4MPa, load intensity deviation≤5%, and the even degree of depth of model surface unbalanced stress is less than 100mm.The present invention can give model surface flexible evenly loading, improves loading accuracy greatly, can be widely used in various geomechanical model tests and load.
The present invention has the following advantages:
1. this device can be realized the flexible well-distributed pressure of model surface is loaded, flexible force transmission bed course superior performance, and the load intensity that applies is big, can reach 4MPa, and the load intensity deviation is lower than 5%, and the even degree of depth of model surface unbalanced stress is less than 100mm.
2. cooperate Hydraulic Station and hydraulic pressure automatic control system, the original stress condition of model engineering geology preferably, the accurate control of implementation model surface stress loads deviation ± 0.1MPa.
3. this device assembling is flexible, and easy to operate, single loading unit size is reasonable, can process the loading unit of different size as required; Can carry out simultaneously different arrangement mode combinations, realize that gradient loads.
4. hydraulic jack, loading thruster, flexible force transmission bed course are organically merged, reduced model reaction frame size greatly, compressed the loading space, saved the reaction frame steel, adaptability is stronger.
5. top land is equipped with link flange, can easily charger be installed on the model reaction frame by flange.
6. a whole set of charger is simple in structure, easy to process, for ease of maintenaince, realizes accurately control load easily, and long service life, and the survey line in the model is drawn in perforation easily.
Description of drawings
Fig. 1 is a cross-sectional view of the present invention;
Fig. 2 is a vertical view of the present invention;
Wherein: 1, joint flange, 2, O-ring seal, 3, ribbed stiffener, 4, load cylinder body, 5, flexible rubber layer, 6, rubber restraint layer, 7, bolt hole, 8, upper plate, 9, oil-out, 10, oil cylinder piston, 11, oil-in, 12, lower plate, 13, the hydraulic jack thruster.
Embodiment
The present invention is further described below in conjunction with drawings and Examples.
As shown in Figure 1 and Figure 2, a kind of ultrathin flexible well-distributed pressure charger that is applicable to geomechanical model test, comprise hydraulic jack thruster 13, hydraulic jack thruster 13 centers are provided with two-way load cylinder, two-way load cylinder top land is provided with joint flange 1, and hydraulic jack thruster 13 bottoms are provided with one deck flexible force transmission bed course.
Hydraulic jack thruster 13 comprises upper plate 8 and lower plate 12, and the upper and lower plates center is provided with two-way load cylinder, connects by some uniform ribbed stiffeners 3 between the upper and lower plate, and ribbed stiffener 3 is trapezoidal.
The flexible force transmission bed course comprises the flexible rubber layer 5 that is arranged at hydraulic jack thruster 13 bottoms and the rubber restraint layer 6 of outer wrap, is provided with the soft steel wire graticules of one deck in the rubber restraint layer 6, can limit the excessive phenomenon of flexible rubber layer 5 distortion under the condition of high voltage.The flexible force transmission bed course is fixed on the lower plate 12 by superpower viscose, and this flexible rubber layer is the flexible polyurethane rubber slab of shore hardness 20 degree, and flexible polyurethane rubber slab thickness is 50mm.
Principle of work of the present invention: cooperate Hydraulic Station and hydraulic pressure automatic control system, hydraulic pressure automatic controlling system hydraulic oil enters load cylinder body 4 bottom cavities shown in Figure 1 by oil-in 11, increase along with pressure, hydraulic oil in the upper chamber is discharged cavity by oil outlet 9, oil cylinder piston 10 promotes hydraulic jack thruster 13 and pushes ahead thereupon, and by joint flange 1 with force transmission on the counter-force structure, thereby obtain reacting force.Reacting force is delivered to power on flexible rubber bed course 5 and the rubber restraint layer 6 by hydraulic jack thruster 13, finally acts on to load on the object.Adjust loading system by the pressure of regulating turnover oil and act on pressure on the object.
The peak load that this loading system can apply is 40t, and the accessible peak load intensity of model surface is 4MPa, load intensity deviation≤5%, and the even degree of depth of model surface unbalanced stress is less than 100mm.The present invention can be widely used in various geomechanical model tests and load.
