CN103645128A - Unsaturated rock-soil material stress permeability measuring instrument - Google Patents
Unsaturated rock-soil material stress permeability measuring instrument Download PDFInfo
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- CN103645128A CN103645128A CN201310745506.0A CN201310745506A CN103645128A CN 103645128 A CN103645128 A CN 103645128A CN 201310745506 A CN201310745506 A CN 201310745506A CN 103645128 A CN103645128 A CN 103645128A
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Abstract
The invention discloses an unsaturated rock-soil material stress permeability measuring instrument. A data acquisition system is connected with a servo loading pump, a mass sensor, a temperature-humidity sensor and a strain gauge respectively; the mass sensor is arranged outside a closed container and connected with a connecting hook; the other end of the connecting hook penetrates through a small hole in the closed container and is connected with a stressed cushion block at the upper part of a loading platform; a stressing cushion block at the lower part of the loading platform is connected with the outlet of the servo loading pump; the outlet of the servo loading pump penetrates through the small hole in the closed container and is connected with a servo pressure pump; the servo pressure pump is arranged outside the closed container; the strain gauge and the temperature-humidity sensor respectively penetrate through the small hole in the closed container; a vessel containing a saturated salt solution is arranged inside the closed container. The stress permeability measuring instrument is simple in structure, convenient to use, complete in functions, high in measuring precision, and capable of realizing tracking measurement on deformation and mass of unsaturated drying and wetting processes with different stress levels and determining the mechanical parameters of materials with different saturated degrees, thereby being very suitable for research on unsaturated soil mechanics.
Description
Technical field
The present invention relates to experiment measuring instrument technical field, more specifically relate to a kind of unsaturation rock-soil material stress infiltration measuring instrument, for the parameters such as the distortion of unsaturation rock soil medium, mechanics, infiltration are provided by synchronous, the Measurement accuracy equipment of providing.
Background technology
Unsaturation problem is one of important issue of Geotechnical Engineering, many Geotechnical Engineering disasters and material Non-saturated property are closely related, such as soil-slope causes unstability because the variation of underground water table weakens unsaturation part mechanical characteristic gradually, subterranean tunnel causes country rock to produce a large amount of crackles because humidity seasonal rhythm changes, and mechanical characteristic and hydraulic performance is weakened and engineering safety is caused to danger.At present, the development for saturated soil mechanics of unsaturated soil mechanical test technology is slower.
Unsaturated soil mechanical test technology is mainly limited by the accurate control of suction and the accurate measurement of multi-phase physics amount.According to periodical literature and patent retrieval, about unsaturation rock-soil material stress-infiltration measuring instrument, there is following result:
Many researchers have proposed many solutions in suction control technology: Britain's Imperial College of Science and Technology is at quick high range tensiometer (Soil matrix suction:some examples of its measurement and application in geotechnical engineering [J], Geotechnique, 2003, 53, 241-253) obtained progress, they have researched and developed a kind of miniature pore water pressure sensor, suction that can be below rapid measuring 1500kpa, professor Wang Zhao of Wuhan University has succeeded in developing (the filter paper method application [J] of matric suction in measuring at the scene of matric suction original position measuring equipment, Geotechnical Engineering journal, 2003, 25, 405-408).
People generally still adopt mass measurement method to determine the moisture situation of ground under different saturation, but at present, are all generally to carry out mass measurement for the ground sample through super-dry or moistening process.
The infiltration of unsaturated soil is measured, (the aqueous vapor characteristics of motion of unsaturated soil and the engineering properties study [J] thereof such as Chen Zhenghan, Geotechnical Engineering journal, 1993,15,9-20) within 1991, designed a kind of unsaturation permeation test unit, it can guarantee the not demoulding of sample, aquifer yield in consumption survey process of the test replaces flowing through the volume of air of sample, has improved survey gas volume accuracy.France scholar has developed the (theoretical and experimental investigations [D] of the image of multiphase porous flow demonstration research and relative permeability in porous medium, Beijing Scientific Research Institute of Petroleum Exploration and Development Planning, 1989) a set of One-Dimensional Water, air infiltration stream translocation device, they utilize two kinds of semipermeable partitions, a kind of permeable airtight, the import and the outlet that are placed in water, another kind of permeable watertight, be placed in import and the outlet of gas, thereby realize the independent of water, gas, control and measure.
