CN110954675A - Special device for seasonal frozen soil indoor test and research method - Google Patents
Special device for seasonal frozen soil indoor test and research method Download PDFInfo
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Abstract
A special device for seasonal frozen soil indoor test and a research method. Step one, marking lines are drawn. And step two, film pasting. And step three, filling soil. And fourthly, piling. Step five freezing, utilizingSeasonal frozen soil chamber Internal test deviceAnd (5) freezing the soil body. And step six, embankment stacking and camera fixing. Step seven: controlling the freezing depth of the frozen soil, observing the freezing and thawing cycle of the frozen soil indoors, simulating the change of the external real environment temperature, and obtaining the non-drainage shear strength c of the soil body by utilizing the observation of the freezing and thawing process and calculationuAnd the characteristics of frozen soil freezing and thawing engineering are comprehensively researched.Indoor test device for seasonal frozen soilThe experimental device comprises a seasonal frozen soil indoor test model box body, a refrigeration circulation system and a temperature acquisition system. The invention can simulate the temperature change of the real external environment, can quickly realize the one-way freezing process of the soil body, and can simulate seasonal frozen soil by setting different freezing depths of the soil body according to the test requirementsThe method is convenient and quick, simple in operation method, strong in practicability and convenient to popularize and use.
Description
Technical Field
The invention belongs to the field of geotechnical engineering, and relates to a frozen soil low-temperature characteristic analysis technology.
Background
Statistically, frozen earth is present in 70% of the global land area, 14% of which is permafrost and 56% of which is seasonally frozen earth. China is the third large frozen soil country in the world, wherein the distribution area of the frozen soil for many years is 2.068 multiplied by 106km2The soil occupies 21.5 percent of the national soil area of China, and the frozen soil is wide in distribution area, and the distribution area is 5 percent.137×106km2The land area of China is 53.5%, and the total area of the land area and the land area is about 3/4% of the total area of the whole country. The frozen soil is a soil body medium which is extremely sensitive to temperature, the accumulation of moisture and salt is accompanied in the freezing and thawing process, so that the seasonal frozen soil generates frost heaving and thawing settlement phenomena, foundation engineering and road and bridge engineering in a frozen soil area are damaged to a certain extent, the use condition of the structures on the frozen soil foundation in a severe cold area is seriously troubled by the frost heaving problem, and literature data show that the service life of roads in the frozen soil area is shortened by 50% due to frost heaving damage, and the maintenance cost is greatly increased. The research on the physical characteristic change characteristics of soil under the freeze-thaw condition is important in the fields of frozen soil engineering, frozen soil agriculture, land water circulation and the like. The research is mainly realized by two ways of indoor simulation and outdoor monitoring, and because outdoor monitoring cost is high and repeatability is poor, the domestic determination of the physical properties of the frozen soil is mostly carried out by adopting an indoor simulation mode. The existing domestic frozen soil test device cannot well simulate the freezing process of soil in the external real environment, and some soil columns are directly placed into a refrigerator, so that the soil is frozen from the periphery to the center, and the freezing process is inconsistent with the cooling process of the actual environment from top to bottom. Some test devices have too thin soil columns, the diameter of each soil column is less than 10cm, the freezing process of soil is influenced by the pipe wall from outside to inside, the difference from the real environment is very large, and the unidirectional freezing of a soil body cannot be realized.
In summary, the conventional indoor frozen soil freezing and thawing cycle observation method cannot simulate the change of the external real environment temperature and control the freezing depth of the frozen soil, and a test device capable of quickly, simply and efficiently observing the frozen soil thawing process indoors is needed to better research the freezing and thawing problem of seasonal frozen soil in a laboratory.