Claims (4)
1. ultrathin flexible well-distributed pressure charger that is applicable to geomechanical model test, it is characterized in that: comprise the hydraulic jack thruster, hydraulic jack thruster center is provided with two-way load cylinder, two-way load cylinder top land is provided with joint flange, and hydraulic jack thruster bottom is provided with the flexible force transmission bed course.
2. the ultrathin flexible well-distributed pressure charger that is applicable to geomechanical model test according to claim 1, it is characterized in that: described hydraulic jack thruster comprises upper plate and lower plate, the upper and lower plates center is provided with two-way load cylinder, connect by some uniform ribbed stiffeners between the upper and lower plate, ribbed stiffener is trapezoidal.
3. the ultrathin flexible well-distributed pressure charger that is applicable to geomechanical model test according to claim 1, it is characterized in that: described joint flange is connected with piston rod by screw thread, and bolt hole is arranged on the joint flange.
4. the ultrathin flexible well-distributed pressure charger that is applicable to geomechanical model test according to claim 1, it is characterized in that: described flexible force transmission bed course is fixed on the lower plate by superpower viscose, this property power transmission bed course is the flexible polyurethane rubber slab of shore hardness 20 degree, flexible polyurethane rubber slab thickness is 50mm, outer wrap one deck rubber restraint layer is provided with soft steel wire graticules in the rubber restraint layer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010105894962A CN102012339B (en) | 2010-12-15 | 2010-12-15 | Ultra-thin flexible evenly distributed pressure loading device applicable to geomechanical model tests |
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| CN2010105894962A CN102012339B (en) | 2010-12-15 | 2010-12-15 | Ultra-thin flexible evenly distributed pressure loading device applicable to geomechanical model tests |
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| CN102012339A true CN102012339A (en) | 2011-04-13 |
| CN102012339B CN102012339B (en) | 2012-06-27 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105241757A (en) * | 2015-09-18 | 2016-01-13 | 中国科学院武汉岩土力学研究所 | Uniform load mechanism, three dimensional slope model test load apparatus and three dimensional slope model test load method |
| CN105606456A (en) * | 2016-01-28 | 2016-05-25 | 中国矿业大学 | Test device and test method for simulating mechanics characteristic of surrounding rock on top plate of deep repository |
| CN107505205A (en) * | 2017-08-10 | 2017-12-22 | 山东建筑大学 | Simulate the flexible loading device and method of cylinder anchorage model surface uniform stress |
| CN109269900A (en) * | 2018-09-05 | 2019-01-25 | 同济大学 | A kind of stratum simulation and load testing machine for polycyclic shield tunnel construction |
| CN113607917A (en) * | 2021-07-12 | 2021-11-05 | 中煤科工开采研究院有限公司 | Simple geomechanical model test device for realizing gradual stress loading and use method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105241757A (en) * | 2015-09-18 | 2016-01-13 | 中国科学院武汉岩土力学研究所 | Uniform load mechanism, three dimensional slope model test load apparatus and three dimensional slope model test load method |
| CN105606456A (en) * | 2016-01-28 | 2016-05-25 | 中国矿业大学 | Test device and test method for simulating mechanics characteristic of surrounding rock on top plate of deep repository |
| CN107505205A (en) * | 2017-08-10 | 2017-12-22 | 山东建筑大学 | Simulate the flexible loading device and method of cylinder anchorage model surface uniform stress |
| CN107505205B (en) * | 2017-08-10 | 2023-10-24 | 山东建筑大学 | Flexible loading device and method for simulating uniform stress distribution on surface of cylindrical anchoring model |
| CN109269900A (en) * | 2018-09-05 | 2019-01-25 | 同济大学 | A kind of stratum simulation and load testing machine for polycyclic shield tunnel construction |
| CN109269900B (en) * | 2018-09-05 | 2021-10-08 | 同济大学 | Stratum simulation and loading test device for multi-ring shield tunnel structure |
| CN113607917A (en) * | 2021-07-12 | 2021-11-05 | 中煤科工开采研究院有限公司 | Simple geomechanical model test device for realizing gradual stress loading and use method |
| CN113607917B (en) * | 2021-07-12 | 2023-11-10 | 中煤科工开采研究院有限公司 | Simple geomechanical model test device for realizing gradual stress loading and use method |
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| CN102012339B (en) | 2012-06-27 |
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