CN110082388B - Triaxial test device and method capable of measuring heat conductivity coefficient and permeability coefficient - Google Patents
Triaxial test device and method capable of measuring heat conductivity coefficient and permeability coefficient Download PDFInfo
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- CN110082388B CN110082388B CN201910261696.6A CN201910261696A CN110082388B CN 110082388 B CN110082388 B CN 110082388B CN 201910261696 A CN201910261696 A CN 201910261696A CN 110082388 B CN110082388 B CN 110082388B
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- 238000012360 testing method Methods 0.000 title claims abstract description 49
- 230000035699 permeability Effects 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000002689 soil Substances 0.000 claims abstract description 102
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 72
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 10
- 239000000523 sample Substances 0.000 claims description 154
- 229920001971 elastomer Polymers 0.000 claims description 55
- 239000004575 stone Substances 0.000 claims description 22
- 238000009529 body temperature measurement Methods 0.000 claims description 15
- 239000012528 membrane Substances 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 12
- 239000012530 fluid Substances 0.000 claims description 10
- 230000000087 stabilizing effect Effects 0.000 claims description 9
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 238000009738 saturating Methods 0.000 claims description 2
- 230000003204 osmotic effect Effects 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003032 molecular docking Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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Abstract
The invention provides a triaxial test device capable of measuring thermal conductivity and permeability, which determines a method for realizing permeability by comparing the water head environment of a triaxial soil sample and establishing the pressure balance relationship between a pressure chamber and a sample to be measured, and realizes direct test of the thermal conductivity by adopting a comparison method and a corrected comparison method. Meanwhile, an implementation method of the triaxial test device capable of measuring the thermal conductivity and the permeability is provided. The device has the advantages of clear principle and simple and convenient operation, realizes the measurement of different physical and mechanical parameters in the same instrument and the same soil sample, can be used for the test of the thermal conductivity coefficient of the soil body and the test of the permeability coefficient of the saturated soil, and can provide convenience for the test of the water-heat-force parameters of the soil body.
Description
Technical Field
The invention belongs to the field of geotechnical test calculation, and relates to a triaxial test device capable of measuring a thermal conductivity coefficient and a permeability coefficient and an implementation method thereof, which can be used for performing a thermal conductivity coefficient test on a soil body and a permeability coefficient test on saturated soil.
Background
The water guide performance and the heat conduction performance of the soil body pore structure have a foundation effect on the construction of energy piles and ground source heat pumps in energy geotechnical engineering. The mechanical and thermal properties of the soil body under different states are obviously different, the heat conductivity coefficient and the permeability coefficient of different soil bodies in a triaxial test are researched, and the method has reference significance for solving the multi-field coupling problem in soil mechanics and avoiding the engineering problem. Triaxial test, permeability coefficient test, thermal conductivity coefficient test and the like are conventional choices for determining soil physical strength-water-heat indexes, and the mode of widely taking undisturbed samples wastes manpower and material resources and greatly tests the docking capacity among different test operators. In order to reduce the difficulty in sampling an undisturbed sample and reduce the equipment acquisition cost, different physical and mechanical parameters are needed to be measured in the same instrument and the same soil sample in an integrated mode, so that the test precision of the test is improved, and the economic investment in the soil test is reduced.
Disclosure of Invention
1. Objects of the invention
The invention provides a triaxial test device capable of measuring a thermal conductivity coefficient and a permeability coefficient and an implementation method thereof, which are used for measuring different physical and mechanical parameters in the same instrument and the same soil sample.
