CN111504880A - Comprehensive testing device and method for horizontal drainage performance - Google Patents
Comprehensive testing device and method for horizontal drainage performance Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 80
- 238000000034 method Methods 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 120
- 239000000463 material Substances 0.000 claims abstract description 38
- 239000008399 tap water Substances 0.000 claims abstract description 26
- 235000020679 tap water Nutrition 0.000 claims abstract description 26
- 230000001105 regulatory effect Effects 0.000 claims abstract description 12
- 238000002425 crystallisation Methods 0.000 claims abstract description 7
- 230000008025 crystallization Effects 0.000 claims abstract description 5
- 150000003839 salts Chemical class 0.000 claims abstract description 5
- 238000010998 test method Methods 0.000 claims description 13
- 239000004576 sand Substances 0.000 claims description 9
- 239000000243 solution Substances 0.000 claims description 9
- 239000012085 test solution Substances 0.000 claims description 9
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 6
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 6
- 150000002500 ions Chemical class 0.000 claims description 6
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 3
- 235000019738 Limestone Nutrition 0.000 claims description 3
- 239000001110 calcium chloride Substances 0.000 claims description 3
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 239000003673 groundwater Substances 0.000 claims description 3
- 239000006028 limestone Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 3
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 3
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 3
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 230000002706 hydrostatic effect Effects 0.000 claims description 2
- 239000000853 adhesive Substances 0.000 claims 1
- 230000001070 adhesive effect Effects 0.000 claims 1
- 238000007789 sealing Methods 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 238000011056 performance test Methods 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 abstract description 2
- 230000010354 integration Effects 0.000 abstract description 2
- 239000013078 crystal Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000004746 geotextile Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920001059 synthetic polymer Polymers 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
Abstract
The invention belongs to the technical field of geosynthetic material detection, and particularly relates to a comprehensive testing device and a method for horizontal drainage performance, wherein the main structure of the device comprises a test water tank, a drainage channel, a tap water tank, a water collecting tank, a first valve, a pressurizing water pump, a second valve, a water suction pump, a flowmeter, a high drainage hole, a low drainage hole, a rigid cushion block and a jack pressurizing plate, and the device can be used for testing the drainage capacity of a geosynthetic material in an environment consistent with the actual engineering of a tunnel, including normal conditions, silt clogging conditions and salt crystallization conditions, and monitoring the water pressure and flow in real time, so that the complex operation that the water pressure and flow at different times need to be recorded in the prior art is avoided, and the intelligent real-time monitoring of the drainage capacity is realized; the hydraulic pressure regulating device is simple in structure, can regulate the hydraulic pressure according to the actual engineering hydraulic pressure, can perform drainage performance tests, anti-clogging tests and anti-crystallization tests under supporting pressure, and has high integration.
Description
The technical field is as follows:
the invention belongs to the technical field of geosynthetic material detection, and particularly relates to a comprehensive testing device and method for horizontal drainage performance.
Background art:
geosynthetics are manufactured from synthetic polymers as raw materials into various types of products, including nonwoven fabrics, geogrids, geomembranes, composite drainage nets, geonet mats, and the like. The geosynthetic material has excellent functions of filtration, drainage, isolation and the like, is light in weight, high in tensile strength, good in permeability and corrosion-resistant, and is widely applied to construction of water conservancy, traffic, building engineering and the like.
The composite lining structure adopted by most mountain tunnels is usually provided with a drainage system between primary support and secondary lining, the adopted material is usually non-woven geotextile, and other types of geosynthetic materials (such as capillary drainage plates and convex shell drainage plates) are also adopted, the geosynthetic materials mainly play a role in water diversion, and seepage water at the back of the lining flows along the horizontal direction of the lining and finally collects in longitudinal drainage ditches at two sides of the tunnel and is discharged out of the tunnel. Therefore, the geosynthetic drainage material needs to have good horizontal drainage performance, and meanwhile, it is very important to reasonably determine the drainage performance index of the geosynthetic material for tunnel engineering.