Disclosure of Invention
The invention aims to solve the technical defects of the conventional frozen soil test device and provides a seasonal frozen soil indoor test device and a seasonal frozen soil indoor test method.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
technical scheme one
The utility model provides a seasonal frozen soil indoor test device which characterized in that, includes seasonal frozen soil indoor test mold box 1, refrigeration cycle system and temperature acquisition system, wherein:
a piece of transparent high-strength toughened glass 6 is arranged on the side wall of the front side of the seasonal frozen soil indoor test model box body 1, so that the change of a soil body 7 can be observed in the test freezing and melting processes; a heat insulation material 8 is arranged in the box body 1, and a Teflon film 9 is adhered to the box body;
the freezing circulation system comprises freezing circulation equipment 3, a box cover 2, glycol media 10, a water inlet 13 and a water outlet 14, wherein more than 90% of high-concentration glycol 10 is filled in the box cover 2 of the seasonal frozen soil indoor test model box to serve as circulating liquid, the glycol media 10 enter the box cover 2 from the water inlet 13, flow out of the box cover 2 from the water outlet 14, enter the freezing circulation equipment 3, are cooled by the freezing circulation equipment 3 and then enter the box cover 2 from the water inlet 13, and therefore liquid circulation is achieved;
the temperature acquisition system comprises a temperature acquisition instrument 4 and a temperature sensor 5, wherein the temperature sensor 5 is embedded in a soil body 7, and the port of the temperature sensor is connected with the temperature acquisition instrument 4.
Technical scheme two
The indoor test method for the seasonally frozen soil is characterized by sequentially comprising the following steps of:
step one, marking lines are drawn:
a square grid is drawn on the front side of the high-strength transparent toughened glass 6 of the box body 1 at intervals of 5cm along the transverse direction and the longitudinal direction by using a marker pen so as to observe the deformation of a soil body;
step two, film pasting:
two layers of Teflon films 9 are distributed on the inner wall of the box body 1;
step three, filling soil:
pouring a soil body 7 with a certain water content saturation into the box body 1 to reach a certain depth, and embedding a temperature sensor 5 in the soil body 1 in advance; then, the soil body is solidified to a preset solidification degree under the centrifugal acceleration, a small static penetrometer is adopted to carry out a penetration test after the machine is stopped, and the test soil body 7 is obtained sCurve of "specific penetration resistance p-depthMeter for measuringCalculating the non-drainage shear strength c of the soil body 7u；
Piling:
inserting the steel pipe into foundation soil, taking a soil body in the steel pipe, cleaning a hole wall, then putting a model reinforced material sleeve, filling quartz sand with a certain height into the model reinforced material sleeve, and inserting a hollow PVC rod to perform injection compaction on the hollow PVC rod. Repeating the steps until the pile body is finished, then moving out the steel pipe, finishing the pile body, and removing the quartz sand and the reinforcing materials which are higher than the surface of the foundation soil to enable the top surface of the pile body to be flush with the surface of the foundation;
step five, freezing:
by usingSeasonal frozen soil indoor test deviceFreezing the soil body 1;
the cover 2 is fixed and sealed to the case 1 by a pin 15, the freezing cycle device 3 is connected to a water inlet 13 and a water outlet 14 by a silicone tube 12, and the ethylene glycol 10 medium for freezing flows into the cover 2 from the water inlet 13 and flows into the freezing cycle device 3 from the water outlet 14. When the temperature monitored by the temperature sensor 5 reaches about 0 ℃, the freezing is stopped;
step six, embankment stacking and camera fixing:
after the refrigeration cycle equipment 3 is removed, arranging a soil pressure gauge and a displacement gauge, filling an embankment, and then carrying out a centrifugal model test, wherein the temperature can be monitored in the whole process of the centrifugal test; after the embankment is finished, fixing a camera on one side of the high-strength transparent toughened glass 6 for real-time video recording so as to observe soil deformation;
seventhly, researching the freeze-thaw engineering characteristics of the frozen soil:
controlling the freezing depth of the frozen soil, observing the freezing and thawing cycle of the frozen soil indoors, simulating the change of the external real environment temperature, and obtaining the non-drainage shear strength c of the soil body 7 by utilizing the sixth observation of the freezing and thawing process of the frozen soil and the third calculationuAnd the characteristics of frozen soil freezing and thawing engineering are comprehensively researched.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention can simulate the temperature change of the real external environment, can quickly realize the one-way freezing process of the soil body, can simulate seasonal frozen soil by setting different freezing depths of the soil body according to the test requirements, and has the advantages of convenience, quickness, simple operation method, strong practicability and convenient popularization and use.
