CN219951879U - Static sounding test device under stable even temperature field - Google Patents
Static sounding test device under stable even temperature field Download PDFInfo
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- CN219951879U CN219951879U CN202321103006.2U CN202321103006U CN219951879U CN 219951879 U CN219951879 U CN 219951879U CN 202321103006 U CN202321103006 U CN 202321103006U CN 219951879 U CN219951879 U CN 219951879U
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- 230000003068 static effect Effects 0.000 title claims abstract description 64
- 238000012360 testing method Methods 0.000 title claims abstract description 53
- 230000035515 penetration Effects 0.000 claims abstract description 82
- 239000000523 sample Substances 0.000 claims abstract description 46
- 238000010438 heat treatment Methods 0.000 claims abstract description 41
- 238000004321 preservation Methods 0.000 claims abstract description 37
- 238000005485 electric heating Methods 0.000 claims abstract description 28
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 8
- 239000010959 steel Substances 0.000 claims abstract description 8
- 229910000838 Al alloy Inorganic materials 0.000 claims description 33
- 238000006073 displacement reaction Methods 0.000 claims description 12
- 238000009413 insulation Methods 0.000 claims description 10
- 239000011148 porous material Substances 0.000 claims description 9
- 239000010935 stainless steel Substances 0.000 claims description 9
- 229910001220 stainless steel Inorganic materials 0.000 claims description 9
- 238000007596 consolidation process Methods 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 239000012774 insulation material Substances 0.000 claims description 6
- -1 polytetrafluoroethylene Polymers 0.000 claims description 6
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 239000004033 plastic Substances 0.000 claims description 4
- 239000002689 soil Substances 0.000 abstract description 31
- 230000002277 temperature effect Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000008859 change Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000012669 compression test Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The utility model provides a static cone penetration test device under a stable and uniform temperature field, which is provided with a temperature control system, wherein the temperature control system comprises an edge heating device, a central heating device, a top heat preservation device, a bottom heat preservation device, at least three circles of temperature sensors and a temperature control device, and soil is in a uniform temperature field by switching between two heat sources of the central heating device and the edge heating device; in addition, dissipation of heat is counteracted by the low-power electric heating tube, so that the soil body is ensured to be in a relatively stable temperature field. In addition, through setting up the loading system of top carousel, rotation steel ball and/or radial slide, can realize that static cone penetration probe switches among a plurality of penetration points, different penetration rates, carry out the penetration to the soil body of different super concretion degree. The utility model can be used for carrying out a static cone penetration test under the temperature control condition and is used for researching the influence of the temperature effect of the soil on the resistance of the cone tip of the static cone penetration, the hole pressure of the cone shoulder and the friction of the side wall.
Description
Technical Field
The utility model relates to a static cone penetration test device under stable and uniform temperature fields, which is suitable for static cone penetration model tests of various soil bodies under different temperature fields.
Background
With the acceleration of urban process and the development of geothermal geotechnical engineering in China, the temperature field of the foundation soil body presents remarkable space and time variability, which brings about interference to soil body strength interpretation based on cone beam spot sounding (CPTU), in particular to a silt soil layer. The permeability coefficient of the silt is between clay and sand, and partial drainage phenomenon exists when CPTU is in touch detection. Meanwhile, the temperature change can cause the change of the soil body permeability, thereby affecting the drainage state of the soil body.
Most of the existing soil temperature control devices realize the purpose of controlling temperature by water bath, thermocouple, liquid gasification refrigeration and the like, the uniformity of the generated temperature field is difficult to ensure, and the difference between the surface temperature and the internal temperature of the materials is easy to occur, so that the test precision is difficult to ensure. For smaller samples, for example: samples from triaxial compression tests, this difference is negligible; but for larger samples, for example: the difference is not negligible for the test pieces of the static cone penetration model test.
Disclosure of Invention
The utility model aims to provide a static cone penetration test device under a stable and uniform temperature field so as to provide a stable and uniform temperature field for completing a static cone penetration model test taking the soil temperature effect into consideration.