The method mainly comprises the steps of measuring by referring to instruments and methods in an S L235-2012 geosynthetic material test procedure and a JTG E50-2006 geosynthetic material test procedure, wherein the instruments can be loaded with a small amount of water pressure and lateral contact pressure, in actual tunnel engineering, the geosynthetic material is laid between primary support two liners and is subjected to a large contact pressure, and meanwhile, the water pressure of a deep-buried tunnel is large, in addition, the horizontal drainage performance of the geosynthetic material is reduced to a certain extent under the condition that the geosynthetic material is blocked by surrounding rock particles or crystals, and the defects exist in the prior art, so that the test result cannot well represent the horizontal drainage performance of the geosynthetic material serving as the drainage material in the actual tunnel engineering, for example, a drainage performance test device disclosed in China patent 201810258247.1 comprises a sample clamping part, wherein the sample clamping part comprises an upper disc, a lower disc, the sample clamping part is movably connected with the lower disc, a clamping upper disc and a lower disc are jointly defined by the upper disc, the clamping part is used for placing the sample clamping part, the upper disc and the lower disc is arranged in a horizontal clamping structure, the upper disc and a plurality of the lower disc are arranged in a horizontal clamping structure, the test device, the upper disc is arranged in a manner that the upper disc and the horizontal clamping part is arranged in a plurality of the horizontal clamping structure, the horizontal clamping device is arranged in the horizontal clamping structure, the horizontal clamping device is arranged in the horizontal clamping device, the test device is arranged in the horizontal clamping device, the horizontal clamping device is arranged in the horizontal clamping device, the test device, the horizontal clamping device is arranged in the horizontal clamping device, the horizontal.
The invention content is as follows:
the invention aims to overcome the defects in the prior art, and seeks to design a comprehensive testing device and method for horizontal drainage performance, test the horizontal drainage performance of a geosynthetic material in the actual tunnel engineering environment, and monitor water pressure and flow in real time.
In order to achieve the purpose, the main structure of the comprehensive testing device for the horizontal drainage performance comprises a test water tank, a drainage channel, a tap water tank, a water collecting tank, a first valve, a pressure water pump, a second valve, a water suction pump, a flowmeter, a high drainage hole, a low drainage hole, a rigid cushion block and a jack pressure plate, wherein the test water tank and the drainage channel are fixedly connected into an integrated L-shaped structural toughened model box, the test water tank is respectively connected with the tap water tank and the water collecting tank in a pipeline mode, the first valve and the pressure water pump are arranged between the test water tank and the tap water tank, the second valve, the water suction pump and the flowmeter are arranged between the test water tank and the water collecting tank, the high drainage hole and the low drainage hole are formed in the side wall of the test water tank, the rigid cushion block is arranged on the outer side of the drainage channel, the jack pressure plate is arranged on the rigid cushion block, the tap water tank is located above the test water tank, the water tank is located below the drainage channel, the water collecting tank, the water pump and the water flow meter can monitor the flow in the test process in real time, the rigid drainage channel, the rigid cushion block is arranged in the test water tank, the rigid cushion block is arranged on the test water tank, the rigid cushion block, the rigid drainage channel, the rigid cushion block.