But, in existing document, not retrieving about unsaturation rock-soil material stress-infiltration measuring instrument at present, the unsaturation infiltration of simultaneously carrying out under different stress conditions is measured and moisture tracking measurement equipment.
Summary of the invention
The object of the invention is to be to provide unsaturation rock-soil material stress-infiltration measuring instrument.This device structure is simple, easy to use, multiple functional, measuring accuracy is high, can realize the dry and moistening process distortion of different stress level unsaturation and follow-up of quality and measure, can realize mechanical parameters under different saturation simultaneously and determine, very applicable unsaturated soil mechanics study is required.
To achieve these goals, the present invention adopts following technical scheme:
A kind of unsaturation rock-soil material stress-infiltration measuring instrument, comprise weighted platform (Fig. 2), servo loading pump, saturated salt solution, closed container, mass sensor, humidity temperature pickup, and data acquisition system (DAS), its annexation is: data acquisition system (DAS) respectively with servo loading pump, mass sensor, humidity temperature pickup is connected with foil gauge, mass sensor is placed in outside closed container, mass sensor is connected with butt hook one end, the butt hook other end is connected with the center of the stressed cushion block in top of weighted platform through aperture I on closed container, the bottom pressurization cushion block of weighted platform connects servo loading delivery side of pump place, servo loading delivery side of pump is connected with ISCO 500D servo pressure pump through the aperture II on closed container, ISCO 500D servo pressure pump is placed on outside closed container, foil gauge and humidity temperature pickup are respectively through aperture III and aperture IV on closed container and be arranged in closed container, in closed container, place the vessel that fill saturated salt solution.
The stressed cushion block in top of weighted platform connects bottom pressurization cushion block by first, second, third metal link rod, bottom pressurization cushion block is provided with movable force-transmitting piston and stressed oil pocket, force-transmitting piston is connected with stressed oil pocket by O-ring seal, and stressed oil pocket is connected with metal tube.
The stressed cushion block in top and bottom pressurization cushion block are triangle metal cushion block.
Closed container is vinyon rectangle transparent vessel, and the aperture on closed container passes through silica gel sealing.
The saturated salt solution of moisture control system is CuSO
45H
2o, ZnSO
47H
2o, NH
4sO
4, NaCl, NaNO
2, CaCl
26H
2wherein a kind of of O, these salt solusions are corresponding different humidity respectively, can realize the variation of humidity from 32.5% to 98% by progressively changing salt solusion.
Data acquisition system (DAS) is passed through pci data capture card, and utilizes LABVIEW to realize the acquisition and processing of data.
In order to ensure test process, whole system temperature constant, except servo pressurization pump, mass sensor and data acquisition system (DAS), all parts are all placed in closed container, and last, whole system is placed in a constant temperature enclosure.
The present invention compared with prior art, has the following advantages and effect:
1. realize different stress levels, unsaturation is dry accurately to be controlled with moistening process, within temperature variation is controlled at 2 ° of C;
2. realize unsaturation quality of materials tracking measurement under stress level;
3. realize same sample, different saturation characteristic of material mechanics Measurement accuracy;
4. system versatility is good, reliability is high, can realize the unsaturation test of DIFFERENT SOIL material.
Accompanying drawing explanation
Fig. 1 is a kind of unsaturation rock-soil material stress infiltration measuring instrument structural representation.
Fig. 2 is that weighted platform front elevational schematic is measured in a kind of unsaturation rock-soil material stress infiltration.
Fig. 3 is along A-A line cut-open view in Fig. 2.
Fig. 4 is along B-B line sectional view in Fig. 2.
