CN107167577B - Temperature control model test device - Google Patents
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- CN107167577B CN107167577B CN201710376354.XA CN201710376354A CN107167577B CN 107167577 B CN107167577 B CN 107167577B CN 201710376354 A CN201710376354 A CN 201710376354A CN 107167577 B CN107167577 B CN 107167577B
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Abstract
The invention discloses a temperature control model test device which comprises a heating mechanism and a pressurizing mechanism, wherein the heating mechanism comprises a heating barrel, a water circulation heater and a cover plate, the heating barrel is made of metal, a closed annular heating cavity is arranged on the peripheral wall of the heating barrel, a water inlet and a water outlet are respectively formed in the peripheral wall of the heating barrel, the water inlet is communicated with the water outlet end of the water circulation heater, the water outlet end is communicated with the water inlet end of the water circulation heater, after soft soil is filled in the heating barrel, a water-passing or water-isolating transition layer is laid on the soft soil, the cover plate is placed on the transition layer and provided with a plurality of water guide holes, settlement meters are respectively installed on two sides of the cover plate, and the pressurizing mechanism is positioned right. Through the temperature of soft soil foundation in this test device can accurate control heating bucket, accomplish soil sample consolidation test under specific temperature and the different temperatures, the development change law of temperature, pore pressure, the settlement of the soft soil foundation of reasonable, reliable analysis under the external heating source of true simulation soil body.
Description
Technical Field
The invention relates to a soil body test device, in particular to a temperature control model test device.
Background
Deep soft soil layers are widely distributed in the underground of coastal areas of China (such as Ningbo city in the southeast coastal region) and in a plurality of inland cities. The soft soil is characterized by high compressibility and low permeability, so that the problem of long-term settlement caused by the high compressibility and low permeability is a very concerned and challenging subject in both theoretical and engineering circles. Temperature is a basic physical quantity in nature, the research on physical and mechanical properties of materials at different temperatures is an important research direction of the current material discipline, and the influence of temperature load on the mechanical properties of soft soil and soft soil foundations is an important subject in the field of geotechnical engineering in recent years. Therefore, it becomes important to study the soft soil property after heating and the compression property of the soft soil foundation.
By consulting the existing documents at home and abroad, the soil engineering tester is found to be capable of controlling and heating the temperature of the soil sample, and the heating modes mainly comprise the following three modes.
(1) The pressure chamber is placed in a heating mode in an oven (chamber). The heating mode does not require modification to conventional test equipment, but rather achieves the test temperature requirements by placing the tester in a high temperature environment. Although the heating mode omits the development process of the instrument, a temperature control laboratory needs to be established, the cost for establishing the temperature control laboratory is high, the test environment is poor, and the requirement on high temperature resistance of each element of the instrument is high.
(2) A heating mode in the pressure chamber. The heating mode adopts the heating coil, the heating pipe, the heating rod and the heating plate to directly heat the fluid, can better meet the requirement of test temperature, but is not easy to uniformly heat the liquid in the pressure chamber under high confining pressure, and is easy to cause uneven temperature of the soil sample.
(3) A pressure outdoor heating mode. And winding a coil outside the pressure chamber, and heating the fluid in the pressure chamber through a heating coil. For example, the temperature of the liquid in the pressure chamber is increased due to the need to transfer heat through the housing, but the time required for the soil sample to reach the target temperature is longer.
It should be noted that, the traditional soft soil consolidation apparatus and the temperature-controlled soft soil consolidation apparatus designed and developed in recent years can only study the consolidation compression characteristics of the unit body soil sample at room temperature and a certain temperature. In an actual state, the size of a foundation soil body is large, and the temperature is variable; soft soil and soft soil foundations under different sizes and different temperature conditions are likely to exhibit different properties, and existing soft soil consolidators are unable to simulate the true compression characteristics of soft soil foundations under different temperature conditions.