The invention relates to a comprehensive test method for horizontal drainage performance, which tests drainage capacity in tap water, and the specific process comprises the following steps:
cutting the geosynthetic material into a sample with a set size and placing the sample in a drainage channel;
adjusting the pressure above the rigid cushion block to 2KPa through a jack pressurizing plate, opening a first valve, and introducing water in a tap water tank into the rigid model box to fully saturate the sample;
thirdly, adjusting the supporting pressure to 20KPa through a jack pressurizing plate, and maintaining the pressure for 6 min;
(IV) continuously adding water into the rigid model box, opening the low drain hole, performing a test under the condition that the test water head is 0.1, and recording the water temperature and the flow Q of the flowmeter during the test;
regulating the supporting pressure from 20KPa to 100KPa through a jack pressurizing plate, then regulating the supporting pressure to 200KPa, and respectively recording the water temperature and the flow Q of the flowmeter when the supporting pressure is 100KPa and 200 KPa;
(VI) the maximum hydrostatic pressure of the rigid model box is 10KPa, when more water pressure is needed, the water pressure is provided by a pressurizing water pump, the water pressure is respectively regulated to 30KPa and 50KPa, and the operation of the step (five) is repeated;
(VII) according to the formula:
calculating the flow velocity, wherein Q is the flow (m)3S) A is the area of the sample (m)2)。
The invention relates to a comprehensive test method for horizontal drainage performance, which is used for testing the drainage capacity of silt clogging environment in muddy water, and the specific process comprises the following steps:
cutting the geosynthetic material into a sample with a set size and placing the sample in a drainage channel;
secondly, preparing a fine sand solution according to the engineering groundwater environment;
thirdly, adjusting the pressure above the rigid cushion block to 2KPa (including the dead weight of the rigid cushion block) through a jack pressurizing plate, opening a first valve, and introducing water in a tap water tank into the rigid model box to fully saturate the sample;
fourthly, adjusting the supporting pressure to 20KPa through a jack pressurizing plate, and maintaining the pressure for 6 min;
continuously adding fine sand solution into the rigid model box, opening a high drainage hole, performing a test under the condition that the test water head is 1.0, and recording the sand content of the liquid in the water collecting tank and the flow Q of the flowmeter;
regulating the supporting pressure from 20KPa to 100KPa through a jack pressurizing plate, then regulating the supporting pressure to 200KPa, and respectively recording the flow Q of the flowmeter when the supporting pressure is 100KPa and 200 KPa;
(VII) according to the formula:
calculating the flow velocity, wherein Q is the flow (m)3S) A is the area of the sample (m)2)。
The invention relates to a comprehensive testing method for horizontal drainage performance, which tests the drainage capacity in a salt crystallization environment in an ionic solution, and the specific process comprises the following steps:
cutting the geosynthetic material into a sample with a set size and placing the sample in the drainage channel 2;
secondly, preparing a test solution containing calcium chloride, magnesium chloride and sodium bicarbonate according to the ion environment of underground water of the limestone tunnel in actual engineering;
thirdly, adjusting the pressure above the rigid cushion block to 2KPa (including the dead weight of the rigid cushion block) through a jack pressure plate, opening a first valve, introducing a test solution in a tap water tank into the rigid model box, and starting a water suction pump to pump the test solution into a water collection tank for circulation;
stopping the pump for 1 time every 7 days, supplementing the ion content, taking out the sample, drying and weighing the sample after the set times or days are reached, and recording the flow Q of the flow meter;
(V) according to the formula:
the flow rate is calculated.
The flow velocity v obtained by the comprehensive test method for the horizontal drainage performance can represent the drainage capacity of the geosynthetic material under different conditions, wherein the larger the flow velocity v is, the better the drainage effect of the geosynthetic material is, and the smaller the flow velocity v is, the poorer the drainage effect of the geosynthetic material is; when the supporting pressure is increased, the cross section of the geosynthetic material is compressed, the drainage sectional area is reduced, and the flow velocity v is reduced; when silt exists on the cross section of the geosynthetic material, the flow velocity v is reduced due to physical silting of the drainage cross section; when the cross-section of the geosynthetic material crystallizes, the formation of crystals impedes the drainage of water, and chemical fouling of the drainage cross-section results in a decrease in the flow velocity v.
Compared with the prior art, the method can test the drainage capacity of the geosynthetic material in an environment consistent with the actual engineering of the tunnel, including normal conditions, silt clogging conditions and salt crystallization conditions, and monitor the water pressure and flow in real time, thereby avoiding the complex operation of recording the water pressure and flow at different times in the prior art and realizing the intelligent real-time monitoring of the drainage capacity; the hydraulic pressure regulating device is simple in structure, can regulate the hydraulic pressure according to the actual engineering hydraulic pressure, can perform drainage performance tests, anti-clogging tests and anti-crystallization tests under supporting pressure, and has high integration.
Description of the drawings:
fig. 1 is a schematic diagram of the principle of the main structure of the present invention.