Wherein: 1-weighted platform, 2-triangle metal cushion block, 3-bottom pressurization cushion block, 4a-head rod, 4b-the second connecting link, 4c-the 3rd connecting link, 5-metal butt hook, the movable force-transmitting piston of 6-; 7-O-ring seal; 8-stressed oil pocket; 9-sealed screw; 10-diameter is 1/8 inch of metal oil inlet pipe, 11-servo loading pump (ISCO 500D forcing pump), and 12-saturated salt solution, it can control the humidity in closed container, 13-vessel; 14-rectangle closed container (600x300x300 mm); 15-mass sensor (Scaime-AR); 16-humidity temperature pickup (JUMO); 17-foil gauge (KYOWA); 18-data acquisition system (DAS) (PCI capture card and Labview software).
Embodiment
embodiment 1:
Below in conjunction with accompanying drawing, the present invention is described in further detail:
A kind of unsaturation rock-soil material stress infiltration measuring instrument (Fig. 1), comprises weighted platform 1(Fig. 2), servo loading pump 11, saturated salt solution 12, closed container 14, mass sensor 15, humidity temperature pickup 16 and data acquisition system (DAS) 18.Data acquisition system (DAS) 18 respectively with servo loading pump 11, mass sensor 15, humidity temperature pickup 16 is connected with foil gauge 17, mass sensor 15 is placed in outside closed container 14, mass sensor 15 is connected with butt hook 5 one end, butt hook 5 other ends are connected with the center of the stressed cushion block 2 in top of weighted platform 1 through aperture I on closed container 14, the bottom pressurization cushion block 3 of weighted platform 1 connects the exit of servo loading pump 11, the outlet of servo loading pump 11 is connected with ISCO 500D servo loading pump 11 through the aperture II on closed container 14, ISCO 500D servo loading pump 11 is placed on outside closed container 14, foil gauge 17 and humidity temperature pickup 16 are respectively through aperture III and aperture IV on closed container 14 and be arranged in closed container 14, the interior placement of closed container 14 fills the vessel 13 of saturated salt solution 12.
As shown in Figure 2, weighted platform 1 connects the stressed cushion block 2 in top and bottom pressurization cushion block 3 by head rod 4a, the second connecting link 4b, the 3rd connecting link 4c, the center of the stressed cushion block 2 in its middle and upper part has been reserved hook and 5 has been connected with mass sensor 15, the mass change for the whole weighted platform of real-time follow-up and test sample at unsaturation test process; Bottom pressurization cushion block 3 comprises movable force-transmitting piston 6, O-ring seal 7 and stressed oil pocket 8, wherein stressed oil pocket 8 is that 1/8 inch of metal tube 10 is connected with servo loading pump 11 by sealed screw 9 and a caliber, for controlling the pressure in oil pocket and then being applied to sample end by force-transmitting piston.The quality of whole weighted platform is 620g, if place ground sample, whole system quality is no more than 1kg.
Servo loading pump 11 is the 500D type force (forcing) pumps that adopt American I SCO, this pump can provide continual and steady pressure, maximum pressure can reach 25MPa, and precision is full scale 0.5%, and this pump can record the liquid volume maintaining in steady pressure process into and out of oil pocket.The French Scaime single-point AR sensor that mass sensor 15 adopts, it can record whole weighted platform and sample mass summation, and this sensor maximum is weighed as 1.2kg, and precision is 0.1g.The mass change of this mass sensor record is actual is the water cut of sample and the variation summation of in-oil cylinder liquid volume, and the accurate recording by ISCO pump, into and out of the liquid volume in oil pocket, can finally obtain the true moisture situation of change of sample.
Owing to controlling the factor of rock-soil material unsaturation process, it is mainly humidity and temperature, therefore, designed the airtight transparent vessel 14 of a vinyon rectangle (600x300x300 mm), it has reserved the passage that 4 apertures are respectively used to import pressure transmission passage metal tube 10, mass sensor 15 passages and humidity temperature pickup 16 and foil gauge 17.Humidity temperature pickup 16 adopts 901350/33 type of German JUMO, and wherein the measuring accuracy of humidity is 1%, and temperature measurement accuracy is 0.1 ° of C.It is the foil gauge of 5mm that foil gauge 17 adopts Japanese KYOWA length, and its precision is 10
-6.