CN104502562A discloses a shaft drainage consolidation soft foundation treatment model test device and test method, characterized in that a drainage shaft is arranged in the box body of the model test box, a soft soil foundation is filled between the box body and the shaft, a hole pressure-temperature integrated sensor is arranged in the soft soil foundation, a horizontal sand cushion layer, a steel plate and a settlement gauge are arranged on the soft soil foundation, a dowel bar is fixedly arranged on the steel plate, the lower end of a jack is connected with the dowel bar, the upper end of the jack is movably connected with a loading lever, one end of the loading lever is hinged with a reaction frame, and the other end of the loading lever is provided with a hook, the test method is that a PVC pipe and a U-shaped heat conduction pipe are fixed in the model test box, soft clay is filled, the hole pressure and the temperature sensor are embedded, a computer-type water circulation heater is started, hot water in the U-shaped heat conduction pipe is utilized to heat and load soil samples in stages, the, the method has the advantage of reasonably and reliably analyzing the development and change rules of temperature, pore pressure and settlement of the shaft foundation. Although the test device and the test method consider factors such as temperature change, soil body size and the like, the U-shaped pipe heating mode adopted by the test device cannot provide large-area uniform heating and cannot achieve the purpose of uniform heating of the soil body, so that the properties of the heated soil body cannot be comprehensively and deeply known. In addition, the consolidation compression characteristics of the soft soil foundation after the coupling temperature cannot be comprehensively, deeply and reliably known because the metal pipe is inserted into the soft soil foundation soil and the consolidation compression characteristics of the foundation are affected. Therefore, the research and development of the temperature control model test device which is simple in operation, strong in applicability, small in interference factor and capable of enabling the soil body to achieve the purpose of uniform heating in a short time becomes important.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the testing device is simple in structure, low in cost, convenient to use, consider the temperature change of the soil body, factors such as the size of a foundation model and the like, the drainage mode is controllable, the foundation model can be segmented, graded, linearly heated and cooled through the testing device, the temperature of the soft soil foundation in the heating barrel is accurately controlled, the temperature is kept stable, the soil sample consolidation test at specific temperature and different temperatures can be completed, the characteristic of the soil body under an external heating source is truly simulated, and the development change rule of the temperature, the pore pressure and the settlement of the soft soil foundation is reasonably and reliably analyzed.
The technical scheme adopted by the invention for solving the technical problems is as follows: the utility model provides a control by temperature change model test device, includes heating mechanism and loading system, heating mechanism include heating barrel, hydrologic cycle heater and the apron that the metal was made, the perisporium of heating barrel on be provided with inclosed annular heating chamber, the perisporium of heating barrel on seted up water inlet and delivery port respectively, the water inlet with hydrologic cycle heater's play water end be linked together, the delivery port with hydrologic cycle heater's the end of intaking be linked together, the heating barrel be used for filling the weak soil, the heating barrel in fill after the weak soil on lay logical water or water-proof transition layer the transition layer on place the apron, the apron on seted up a plurality of water guide holes, loading system be located directly over the apron.
The temperature control model test device has the advantages of simple structure, low cost and convenient use. When the device is used, soft soil is filled in the heating barrel, the transition layer is laid on the soft soil, the cover plate is placed on the transition layer to establish a soft soil foundation model, then hot water is introduced into the annular heating cavity on the heating barrel through the water circulation heater, the temperature of the hot water is controllable, the soft soil is heated through the hot water, and finally the cover plate is pressurized through the pressurizing mechanism to detect the performance of the soil sample at a specific temperature or the water temperature is adjusted through the water circulation heater to detect the performance of the soil sample at different temperatures. The drainage mode of the temperature control model test device is controllable, and foundation models of various sizes can be obtained through the size design of the heating barrel. According to the practical application requirement, after the heating barrel is filled with the soft soil, a water-permeable or water-impermeable transition layer can be laid on the soft soil to perform the test under the condition of horizontal single-side drainage or no drainage.