Fig. 2 is a three-dimensional effect diagram of the main structure of the present invention.
FIG. 3 is a real object diagram of the toughening mold box according to the present invention.
Fig. 4 is a real image of the rigid spacer according to the present invention.
The specific implementation mode is as follows:
the invention is further described below by way of an embodiment example in conjunction with the accompanying drawings.
Example 1:
the main structure of the comprehensive testing device and the method for horizontal drainage performance comprises a test water tank 1, a drainage channel 2, a tap water tank 3, a water collecting tank 4, a first valve 5, a pressure water pump 6, a second valve 7, a water suction pump 8, a flowmeter 9, a high drainage hole 10, a low drainage hole 11, a rigid cushion block 12 and a jack pressure plate 13, wherein the test water tank 1 and the drainage channel 2 are fixedly connected into an integrated L-shaped structural toughened model box, the test water tank 1 is respectively connected with the tap water tank 3 and the water collecting tank 4 in a pipeline mode, the tap water tank 3 is positioned above the test water tank 1, the water collecting tank 4 is positioned below the drainage channel 2, the first valve 5 and the pressure water pump 6 are arranged between the test water tank 1 and the tap water tank 3, the second valve 7, the water suction pump 8 and the flowmeter 9 are arranged between the test water tank 1 and the water collecting tank 4, the high drainage hole 10 and the low hole 11 are formed in the side wall of the test water tank 1, the rigid cushion block 12 is arranged on the outer side of the drainage channel 2, and two side surfaces of the rigid cushion block 12 are respectively attached to the drainage.
Example 2:
the comprehensive test method for horizontal drainage performance related to the embodiment tests the drainage capacity in tap water, and the specific technological process comprises the following steps:
cutting the geosynthetic material into samples with the lengths and the widths of 55cm and 25cm, and placing the samples in the drainage channel 2;
secondly, adjusting the pressure above the rigid cushion block 12 to 2KPa (including the self weight of the rigid cushion block 12) through a jack pressurizing plate 13, opening a first valve 5, and introducing water in a tap water tank 3 into the rigid model box to fully saturate a sample;
thirdly, adjusting the supporting pressure to 20KPa through a jack pressurizing plate 13, and maintaining the pressure for 6 min;
(IV) continuously adding water into the rigid model box, opening the low drain hole 11, performing a test under the condition that the test water head is 0.1, and recording the water temperature and the flow rate of the flowmeter 9 during the test;
fifthly, the supporting pressure is adjusted from 20KPa to 100KPa through a jack pressurizing plate 13 and then adjusted to 200KPa, and the water temperature and the flow of the flowmeter 9 are respectively recorded when the supporting pressure is 100KPa and 200 KPa;
sixthly, opening the high drain hole 10 and repeating the operation of the step (five);
(VII) according to the formula:
the flow rate is calculated.
Example 3:
the comprehensive test method for horizontal drainage performance related in the embodiment tests the drainage capacity of silt clogging environment in muddy water, and the specific technological process comprises the following steps:
cutting the geosynthetic material into samples with the lengths and the widths of 55cm and 25cm, and placing the samples in the drainage channel 2;
(II) preparing the particle size of less than 0.5mm and the concentration of 7kg/m according to the engineering groundwater environment3Fine sand solution of (2);
thirdly, the pressure above the rigid cushion block 12 is adjusted to 2KPa (including the self weight of the rigid cushion block 12) through a jack pressurizing plate 13, a first valve 5 is opened, and water in a tap water tank 3 is introduced into the rigid model box to fully saturate the sample;
fourthly, adjusting the supporting pressure to 20KPa through a jack pressurizing plate 13, and maintaining the pressure for 6 min;
(V) continuously adding the fine sand solution into the rigid model box, opening the high drain hole 10, performing a test under the condition that the test water head is 1.0, and recording the sand content of the liquid in the water collecting tank 4 and the flow Q of the flowmeter 9;
sixthly, adjusting the supporting pressure from 20KPa to 100KPa through a jack pressurizing plate 13, then adjusting the supporting pressure to 200KPa, and respectively recording the flow Q of the flowmeter 9 when the supporting pressure is 100KPa and 200 KPa;
(VII) according to the formula:
the flow rate is calculated.
