CN103645128B - A kind of unsaturation rock-soil material stress infiltration measuring instrument - Google Patents
A kind of unsaturation rock-soil material stress infiltration measuring instrument Download PDFInfo
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- CN103645128B CN103645128B CN201310745506.0A CN201310745506A CN103645128B CN 103645128 B CN103645128 B CN 103645128B CN 201310745506 A CN201310745506 A CN 201310745506A CN 103645128 B CN103645128 B CN 103645128B
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Abstract
The invention discloses a kind of unsaturation rock-soil material stress infiltration measuring instrument, 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, the butt hook other end is connected with the stressed cushion block in the top of weighted platform through aperture 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 servo pressure pump through the aperture on closed container, servo pressure pump is placed on outside closed container, foil gauge and humidity temperature pickup are each passed through aperture on closed container, the vessel filling saturated salt solution are placed in closed container.Structure is simple, and easy to use, multiple functional, measuring accuracy is high, and realize different stress level unsaturation drying and the distortion of moistening process and follow-up of quality and measure, under achieving different saturation, mechanical parameters is determined, is applicable to very much unsaturated soils theory research.
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 determined to provide synchronous, a Measurement accuracy equipment.
Background technology
Unsaturation problem is one of important issue of Geotechnical Engineering, many Geotechnical Engineering disasters and material Non-saturated property closely related, such as soil-slope makes unsaturation part mechanical characteristic weaken gradually and causes unstability due to the change of underground water table, subterranean tunnel causes country rock to produce a large amount of crackle due to the change of humidity seasonal rhythm, makes mechanical characteristic and hydraulic performance weaken and cause danger to engineering safety.At present, the development for saturated soil mechanics of unsaturated soils theory measuring technology is slower.
Unsaturated soils theory measuring 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, there is following result about unsaturation rock-soil material stress-infiltration measuring instrument:
Many researchers propose many solutions on suction control technique: Britain's Imperial College of Science and Technology is at quick high range tensiometer (Soilmatrixsuction:someexamplesofitsmeasurementandapplica tioningeotechnicalengineering [J], Geotechnique, 2003, 53, 241-253) achieve progress, they have developed a kind of miniature pore water pressure sensor, can the suction of below rapid measuring 1500kpa, professor Wang Zhao of Wuhan University succeeded in developing matric suction in-situ measurement device (filter paper method at the scene matric suction measure in application [J], Geotechnical Engineering journal, 2003, 25, 405-408).
The ground moisture situation of people generally or under employing mass measurement determination different saturation, but at present, be all generally for carrying out mass measurement through the ground sample of 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) 1991 years devise a kind of unsaturation permeation test unit, it can ensure the sample not demoulding, the consumption aquifer yield surveyed in process of the test replaces the volume of air flowing through sample, improves and surveys gas volume accuracy.France scholar have developed, and (in porous medium, the image of multiphase porous flow shows the theoretical and experimental investigations [D] of research and relative permeability, 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, be placed in import and the outlet of water, another kind of permeable watertight, be placed in import and the outlet of gas, thus realize independence control and the measurement of water, gas.
But do not retrieve about unsaturation rock-soil material stress-infiltration measuring instrument in existing document at present, the unsaturation infiltration carried out under different stress condition is measured and moisture tracking testing equipment simultaneously.
Summary of the invention
The object of the invention is to there are provided a unsaturation rock-soil material stress-infiltration measuring instrument.This device structure is simple, easy to use, multiple functional, measuring accuracy is high, can realize different stress level unsaturation drying and the distortion of moistening process and follow-up of quality to measure, under can realizing different saturation, mechanical parameters is determined simultaneously, and being applicable to very much unsaturated soils theory research institute need.
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 the 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 ISCO500D servo pressure pump through the aperture II on closed container, ISCO500D servo pressure pump is placed on outside closed container, foil gauge and humidity temperature pickup are each passed through aperture III and aperture IV on closed container and are arranged in closed container, the vessel filling saturated salt solution are placed in closed container.
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 rectangular transparent container, 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
2o one wherein, these salt solusions correspond to different humidity respectively, can realize the change of humidity from 32.5% to 98% by progressively changing salt solusion.
Data acquisition system (DAS) by 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 finally, 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 level, unsaturation drying and moistening process accurately control, and temperature variation controls within 2 ° of C;
2. unsaturation quality of materials tracking measurement under stress level is realized;
3. same sample is realized, 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 the infiltration of a kind of unsaturation rock-soil material stress.