According to the temperature control model test device, the foundation model is heated by the annular heating cavity arranged on the peripheral wall of the heating barrel, so that the foundation model can be uniformly heated, and the barrel wall area of the heating barrel is large, so that the heat source area is large, and the foundation model can be comprehensively, quickly and uniformly heated. When the foundation model is heated, the heat source is arranged outside the foundation model and does not directly contact with the soil body, so that disturbance to the soil body is avoided, the influence of external factors on the soil body can be effectively reduced, and the reliability of a test result is improved. This control by temperature change model test device's heating mechanism can realize the segmentation, grading, the linear heating and the cooling to the ground model, and the temperature of soft soil foundation in the accurate control heating bucket keeps the temperature stable. The temperature control model test device can complete soil sample consolidation tests at specific temperature and different temperatures, truly simulate the characteristics of soil mass under an external heating source, reasonably and reliably analyze the development and change rules of temperature, pore pressure and settlement of a soft foundation, provide technical parameters for the application design and construction of a soft foundation treatment hot drainage consolidation method in engineering, and disclose the action mechanism of hot drainage consolidation soft foundation treatment in engineering application and the consolidation effect of the foundation.
The heating barrel comprises an inner barrel and an outer barrel arranged on the outer side of the inner barrel, the upper parts of the inner barrel and the outer barrel are both provided with openings, the outer side surface of the inner barrel and the inner side surface of the outer barrel enclose the annular heating cavity, the upper end of the annular heating cavity is sealed by an annular sealing plate, and the water inlet and the water outlet are respectively arranged on two sides of the annular sealing plate. The heating barrel composed of the inner barrel and the outer barrel is simple in structure, easy to machine and form and convenient for batch production.
The outer side of the outer barrel is provided with a barrel-shaped heat preservation layer with an opening at the upper part. The barrel-shaped heat-insulating layer can be made of the existing heat-insulating materials, such as thick sponge heat-insulating materials wrapped with tinfoil, rock wool heat-insulating materials, glass wool heat-insulating materials and the like.
A gap is arranged between the bottom wall of the inner barrel and the bottom wall of the outer barrel, the annular heating cavity is communicated with the gap, a water drainage port is arranged at the lower part of the side wall of the outer barrel, and a water drainage faucet is arranged at the water drainage port. The setting in clearance is convenient for heat the ground model from the bottom, and further increase heat source area improves the heating effect, makes the ground model be heated more evenly. The water discharging faucet is convenient for discharging residual water in the annular heating cavity after the test is finished out of the heating barrel in time.
The water guide plate is arranged in the gap, the thickness of the water guide plate is the same as the height of the gap, a plurality of first water passing grooves which are communicated from left to right and a plurality of second water passing grooves which are communicated from front to back are formed in the lower portion of the water guide plate, and the plurality of first water passing grooves and the plurality of second water passing grooves are staggered transversely and longitudinally and communicated with each other. Because of filling the heating bucket weight behind the soft soil great, the water deflector plays the effect of the interior bucket of further support to guarantee the stability of heating barrel head portion, ensure reliability and the accuracy of test result. Meanwhile, the arrangement of the first water passing grooves and the second water passing grooves which are staggered transversely and longitudinally and are communicated mutually ensures the normal and effective circulation of water flow on the peripheral wall and the bottom of the inner barrel, and realizes the all-round heating of the periphery and the bottom of the inner barrel.
The inner chamber of interior bucket in be provided with a plurality of temperature pressure sensor, the bottom interval of interior bucket install a plurality ofly temperature pressure sensor, the weak soil in the interval bury underground and be a plurality of temperature pressure sensor, the both sides of apron install the settlement gauge respectively. Temperature and pore pressure sensors are mounted at different positions of an inner cavity of the inner barrel, so that the temperature and pore pressure of different positions of a soil sample can be monitored, and meanwhile, the settlement data of settlement meters at two sides of the cover plate are recorded respectively, so that the development and change rules of the temperature, the pore pressure and the settlement can be known better, and a basis is provided for hot drainage consolidation soft foundation treatment in engineering application.