Example 4:
the comprehensive test method for horizontal drainage performance related in the embodiment tests the drainage capacity in a salt crystallization environment in an ionic solution, and the specific technological process comprises the following steps:
cutting the geosynthetic material into samples with the lengths and the widths of 55cm and 25cm, and placing the samples in the drainage channel 2;
secondly, preparing a test solution containing calcium chloride, magnesium chloride and sodium bicarbonate according to the ion environment of underground water of the limestone tunnel in actual engineering;
thirdly, adjusting the pressure above the rigid cushion block 12 to 2KPa (including the self weight of the rigid cushion block 12) through a jack pressure plate 13, opening a first valve 5, introducing the test solution in the tap water tank 3 into the rigid model box, and starting a water suction pump 8 to pump the test solution into the water collection tank 4 for circulation;
fourthly, stopping the pump for 1 time every 7 days, supplementing the ion content, repeating for 4 times, taking out the sample, drying and weighing after 28 days, subtracting the original mass of the sample to obtain the mass of the crystal, and recording the flow Q of the flowmeter 9;
(V) according to the formula:
the flow rate is calculated.
The area A of the sample according to the present example was 0.1m2On day 1, the flow rate Q of the flowmeter 9 was 0.0005m3The flow velocity v is calculated according to a formula and is 0.005 m/s; the flow rate Q of the flow meter 9 on day 28 was reduced to 0.0003m due to the formation of crystals on the surface of the sample3The flow velocity v, calculated according to the formula, was 0.003m/s, indicating that: under the long-term drainage effect, the drainage performance of the geosynthetic material is gradually reduced.
Claims (6)
1. A comprehensive testing device for horizontal drainage performance is characterized in that a main structure comprises a test water tank, a drainage channel, a tap water tank, a water collecting tank, a first valve, a pressure water pump, a second valve, a water suction pump, a flowmeter, a high water drainage hole, a low water drainage hole, a rigid cushion block and a jack pressure plate, wherein the test water tank and the drainage channel are fixedly connected into an integrated L-shaped toughened model box, the test water tank is respectively in pipeline connection with the tap water tank and the water collecting tank, the first valve and the pressure water pump are arranged between the test water tank and the tap water tank, and the second valve, the water suction pump and the flowmeter are arranged between the test water tank and the water collecting tank.
2. The comprehensive testing device for the horizontal drainage performance of claim 1, wherein the side wall of the test water tank is provided with a high drainage hole and a low drainage hole, a rigid cushion block is placed on the outer side of the drainage channel, and a jack pressure plate is arranged on the rigid cushion block.
3. The comprehensive test device for the horizontal drainage performance of claim 1, wherein a tap water tank is positioned above a test water tank, a water collecting tank is positioned below a drainage channel, and the water collecting tank, a water suction pump and a flowmeter can monitor the flow in the test process in real time; the high water drainage hole and the low water drainage hole are respectively used for providing hydraulic gradient of which i is 1.0 and i is 0.1, and when higher water pressure is needed, a water pressure increasing unit consisting of a tap water tank, a first valve and a pressurizing water pump provides water pressure meeting the test requirement; two side surfaces of the rigid cushion block are respectively attached to the test water tank and the drainage channel; before the test is started, cutting the geosynthetic material to a set size, placing the cut geosynthetic material into the drainage channel, placing a rigid cushion block with the same size above the geosynthetic material, and sealing the drainage channel and the rigid cushion block by using a rubber ring and structural adhesive; in the test process, the jack pressurizing plate is pressurized according to the supporting pressure required by the test, and the pressure is uniformly transmitted to the geosynthetic material in the drainage channel through the rigid cushion block.