Drawings
FIG. 1 is a schematic view of an indoor test apparatus for seasonally frozen soil;
FIG. 2 is a schematic plan view of a cover of a model box for an indoor test of seasonally frozen soil;
reference numbers in the figures:
1-seasonal frozen soil indoor test model box body, 11-stainless steel handle, 12-silicone tube, 13-water inlet, 14-water outlet;
2-box cover;
3-refrigeration cycle equipment, 4-temperature acquisition instrument, 5-temperature sensor, 6-high-strength transparent toughened glass, 7-soil body, 8-heat insulation material, 9-teflon film and more than 10-90% of high-concentration ethylene glycol.
Detailed Description
The invention is described in detail with reference to the following detailed description with reference to the accompanying drawings:
example 1
As shown in fig. 1 and 2
The utility model provides a seasonal frozen soil indoor test device which characterized in that, includes seasonal frozen soil indoor test mold box 1, refrigeration cycle system and temperature acquisition system, wherein:
a piece of transparent high-strength toughened glass 6 is arranged on the side wall of the front side of the seasonal frozen soil indoor test model box body 1, so that the change of a soil body 7 can be observed in the test freezing and melting processes; the box body 1 is internally provided with a heat insulation material 8, and a Teflon film 9 is adhered to ensure lower box wall friction, so that the aim of reducing boundary effect is fulfilled.
The freezing cycle system comprises freezing cycle equipment 3, a box cover 2, glycol media 10, a water inlet 13 and a water outlet 14, wherein the box cover 2 of the seasonal frozen soil indoor test model box is filled with more than 90% of high-concentration glycol 10 serving as circulating liquid, the glycol media 10 enter the box cover 2 from the water inlet 13, flow out of the box cover 2 from the water outlet 14, enter the freezing cycle equipment 3, are cooled by the freezing cycle equipment 3 and then enter the box cover 2 from the water inlet 13, and therefore liquid circulation is achieved. The refrigeration cycle equipment 3 adopts a low-temperature constant-temperature pump which is connected with the box cover 2 through a silicone tube 12, the refrigeration cycle medium in the refrigeration cycle equipment 3 is high-concentration ethylene glycol 10 with the concentration of more than 90%, the ethylene glycol 10 medium enters the box cover 2 from a water inlet 13 through the silicone tube 12 and flows out of the box cover 2 from a water outlet 14 through the silicone tube 12, and therefore liquid is circulated continuously, and the effect of continuously cooling the box body is achieved.
The temperature acquisition system comprises a temperature acquisition instrument 4 and a temperature sensor 5, wherein the temperature sensor 5 is embedded in a soil body 7, and the port of the temperature sensor is connected with the temperature acquisition instrument 4.
The box body 1 is made of stainless steel materials, so that corrosion and rusting are prevented.
The box cover 2 is fixedly connected with the box body 1 through a pin 15, so that the box body 1 is ensured to be sealed, and the freezing efficiency is ensured.
The top surface of case lid 2 welds stainless steel handle 11, convenient to detach.
The box cover 2 is made of stainless steel.
The concentration of the ethylene glycol is more than 90%.
The temperature sensor 5 adopts a pt100 platinum thermal resistance temperature sensor.
The inlet 13 is higher than the outlet 14 and follows the principle of "high inlet and low outlet" of the circulating liquid.
The effective internal dimensions of the model box body 1 for the seasonal frozen soil indoor test in this embodiment are 600mm × 400mm × 500mm (length × width × height).
The refrigeration cycle device 3 in this embodiment employs a low-temperature coolant circulating pump DLSB-30/80, the refrigeration temperature range thereof is-80 ℃ to room temperature, and the control accuracy is ± 0.5 ℃.