The transition layer is a sand cushion layer; or the transition layer consists of a waterproof plastic layer and a sand cushion layer paved on the plastic layer, sealing rings are arranged on the periphery of the plastic layer, and the sealing rings are arranged at the joint of the plastic layer and the inner wall of the inner barrel. When the test under the horizontal single face drainage condition is carried out, directly lay the sand cushion layer on the soft soil to place the apron on the sand cushion layer, the effect of apron is at this moment and is acted as drainage channel and makes the soil body evenly pressurized, and the water in the soft soil can be discharged upwards in the foundation model rapidly effectively in the test process. When the test is carried out under the condition of no drainage, firstly, a waterproof plastic layer is laid on the soft soil, a sealing ring is additionally arranged at the joint of the plastic layer and the inner wall of the inner barrel, then, a sand cushion layer is laid on the plastic layer, and then, a cover plate is placed on the plastic layer, and the cover plate is used for enabling the soil body to be uniformly pressed. The plastic layer and the sealing ring can bear the high temperature of 0-80 ℃. The sand cushion layer has two functions, namely draining water and uniformly stressing a soil body.
The loading device comprises a pressurizing mechanism, a heating barrel, a rotating shaft, a heating barrel, a lever, a jack and a force transmission frame, wherein the force transmission frame is arranged above the heating barrel, one end of the lever is connected with the force transmission frame in a rotating mode through the rotating shaft, the other end of the lever is provided with a hook for loading weights, the lever is movably connected with the upper end of the jack through a hemispherical hinged support, the lower end of the jack is connected with the force transmission frame, and the force transmission frame is located above the cover plate. The soil body can be stably pressed through the pressurizing mechanism.
The hook is provided with a weight hanging disc for placing weights in a hanging mode.
The heating barrel is arranged on a bottom plate, and the bottom plate is fixed on the ground.
Compared with the prior art, the invention has the advantages that: the temperature control model test device disclosed by the invention has the advantages of simple structure, low cost and convenience in use, and takes factors such as soil body temperature change, foundation model size and the like into consideration, the foundation model can be uniformly heated by heating the foundation model through the annular heating cavity arranged on the peripheral wall of the heating barrel, the barrel wall area of the heating barrel is large, and therefore, the heat source area is large, so that the foundation model can be comprehensively, quickly and uniformly heated, and the drainage mode is controllable. The temperature control model test device can realize segmentation, classification, linear heating and cooling of the foundation model, accurately control the temperature of the soft soil foundation in the heating barrel, keep the temperature stable, and also can complete soil sample consolidation tests at specific temperature and different temperatures, truly simulate the characteristics of soil mass under an external heating source, reasonably and reliably analyze the development and change rules of the temperature, pore pressure and settlement of the soft soil foundation, provide technical parameters for the application design and construction of a soft foundation treatment hot drainage consolidation method in engineering, and disclose the action mechanism of hot drainage consolidation soft foundation treatment in engineering application and the consolidation effect of the foundation.
Drawings
FIG. 1 is a schematic structural diagram of a temperature control model test apparatus in an embodiment under a non-drainage condition;
FIG. 2 is an enlarged view of FIG. 1 at A;
FIG. 3 is a schematic structural view of a heating barrel in an embodiment;
FIG. 4 is an external view of the cover plate in the embodiment;
FIG. 5 is a bottom view of the water guide plate in the embodiment;
FIG. 6 is a schematic structural view of a soft soil foundation model in a heating barrel under a lateral single-sided drainage condition;
fig. 7 is a schematic structural view of a soft soil foundation model in a heating bucket under a non-drainage condition.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
The temperature control model test device according to the first embodiment, as shown in the figure, includes a heating mechanism and a pressurizing mechanism, the heating mechanism includes a heating barrel 1 made of metal, a water circulation heater 2 and a cover plate 3, a closed annular heating cavity 13 is provided on the circumferential wall of the heating barrel 1, a water inlet 14 and a water outlet 15 are respectively provided on the circumferential wall of the heating barrel 1, the water inlet 14 is communicated with the water outlet end of the water circulation heater 2 through a hose 16, the water outlet 15 is communicated with the water inlet end of the water circulation heater 2 through the hose 16, the heating barrel 1 is used for filling a soft soil 4, after the soft soil 4 is filled in the heating barrel 1, a transition layer 5 is laid on the soft soil 4, the cover plate 3 is placed on the transition layer 5, a plurality of water guide holes 31 are provided on the cover plate 3, and the.