For this purpose, the above object of the present utility model is achieved by the following technical solutions:
the utility model provides a static cone penetration test device under stable even temperature field which characterized in that: the static cone penetration test device under the stable and uniform temperature field comprises a test container, a temperature control system and a loading system;
the test container consists of a stainless steel outer cylinder, an aluminum alloy inner cylinder and an aluminum alloy hollow inner column; a sample chamber is arranged inside the aluminum alloy inner cylinder, and a drainage layer is paved at the bottom of the aluminum alloy inner cylinder; the bottom plate of the aluminum alloy inner cylinder is provided with a drain hole and is connected with a plastic drain pipe;
the temperature control system comprises an edge heating device, a center heating device, a top heat preservation device, a bottom heat preservation device, at least three circles of temperature sensors and a temperature control device;
the edge heating device consists of a series of electric heating tubes which are uniformly arranged, and is arranged on the outer side of the aluminum alloy inner cylinder of the test container, and a heat insulation material is filled between the electric heating tubes and the stainless steel outer cylinder at intervals;
the central heating device consists of a series of electric heating tubes which are uniformly arranged and is arranged on the inner side of an aluminum alloy hollow inner column of the test container;
the edge heating device and the center heating device are connected to the temperature control device through an integrated circuit;
the top heat preservation device and the bottom heat preservation device are respectively composed of a heat preservation electric heating tube and a heat preservation and insulation layer and are respectively arranged on the upper surface of a top loading plate and the lower surface of an aluminum alloy inner cylinder bottom plate in the loading system;
the at least three circles of temperature sensors are coaxially and sequentially arranged from the outer side wall of the aluminum alloy hollow inner column of the test container to the inner side wall of the aluminum alloy inner cylinder;
the temperature control device is used for adjusting and setting the temperature and displaying the readings of the temperature sensors and the numerical value of the set temperature.
The utility model can also adopt or combine the following technical proposal when adopting the technical proposal:
as a preferred technical scheme of the utility model: the loading system comprises a static sounding probe, a top loading plate, a displacement sensor, a driving device, a reaction frame, a loading control device and a data acquisition system;
the upper end part of the static cone penetration probe is provided with a pressure sensor which is connected with a data acquisition system through a wire and is used for measuring penetration resistance in the penetration process; the lower end part of the static cone penetration probe is provided with a temperature sensor and a pore pressure sensor, and the temperature sensor and the pore pressure sensor penetrate through a hollow rod through wires and are connected with a data acquisition system, and are used for measuring the temperature and pore water pressure in the penetrating process;
the top loading plate is an aluminum alloy circular plate, and is provided with a drain hole and a detachable penetrating hole;
the displacement sensor is connected with the data acquisition system through a wire and is used for measuring displacement during penetration;
the driving device is connected with the loading control device through a wire, and is used for controlling the top loading plate to carry out consolidation loading and controlling penetration of the static cone penetration probe, so that force control loading and displacement control loading can be realized.
As a preferred technical scheme of the utility model: the static cone penetration probe is a hollow round rod, and the lower end of the static cone penetration probe is a cone with a vertex angle of 60 degrees.
As a preferred technical scheme of the utility model: the reaction frame is provided with a top turntable and rotating steel balls, a driving device is arranged below the top turntable, and the driving device is used for driving a static penetration probe to penetrate through in a static penetration way; the top turntable is matched with the rotating steel column to realize the circumferential movement of the static cone penetration test probe along the top turntable.
As a preferred technical scheme of the utility model: and a radial slideway is arranged below the top turntable and is used for providing a track for the static cone penetration probe to move radially.
Through the cooperation of circumferential movement and radial movement, the static cone penetration probe can be switched among the penetration holes.
As a preferred technical scheme of the utility model: the heat preservation and insulation layer is a polytetrafluoroethylene plate, the thickness is 1 cm, and a groove is reserved on the bottom surface and used for accommodating a heat preservation electric heating tube.
As a preferred technical scheme of the utility model: the heat insulation material is powdery polytetrafluoroethylene.
As a preferred technical scheme of the utility model: the heat-preservation electric heating tube is a dry-heating electric heating tube, is connected with a power supply through a lead, has a working voltage of 220V and rated power of 300W.
As a preferred technical scheme of the utility model: the electric heating tube is a dry heating electric heating tube, is connected with a power supply through a lead, has a working voltage of 220V and rated power of 1 kW.
The utility model provides a static cone penetration test device under a stable and uniform temperature field, which is provided with a temperature control system, wherein the temperature control system comprises an edge heating device, a central heating device, a top heat preservation device, a bottom heat preservation device, at least three circles of temperature sensors and a temperature control device, and soil is in a uniform temperature field by switching between two heat sources of the central heating device and the edge heating device; in addition, dissipation of heat is counteracted by the low-power electric heating tube, so that the soil body is ensured to be in a relatively stable temperature field. In addition, through setting up the loading system of top carousel, rotation steel ball and/or radial slide, can realize that static cone penetration probe switches among a plurality of penetration points, different penetration rates, carry out the penetration to the soil body of different super concretion degree. The utility model can be used for carrying out a static cone penetration test under the temperature control condition and is used for researching the influence of the temperature effect of the soil on the resistance of the cone tip of the static cone penetration, the hole pressure of the cone shoulder and the friction of the side wall.
