CN108760564B - Experimental device for be arranged in testing unsaturated sand gas persistence - Google Patents
Experimental device for be arranged in testing unsaturated sand gas persistence Download PDFInfo
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- CN108760564B CN108760564B CN201810693504.4A CN201810693504A CN108760564B CN 108760564 B CN108760564 B CN 108760564B CN 201810693504 A CN201810693504 A CN 201810693504A CN 108760564 B CN108760564 B CN 108760564B
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- 238000012360 testing method Methods 0.000 title claims abstract description 13
- 230000002688 persistence Effects 0.000 title claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 193
- 239000004576 sand Substances 0.000 claims abstract description 52
- 238000005303 weighing Methods 0.000 claims abstract description 22
- 230000008859 change Effects 0.000 claims abstract description 11
- 230000009467 reduction Effects 0.000 claims abstract description 5
- 238000002347 injection Methods 0.000 claims description 16
- 239000007924 injection Substances 0.000 claims description 16
- 238000003860 storage Methods 0.000 claims description 9
- 238000005192 partition Methods 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims 2
- 239000007788 liquid Substances 0.000 description 23
- 238000000034 method Methods 0.000 description 13
- 238000002474 experimental method Methods 0.000 description 12
- 239000002689 soil Substances 0.000 description 8
- 239000012530 fluid Substances 0.000 description 7
- 241000894006 Bacteria Species 0.000 description 6
- 230000035699 permeability Effects 0.000 description 5
- 238000007789 sealing Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 241000193830 Bacillus <bacterium> Species 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 2
- 235000017491 Bambusa tulda Nutrition 0.000 description 2
- 241001330002 Bambuseae Species 0.000 description 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 2
- 239000011425 bamboo Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 238000009928 pasteurization Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002572 peristaltic effect Effects 0.000 description 1
- 239000004323 potassium nitrate Substances 0.000 description 1
- 235000010333 potassium nitrate Nutrition 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000001632 sodium acetate Substances 0.000 description 1
- 235000017281 sodium acetate Nutrition 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The invention discloses an experimental device for testing the durability of gas in unsaturated sand, which comprises a seepage cylinder, a water head adjusting unit and a weighing unit; the seepage cylinder comprises a cylinder body for containing sand, a top cover for calculating the volume of gas generated after the sand is subjected to saturation reduction treatment, and a bottom cover for reducing the impact of water flow on the sand; the water head adjusting unit comprises a high-level water tank and a low-level water tank which are connected with a top cover and a bottom cover of the seepage cylinder and generate water flow in sand; the seepage cylinder is arranged on the weighing unit, and the mass change of the seepage cylinder is weighed by the weighing unit to calculate the volume of the gas escaping from the sand. The experimental device provided by the invention has the advantages of simple structure and convenience in assembly, can meet the requirement of calculating the saturation change of the sand in the saturation reduction experimental stage, can record the escape amount of the gas in the sand in real time in the gas durability testing stage, and can freely change the seepage length and the seepage path according to the experimental requirement.
Description
Technical Field
The invention relates to an experimental device, in particular to an experimental device suitable for measuring the gas durability in biological desaturation treatment liquefied sand.
Background
The problem of liquefaction of sand foundation is one of important subjects in geotechnical engineering research, and although the traditional methods such as dynamic compaction, gravel pile and cement solidification are effective, the method cannot be used as a treatment method for treating large-area liquefaction of sand foundation due to high construction cost, complex construction technical requirements, poor durability, large environmental hazard and the like, and is not applicable to the treatment of the liquefaction foundation under the established building. At present, a method for injecting a bacterial solution into liquefied sandy soil and inducing bacteria to generate bubbles is adopted by a learner, the sandy soil is subjected to desaturation treatment, and experiments such as a vibrating table and a dynamic triaxial test prove that the method is quite effective. The method has small influence on environment, is green and environment-friendly, and has wide application prospect. However, the problem of gas durability is also faced when the method is popularized to practical application. The sand layer with liquefaction danger is generally located below the ground water line, the ground water is rarely in a completely static state, when water flows, bubbles generated by the desaturation treatment can be gradually dissipated, how to evaluate and improve the durability of the gas in the denitrification sand is a major concern of a plurality of students, however, the conventional seepage device cannot meet the requirements of two processes of the desaturation treatment and the gas durability test.