In the first embodiment, the heating barrel 1 includes an inner barrel 11 and an outer barrel 12 disposed outside the inner barrel 11, both the inner barrel 11 and the outer barrel 12 have openings at upper portions thereof, an outer side surface of the inner barrel 11 and an inner side surface of the outer barrel 12 define an annular heating cavity 13, an upper end of the annular heating cavity 13 is sealed by an annular sealing plate 17, an outer side of the annular sealing plate 17 is welded to the outer barrel 12, an inner side of the annular sealing plate 17 is welded to the inner barrel 11, and a water inlet 14 and a water outlet 15 are respectively disposed at two sides of the annular sealing plate. The outer side of the outer barrel 12 is provided with a barrel-shaped insulating layer 18 with an upper opening.
The temperature control model test device according to the second embodiment, as shown in the figure, includes a heating mechanism and a pressurizing mechanism, the heating mechanism includes a heating barrel 1 made of metal, a water circulation heater 2 and a cover plate 3, the heating barrel 1 is disposed on a bottom plate 19, the bottom plate 19 is fixed on the ground, a closed annular heating cavity 13 is disposed on the circumferential wall of the heating barrel 1, a water inlet 14 and a water outlet 15 are respectively disposed on the circumferential wall of the heating barrel 1, the water inlet 14 is communicated with the water outlet end of the water circulation heater 2 through a hose 16, the water outlet 15 is communicated with the water inlet end of the water circulation heater 2 through a hose 16, the heating barrel 1 is used for filling a soft soil 4, after the soft soil 4 is filled in the heating barrel 1, a transition layer 5 is laid on the soft soil 4, the cover plate 3 is disposed on the transition layer 5, a plurality of water guide holes 31 are disposed on.
In the second embodiment, the heating barrel 1 includes an inner barrel 11 and an outer barrel 12 disposed outside the inner barrel 11, the upper portions of the inner barrel 11 and the outer barrel 12 are open, the outer side surface of the inner barrel 11 and the inner side surface of the outer barrel 12 enclose an annular heating cavity 13, the upper end of the annular heating cavity 13 is sealed by an annular sealing plate 17, the outer side of the annular sealing plate 17 is welded on the outer barrel 12, the inner side of the annular sealing plate 17 is welded on the inner barrel 11, and the water inlet 14 and the water outlet 15 are respectively disposed on two sides of the annular sealing plate 17. The outer side of the outer barrel 12 is provided with a barrel-shaped insulating layer 18 with an upper opening. A plurality of temperature and pressure sensors 6 are arranged in the inner cavity of the inner barrel 11, a plurality of temperature and pressure sensors 6 are installed at the bottom of the inner barrel 11 at intervals, a plurality of temperature and pressure sensors 6 are embedded in the soft soil 4 at intervals, and settlement meters 32 are installed on two sides of the cover plate 3 respectively.
In the second embodiment, the pressurizing mechanism includes a reaction frame 81, a lever 82, a jack 83 and a force transmission frame 84, the reaction frame 81 is installed at one side of the heating barrel 1, one end of the lever 82 is rotatably connected with the reaction frame 81 through a rotating shaft, a hook 85 for loading a weight 87 is installed at the other end of the lever 82, a weight hanging tray 86 for placing the weight 87 is suspended on the hook 85, the lever 82 is movably connected with the upper end of the jack 83 through a hemispherical hinge support, the lower end of the jack 83 is connected with the force transmission frame 84, and the force transmission frame 84 is located right above the cover plate 3.