In order to realize unsaturation process, moisture control system realizes by saturated salt solution, and the vessel 13 that the interior placement of closed container 14 contains saturated salt solution 12, for controlling the humidity environment in closed container 14.Actual humidity is controlled and has been adopted different saturated salt solusion (CuSO
45H
2o, ZnSO
47H
2o, NH
4sO
4, NaCl, NaNO
2, CaCl
26H
2o) control, these salt solusions can be realized the variation of humidity from 32.5% to 98%.
Utilize this equipment to carry out unsaturation test for tonstein, testing program is to be 40mm for height, and the cylindrical sample that diameter is 36mm applies 6MPa axle pressure, and has carried out drying and watering cycle (humidity changes between 98% to 32%) test.Test findings shows, axle pressure keeps 6MPa two weeks, and in airtight tank, humidity is controlled with preset value and only had 2% deviation, and mass change can real-time follow-up, and last measuring accuracy is 0.1g.By this mass change and Fick diffusion equation, the diffusion of moisture coefficient of having determined this material is 1.0x10
-10m/s.Meanwhile, strain measurement shows that its Changing Pattern and mass change and humidity change one to one, and therefore, this equipment can successfully carry out the stress-penetration testing of unsaturation rock-soil material, especially for the measurement under condition of high ground stress.
Claims (3)
1. a unsaturation rock-soil material stress permeates measuring instrument, comprise weighted platform (1), servo loading pump (11), saturated salt solution (12), closed container (14), mass sensor (15), humidity temperature pickup (16), data acquisition system (DAS) (18), it is characterized in that: data acquisition system (DAS) (18) respectively with servo loading pump (11), mass sensor (15), humidity temperature pickup (16) is connected with foil gauge (17), mass sensor (15) is placed in outside closed container (14), mass sensor (15) is connected with butt hook (5) one end, butt hook (5) other end is connected with the stressed cushion block in top (2) of weighted platform (1) through the upper aperture I of closed container (14), the bottom pressurization cushion block (3) of weighted platform (1) connects the exit of servo loading pump (11), the outlet of servo loading pump (11) is connected with ISCO 500D servo loading pump (11) through the aperture II on closed container (14), outside ISCO 500D servo loading pump (11) placement and closed container (14), foil gauge (17) and humidity temperature pickup (16) pass respectively closed container (14) upper aperture III and aperture IV and are arranged in closed container (14), in closed container (14), place the vessel (13) that fill saturated salt solution (12).
2. a kind of unsaturation rock-soil material stress according to claim 1 permeates measuring instrument, it is characterized in that: described weighted platform (1) connects the stressed cushion block in top (2) and bottom pressurization cushion block (3) by head rod (4a), the second connecting link (4b), the 3rd connecting link (4c), and the center of the stressed cushion block in its middle and upper part (2) has been reserved hook (5) and has been connected with mass sensor (15).
3. a kind of unsaturation rock-soil material stress according to claim 1 permeates measuring instrument, it is characterized in that: described bottom pressurization cushion block (3) comprises movable force-transmitting piston (6), O-ring seal (7) and stressed oil pocket (8), and wherein stressed oil pocket (8) is connected with metal tube (10) by sealed screw (9) with servo loading pump (11).