Disclosure of Invention
The invention aims to: the invention aims to provide an experimental device capable of carrying out desaturation treatment on sandy soil and carrying out gas durability test on the basis of the sandy soil after the disturbance-free treatment.
The technical scheme is as follows: the invention relates to an experimental device for testing the durability of gas in unsaturated sandy soil, which comprises a seepage cylinder, a water head adjusting unit and a weighing unit; the seepage cylinder comprises a cylinder body for containing sand, a top cover for calculating the volume of gas generated after the sand is subjected to saturation reduction treatment, and a bottom cover for reducing the impact of water flow on the sand; the water head adjusting unit comprises a high-level water tank and a low-level water tank which are connected with the top cover and the bottom cover of the seepage cylinder and generate water flow in sand; the seepage cylinder is arranged on the weighing unit, and the mass change of the seepage cylinder is weighed by the weighing unit to calculate the volume of the sand escaping gas.
Preferably, the top cover comprises an exhaust chamber, a measuring chamber and a filter chamber from top to bottom, wherein the top of the exhaust chamber is provided with a connecting port and a water injection hole. Further, the exhaust chamber is conical, a connecting port is formed in the center of the top of the exhaust chamber, a valve is installed, and a water injection hole is formed in the position, deviating from the center of the top, of the exhaust chamber.
The bottom cover comprises a filter chamber and a buffer chamber from top to bottom, wherein the bottom of the buffer chamber is provided with a connecting hole and is provided with a valve.
A fixed base is also arranged between the seepage cylinder and the weighing unit, and a longitudinal cavity or a transverse groove which is used for longitudinally arranging the seepage cylinder is arranged on the fixed base.
When the seepage cylinder is longitudinally arranged on the fixed base, the bottom of the bottom cover is connected with the high-level water tank through a pipeline, the top of the top cover is connected with the low-level water tank through a pipeline, or the bottom of the bottom cover is connected with the low-level water tank through a pipeline, and the top of the top cover is connected with the high-level water tank through a pipeline; when the seepage tube is transversely arranged on the fixed base, the bottom of the bottom cover is connected with the high-level water tank through a pipeline, and the top of the top cover is connected with the low-level water tank through a pipeline.
The water head adjusting unit further comprises a water supply tank, and the high-level water tank and the low-level water tank are connected with the water supply tank through pipelines. Further, overflow partition boards are arranged in the high-level water tank and the low-level water tank to divide the water tank into a water overflow area and a water storage area, and the height of the overflow partition boards is lower than that of the water tank wall. The water head adjusting unit further comprises a support, the support is provided with height scales, and the high-level water tank and the low-level water tank are arranged on the support. The high-level water tank and the low-level water tank are provided with indication arrows, and the height of the indication arrows is the same as that of the overflow baffle.
The beneficial effects are that: compared with the prior art, the experimental device provided by the invention has the advantages that the structure is simple, the assembly is convenient, the requirement of calculating the saturation change of the sand in the desaturation experimental stage can be met, the escape amount of the gas in the sand can be recorded in real time in the gas durability testing stage, the seepage length and the seepage path can be freely changed according to the experimental requirement, and meanwhile, the experimental device has the advantages of low cost and wide applicability.
Drawings
FIG. 1 is an assembled schematic view of an experimental apparatus of the present invention;
FIG. 2 (a) is a schematic structural view of a seepage cartridge;
FIG. 2 (b) is a schematic view of the structure of the top cover;
FIG. 2 (c) is a schematic structural view of the bottom cover;
FIG. 3 (a) is a schematic cross-sectional view of the top cover;
FIG. 3 (b) is a schematic cross-sectional view of the bottom cover;
FIG. 4 (a) is a schematic diagram of the structure of the head tank;
FIG. 4 (b) is a schematic diagram of the structure of the low level cistern;
FIG. 5 is a schematic structural view of a bracket;
FIG. 6 is a schematic structural view of a stationary base;
FIG. 7 is a graph of sample saturation over time;
FIG. 8 is a graph of sample permeability coefficient versus time.
Detailed Description
The technical scheme of the invention is further described below with reference to the accompanying drawings.