The temperature control model test device of the third embodiment, as shown in the figure, comprises a heating mechanism and a pressurizing mechanism, the heating mechanism comprises a heating barrel 1 made of metal, a water circulation heater 2 and a cover plate 3, the heating barrel 1 is arranged on a bottom plate 19, the bottom plate 19 is fixed on the ground, a closed annular heating cavity 13 is arranged on the circumferential wall of the heating barrel 1, a water inlet 14 and a water outlet 15 are respectively arranged on the circumferential wall of the heating barrel 1, the water inlet 14 is communicated with the water outlet end of the water circulation heater 2 through a hose 16, the water outlet 15 is communicated with the water inlet end of the water circulation heater 2 through a hose 16, the heating barrel 1 is used for filling soft soil 4, after the soft soil 4 is filled in the heating, lay the transition layer 5 of leading to water on soft soil 4, transition layer 5 is the sand cushion layer, places apron 3 on transition layer 5, has seted up a plurality of water guide holes 31 on the apron 3, and settlement gauge 32 is installed respectively to the both sides of apron 3.
In the third embodiment, the heating barrel 1 includes an inner barrel 11 and an outer barrel 12 disposed outside the inner barrel 11, both the inner barrel 11 and the outer barrel 12 have openings at upper portions thereof, an outer side surface of the inner barrel 11 and an inner side surface of the outer barrel 12 define an annular heating cavity 13, an upper end of the annular heating cavity 13 is sealed by an annular sealing plate 17, an outer side of the annular sealing plate 17 is welded to the outer barrel 12, an inner side of the annular sealing plate 17 is welded to the inner barrel 11, and a water inlet 14 and a water outlet 15 are respectively disposed at two sides of the annular sealing plate. A gap 7 is arranged between the bottom wall of the inner barrel 11 and the bottom wall of the outer barrel 12, the annular heating cavity 13 is communicated with the gap 7, a water drainage port is arranged at the lower part of the side wall of the outer barrel 12, and a water drainage faucet 10 is arranged at the water drainage port. The water guide plate 71 is arranged in the gap 7, the thickness of the water guide plate 71 is the same as the height of the gap 7, three first water through grooves 72 which are communicated left and right and three second water through grooves 73 which are communicated front and back are arranged at the lower part of the water guide plate 71, and the three first water through grooves 72 and the three second water through grooves 73 are staggered transversely and longitudinally and are communicated with each other. The outer side of the outer barrel 12 is provided with a barrel-shaped insulating layer 18 with an upper opening. A plurality of temperature and pressure sensors 6 are arranged in the inner cavity of the inner barrel 11, a plurality of temperature and pressure sensors 6 are installed at the bottom of the inner barrel 11 at intervals, a plurality of temperature and pressure sensors 6 are embedded in the soft soil 4 at intervals, and settlement meters 32 are installed on two sides of the cover plate 3 respectively.
In the third embodiment, the pressurizing mechanism includes a reaction frame 81, a lever 82, a jack 83 and a force transmission frame 84, the reaction frame 81 is installed at one side of the heating barrel 1, one end of the lever 82 is rotatably connected with the reaction frame 81 through a rotating shaft, a hook 85 for loading a weight 87 is installed at the other end of the lever 82, a weight hanging disc 86 for placing the weight 87 is suspended on the hook 85, the lever 82 is movably connected with the upper end of the jack 83 through a hemispherical hinge support, the lower end of the jack 83 is connected with the force transmission frame 84, and the force transmission frame 84 is located right above the cover plate 3.