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Cited By (11)
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| CN106018026A (en) * | 2016-05-26 | 2016-10-12 | 大连理工大学 | Air humidification device applied to determination of soil-air distribution coefficient of semi-volatile organic contaminants |
| CN106595918A (en) * | 2016-11-17 | 2017-04-26 | 中国科学院武汉岩土力学研究所 | Long-term monitoring apparatus and method for soil pressure outside duct piece of shield tunnel |
| CN107247010A (en) * | 2017-05-16 | 2017-10-13 | 浙江工业大学 | Method and experimental rig for determining oxygen diffusion coefficient in cement-based material under different humidity |
| CN108088860A (en) * | 2018-01-29 | 2018-05-29 | 中国科学院武汉岩土力学研究所 | A kind of ground Seepage-stress coupling analysis system and its control method |
| CN108287128A (en) * | 2018-01-29 | 2018-07-17 | 中国科学院武汉岩土力学研究所 | A kind of ground drying and watering cycle permeability measurement systems and its method |
| CN108333196A (en) * | 2018-01-29 | 2018-07-27 | 中国科学院武汉岩土力学研究所 | A kind of ground water sensitivity analysis system and its control method |
| CN109001098A (en) * | 2018-08-07 | 2018-12-14 | 西南大学 | A kind of instantaneous Penetration Signature tester of soil and soil infiltration characteristics calculation method |
| CN110568151A (en) * | 2019-08-05 | 2019-12-13 | 中交天津港湾工程研究院有限公司 | Measuring method for measuring unsaturated soil matrix suction in centrifugal model test |
| CN111337320A (en) * | 2020-02-28 | 2020-06-26 | 浙江工业大学 | Test device and test method capable of automatically preparing specific saturation test piece |
| CN111766168A (en) * | 2020-06-24 | 2020-10-13 | 中国石油天然气股份有限公司 | Elastic performance evaluation device for particle profile control agent |
| CN113514629A (en) * | 2021-05-19 | 2021-10-19 | 北京航空航天大学 | Method for measuring unsaturated soil matrix suction based on relative humidity of soil body pore gas |
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Cited By (16)
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|---|---|---|---|---|
| CN106018026A (en) * | 2016-05-26 | 2016-10-12 | 大连理工大学 | Air humidification device applied to determination of soil-air distribution coefficient of semi-volatile organic contaminants |
| CN106595918A (en) * | 2016-11-17 | 2017-04-26 | 中国科学院武汉岩土力学研究所 | Long-term monitoring apparatus and method for soil pressure outside duct piece of shield tunnel |
| CN106595918B (en) * | 2016-11-17 | 2018-12-11 | 中国科学院武汉岩土力学研究所 | A kind of long term monitoring device and method of the outer soil pressure of duct pieces of shield tunnel |
| CN107247010B (en) * | 2017-05-16 | 2023-06-27 | 浙江工业大学 | Method and test device for determining oxygen diffusion coefficient in cement-based material |
| CN107247010A (en) * | 2017-05-16 | 2017-10-13 | 浙江工业大学 | Method and experimental rig for determining oxygen diffusion coefficient in cement-based material under different humidity |
| CN107247010B9 (en) * | 2017-05-16 | 2024-02-09 | 浙江工业大学 | Method and device for measuring oxygen diffusion coefficient in cement-based material under different humidity |
| CN108088860A (en) * | 2018-01-29 | 2018-05-29 | 中国科学院武汉岩土力学研究所 | A kind of ground Seepage-stress coupling analysis system and its control method |
| CN108287128A (en) * | 2018-01-29 | 2018-07-17 | 中国科学院武汉岩土力学研究所 | A kind of ground drying and watering cycle permeability measurement systems and its method |
| CN108333196A (en) * | 2018-01-29 | 2018-07-27 | 中国科学院武汉岩土力学研究所 | A kind of ground water sensitivity analysis system and its control method |
| CN109001098A (en) * | 2018-08-07 | 2018-12-14 | 西南大学 | A kind of instantaneous Penetration Signature tester of soil and soil infiltration characteristics calculation method |
| CN109001098B (en) * | 2018-08-07 | 2020-02-21 | 西南大学 | Soil instantaneous permeability characteristic tester and soil permeability characteristic calculation method |
| CN110568151A (en) * | 2019-08-05 | 2019-12-13 | 中交天津港湾工程研究院有限公司 | Measuring method for measuring unsaturated soil matrix suction in centrifugal model test |
| CN111337320A (en) * | 2020-02-28 | 2020-06-26 | 浙江工业大学 | Test device and test method capable of automatically preparing specific saturation test piece |
| CN111337320B (en) * | 2020-02-28 | 2024-06-11 | 浙江工业大学 | Test device and test method capable of automatically preparing test piece with specific saturation |
| CN111766168A (en) * | 2020-06-24 | 2020-10-13 | 中国石油天然气股份有限公司 | Elastic performance evaluation device for particle profile control agent |
| CN113514629A (en) * | 2021-05-19 | 2021-10-19 | 北京航空航天大学 | Method for measuring unsaturated soil matrix suction based on relative humidity of soil body pore gas |
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