As shown in fig. 1,2 (a) -2 (c) and 3 (a) -3 (b), the experimental device of the present invention comprises a seepage cartridge 1, a water head adjusting unit 2 and a weighing unit 3, and the seepage cartridge 1 comprises a cartridge body 101, a top cover 102 and a bottom cover 103. The cylinder 101, the top cover 102 and the bottom cover 103 are connected through flanges, wherein the flanges of the top cover 102 and the bottom cover 103 are provided with annular grooves 114, and sealing rings 110 are placed in the annular grooves 114. Experimental sand is contained in the cylinder 101, and the inner wall of the cylinder is in a frosted form so as to increase seepage resistance between the inner wall and the sand. The top cover is divided into an exhaust chamber 111, a measuring chamber 112 and a filtering chamber 113 from top to bottom, the inner wall of the measuring chamber is marked with volume scales 109, when the sand is subjected to desaturation treatment, the liquid level in the seepage cylinder is positioned near the bottom volume scales of the measuring chamber, the water level can be increased by gas generated in the soil, and the volume of the gas generated by the desaturation treatment can be calculated by calculating the volume increased by the volume scales. The exhaust chamber 111 is conical, a connecting hole penetrating through the top is formed in the geometric center of the measuring top cover, a valve 104 with a quick-plug connector is arranged, a water injection hole is formed in a position deviating from the geometric center, a water injection pipe 106 is arranged, a sealing plug 108 is attached to the water injection pipe, the pipe orifice of the water injection pipe 106 is higher than the quick-plug connector, and after the saturation reduction treatment process is finished, water is added into the seepage cylinder 1 through the water injection pipe 106 until water overflows from the connecting hole, and the seepage cylinder can be filled for the next experiment. The bottom cover 103 is divided into a filtering chamber 113 and a buffer chamber 115 from top to bottom, and the buffer chamber 115 can reduce impact of water flow on experimental sand. Water permeable stones 105 are installed in the filter chambers of the top cover 102 and the bottom cover 103 to prevent the experimental sand from flowing.
The head adjusting unit 2 is composed of a bracket 201, a high level water tank 202, a low level water tank 203, a water supply tank 206, and a water pump 207. As shown in fig. 4 (a) -4 (b), inside the tank there is an overflow partition 204, which is lower than the tank wall and divides the tank into a water storage area and an overflow area. The side wall of the water storage area is provided with a connecting hole and is provided with a valve 104 with a quick-plug interface, and the overflow area is provided with an overflow hole 209. In addition, a water supply hole 212 is formed in the water storage area of the high-level water tank. When the seepage experiment is carried out, the water level in the water storage area of the water tank can be maintained at the top of the overflow baffle plate, so that a constant water head is formed. The back walls of the high level tank and the low level tank extend laterally outward to form side wings, each side wing is provided with two fixing holes 210, and the two holes are positioned on the same straight line in the vertical direction. An indication arrow 211 is arranged on one wing of the water tank, and the height of the indication arrow is the same as the top of the overflow partition. Two vertical strip holes 208 are formed in the support, the width of each strip hole is the same as the diameter of each fixing hole, the distance between the two strip holes is the same as the distance between two rows of fixing holes on the side wings of the water tank, screws penetrate through the fixing holes and the strip holes, nuts are arranged on the other side of the screws, and the water tank can be fixed on the support by tightening the nuts. As shown in fig. 5, the same side of the bracket as the indication arrow 211 is provided with a height scale 205, and the height scale indicated by the indication arrow indicates the water level in the water tank.
As shown in fig. 6, the fixing base 301 is a rectangular prism, a cylindrical cavity slightly larger than the bottom cover of the seepage cylinder is turned longitudinally by taking the axis of the frustum as the axis, a transverse groove 304 with the radius equal to the radius of the cylinder body of the seepage cylinder is turned transversely by taking the axis of the upper surface of the frustum as the axis, and the cylindrical cavity is opened to one side of the frustum in the direction perpendicular to the groove. Four fixing holes 303 are formed around the cylindrical cavity, the positions of the fixing holes correspond to the four holes on the flange of the bottom cover of the seepage cylinder, when the flange is connected with the seepage cylinder in an assembled mode, the corresponding four holes are connected by using special screws 107, the length of the special screws is far greater than the thickness of the flange, and the special screws can be inserted into the four fixing holes after the assembly to fix the seepage cylinder. The fixed base is arranged on the weighing base 302 of the weighing unit, when the gas durability inside the sand is tested by passing water through the sand, the total mass of the sand and the liquid in the seepage cylinder, including the fixed base and the seepage cylinder, is required to be weighed by the weighing base, when the gas escapes from the sand, the mass of the sand can be changed, and the gas escaping amount can be calculated according to the mass change. The flow rate can be calculated by weighing the water quantity flowing out of the low-level water tank in a fixed time, and the permeability coefficient of the sample can be calculated by combining the fixed water head difference and the sample size. In addition, the device can also transversely place the seepage tube in the transverse groove 304, so that a transverse seepage experiment can be carried out.