The temperature control model test device of the fourth embodiment has substantially the same structure as the test device of the third embodiment, except that in the fourth embodiment, the transition layer 5 is a water-proof transition layer 5, the transition layer 5 is composed of a waterproof plastic layer 51 and a sand cushion layer laid on the plastic layer 51, a sealing ring 52 is arranged on the periphery of the plastic layer 51, and the sealing ring 52 is arranged at the joint of the plastic layer 51 and the inner wall of the inner barrel 11.
Taking the temperature control model test device of the third embodiment as an example, when the test is performed under the lateral single-sided drainage condition, as shown in fig. 6, the sand cushion 5 is directly laid on the soft soil 4 (for example, when the inner diameter of the inner barrel 11 is 40cm and the depth is 50cm, the thickness of the laid sand cushion 5 may be 6 to 10cm, the thick sponge heat insulating material wrapped with tinfoil with the thickness of 80mm may be adopted as the barrel-shaped heat insulating layer 18, and the loading amount of the weight 87 is 0 to 400kPa), and the cover plate 3 is placed on the sand cushion 5 to form a drainage system, so that water in the soft soil 4 can be quickly and effectively drained upwards from the foundation model in the test process.
Taking the temperature-controlled model test apparatus of the fourth embodiment as an example, when the test is performed under the non-drainage condition, as shown in fig. 7, a waterproof plastic layer 51 is first laid on the soft soil 4, a seal ring 52 is additionally installed at the joint of the plastic layer 51 and the inner wall of the inner barrel 11, a sand cushion layer 5 is first laid on the plastic layer 51, and then the cover plate 3 is placed, thereby forming a non-drainage system.
Taking the temperature control model test device of the third embodiment as an example, when the temperature control model test device is used, soft soil 4 is filled in the heating barrel 1, the transition layer 5 is laid on the soft soil 4, the cover plate 3 is placed on the transition layer 5, and a soft soil foundation model is established; then the heating temperature of the water circulation heater 2 is set (the specific temperature selection range is 0-80 ℃), hot water is introduced into the annular heating cavity 13 on the heating barrel 1 through the water circulation heater 2, the soft soil 4 is heated through the hot water, the cover plate 3 is pressurized through the pressurizing mechanism, the temperature and the pore pressure of different parts of the soil sample are monitored through the temperature and pressure sensor 6, meanwhile, the development and change rules of the temperature, the pore pressure and the sedimentation are known through respectively recording the sedimentation data of the sedimentation meters 32 on the two sides of the cover plate 3, and a basis is provided for hot drainage consolidation soft foundation treatment in engineering application.
The temperature control model test device can realize segmentation, classification, linear heating and cooling of the foundation model, accurately control the temperature of the soft soil foundation in the heating barrel, keep the temperature stable, also can finish soil sample consolidation tests at specific temperature and different temperatures, truly simulate the characteristics of soil mass under an external heating source, and reasonably and reliably analyze the development and change rules of the temperature, pore pressure and settlement of the soft soil foundation.
Claims (7)
1. The utility model provides a control by temperature change model test device, includes heating mechanism and loading system, its characterized in that: the heating mechanism comprises a heating barrel, a water circulation heater and a cover plate, wherein the heating barrel is made of metal, a closed annular heating cavity is arranged on the peripheral wall of the heating barrel, a water inlet and a water outlet are respectively formed in the peripheral wall of the heating barrel, the water inlet is communicated with the water outlet end of the water circulation heater, the water outlet is communicated with the water inlet end of the water circulation heater, the heating barrel is used for filling soft soil, after the soft soil is filled in the heating barrel, a water-through or water-proof transition layer is laid on the soft soil, the cover plate is placed on the transition layer, a plurality of water guide holes are formed in the cover plate, and the pressurizing mechanism is positioned right above the cover plate; the heating barrel comprises an inner barrel and an outer barrel arranged outside the inner barrel, the upper parts of the inner barrel and the outer barrel are both provided with openings, the outer side surface of the inner barrel and the inner side surface of the outer barrel enclose the annular heating cavity, the upper end of the annular heating cavity is sealed by an annular sealing plate, and the water inlet and the water outlet are respectively arranged on two sides of the annular sealing plate; a gap is formed between the bottom wall of the inner barrel and the bottom wall of the outer barrel, the annular heating cavity is communicated with the gap, a water drainage port is formed in the lower part of the side wall of the outer barrel, and a water drainage faucet is mounted at the water drainage port; the water guide plate is arranged in the gap, the thickness of the water guide plate is the same as the height of the gap, a plurality of first water passing grooves which are communicated from left to right and a plurality of second water passing grooves which are communicated from front to back are formed in the lower portion of the water guide plate, and the plurality of first water passing grooves and the plurality of second water passing grooves are staggered transversely and longitudinally and communicated with each other.
