CN211122294U - Model test device for researching soft clay thermal consolidation effect - Google Patents
Model test device for researching soft clay thermal consolidation effect Download PDFInfo
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- CN211122294U CN211122294U CN201921502012.9U CN201921502012U CN211122294U CN 211122294 U CN211122294 U CN 211122294U CN 201921502012 U CN201921502012 U CN 201921502012U CN 211122294 U CN211122294 U CN 211122294U
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Abstract
The utility model belongs to the technical field of geotechnical engineering and the relevant technique of ground and specifically relates to a model test device for studying soft clay thermal consolidation effect is related to. The utility model provides a model test device is easy and simple to handle, and can carry out two-sided quick drainage to can study the influence of intensification to soft clay consolidation process, thereby study soft clay's heat consolidation effect, provide new worker's method and design guidance for soft soil foundation treatment engineering design.
Description
Technical Field
The utility model belongs to the technical field of geotechnical engineering and the relevant technique of ground and specifically relates to a model test device for studying soft clay thermal consolidation effect is related to.
Background
Most of the shallow 40m soil in coastal areas of Zhejiang province and Jiangsu province in China, particularly in Zhejiang province, the shallow 40m soil in the coastal areas is silt clay which has the characteristics of large pore ratio, large water content, low strength, high sensitivity, strong structure, high compressibility, low permeability coefficient and the like and has high thixotropy. With the development of port logistics, coastal tourism and the like, engineering construction such as port construction and the like is increased, and soft soil foundations in coastal areas cannot be directly used as foundations of buildings and need foundation treatment. On the other hand, dredging sludge of channels, rivers and lakes or sludge, silt and silty clay in offshore sea areas are commonly used for blow filling of beach in coastal areas, and the blow filling of soft clay as undercounted soil also requires foundation treatment. At present, a drainage consolidation method is often adopted in foundation treatment methods of soft clay, and the method has a good effect on treatment of hydraulic filling soft clay.
The drainage consolidation method is to arrange plastic drainage plates or sand wells in the soft clay, and lay sand cushions on the surface layer to form radial and vertical drainage channels; then, consolidation pressure is applied by a method of forming negative pressure through preloading or vacuum pumping; finally, the soft clay is subjected to consolidation drainage, and the shear strength and the foundation bearing capacity are improved.
In view of the properties of high water content and the like of the hydraulic filling soft clay, the scholars in Japan think that the treatment of the hydraulic filling soft base is not limited to the treatment after the hydraulic filling soil is filled, and if some measures which are beneficial to consolidation can be adopted in the hydraulic filling process, better reinforcing effect and economic effect can be obtained. The temperature is used as a factor influencing the property of the soil body, and the apparent permeability coefficient of the soft clay can be improved after the temperature rises, so that the consolidation coefficient of the soft clay is increased, and the effect of accelerating the consolidation of the soil body is achieved. Most of the current researches on the soft clay thermal consolidation effect are based on unit tests, and few thermal consolidation effect researches on the soft clay in a model scale are carried out, so that the indoor model test device for the soft clay thermal consolidation effect researches is established, the indoor model test researches can be smoothly carried out, and the device is more reliable and accurate compared with the unit tests and has important engineering significance.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a model test device for studying soft clay heat setting effect can satisfy the indoor model test research requirement of soft clay's heat setting effect.
For this reason, the above-mentioned purpose of the present invention is achieved by the following technical solutions:
a model test device for researching the thermal consolidation effect of soft clay comprises a model groove, wherein a sand gravel drainage layer is uniformly laid at the bottom of the model groove, a drain valve is arranged on the outer side wall of the bottom of the model groove, one end of the drain valve is embedded into the sand gravel drainage layer, the upper part of the sand gravel drainage layer is laid on bottom geotextile, soft clay is laid on the bottom geotextile, a loading plate is laid on the soft clay, and a plurality of reserved holes are formed in the loading plate; the loading plate is uniformly provided with loading blocks; the model test device also comprises a heater, the heater passes through one reserved hole and penetrates into the soft clay, the upper end of the heater is connected with a steel cable, the other end of the steel cable is fixed on a steel frame, two ends of the steel frame are respectively arranged on the edge of the model groove, and the heater is connected with a temperature controller; the model test device further comprises a pore pressure sensor and a temperature sensor, the pore pressure sensor and the temperature sensor penetrate into the soft clay and are arranged on the fixed steel wire, and the other end of the fixed steel wire penetrates through a preformed hole of the loading plate and is fixed to the steel frame; and a displacement sensor is arranged between the steel frame and the loading plate, and the pore pressure sensor, the temperature sensor and the displacement sensor are respectively connected with a data acquisition unit through sensor data lines.
On the basis of adopting above technical scheme, the utility model discloses can also adopt or make up and adopt following technical scheme:
as the utility model discloses an optimal technical scheme, the top layer geotechnological cloth has been laid between soft clay and the load plate, be equipped with a plurality of wash ports on the load plate.
As the utility model discloses a preferred technical scheme, pore pressure sensor and temperature sensor set up in the fixed box of sensor, the fixed box of sensor is fixed to fixed steel wire on.