Example 2
The test method of this example was carried out using the seasonal frozen soil indoor test apparatus developed in example 1
The indoor experimental research method for the seasonal frozen soil sequentially comprises the following steps of:
step one, marking lines are drawn:
a square grid is drawn on the front side of the high-strength transparent toughened glass 6 of the box body 1 at intervals of 5cm in the transverse direction and the longitudinal direction by using a marker pen, so that the deformation of a soil body can be observed conveniently.
Step two, film pasting:
two layers of Teflon films 9 are arranged on the inner wall of the box body 1 (the inner wall of the high-strength transparent toughened glass 6 on the observation surface is not arranged) so as to eliminate the frictional resistance of the box wall.
Step three, filling soil:
pouring a soil body 7 with a certain water content saturation into the box body 1 to reach a certain depth, and embedding a temperature sensor 5 in the soil body 1 in advance; then, the soil body is solidified to a preset solidification degree under the centrifugal acceleration, a small static penetrometer is adopted to carry out a penetration test after the machine is stopped, and the test soil body 7 is obtained sCurve of "specific penetration resistance p-depthCalculating the non-drainage shear strength c of the soil body 7u。
Piling:
inserting the steel pipe into foundation soil, taking a soil body in the steel pipe, cleaning a hole wall, then putting a model reinforced material sleeve, filling quartz sand with a certain height into the model reinforced material sleeve, and inserting a hollow PVC rod to perform injection compaction on the hollow PVC rod. Repeating the steps until the pile body is finished, then moving out the steel pipe, finishing the pile body, and removing the quartz sand and the reinforcing materials which are higher than the surface part of the foundation soil to enable the top surface of the pile body to be flush with the surface of the foundation.
Step five, freezing:
by usingSeasonal frozen soil indoor test deviceThe soil body 1 is frozen.
The cover 2 is fixed and sealed to the case 1 by a pin 15, the freezing cycle device 3 is connected to a water inlet 13 and a water outlet 14 by a silicone tube 12, and the ethylene glycol 10 medium for freezing flows into the cover 2 from the water inlet 13 and flows into the freezing cycle device 3 from the water outlet 14. When the temperature monitored by the temperature sensor 5 reaches about 0 degrees, freezing is stopped.
Step six, embankment stacking and camera fixing:
after the refrigeration cycle equipment 3 is removed, a soil pressure gauge and a displacement meter are arranged, then an embankment is filled, a centrifugal model test is carried out, and the temperature can be monitored in the whole process of the centrifugal test. And after the embankment is finished, a camera is fixed on one side of the high-strength transparent toughened glass 6 for real-time video recording so as to observe soil deformation.
Seventhly, researching the freeze-thaw engineering characteristics of the frozen soil:
controlling the freezing depth of the frozen soil, observing the freezing and thawing cycle of the frozen soil indoors, simulating the change of the external real environment temperature, and obtaining the non-drainage shear strength c of the soil body 7 by utilizing the sixth observation of the freezing and thawing process of the frozen soil and the third calculationuAnd the characteristics of frozen soil freezing and thawing engineering are comprehensively researched.
Claims (6)
1. The utility model provides a seasonal frozen soil indoor test device which characterized in that, includes seasonal frozen soil indoor test mold box 1, refrigeration cycle system and temperature acquisition system, wherein:
a piece of transparent high-strength toughened glass 6 is arranged on the side wall of the front side of the seasonal frozen soil indoor test model box body 1, so that the change of a soil body 7 can be observed in the test freezing and melting processes; a heat insulation material 8 is arranged in the box body 1, and a Teflon film 9 is adhered to the box body;
the freezing circulation system comprises freezing circulation equipment 3, a box cover 2, glycol media 10, a water inlet 13 and a water outlet 14, wherein more than 90% of high-concentration glycol 10 is filled in the box cover 2 of the seasonal frozen soil indoor test model box to serve as circulating liquid, the glycol media 10 enter the box cover 2 from the water inlet 13, flow out of the box cover 2 from the water outlet 14, enter the freezing circulation equipment 3, are cooled by the freezing circulation equipment 3 and then enter the box cover 2 from the water inlet 13, and therefore liquid circulation is achieved;
the temperature acquisition system comprises a temperature acquisition instrument 4 and a temperature sensor 5, wherein the temperature sensor 5 is embedded in a soil body 7, and the port of the temperature sensor is connected with the temperature acquisition instrument 4.