2. The temperature-controlled model test device of claim 1, wherein: the outer side of the outer barrel is provided with a barrel-shaped heat preservation layer with an opening at the upper part.
3. The temperature-controlled model test device of claim 1, wherein: the inner chamber of interior bucket in be provided with a plurality of temperature pressure sensor, the bottom interval of interior bucket install a plurality ofly temperature pressure sensor, the weak soil in the interval bury underground and be a plurality of temperature pressure sensor, the both sides of apron install the settlement gauge respectively.
4. The temperature-controlled model test device of claim 1, wherein: the transition layer is a sand cushion layer; or the transition layer consists of a waterproof plastic layer and a sand cushion layer paved on the plastic layer, sealing rings are arranged on the periphery of the plastic layer, and the sealing rings are arranged at the joint of the plastic layer and the inner wall of the inner barrel.
5. The temperature-controlled model test device of claim 1, wherein: the loading device comprises a pressurizing mechanism, a heating barrel, a rotating shaft, a heating barrel, a lever, a jack and a force transmission frame, wherein the force transmission frame is arranged above the heating barrel, one end of the lever is connected with the force transmission frame in a rotating mode through the rotating shaft, the other end of the lever is provided with a hook for loading weights, the lever is movably connected with the upper end of the jack through a hemispherical hinged support, the lower end of the jack is connected with the force transmission frame, and the force transmission frame is located above the cover plate.
6. The temperature-controlled model test device of claim 5, wherein: the hook is provided with a weight hanging disc for placing weights in a hanging mode.
7. The temperature-controlled model test device of claim 1, wherein: the heating barrel is arranged on a bottom plate, and the bottom plate is fixed on the ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710376354.XA CN107167577B (en) | 2017-05-25 | 2017-05-25 | Temperature control model test device |
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| CN201710376354.XA CN107167577B (en) | 2017-05-25 | 2017-05-25 | Temperature control model test device |
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| CN107167577A CN107167577A (en) | 2017-09-15 |
| CN107167577B true CN107167577B (en) | 2020-01-07 |
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| CN201710376354.XA Active CN107167577B (en) | 2017-05-25 | 2017-05-25 | Temperature control model test device |
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| CN108303065B (en) * | 2018-03-14 | 2020-04-28 | 西安建筑科技大学 | Micro-amplitude vibration rock-soil dynamic settlement experimental instrument and use method |
| CN108532648A (en) * | 2018-03-15 | 2018-09-14 | 宁波大学 | The foundation model experimental rig and test method of vacuum pre-pressed joint heating |
| CN108871907B (en) * | 2018-08-31 | 2020-10-09 | 中国石油天然气股份有限公司 | Hydraulic sand shaking device, hydraulic sand shaking system applied to sand filling model and hydraulic sand shaking method |
| CN110082178A (en) * | 2019-04-29 | 2019-08-02 | 长安大学 | A kind of earthen foundation environment in-situ condition sample curing means and method |
| CN112945727B (en) * | 2021-01-29 | 2022-09-13 | 浙江大学 | Soft soil thermal consolidation model test device and method |
| CN113848117B (en) * | 2021-09-26 | 2022-07-26 | 浙江大学 | Vertical shaft foundation hot drainage consolidation test device |
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