As the utility model discloses an optimized technical scheme, be equipped with a plurality of fixed steel wires on the steelframe evenly at intervals, the lower part of fixed steel wire is equipped with pore pressure sensor and temperature sensor.
As the utility model discloses an optimized technical scheme, be equipped with a plurality of pore pressure sensors and temperature sensor down from last on the single fixed steel wire in the model test device, and every pore pressure sensor and every temperature sensor form a pair ofly.
The utility model provides a model test device for studying soft clay heat setting effect has following beneficial effect: the loading plate is provided with a preformed hole for placing the heater and the sensor, after soft clay slurry is poured, the loading plate, the heater and the sensor can be placed into the soft clay together, and the sensor and the heater are placed and fixed in advance; soft clay disturbance caused by the fact that a sensor and a heater are inserted after the soft clay is solidified is avoided; the sensor and the heater can be fixed through a steel frame, and the steel frame can be fastened on the mold groove through bolts, so that the whole device is fixed into a whole, and the stability is improved; meanwhile, drain holes are uniformly distributed on the loading plate, and top geotextile is adhered to the lower surface of the loading plate, so that top drainage can be realized; the bottom of the soft clay is provided with a gravel drainage layer and bottom geotextile, so that bottom drainage can be realized; a loading block is placed on the top of the loading plate, so that the soft clay can be solidified; the displacement sensor is fixed between the loading plate and the steel frame, and can reflect the consolidation displacement of the soft clay in real time through the movement of the loading plate, so that the consolidation condition of the soft clay can be conveniently determined; the temperature controller is connected with the heater, so that the temperature of the heater can be stably controlled, surrounding soft clay is heated, the influence of the temperature on the soft clay solidification process is researched, and meanwhile, the temperature sensor and the pore pressure sensor can reflect the temperature and pore pressure response in the heating and solidification processes in real time; the utility model provides a model test device is easy and simple to handle, and can carry out two-sided quick drainage to can study the influence of intensification to soft clay consolidation process, thereby study soft clay's heat consolidation effect, provide new worker's method and design guidance for soft soil foundation treatment engineering design.
Drawings
Fig. 1 is a front perspective view of a model testing apparatus for studying thermal consolidation effect of soft clay provided by the present invention;
fig. 2 is the utility model provides a top view for studying model test device of soft clay heat setting effect.
Detailed Description
The invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 and 2, the invention provides a model test device for studying a soft clay thermal consolidation effect, which comprises a model groove 1, a steel frame 2, a gravel drainage layer 3, a drainage valve 4, a bottom geotextile 5, a soft clay 6, a top geotextile 7, a loading plate 8, a preformed hole 9 of the loading plate, a drainage hole 10, a loading block 11, a steel cable 12, a heater 13, a temperature controller 14, a fixed steel wire 15, a sensor fixing box 16, a hole pressure sensor 17, a temperature sensor 18, a displacement sensor 19, a sensor data line 20 and a data acquisition unit 21.
The die-type groove 1 is horizontally arranged in the test area, and the die-type groove 1 is a cuboid and is formed by welding steel plates; the sand gravel drainage layer 3 is uniformly laid at the bottom of the model groove 1, the side surface of the model groove 1 is provided with a drainage valve 4, and the bottom geotextile 5 is laid on the leveled sand gravel drainage layer 3 and can be used as a bottom drainage layer; during the test, the side wall of the model groove 1 is coated with silicone grease, the soft clay 6 studied in the test is fully added with water and stirred uniformly to form slurry, and then the slurry is poured into the model groove 1; drilling a hole on the loading plate 8 to obtain a preformed hole 9 and a drain hole 10; the heater 13 can just penetrate through the preformed hole 9 of the loading plate, and meanwhile, the heater 13 is connected with the steel cable 12 and can be fixed on the steel frame 2 through the preformed hole of the steel frame 2; the fixed steel wire 15 penetrates into the soil through the hole and the loading plate preformed hole 9, and the fixed steel wire 15 is uniformly provided with a sensor fixing box 16; the steel cable 12 and the fixed steel wire 15 are fixed on a preformed hole on the steel frame 2; a top geotextile 7 is adhered to the bottom of the loading plate 8, the top geotextile 9, the heater 13, the fixing steel wire 15 and the sensor fixing box 16 are placed into the mold groove 1 together, and before the loading plate 8, the heater 13 and the fixing steel wire 15 are coated with lubricating silicone grease, so that the loading plate 8 moves downwards independently, and the sensor fixing box 16 and the heater 13 keep stable and unchanged in position; the loading block 11 can complete loading of the loading plate 8, loading consolidation of the loading plate 8 on the soft clay 6 can be realized, and the loading plate 8 needs to be kept horizontal in the loading process; due to the existence of the top geotextile 7 and the drain hole 10, the top drainage of the soft clay can be realized; the heater 13 is connected with the temperature controller 14, and can control the temperature of the heater 13 to heat the soft clay; a pore pressure sensor 17 and a temperature sensor 18 are arranged in the sensor fixing box 16, and a displacement sensor 19 is fixed between the steel frame 2 and the loading plate 8, so that the temperature and pore pressure of the soft clay can be monitored in the test process, and the overall vertical displacement caused by the solidification of the soft clay can be measured; the sensor data line 20 is connected with all the pore pressure sensors 17, the temperature sensors 18 and the displacement sensors 19 and is connected to the data acquisition unit 21, so that real-time data of the sensors can be obtained; under the different temperature condition, soft clay pore pressure and time relation curve, the vertical displacement of soft clay and time relation curve can be drawn finally, can obtain the temperature to the influence that soft clay concreties, the thermal consolidation effect of aassessment soft clay, and the influence of quantization temperature to soft clay consolidation rate provides design guidance and foundation for the engineering reality.