2. The technical scheme adopted by the invention
The invention provides a triaxial test device capable of measuring a heat conductivity coefficient and a permeability coefficient, which comprises a pressure chamber, a loading rod, a special function loading cap, a sample base, an upper permeable stone, a lower permeable stone, a rubber membrane wrapped soil sample, confining pressure control equipment and temperature acquisition equipment, wherein the special function loading cap is used for transmitting data measured by a micro temperature measuring probe, a micro soil sample temperature measuring probe and a pressure chamber temperature measuring probe to the temperature acquisition equipment through a temperature measuring data line; the miniature soil sample temperature measuring probe penetrates through a pressure stabilizing water sump, a water pressure cap, a fine permeable cover plate and a permeable stone which are sequentially arranged from top to bottom, and then is arranged in a rubber membrane wrapped soil sample, and a water supply pipe is connected with the pressure stabilizing water sump; the pressure chamber temperature measuring probe is arranged on the upper part of the loading cap with the special function; the miniature temperature measuring probe is arranged at the upper part of the pressure stabilizing water sump; adjust confining pressure controlgear of confining pressure temperature places the permeable stone in the upper and lower end of rubber membrane parcel soil sample, and on the sample base in the pressure chamber was arranged in to the rubber membrane parcel soil sample that will place the permeable stone, arrange the upper portion of permeable stone on the rubber membrane parcel soil sample in with special function loading cap, be connected the upper end of loading pole with special function loading cap, fill water in with the pressure chamber through confining pressure controlgear.
Furthermore, a drain pipe, a confining pressure pipe, a circulating confining pressure pipe, a confining pressure sensor and a fluid pressure sensor are arranged in the sample base; and respectively connecting confining pressure control equipment with a confining pressure pipe and a confining pressure sensor.
Furthermore, the device also comprises a water quantity metering device and a back pressure control device, wherein the water quantity metering device is connected with a water supply pipe of the loading cap with the special function, the back pressure control device is respectively connected with the fluid pressure sensor and the drain pipe, and the circulating confining pressure pipe is connected with the confining pressure control device.
Furthermore, 2 micro temperature measuring probes in the special function loading cap are symmetrically arranged in the special function loading cap; the miniature soil sample temperature probe is 2, and the symmetry passes the permeable stone.
The invention provides a triaxial test method capable of measuring heat conductivity coefficient, which comprises the following steps:
1) according to the triaxial test device, the confining pressure pipe and the circulating confining pressure pipe which are communicated with the pressure chamber adjust the temperature of the liquid in the pressure chamber, so that the temperature difference between the temperature of the liquid in the pressure chamber and the temperature of the soil sample wrapped by the rubber film is 2-5 ℃;
2) the temperature acquisition equipment records the temperature value of a temperature measurement probe of the pressure chamber;
3) the temperature values of the left miniature temperature measuring probe and the right miniature temperature measuring probe in the special function loading cap are recorded by using temperature acquisition equipment and are respectively recorded as TL、TR(ii) a Recording temperature values of the left miniature soil sample temperature measuring probe and the right miniature soil sample temperature measuring probe in the soil sample wrapped by the rubber film by using temperature acquisition equipment, and recording the temperature values as TsL、TsR；
4) When the temperature of the liquid in the pressure chamber is greater than or equal to 0 ℃ and less than 100 ℃, the thermal conductivity can be calculated according to the formula (1), and when the temperature of the liquid in the pressure chamber is less than 0 ℃ and greater than-20 ℃, the thermal conductivity can be calculated according to the formula (2), wherein the formula (1) and the formula (2) are respectively:
in the formula, λ0A thermal conductivity value of the loading cap for a particular function; t isfThe temperature value is the temperature value of the temperature measuring probe of the pressure chamber; t isLLoading the temperature value of the miniature temperature measuring probe on the left side in the cap for a special function; t isRLoading the temperature value of the miniature temperature measuring probe on the right side in the cap for special functions; t issLWrapping the temperature value of the miniature soil sample temperature measuring probe on the left side in the soil sample by using a rubber film; t issRWrapping the temperature value of the miniature soil sample temperature measuring probe on the right side in the soil sample by using a rubber film; t isHIs the equivalent temperature value of latent heat generated by the heat exchange between the pressure chamber and the soil sample wrapped by the rubber film, and when the initial temperature of the pressure chamber is higher than the temperature of the soil sample wrapped by the rubber film, the temperature THIs positive when the initial temperature of the pressure chamber is lower than the temperature of the rubber membrane wrapping the soil sampleHIs negative.