Drawings
FIG. 1 is a front cross-sectional view of a static cone penetration test device under a stable and uniform temperature field provided by the utility model;
FIG. 2 is a top view of the static cone penetration test device under a stable and uniform temperature field provided by the utility model;
FIG. 3 is a plan view of a cross section of a temperature sensor;
FIG. 4 is a flow chart of a built-in temperature control program of the temperature control device;
in the figure: 1-1 is a stainless steel outer cylinder; 1-2 is an aluminum alloy inner cylinder; 1-3 is an aluminum alloy hollow inner column; 1-4 are sample chambers; 1-5 is a drainage layer; 1-6 are plastic drain pipes; 2-1 is a static cone penetration probe; 2-2 is a top load plate; 2-3 is a displacement sensor; 2-4 are driving devices; 2-5 is a reaction frame; 2-6 are loading control devices; 2-7 is a data acquisition system; 2-8 are pressure sensors; 2-9 are temperature sensors; 2-10 are pore pressure sensors; 2-11 are detachable penetration holes; 2-12 are drain holes; 2-13 are top turntables; 2-14 are rotating steel balls; 2-15 are radial slide ways; 3-1 is an edge heating device; 3-2 is a central heating device; 3-3 is a top thermal insulation device; 3-4 is a bottom heat preservation device; 3-5 is a temperature sensor A;3-6 is a temperature sensor B;3-7 is a temperature sensor C;3-8 are heat insulation materials; 3-9 are temperature control devices; 3-10 is a heat preservation electric heating tube; 3-11 is a heat preservation and insulation layer.
Detailed Description
The utility model will be described in further detail with reference to the drawings and specific embodiments.
Referring to fig. 1 to 4, a static cone penetration test device under a stable and uniform temperature field can be used for making a soil body in a stable and uniform temperature field so as to study the influence of the temperature effect of the soil body on cone tip resistance, cone shoulder hole pressure and side wall friction of the static cone penetration test device.
The static sounding test device under the stable and uniform temperature field comprises a test container, a temperature control system and a loading system.
The test container comprises a stainless steel outer cylinder 1-1, an aluminum alloy inner cylinder 1-2 and an aluminum alloy hollow inner column 1-3; the inside of the aluminum alloy inner cylinder is provided with a sample chamber 1-4 for placing a test soil sample, and the bottom of the aluminum alloy inner cylinder is paved with a drainage layer 1-5 for draining water in the soil sample consolidation process; the bottom plate of the aluminum alloy inner cylinder is provided with a drain hole, and is connected with a plastic drain pipe 1-6 for draining water in the soil sample consolidation process.
The loading system comprises a static cone penetration probe 2-1, a top loading plate 2-2, a displacement sensor 2-3, a driving device 2-4, a reaction frame 2-5, a loading control device 2-6 and a data acquisition system 2-7; the static cone penetration probe 2-1 is a hollow round rod, the lower end is a cone with a vertex angle of 60 degrees, the upper end is provided with a pressure sensor 2-8, the pressure sensor is connected with a data acquisition system through a wire and is used for measuring penetration resistance in the penetration process, the lower end is provided with a temperature sensor 2-9 and a pore pressure sensor 2-10, and the temperature sensor 2-9 and the pore pressure sensor are connected with the data acquisition system through wires and penetrate through the hollow rod and are used for measuring temperature and pore water pressure in the penetration process; the top loading plate 2-2 is an aluminum alloy circular plate, is provided with a detachable penetrating hole 2-11 and a drain hole 2-12, and is provided with a heat insulation layer on the top and bottom surfaces. The displacement sensor 2-3 is connected with the data acquisition system through a wire and is used for measuring the displacement during penetration; the driving device 2-4 is connected with the loading control device 2-6 through a lead and is used for controlling the top loading plate 2-2 to carry out consolidation loading and controlling the penetration of the static cone penetration probe 2-1, so that force control loading and displacement control loading can be realized; the counterforce frame 2-5 is made of stainless steel, and is provided with a top turntable 2-13 and a rotating steel ball 2-14 so as to realize the circumferential movement of the static cone penetration probe; the top turntable 2-13 is provided with a driving device 2-4 and a radial slideway 2-15 at the bottom through bolts, and is used for realizing radial movement of the static sounding probe 2-1 and completing the switching of the static sounding probe 2-1 between penetrating holes through radial movement and axial movement.