4. A comprehensive test method for horizontal drainage performance is characterized in that the comprehensive test method is realized based on a comprehensive test device for horizontal drainage performance, and a specific technological process for testing drainage capacity in tap water comprises the following steps:
cutting the geosynthetic material into a sample with a set size and placing the sample in a drainage channel;
secondly, adjusting the pressure above the rigid cushion block to 2KPa through a jack and a pressure plate, opening a first valve, and introducing water in a tap water tank into the rigid model box to fully saturate a sample;
thirdly, adjusting the supporting pressure to 20KPa through a jack pressurizing plate, and maintaining the pressure for 6 min;
(IV) continuously adding water into the rigid model box, opening the low drain hole, performing a test under the condition that the test water head is 0.1, and recording the water temperature and the flow Q of the flowmeter during the test;
regulating the supporting pressure from 20KPa to 100KPa through a jack pressurizing plate, then regulating the supporting pressure to 200KPa, and respectively recording the water temperature and the flow Q of the flowmeter when the supporting pressure is 100KPa and 200 KPa;
(VI) the maximum hydrostatic pressure of the rigid model box is 10KPa, when more water pressure is needed, the water pressure is provided by a pressurizing water pump, the water pressure is respectively regulated to 30KPa and 50KPa, and the operation of the step (five) is repeated;
(VII) according to the formula:
the flow rate was calculated, where Q is the flow rate and A is the area of the sample.
5. A comprehensive test method for horizontal drainage performance is characterized in that the comprehensive test device based on the horizontal drainage performance is realized, and the specific process for testing the drainage capacity of silt clogging environment in muddy water comprises the following steps:
cutting the geosynthetic material into a sample with a set size and placing the sample in a drainage channel;
secondly, preparing a fine sand solution according to the engineering groundwater environment;
thirdly, adjusting the pressure above the rigid cushion block to 2KPa through a jack and a pressure plate, opening a first valve, and introducing water in a tap water tank into the rigid model box to fully saturate the sample;
fourthly, adjusting the supporting pressure to 20KPa through a jack pressurizing plate, and maintaining the pressure for 6 min;
continuously adding fine sand solution into the rigid model box, opening a high drainage hole, performing a test under the condition that the test water head is 1.0, and recording the sand content of the liquid in the water collecting tank and the flow Q of the flowmeter;
regulating the supporting pressure from 20KPa to 100KPa through a jack pressurizing plate, then regulating the supporting pressure to 200KPa, and respectively recording the flow Q of the flowmeter when the supporting pressure is 100KPa and 200 KPa;
(VII) according to the formula:
the flow rate was calculated, where Q is the flow rate and A is the area of the sample.
6. A comprehensive test method for horizontal drainage performance is characterized in that the comprehensive test method is realized based on a comprehensive test device for horizontal drainage performance, and a specific process for testing the drainage capacity in a salt crystallization environment in an ionic solution comprises the following steps:
cutting the geosynthetic material into a sample with a set size and placing the sample in a drainage channel;
secondly, preparing a test solution containing calcium chloride, magnesium chloride and sodium bicarbonate according to the ion environment of underground water of the limestone tunnel in actual engineering;
thirdly, adjusting the pressure above the rigid cushion block to 2KPa through a jack and a pressure plate, opening a first valve, introducing a test solution in a tap water tank into the rigid model box, and starting a water suction pump to pump the test solution into a water collection tank for circulation;
stopping the pump for 1 time every 7 days, supplementing the ion content, taking out the sample, drying and weighing the sample after the set times or days are reached, and recording the flow Q of the flow meter;
(V) according to the formula:
the flow rate is calculated.
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| PCT/CN2020/126650 WO2021227394A1 (en) | 2020-05-09 | 2020-11-05 | Horizontal drainage performance comprehensive testing apparatus and method |
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| WO2021227394A1 (en) * | 2020-05-09 | 2021-11-18 | 青岛理工大学 | Horizontal drainage performance comprehensive testing apparatus and method |
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| CN109827958B (en) * | 2018-12-21 | 2023-08-18 | 长安大学 | Karst area tunnel drainage system crystallization blocking simulation test device and test method |
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| WO2021227394A1 (en) * | 2020-05-09 | 2021-11-18 | 青岛理工大学 | Horizontal drainage performance comprehensive testing apparatus and method |
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