After the experimental device was assembled, as shown in fig. 1, wherein the water supply hole of the head tank was connected to the water pump through a water pipe. The overflow holes of the high-level water tank and the low-level water tank are connected with water pipes, and the other ends of the water pipes are placed in the water supply tank. When the lateral seepage or upward seepage experiment is carried out, the connecting hole of the seepage barrel bottom cover is connected to the connecting hole of the high-level water tank by using a water pipe, and the connecting hole of the seepage barrel measurement top cover is connected to the connecting hole of the low-level water tank by using a water pipe. When the downward seepage experiment of rivers is carried out, the connecting hole of seepage flow section of thick bamboo bottom uses water piping connection to the connecting hole of low level water tank, and the connecting hole of seepage flow section of thick bamboo measurement top cap needs water piping connection to the connecting hole of high level water tank.
The number and length of the seepage cartridges of the present invention can be increased as desired. The lengths of the sand samples can be increased by connecting a plurality of seepage cylinder bodies together through the flange plates. In addition, a plurality of seepage drums can be connected end to end through a water pipe so as to observe the persistence difference of the gas in the sample when the sample is positioned at different positions of the waterway.
The experimental steps are as follows:
1. Desaturation treated sandy soil sample
(1) The bottom cover of the seepage cylinder is connected with the cylinder body through screws and nuts, wherein four corresponding openings are connected by special screws, a sealing ring is placed in a groove of a flange plate, and the sealing ring is fixed on a fixed base after assembly and a valve on the bottom cover is closed.
(2) And (3) injecting a desaturation treatment fluid (such as a solution containing denitrifying bacteria and necessary substances) into the seepage cylinder, scattering experimental sand, and keeping the sand at the liquid level of the treatment fluid until the sand is filled up, so as to ensure the saturation of the original sample, wherein the liquid level of the treatment fluid is level with the upper end of the cylinder.
(3) Installing a measuring top cover of the seepage tube on the tube body, opening a valve on the top cover, pulling out a hole plug of the water injection tube, filling treatment liquid into the top cover from the water injection tube until a certain volume scale of a liquid level measuring chamber in the top cover is overlapped, and then closing the valve and recording the volume scale corresponding to the liquid level as a.
(4) And (3) placing the sample for a period of time for desaturation treatment, observing and measuring the rise condition of the liquid level in the top cover, wherein the difference value between the corresponding volume scale of the liquid level and a is the volume of gas generated in sand, and performing the next operation when the required value of the experiment is reached.
(5) And (3) opening a valve of the measuring top cover, injecting water into the measuring top cover through a water injection pipe until water overflows from a valve opening, closing the valve, and plugging the water injection pipe by a hole plug.
2. Seepage test
(1) The seepage tube is placed on the weighing base together with the fixed base (the seepage tube is required to be horizontally arranged during transverse seepage).
(2) The two wings of the high-level water tank and the low-level water tank are tightly attached to the support, the fixing holes are aligned with the strip holes of the support, the height difference between the high-level water tank and the low-level water tank of the water tank is adjusted to a numerical value required by an experiment according to the indication arrow on the water tank and the height scale on the support, and the water tank and the support are fixed together by screws and nuts.
(3) Adding water to the water supply tank, and placing a water pump in the water supply tank.
(4) Closing a valve on the high-level water tank, connecting a water supply hole of the high-level water tank with a water pump in the water supply tank by a water pipe, starting the water pump, rising the water level of the water storage area until the water flows into the water overflow area, guiding water in the water overflow area back into the water supply tank by the water pipe, installing the water pipe at a valve opening of the high-level water tank, opening the valve, and inserting the other end of the water pipe into a quick-inserting port of a bottom cover after the water pipe is full of water (the quick-inserting port of a measuring top cover should be inserted when a downward seepage experiment is carried out).