The temperature control system comprises an edge heating device 3-1, a central heating device 3-2, a top heat preservation device 3-3, a bottom heat preservation device 3-4 and three circles of temperature sensors 3-5, 3-6 and 3-7; the edge heating device 3-1 consists of a series of electric heating tubes which are uniformly arranged, and is arranged outside the aluminum alloy inner cylinder, and the space between the edge heating device and the stainless steel outer cylinder is filled with a heat insulation material 3-8; the central heating device 3-2 consists of a series of electric heating tubes which are uniformly arranged and is arranged on the inner side of the aluminum alloy hollow inner column; the edge heating device 3-1 and the central heating device 3-2 are connected to the temperature control device 3-9 through an integrated circuit; the top heat preservation device 3-3 and the bottom heat preservation device 3-4 are composed of a heat preservation electric heating tube 3-10 and a heat preservation and insulation layer 3-11, and are respectively mounted on the upper surface of the top loading plate 2-2 and the lower surface of the bottom plate of the aluminum alloy inner cylinder 1-2 by sticking or using bolts; the heat preservation and insulation layer 3-11 is made of polytetrafluoroethylene plate with the thickness of 1 cm, and a groove is preset on the bottom surface for arranging the heat preservation and insulation electric heating tube 3-10; the heat-preserving electrothermal tube 3-10 is a dry-heating electrothermal tube, which is connected with a power supply through a lead, has a working voltage of 220V and rated power of 300W; the temperature sensors 3-5, 3-6 and 3-7 are sequentially arranged from the edge to the center of the sample chamber; the electric heating tube is a dry heating electric heating tube, is connected with a power supply through a lead, has the working voltage of 220V and the rated power of 1 kW; the thickness of the interval (the space between the electric heating tube and the stainless steel outer cylinder) is at least 5 mm; the heat insulating material 3-8 is powdery polytetrafluoroethylene; the temperature control device 3-9 is used for adjusting and setting the temperature and displaying the readings of each temperature sensor and the numerical value of the set temperature.
Specifically, the static cone penetration test method based on the static cone penetration test device under the stable and uniform temperature field comprises the following steps:
s1: preparing a test soil sample and instruments and equipment required by the test;
s2: filling test soil samples into the sample chambers 1-4 in a layered manner, and embedding temperature sensors 3-5, 3-6 and 3-7;
s3: the driving device 2-4 is controlled by the loading control device 2-6, pressure is applied by the top loading plate 2-2, and after the soil sample is consolidated stably, soil bodies with different super consolidation degrees can be simulated by unloading;
s4: adjusting a temperature control device 3-9, and setting a test temperature;
specifically, the temperature control device controls the temperature by:
s41: the user inputs a test temperature T ℃;
s42: indication T of judging temperature sensor A, B, C A 、T B 、T C Size relation with T;
if the temperature is greater than T, all the heating devices and the heat preservation devices are closed to dissipate heat;
if equal to T, jumping to step S45;
if less than T, go on downward from step S43;
s43: opening an edge heating device to heat the soil sample from the edge to the center;
s44: when the indication number of the temperature sensor A to be detected is slightly lower than the set temperature of 0.95T, at least T-1.5 ɛ ℃, closing the edge heating device and starting the central heating device to heat the soil sample from the central line edge;
s45: when the temperature sensor A, B, C is detected to reach the set temperature T ℃, the central heating device is closed, and the top heat preservation device and the bottom heat preservation device are opened to maintain the temperature of the soil sample;
s46: in the heat preservation stage, if the indication of the temperature sensor A, B, C is detected to be T- ɛ ℃, the step S43 is skipped for heating;
s5: when the soil temperature reaches the test temperature, maintaining the soil sample at the test temperature until the thermal consolidation of the soil sample is completed;
s6: aligning the static cone penetration probe with a certain detachable penetration hole through the top turntable 2-13 and the radial slide way 2-16, and after the detachable penetration hole is detached, controlling the driving device 2-4 through the loading control device 2-6 to drive a certain penetration rate of the static cone penetration probe to move downwards so as to finish one penetration;
s7: and S6, replacing the penetration holes and the penetration rate to complete all penetration.
The above detailed description is intended to illustrate the present utility model by way of example only and not to limit the utility model to the particular embodiments disclosed, but to limit the utility model to the precise embodiments disclosed, and any modifications, equivalents, improvements, etc. that fall within the spirit and scope of the utility model as defined by the appended claims.