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-second connecting link, 4c-the 3rd connecting link, 5-metal butt hook, the movable force-transmitting piston of 6-; 7-O-ring seal; The stressed oil pocket of 8-; 9-sealed screw; 10-diameter is 1/8 inch metal oil inlet pipe, 11-servo loading pump (ISCO500D forcing pump), 12-saturated salt solution, and it can control the humidity in closed container, 13-vessel; 14-rectangle closed container (600x300x300mm); 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 end is connected with the center of the stressed cushion block 2 in the 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 ISCO500D servo loading pump 11 through the aperture II on closed container 14, ISCO500D servo loading pump 11 is placed on outside closed container 14, foil gauge 17 and humidity temperature pickup 16 are each passed through aperture III and aperture IV on closed container 14 and are arranged in closed container 14, the vessel 13 filling saturated salt solution 12 are placed in closed container 14.
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 5 and has been connected with mass sensor 15, for the whole weighted platform of real-time follow-up and the test sample mass change 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 and servo loading pump 11 are that 1/8 inch metal pipe 10 is connected by sealed screw 9 and a caliber, for the pressure that controls in oil pocket and then be 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 adopting American I SCO, this pump can provide continual and steady pressure, maximum pressure can reach 25MPa, and precision is 0.5% of full scale, and this pump can record the liquid volume maintained into and out of oil pocket in steady pressure process.The Scaime single-point AR sensor of the France that mass sensor 15 adopts, it can record whole weighted platform and sample mass summation, and this sensor is 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 change summation of in-oil cylinder liquid volume, by the accurate recording of ISCO pump into and out of the liquid volume in oil pocket, finally can obtain the true moisture situation of change of sample.
Owing to controlling the factor mainly humidity and temperature of rock-soil material unsaturation process, therefore, devise an airtight transparent vessel 14 of vinyon rectangle (600x300x300mm), it has reserved the passage that 4 apertures are respectively used to import pressure transmission channel metal pipe 10, mass sensor 15 passage 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.Foil gauge 17 adopts the long foil gauge for 5mm of Japanese KYOWA, and its precision is 10
-6.
In order to realize unsaturation process, moisture control system is realized by saturated salt solution, places the vessel 13 containing saturated salt solution 12, for controlling the humidity environment in closed container 14 in closed container 14.Actual humidity controls to have employed different saturated salt solusion (CuSO
45H
2o, ZnSO
47H
2o, NH
4sO
4, NaCl, NaNO
2, CaCl
26H
2o) control, these salt solusions can realize the change of humidity from 32.5% to 98%.
Utilize this equipment to carry out unsaturation test for tonstein, testing program is 40mm for height, and diameter is that the cylindrical sample of 36mm applies 6MPa axle pressure, and carried out drying and watering cycle (humidity change between 98% to 32%) and test.Test findings shows, axle pressure keeps 6MPa two weeks, airtight tank humidity controls and preset value only have 2% deviation, 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 defining this material is 1.0x10
-10m/s.Meanwhile, strain measurement shows its Changing Pattern and mass change and humidity and changes one to one, and therefore, this equipment successfully can carry out the stress-penetration testing of unsaturation rock-soil material, especially for the measurement under condition of high ground stress.
Claims (2)
1. a unsaturation rock-soil material stress infiltration 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 closed container (14) outward, mass sensor (15) is connected with butt hook (5) one end, butt hook (5) other end is connected with the stressed cushion block in the top (2) of weighted platform (1) through the upper aperture I of closed container (14), bottom pressurization cushion block (3) of weighted platform (1) connects the exit of servo loading pump (11), wherein weighted platform (1) passes through head rod, second connecting link, 3rd connecting link connects the stressed cushion block in top (2) and bottom pressurization cushion block (3), 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), the outlet of servo loading pump (11) is through the aperture II on closed container (14), described servo loading pump (11) is ISCO500D forcing pump, servo loading pump (11) is positioned over closed container (14) outward, foil gauge (17) and humidity temperature pickup (16) are each passed through the upper aperture III of closed container (14) and aperture IV and are arranged in closed container (14), the vessel (13) filling saturated salt solution (12) are placed in closed container (14).
2. a kind of unsaturation rock-soil material stress infiltration measuring instrument according to claim 1, 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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| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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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