(5) Closing the valve of the low-level water tank, manually adding water into the water storage area of the low-level water tank, installing a water pipe at the valve opening of the low-level water tank, opening the valve, and inserting the other end of the water pipe into the quick-plugging port of the measurement top cover after the water pipe is full of water (the quick-plugging port of the bottom cover should be plugged when a downward seepage experiment is carried out). And continuously adding water into the water storage area of the low-level water tank until the water overflows, and leading the water in the water overflow area back to the water supply tank through the water pipe.
(6) And opening a valve on the seepage cylinder to form a passage, so that water flow can be generated in the sand.
(7) The change in the reading of the weighing base was recorded at intervals until the end of the experiment. When gas escapes from the sand, the escaping gas is carried out by the flowing water, the weight of the weighing base is increased, and the ratio of the increased weight to the density of the flowing water is the volume of the escaping gas. The weighing base can be connected with a computer to record data in real time when needed.
Specific test examples
(1) Preparation of sand samples
The experimental sand sample was wortmawa sand, which had a specific gravity of 2.66 as measured prior to the experiment.
(2) Sample loading
The bottom cover is connected with the cylinder body, and the buffer chamber and the filter chamber of the bottom cover are filled with pure water. Adding a certain amount of denitrifying bacteria treatment fluid (the treatment fluid comprises 10ml/L of denitrifying bacteria solution with OD value of 0.4, 50mmol/L of potassium nitrate, 50mmol/L of sodium acetate and other trace elements) into the cylinder, and pouring a sand sample by adopting a sand rain method, wherein the liquid level is always higher than the sand sample in the pouring process, so as to ensure that the sample is completely saturated until the sand sample fills the cylinder. By adopting the method, the sample 1 is prepared, 510ml of treatment fluid is poured in the sample preparation process, 1755g of sand is poured in, the sand injection volume is 659.8cm < 3 >, and the pore ratio is 0.77. After filling, a top cover is arranged, and pure water is filled into the water filling pipe until the liquid level reaches the 0 scale of the measuring chamber.
Sample 2 was poured in the same manner as in sample 1, but the liquid in the cylinder was changed from the denitrifying bacteria treatment liquid to the Bacillus pasteurization treatment liquid (the treatment liquid composition was: 500ml/L of Bacillus pasteurization solution having an activity of 0.6 mS/cm. Min, 1mol/L of calcium chloride and 1mol/L of urea). 508ml of treatment fluid and 1780g of sand are poured in the sample preparation process, the sand injection volume is 669.2cm3, and the pore ratio is 0.76. And installing a top cover after filling, and filling water into the top cover by a water injection pipe.
(3) Hypotonic and desaturation treatment
And vertically placing the sample 1 on a fixed base, standing until the liquid level in the top cover is not changed, and finally obtaining the sample saturation of 71% when the liquid level reaches 148 ml.
And vertically placing the sample 2 on a fixed base, standing for 4 days, pouring 1.5L denitrifying bacteria treatment liquid through a connecting hole of a bottom cover by using a peristaltic pump after the treatment liquid is completely reacted, and discharging the liquid in sandy soil through the connecting hole of the top cover. After filling, the liquid in the top cover is pumped out by the needle tube, so that the liquid level in the top cover is reduced to 0 scale. And standing until the liquid level in the top cover is not changed, and finally reaching the scale of 158ml, wherein the saturation of the sample is calculated to be 69%.
(4) Seepage test
The method comprises the steps of placing a sample and a fixed base on a weighing device, connecting a seepage tube and a water head adjusting unit by using a pipe fitting, adjusting the water head difference between a high-level water tank and a low-level water tank to be 15cm, opening a water pump in a water supply tank and manually injecting water into the low-level water tank, opening each valve of the device after the water levels in the high-level water tank and the low-level water tank are stable, forming a seepage passage, and recording the indication change of the weighing device. And measuring the flow rate of water flow in two samples within a fixed time every 12 hours, and calculating the permeability change of the samples according to the fixed water head difference and the length and the sectional area of the samples.