The invention provides a triaxial test method capable of measuring permeability coefficient, which comprises the following steps:
1) according to the triaxial test device, the rubber membrane wrapped soil sample is saturated through a water supply pipe by using water metering equipment;
2) inputting a stable water head quantity H to the rubber film wrapped soil sample by utilizing water quantity metering equipment through a water supply pipe, and adjusting the reading sizes of a confining pressure sensor and a fluid pressure sensor to be consistent by adopting confining pressure control equipment externally connected with a confining pressure pipe;
3) the water displacement of the rubber membrane wrapped soil sample in the ts is recorded through the back pressure control equipment, the permeability coefficient of the triaxial soil sample in a saturated state is calculated through a formula (3), and the formula (3) is as follows:
in the formula (3), ksThe permeability coefficient of the triaxial soil sample in a saturated state is shown; q is the displacement of the drain pipe in ts; l is the height of the rubber film wrapping the soil sample; a is the radial section area of the soil sample wrapped by the rubber film; h is the stable water head amount of water quantity metering equipment input to the rubber membrane wrapping soil sample through a water supply pipe.
3. The invention has the advantages of
The invention provides a triaxial test device capable of measuring a thermal conductivity and a permeability and an implementation method thereof, which can be used for a thermal conductivity test of a soil body and a permeability test of saturated soil. The device has clear principle, the method is simple and convenient to operate, and different physical and mechanical parameters can be measured in the same instrument and the same soil sample. The method can provide convenience for testing the water-heat-force parameters of the soil body.
Drawings
FIG. 1 is an effect diagram of a triaxial test apparatus capable of measuring thermal conductivity and permeability according to the present invention;
in the figure: 1. the pressure chamber 2, the loading rod 3, the special function loading cap 4, the sample base 51, the upper permeable stone and the lower permeable stone 52; 6. the soil sample 7 is wrapped by a rubber film, the confining pressure control device 8, the water quantity metering device 9, the back pressure control device 10, the temperature acquisition device 31, the miniature temperature measurement probe 32, the miniature soil sample temperature measurement probe 33, the temperature measurement data line 34, the water pressure cap 35, the pressure stabilization water sump 36, the water supply pipe 37, the fine water permeable cover plate 38, the pressure chamber temperature measurement probe 41, the water discharge pipe 42, the confining pressure pipe 43, the circulating confining pressure pipe 44, the confining pressure sensor 45 and the fluid pressure sensor
Detailed Description
The invention discloses a triaxial test device capable of measuring thermal conductivity and permeability coefficient and an implementation method thereof, which are described in the accompanying drawings.
The invention relates to a triaxial test device capable of measuring thermal conductivity and permeability and an implementation method thereof, wherein the triaxial test device is based on the following steps: the method for realizing the permeability coefficient is determined by comparing the water head environment of the triaxial soil sample and establishing the balance relation between the pressure chamber and the pressure of the sample to be tested, and the direct test of the heat conductivity coefficient is realized by adopting a comparison method and a corrected comparison method.
The invention discloses a triaxial test device capable of measuring thermal conductivity and permeability and an implementation method thereof, which are realized as follows:
the triaxial test device capable of measuring the thermal conductivity and the permeability coefficient is provided, as shown in fig. 1, and is characterized in that: the test device comprises a pressure chamber 1, a loading rod 2, a special function loading cap 3, a sample base 4, an upper permeable stone 51, a lower permeable stone 52, a rubber membrane wrapped soil sample 6, confining pressure control equipment 7, water quantity metering equipment 8, back pressure control equipment 9 and temperature acquisition equipment 10; the special function loading cap 3 comprises a micro temperature measuring probe 31, a micro soil sample temperature measuring probe 32, a temperature measuring data line 33, a water pressure cap 34, a pressure stabilizing water sump 35, a water supply pipe 36, a fine water permeable cover plate 37 and a pressure chamber temperature measuring probe 38, a drain pipe 41, a confining pressure pipe 42, a circulating confining pressure pipe 43, a confining pressure sensor 44 and a fluid pressure sensor 45 are arranged in the sample base 4, the confining pressure control device 7 has the function of regulating the confining pressure temperature, permeable stones are placed at the upper end and the lower end of the rubber film wrapped soil sample 6, the rubber film wrapped soil sample 6 with the permeable stones and the sample base 4 arranged in the pressure chamber 1 are placed, the special function loading cap 3 is placed on the upper part of the permeable stones 51 on the rubber film wrapped soil sample 6, the loading rod 2 is connected with the upper end of the special function loading cap 3, the confining pressure control device 7 is respectively connected with the confining pressure pipe 42 and the confining pressure sensor 44 through a three-way pipe, the water quantity metering device 8 is connected with a water supply pipe 36 of the loading cap 3 with a special function, the back pressure control device 9 is respectively connected with a fluid pressure sensor 45 and a water discharge pipe 41 through a three-way pipe, the temperature acquisition device 10 is connected with a temperature measurement data line 33 data line, the pressure chamber 1 is filled with water through the confining pressure control device 7, and the circulating confining pressure pipe 43 is connected with the confining pressure control device 7, so that the triaxial test device capable of measuring the heat conductivity coefficient and the permeability coefficient is formed.