Claims (9)
1. The utility model provides a static cone penetration test device under stable even temperature field which characterized in that: the static cone penetration test device under the stable and uniform temperature field comprises a test container, a temperature control system and a loading system;
the test container consists of a stainless steel outer cylinder, an aluminum alloy inner cylinder and an aluminum alloy hollow inner column; a sample chamber is arranged inside the aluminum alloy inner cylinder, and a drainage layer is paved at the bottom of the aluminum alloy inner cylinder; the bottom plate of the aluminum alloy inner cylinder is provided with a drain hole and is connected with a plastic drain pipe;
the temperature control system comprises an edge heating device, a center heating device, a top heat preservation device, a bottom heat preservation device, at least three circles of temperature sensors and a temperature control device;
the edge heating device consists of a series of electric heating tubes which are uniformly arranged, and is arranged on the outer side of the aluminum alloy inner cylinder of the test container, and a heat insulation material is filled between the electric heating tubes and the stainless steel outer cylinder at intervals;
the central heating device consists of a series of electric heating tubes which are uniformly arranged and is arranged on the inner side of an aluminum alloy hollow inner column of the test container;
the edge heating device and the center heating device are connected to the temperature control device through an integrated circuit;
the top heat preservation device and the bottom heat preservation device are respectively composed of a heat preservation electric heating tube and a heat preservation and insulation layer and are respectively arranged on the upper surface of a top loading plate and the lower surface of an aluminum alloy inner cylinder bottom plate in the loading system;
the at least three circles of temperature sensors are coaxially and sequentially arranged from the outer side wall of the aluminum alloy hollow inner column of the test container to the inner side wall of the aluminum alloy inner cylinder;
the temperature control device is used for adjusting and setting the temperature and displaying the readings of the temperature sensors and the numerical value of the set temperature.
2. The static cone penetration test device under a stable and uniform temperature field according to claim 1, wherein: the loading system comprises a static sounding probe, a top loading plate, a displacement sensor, a driving device, a reaction frame, a loading control device and a data acquisition system;
the upper end part of the static cone penetration probe is provided with a pressure sensor, the pressure sensor is connected with the data acquisition system through a wire, the lower end part of the static cone penetration probe is provided with a temperature sensor and a pore pressure sensor, and the temperature sensor and the pore pressure sensor penetrate through a hollow rod through the wire and are connected with the data acquisition system;
the top loading plate is an aluminum alloy circular plate, and is provided with a drain hole and a detachable penetrating hole;
the displacement sensor is connected with the data acquisition system through a wire;
the driving device is connected with the loading control device through a wire, and is used for controlling the top loading plate to carry out consolidation loading and controlling penetration of the static cone penetration probe, so that force control loading and displacement control loading can be realized.
3. The static cone penetration test device under a stable and uniform temperature field according to claim 2, wherein: the static cone penetration probe is a hollow round rod, and the lower end of the static cone penetration probe is a cone with a vertex angle of 60 degrees.
4. The static cone penetration test device under a stable and uniform temperature field according to claim 2, wherein: the reaction frame is provided with a top turntable and rotating steel balls, a driving device is arranged below the top turntable, and the driving device is used for driving a static penetration probe to penetrate through in a static penetration way; the top turntable is matched with the rotating steel column to realize the circumferential movement of the static cone penetration test probe along the top turntable.
5. The static cone penetration test device under a stable and uniform temperature field according to claim 4, wherein: and a radial slideway is arranged below the top turntable and is used for providing a track for the static cone penetration probe to move radially.
6. The static cone penetration test device under a stable and uniform temperature field according to claim 1, wherein: the heat preservation and insulation layer is a polytetrafluoroethylene plate, and a groove is reserved on the bottom surface and used for accommodating a heat preservation electric heating tube.
7. The static cone penetration test device under a stable and uniform temperature field according to claim 1, wherein: the heat insulation material is powdery polytetrafluoroethylene.
8. The static cone penetration test device under a stable and uniform temperature field according to claim 1, wherein: the heat-preservation electric heating tube is a dry-heating electric heating tube, is connected with a power supply through a lead, has a working voltage of 220V and rated power of 300W.
9. The static cone penetration test device under a stable and uniform temperature field according to claim 1, wherein: the electric heating tube is a dry heating electric heating tube, is connected with a power supply through a lead, has a working voltage of 220V and rated power of 1 kW.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321103006.2U CN219951879U (en) | 2023-05-06 | 2023-05-06 | Static sounding test device under stable even temperature field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321103006.2U CN219951879U (en) | 2023-05-06 | 2023-05-06 | Static sounding test device under stable even temperature field |
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| Publication Number | Publication Date |
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| CN219951879U true CN219951879U (en) | 2023-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321103006.2U Active CN219951879U (en) | 2023-05-06 | 2023-05-06 | Static sounding test device under stable even temperature field |
Country Status (1)
| Country | Link |
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| CN (1) | CN219951879U (en) |
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2023
- 2023-05-06 CN CN202321103006.2U patent/CN219951879U/en active Active
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