(5) Analysis of saturation changes
After the gas in the sample escapes, the space is filled with water, so that the mass of the sample is increased, and the increased mass is divided by the density of the water, namely the volume of the escaping gas.
The sample saturation change calculated from the experimental record is shown in fig. 7; the pattern permeability changes calculated from the experimental records are shown in figure 8.
Analytical data show that under the condition that the hypotonic treatment is not carried out, the gas in the sample escapes at a relatively high speed, the permeability of the sample is obviously changed after the hypotonic treatment is carried out by using the bacillus pasteurizer, the gas escape speed is obviously reduced, and the hypotonic treatment has a relatively good effect of improving the durability of the gas.
Claims (7)
1. An experimental device for be arranged in testing unsaturated sand gaseous persistence, its characterized in that: comprises a seepage cylinder (1), a water head adjusting unit (2) and a weighing unit (3); the seepage cylinder (1) comprises a cylinder body (101) for containing sand, a top cover (102) for calculating the volume of gas generated after the sand is subjected to saturation reduction treatment, and a bottom cover (103) for reducing the impact of water flow on the sand; the water head regulating unit (2) comprises a high-level water tank (202) and a low-level water tank (203) which are connected with the top cover and the bottom cover of the seepage cylinder and generate water flow in sand; the seepage cylinder (1) is arranged on the weighing unit (3), and the mass change of the seepage cylinder is weighed by the weighing unit to calculate the volume of the sand escaping gas; a fixed base (301) is further arranged between the seepage cylinder (1) and the weighing unit (3), and a longitudinal cavity or a transverse groove which is used for longitudinally arranging the seepage cylinder is formed in the fixed base (301); when the seepage cylinder (1) is longitudinally arranged on the fixed base (301), the bottom of the bottom cover is connected with the high-level water tank through a pipeline, the top of the top cover is connected with the low-level water tank through a pipeline, or the bottom of the bottom cover is connected with the low-level water tank through a pipeline, and the top of the top cover is connected with the high-level water tank through a pipeline; when the seepage cylinder (1) is transversely arranged on the fixed base (301), the bottom of the bottom cover is connected with the high-level water tank through a pipeline, and the top of the top cover is connected with the low-level water tank through a pipeline; the water head regulating unit (2) further comprises a water supply tank (206), and the high-level water tank (202) and the low-level water tank (203) are connected with the water supply tank (206) through pipelines.
2. The experimental set-up according to claim 1, wherein: the top cover (102) comprises an exhaust chamber (111), a measuring chamber (112) and a filtering chamber (113) from top to bottom, wherein a connecting port and a water injection hole are formed in the top of the exhaust chamber (111).
3. The experimental set-up according to claim 2, wherein: the exhaust chamber (111) is conical, a connecting port is formed in the center of the top of the exhaust chamber, a valve is installed, and a water injection hole is formed in the position, deviating from the center of the top, of the exhaust chamber.
4. The experimental set-up according to claim 1, wherein: the bottom cover (103) comprises a filter chamber (113) and a buffer chamber (115) from top to bottom, wherein a connecting hole is formed in the bottom of the buffer chamber (115) and a valve is arranged on the bottom of the buffer chamber.
5. The experimental set-up according to claim 1, wherein: an overflow partition plate (204) is arranged in the high-level water tank (202) and the low-level water tank (203) to divide the water tank into an overflow area and a water storage area, and the height of the overflow partition plate (204) is lower than the water tank wall.
6. The experimental set-up of claim 5, wherein: the water head adjusting unit (2) further comprises a support (201), height scales are arranged on the support (201), and the high-level water tank (202) and the low-level water tank (203) are arranged on the support (201).
7. The experimental set-up of claim 6, wherein: the high-level water tank (202) and the low-level water tank (203) are provided with indication arrows (211), and the height of the indication arrows (211) is the same as that of the overflow baffle plate (204).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810693504.4A CN108760564B (en) | 2018-06-29 | 2018-06-29 | Experimental device for be arranged in testing unsaturated sand gas persistence |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810693504.4A CN108760564B (en) | 2018-06-29 | 2018-06-29 | Experimental device for be arranged in testing unsaturated sand gas persistence |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108760564A CN108760564A (en) | 2018-11-06 |
| CN108760564B true CN108760564B (en) | 2024-04-19 |
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