In the special function loading cap 3, 2 miniature temperature measuring probes 31 are symmetrically arranged in the special function loading cap 3, a water supply pipe 36 is connected with a pressure stabilizing water sump 35, the pressure stabilizing water sump 35 is connected with a water pressure cap 34, a fine water permeable cover plate 37 is connected with the water pressure cap 34, 2 miniature soil sample temperature measuring probes 32 penetrate through the fine water permeable cover plate 37 and penetrate through an upper water permeable stone 51 to be arranged in a rubber film wrapped soil sample 6, and a pressure chamber temperature measuring probe 38 is arranged at the upper part of the special function loading cap 3, so that the special function loading cap 3 is formed;
a heat conductivity coefficient test realization method of a triaxial test device capable of measuring heat conductivity coefficient and permeability coefficient comprises the following implementation steps:
1) the triaxial test device capable of measuring the heat conductivity coefficient and the permeability coefficient is assembled, and the confining pressure pipe 42 and the circulating confining pressure pipe 43 which are communicated with the pressure chamber 1 are adopted to adjust the temperature of liquid in the pressure chamber 1, so that the temperature difference of 2-5 ℃ exists between the temperature of the liquid in the pressure chamber 1 and the temperature of the soil sample 6 wrapped by the rubber film;
2) the temperature acquisition equipment 10 connected with the temperature measurement data line 33 is started, the temperature value of the temperature measurement probe 38 of the pressure chamber is recorded by the temperature acquisition equipment 10 and is recorded as Tf(ii) a The temperature acquisition equipment 10 is used for recording the temperature values of the left miniature temperature measurement probe 31 and the right miniature temperature measurement probe 31 in the special function loading cap 3, and the temperature values are respectively recorded as TL、TR(ii) a The temperature acquisition equipment 10 is utilized to record the temperature values of the left miniature soil sample temperature measurement probe 32 and the right miniature soil sample temperature measurement probe 32 in the soil sample 6 wrapped by the rubber film, and the temperature values are respectively recorded as TsL、TsR；
3) When the temperature of the liquid in the pressure chamber 1 is greater than or equal to 0 ℃ and less than 100 ℃, the thermal conductivity can be calculated according to the formula (1), and when the temperature of the liquid in the pressure chamber 1 is less than 0 ℃ and greater than-20 ℃, the thermal conductivity can be calculated according to the formula (2), wherein the formula (1) and the formula (2) are respectively:
in the formula, λ0The thermal conductivity value of the loading cap 3 for the special function; t isfThe temperature value of the pressure chamber temperature measurement probe 38; t isLLoading the temperature value of the miniature temperature probe 31 on the left side in the cap 3 for a special function; t isRLoading the temperature value of the miniature temperature measuring probe 31 on the right side in the cap 3 for special functions; t issLThe temperature value of the miniature soil sample temperature measuring probe 32 at the left side in the soil sample 6 is wrapped by the rubber film; t issRThe temperature value of the miniature soil sample temperature measuring probe 32 on the right side in the soil sample 6 is wrapped by the rubber film; t isHIs the equivalent temperature value of latent heat generated by the heat exchange between the pressure chamber 1 and the rubber film wrapped soil sample 6, and when the initial temperature of the pressure chamber 1 is higher than the temperature of the rubber film wrapped soil sample 6, the temperature THIs positive, when the initial temperature of the pressure chamber 1 is lower than the temperature of the rubber film wrapping the soil sample 6HIs a negative value;
a method for realizing permeability coefficient test of a triaxial test device capable of measuring thermal conductivity and permeability coefficient comprises the following implementation steps:
1) assembling a triaxial test device capable of measuring the heat conductivity coefficient and the permeability coefficient, and saturating the rubber membrane-coated soil sample 6 through a water supply pipe 3 by using a water metering device 8;
2) inputting a stable water head quantity H to the rubber film wrapped soil sample 6 through a water supply pipe 36 by using a water quantity metering device 8, and adjusting the reading sizes of a confining pressure sensor 44 and a fluid pressure sensor 45 to be consistent by using a confining pressure control device 7 externally connected with a confining pressure pipe 42;
3) the water displacement of the rubber membrane wrapped soil sample 6 in ts is recorded through the back pressure control equipment 9, the permeability coefficient of the triaxial soil sample in a saturated state is calculated through a formula (3), and the formula (3) is as follows:
in the formula (3), ksThe permeability coefficient of the triaxial soil sample in a saturated state is shown; q is the displacement of the drain pipe 41 in ts; l is the height of the soil sample 6 wrapped by the rubber film; a is the radial section area of the soil sample 6 wrapped by the rubber film; and H is the stable water head input to the rubber film wrapped soil sample 6 by the water quantity metering device 8 through the water supply pipe 36.