2. The device as claimed in claim 1, wherein the box body 1 and the box cover 2 are made of stainless steel.
3. The device according to claim 1, characterized in that the cover 2 is fixed to the body 1 by means of pins 15, ensuring the hermetic seal of the body 1.
4. The device as claimed in claim 1, wherein the top surface of the case cover 2 is welded with a stainless handle 11 for easy detachment.
5. The apparatus of claim 1, wherein the inlet 13 is higher than the outlet 14.
6. The indoor test method for the seasonally frozen soil is characterized by sequentially comprising the following steps of:
step one, marking lines are drawn:
a square grid is drawn on the front side of the high-strength transparent toughened glass 6 of the box body 1 at intervals of 5cm along the transverse direction and the longitudinal direction by using a marker pen so as to observe the deformation of a soil body;
step two, film pasting:
two layers of Teflon films 9 are distributed on the inner wall of the box body 1;
step three, filling soil:
pouring a soil body 7 with a certain water content saturation into the box body 1 to reach a certain depth, and embedding a temperature sensor 5 in the soil body 1 in advance; then, the soil body is solidified to a preset solidification degree under the centrifugal acceleration, a small static penetrometer is adopted to carry out a penetration test after the machine is stopped, and the test soil body 7 is obtained sCurve of "specific penetration resistance p-depthCalculating the non-drainage shear strength c of the soil body 7u；
Piling:
inserting the steel pipe into foundation soil, taking a soil body in the steel pipe, cleaning a hole wall, then putting a model reinforced material sleeve, filling quartz sand with a certain height into the model reinforced material sleeve, and inserting a hollow PVC rod to perform injection compaction on the hollow PVC rod. Repeating the steps until the pile body is finished, then moving out the steel pipe, finishing the pile body, and removing the quartz sand and the reinforcing materials which are higher than the surface of the foundation soil to enable the top surface of the pile body to be flush with the surface of the foundation;
step five, freezing:
by usingSeasonal frozen soil indoor test deviceTo the soil body 1Freezing;
the cover 2 is fixed and sealed to the case 1 by a pin 15, the freezing cycle device 3 is connected to a water inlet 13 and a water outlet 14 by a silicone tube 12, and the ethylene glycol 10 medium for freezing flows into the cover 2 from the water inlet 13 and flows into the freezing cycle device 3 from the water outlet 14. When the temperature monitored by the temperature sensor 5 reaches about 0 ℃, the freezing is stopped;
step six, embankment stacking and camera fixing:
after the refrigeration cycle equipment 3 is removed, arranging a soil pressure gauge and a displacement gauge, filling an embankment, and then carrying out a centrifugal model test, wherein the temperature can be monitored in the whole process of the centrifugal test; after the embankment is finished, fixing a camera on one side of the high-strength transparent toughened glass 6 for real-time video recording so as to observe soil deformation;
seventhly, researching the freeze-thaw engineering characteristics of the frozen soil:
controlling the freezing depth of the frozen soil, observing the freezing and thawing cycle of the frozen soil indoors, simulating the change of the external real environment temperature, and obtaining the non-drainage shear strength c of the soil body 7 by utilizing the sixth observation of the freezing and thawing process of the frozen soil and the third calculationuAnd the characteristics of frozen soil freezing and thawing engineering are comprehensively researched.