The above detailed description is provided for explaining the present invention, and is only a preferred embodiment of the present invention, but not for limiting the present invention, and any modifications, equivalent replacements, improvements, etc. made by the present invention are within the scope of the present invention.
Claims (5)
1. A model test device for researching the thermal consolidation effect of soft clay is characterized by comprising a model groove, wherein a sand gravel drainage layer is uniformly laid at the bottom of the model groove, a drain valve is arranged on the outer side wall of the bottom of the model groove, one end of the drain valve is embedded into the sand gravel drainage layer, the upper part of the sand gravel drainage layer is laid on bottom geotextile, soft clay is laid on the bottom geotextile, a loading plate is laid on the soft clay, and a plurality of reserved holes are formed in the loading plate; the loading plate is uniformly provided with loading blocks; the model test device also comprises a heater, the heater passes through one reserved hole and penetrates into the soft clay, the upper end of the heater is connected with a steel cable, the other end of the steel cable is fixed on a steel frame, two ends of the steel frame are respectively arranged on the edge of the model groove, and the heater is connected with a temperature controller; the model test device further comprises a pore pressure sensor and a temperature sensor, the pore pressure sensor and the temperature sensor penetrate into the soft clay and are arranged on the fixed steel wire, and the other end of the fixed steel wire penetrates through a preformed hole of the loading plate and is fixed to the steel frame; and a displacement sensor is arranged between the steel frame and the loading plate, and the pore pressure sensor, the temperature sensor and the displacement sensor are respectively connected with a data acquisition unit through sensor data lines.
2. The model test device for studying the thermal consolidation effect of soft clay according to claim 1, wherein a top geotextile is laid between the soft clay and the loading plate, and the loading plate is provided with a plurality of drainage holes.
3. The model test device for studying the thermal consolidation effect of soft clay according to claim 1, wherein the pore pressure sensor and the temperature sensor are disposed in a sensor fixing box, and the sensor fixing box is fixed on the fixing steel wire.
4. The model test device for studying the thermal consolidation effect of soft clay according to claim 1, wherein a plurality of fixing steel wires are arranged on the steel frame at regular intervals, and a pore pressure sensor and a temperature sensor are arranged at the lower parts of the fixing steel wires.
5. The model test device for researching thermal consolidation effect of soft clay according to claim 1, 3 or 4, wherein a plurality of pore pressure sensors and temperature sensors are arranged on a single fixing steel wire in the model test device from top to bottom, and each pore pressure sensor and each temperature sensor form a pair.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921502012.9U CN211122294U (en) | 2019-09-11 | 2019-09-11 | Model test device for researching soft clay thermal consolidation effect |
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| CN201921502012.9U CN211122294U (en) | 2019-09-11 | 2019-09-11 | Model test device for researching soft clay thermal consolidation effect |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110595886A (en) * | 2019-09-11 | 2019-12-20 | 中国电建集团华东勘测设计研究院有限公司 | Model test device and method for researching soft clay thermal consolidation effect |
| CN112504337A (en) * | 2020-11-30 | 2021-03-16 | 同济大学 | Soft soil precipitation and recharge model test device based on optical fiber monitoring |
| CN112945727A (en) * | 2021-01-29 | 2021-06-11 | 浙江大学 | Soft soil thermal consolidation model test device and method |
-
2019
- 2019-09-11 CN CN201921502012.9U patent/CN211122294U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110595886A (en) * | 2019-09-11 | 2019-12-20 | 中国电建集团华东勘测设计研究院有限公司 | Model test device and method for researching soft clay thermal consolidation effect |
| CN110595886B (en) * | 2019-09-11 | 2021-12-28 | 中国电建集团华东勘测设计研究院有限公司 | Model test device and method for researching soft clay thermal consolidation effect |
| CN112504337A (en) * | 2020-11-30 | 2021-03-16 | 同济大学 | Soft soil precipitation and recharge model test device based on optical fiber monitoring |
| CN112504337B (en) * | 2020-11-30 | 2022-05-13 | 同济大学 | Soft soil precipitation and recharge model test device based on optical fiber monitoring |
| CN112945727A (en) * | 2021-01-29 | 2021-06-11 | 浙江大学 | Soft soil thermal consolidation model test device and method |
| CN112945727B (en) * | 2021-01-29 | 2022-09-13 | 浙江大学 | Soft soil thermal consolidation model test device and method |
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