The above description is only for the purpose of illustration in conjunction with the present manufacturing process, and the present invention may be subject to various changes and modifications for practical application in the art. All changes, equivalents, modifications and the like which come within the spirit and principle of the invention are desired to be protected.
Claims (5)
1. The utility model provides a but triaxial test device of survey coefficient of heat conductivity and osmotic coefficient, pressure chamber (1), loading pole (2), special function loading cap (3), sample base (4), go up permeable stone (51), lower permeable stone (52), rubber membrane parcel soil sample (6), confined pressure controlgear (7), temperature acquisition equipment (10), its characterized in that: the special function loading cap (3) transmits data measured by the micro temperature measuring probe (31), the micro soil sample temperature measuring probe (32) and the pressure chamber temperature measuring probe (38) to the temperature acquisition equipment (10) through a temperature measuring data line (33); the miniature soil sample temperature measuring probe (32) penetrates through a pressure stabilizing water sump (35), a water pressure cap (34), a fine water permeable cover plate (37) and an upper permeable stone (51) which are sequentially arranged from top to bottom, and then is arranged in a soil sample (6) wrapped by a rubber membrane, and a water supply pipe (36) is connected with the pressure stabilizing water sump (35); the pressure chamber temperature measuring probe (38) is arranged on the upper part of the special function loading cap (3); the miniature temperature measuring probe (31) is arranged at the upper part of the pressure stabilizing water sump (35); confining pressure control equipment (7) for adjusting confining pressure temperature, placing permeable stones at the upper end and the lower end of a rubber membrane-wrapped soil sample (6), placing the rubber membrane-wrapped soil sample (6) with the permeable stones placed on a sample base (4) in a pressure chamber (1), placing a special function loading cap (3) on the upper part of the permeable stones (51) on the rubber membrane-wrapped soil sample (6), connecting a loading rod (2) with the upper end of the special function loading cap (3), and filling water into the pressure chamber (1) through the confining pressure control equipment (7);
the method is characterized by comprising the following steps:
1) a surrounding pressure pipe (42) and a circulating surrounding pressure pipe (43) which are communicated with the pressure chamber (1) adjust the temperature of the liquid in the pressure chamber (1) to ensure that the temperature of the liquid in the pressure chamber (1) and the temperature of the soil sample (6) wrapped by the rubber film have a temperature difference of 2-5 ℃;
2) the temperature acquisition equipment (10) records the temperature value of the pressure chamber temperature measurement probe (38);
3) temperature values of a left miniature temperature measuring probe (31) and a right miniature temperature measuring probe (31) in the special function loading cap (3) are recorded by using temperature acquisition equipment (10) and are respectively recorded as TL、TR(ii) a Temperature values of the left miniature soil sample temperature measuring probe (32) and the right miniature soil sample temperature measuring probe (32) in the soil sample (6) wrapped by the rubber film are recorded by using the temperature acquisition equipment (10) and are respectively recorded as TsL、TsR；
4) When the temperature of the liquid in the pressure chamber (1) is more than or equal to 0 ℃ and less than 100 ℃, the heat conductivity coefficient can be calculated according to the formula (1), and when the temperature of the liquid in the pressure chamber (1) is less than 0 ℃ and more than-20 ℃, the heat conductivity coefficient can be calculated according to the formula (2), wherein the formula (1) and the formula (2) are respectively:
in the formula, λ0The value of the thermal conductivity of the loading cap (3) for the special function; t isfThe temperature value of the pressure chamber temperature measurement probe (38); t isLLoading the temperature value of the miniature temperature measuring probe (31) on the left side in the cap (3) for a special function; t isRThe temperature value of the miniature temperature measuring probe (31) on the right side in the cap (3) is loaded for special functions; t issLThe temperature value of the miniature soil sample temperature measuring probe (32) at the left side in the soil sample (6) is wrapped by the rubber film; t issRThe temperature value of the miniature soil sample temperature measuring probe (32) on the right side in the soil sample (6) is wrapped by the rubber film; t isHIs the equivalent temperature value of latent heat generated by the heat exchange between the pressure chamber (1) and the soil sample (6) wrapped by the rubber film, and when the initial temperature of the pressure chamber (1) is higher than the temperature of the soil sample (6) wrapped by the rubber film, the temperature T isHIs positive, when the initial temperature of the pressure chamber (1) is lower than the temperature of the rubber film wrapping the soil sample (6)HIs negative.
2. The triaxial test apparatus capable of measuring thermal conductivity and permeability as set forth in claim 1, wherein: a drain pipe (41), a confining pressure pipe (42), a circulating confining pressure pipe (43), a confining pressure sensor (44) and a fluid pressure sensor (45) are arranged in the sample base (4); the confining pressure control equipment (7) is respectively connected with a confining pressure pipe (42) and a confining pressure sensor (44).
3. The triaxial test apparatus capable of measuring thermal conductivity and permeability as set forth in claim 2, wherein: the device is characterized by further comprising a water quantity metering device (8) and a back pressure control device (9), wherein the water quantity metering device (8) is connected with a water supply pipe (36) of the special function loading cap (3), the back pressure control device (9) is respectively connected with a fluid pressure sensor (45) and a drain pipe (41), and a circulating confining pressure pipe (43) is connected with a confining pressure control device (7).
4. The triaxial test apparatus capable of measuring thermal conductivity and permeability as set forth in claim 1, wherein: 2 micro temperature probes (31) in the special function loading cap (3) are symmetrically arranged in the special function loading cap (3); the number of the micro soil sample temperature measuring probes (32) is 2, and the probes symmetrically penetrate through the upper permeable stone (51).
5. The triaxial test apparatus capable of measuring thermal conductivity and permeability according to any one of claims 1 to 4, comprising the steps of:
1) saturating the rubber film wrapped soil sample (6) by using a water metering device (8) through a water supply pipe (36);
2) inputting a stable water head quantity H to the rubber film wrapped soil sample (6) by using a water quantity metering device (8) through a water supply pipe (36), and adjusting the reading sizes of a confining pressure sensor (44) and a fluid pressure sensor (45) to be consistent by using a confining pressure control device (7) externally connected with a confining pressure pipe (42);
3) recording the water discharge of a rubber membrane wrapped soil sample (6) in t s through backpressure control equipment (9), and calculating the permeability coefficient of the triaxial soil sample in a saturated state through a formula (3), wherein the formula (3) is as follows:
in the formula (3), ks is a permeability coefficient of the triaxial soil sample in a saturated state; q is the displacement of the drain pipe (41) in t s; l is the height of the rubber film wrapping the soil sample (6); a is the radial section area of the soil sample (6) wrapped by the rubber film; h is the stable water head quantity input to the rubber film wrapped soil sample (6) by the water quantity metering device (8) through a water supply pipe (36).
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| CN112083029B (en) * | 2020-08-13 | 2022-11-25 | 四川士达特种炭材有限公司 | Filler comprehensive performance evaluation device and method |
| CN112798488A (en) * | 2020-12-29 | 2021-05-14 | 苏州汇才土水工程科技有限公司 | Device and method for transient measurement of permeability coefficient |
| CN113702429B (en) * | 2021-07-16 | 2022-06-24 | 浙江大学 | Saturated sandy soil permeability-heat conductivity index testing device and measuring method thereof |
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