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| CN111912693A (en) * | 2020-07-30 | 2020-11-10 | 石河子大学 | Frozen soil, frozen soil and frozen soil engineering research foundation platform |
| CN112525795A (en) * | 2020-11-20 | 2021-03-19 | 中国电建集团华东勘测设计研究院有限公司 | Soil body infiltration and corrosion test device at structural crack |
| CN112595835A (en) * | 2020-12-03 | 2021-04-02 | 西南交通大学 | Geological bedding tunnel model test device and test method thereof |
| CN112629993A (en) * | 2021-01-28 | 2021-04-09 | 东北电力大学 | Freezing device for soil freezing test and method for preparing frozen soil model by using freezing device |
| CN113671151A (en) * | 2021-07-27 | 2021-11-19 | 西安科技大学 | Indoor model test system for icing evolution process of tillite |
| CN114062417A (en) * | 2021-11-26 | 2022-02-18 | 东北大学 | Sewage subsurface infiltration device for simulating freeze-thaw cycle and using method thereof |
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| CN114755092A (en) * | 2022-03-23 | 2022-07-15 | 哈尔滨商业大学 | Special device and method for seasonal frozen soil indoor test |
| CN114894455A (en) * | 2022-04-22 | 2022-08-12 | 湖北工业大学 | Simulation test device for researching safety of corrosion pipeline in frozen soil area and foundation collapse |
| CN115718189A (en) * | 2022-12-14 | 2023-02-28 | 长沙理工大学 | Soil particle migration model test device and method considering complex traffic-environment effect |
| CN116297036A (en) * | 2023-02-17 | 2023-06-23 | 中国地质大学（武汉） | Rock mass freeze-thawing cycle sorting effect simulation test device and method |
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| CN111912693B (en) * | 2020-07-30 | 2023-06-30 | 石河子大学 | Frozen soil, frozen soil and frozen soil engineering research foundation platform |
| CN111912693A (en) * | 2020-07-30 | 2020-11-10 | 石河子大学 | Frozen soil, frozen soil and frozen soil engineering research foundation platform |
| CN112525795A (en) * | 2020-11-20 | 2021-03-19 | 中国电建集团华东勘测设计研究院有限公司 | Soil body infiltration and corrosion test device at structural crack |
| CN112595835A (en) * | 2020-12-03 | 2021-04-02 | 西南交通大学 | Geological bedding tunnel model test device and test method thereof |
| CN112629993A (en) * | 2021-01-28 | 2021-04-09 | 东北电力大学 | Freezing device for soil freezing test and method for preparing frozen soil model by using freezing device |
| CN113671151A (en) * | 2021-07-27 | 2021-11-19 | 西安科技大学 | Indoor model test system for icing evolution process of tillite |
| CN113671151B (en) * | 2021-07-27 | 2024-04-02 | 西安科技大学 | Indoor model test system for tillite ice-gathering evolution process |
| CN114062417A (en) * | 2021-11-26 | 2022-02-18 | 东北大学 | Sewage subsurface infiltration device for simulating freeze-thaw cycle and using method thereof |
| CN114486983A (en) * | 2022-02-10 | 2022-05-13 | 浙大城市学院 | Model test system for freeze-thaw cycle and use method thereof |
| CN114755092A (en) * | 2022-03-23 | 2022-07-15 | 哈尔滨商业大学 | Special device and method for seasonal frozen soil indoor test |
| CN114894455A (en) * | 2022-04-22 | 2022-08-12 | 湖北工业大学 | Simulation test device for researching safety of corrosion pipeline in frozen soil area and foundation collapse |
| CN115718189A (en) * | 2022-12-14 | 2023-02-28 | 长沙理工大学 | Soil particle migration model test device and method considering complex traffic-environment effect |
| CN116297036A (en) * | 2023-02-17 | 2023-06-23 | 中国地质大学（武汉） | Rock mass freeze-thawing cycle sorting effect simulation test device and method |
| CN116297036B (en) * | 2023-02-17 | 2023-12-01 | 中国地质大学（武汉） | Test method of rock mass freeze-thawing cycle sorting action simulation test device |
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