CN210442210U - Ultra-soft soil large-size consolidation test device - Google Patents
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- CN210442210U CN210442210U CN201920607085.8U CN201920607085U CN210442210U CN 210442210 U CN210442210 U CN 210442210U CN 201920607085 U CN201920607085 U CN 201920607085U CN 210442210 U CN210442210 U CN 210442210U
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Abstract
The utility model discloses a super soft soil large size consolidation test device, which comprises a manual leveling lever loading device, a dowel bar guiding device, a consolidation container and a frame; the manual leveling lever loading device is arranged at the top of the rack, the dowel bar guide device is fixed in the middle of the rack, the dowel bar is vertically and slidably arranged on the dowel bar guide device, the top end of the dowel bar is connected with the manual leveling lever loading device, the bottom end of the dowel bar is connected with the pressurizing top cover of the consolidation container, the manual leveling lever loading device is responsible for applying load to the dowel bar, the load is transferred to the pressurizing top cover through the dowel bar, and the pressurizing top cover transfers the load to soil in the consolidation container; the side wall of the consolidation container and the pressurizing top cover are provided with measuring sensor systems, so that the consolidation load and the stress strain of the soil body can be accurately measured.
Description
Technical Field
The utility model belongs to the technical field of geotechnical engineering geotechnical test, concretely relates to jumbo size consolidation test device of its consolidation characteristic is studied to hydraulic fill ultra-soft soil drainage consolidation in-process.
Background
With the rapid promotion of engineering construction in coastal areas of China, a large amount of hydraulic fill ultra-soft soil is generated and needs to be treated urgently. At present, a drainage consolidation method is usually adopted for treating the foundation of the hydraulic filling ultra-soft soil, so that the consolidation characteristics of the foundation must be deeply studied. However, due to the characteristics of ultra-soft soil such as high water content, large pore ratio, low permeability, high compressibility, low shear strength and the like, all soil property indexes of ultra-soft soil are often represented by nonlinear changes in the consolidation process, and the changes are not considered in the classical consolidation theory. Therefore, to further reveal the consolidation characteristics of ultra-soft soils, a number of ultra-soft soil consolidation tests must be conducted.
However, the traditional soil engineering consolidation apparatus has a small size and a large boundary constraint, and cannot simulate the real stress state of a soil body, so that the real consolidation state of ultra-soft soil cannot be reproduced, and due to the size limitation, it is difficult to install a measurement sensor on the traditional consolidation apparatus to effectively measure the stress and strain in the consolidation process. In addition, the traditional soil engineering consolidation apparatus usually adopts a lever loading device, and the consolidation load cannot be accurately controlled due to the size characteristics of mechanical rods.
Therefore, it is urgently needed to develop a large-size consolidation test device and a large-size consolidation test method suitable for the nonlinear consolidation of the ultra-soft soil, so that the large-size characteristics of the ultra-soft soil are utilized to reduce the stress state of an ultra-soft soil prototype as much as possible, and the consolidation deformation process of the ultra-soft soil is simulated. Meanwhile, the stress and strain of the soil body are measured by utilizing the stress and strain sensors arranged on the consolidation container, and after the test is finished, a soil sample can be directly selected from the consolidation container to carry out soil property parameter analysis, so that a powerful test means is provided for deeply researching the consolidation characteristics of the ultra-soft soil.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art not enough, provide a jumbo size consolidation test device that can truly simulate super soft soil consolidation characteristic.
The utility model discloses a realize through following technical scheme:
a super soft soil large-size consolidation test device comprises a manual leveling lever loading device, a dowel bar guiding device, a consolidation container and a rack;
the manual leveling lever loading device comprises a loading lever, a loading hanging scaffold, a loading weight, a balancing device and a manual leveling device, wherein the manual leveling device adopts a turbine screw rod lifter, a machine body of the manual leveling device is fixedly arranged at the top of a machine frame, the inner end of the loading lever is rotatably arranged at the bottom end of a screw rod of the turbine screw rod lifter, the loading hanging scaffold is hinged at the outer end of the loading lever, and the top of the force transmission rod is rotatably arranged at the position, close to the inner end, of the loading lever; the balancing device consists of a balancing lever, a balancing hanging scaffold and balancing weights, wherein the inner end of the balancing lever is fixedly connected with the inner end of the loading lever, the balancing hanging scaffold is hinged at the outer end of the balancing lever, and the self weights of the loading lever, the loading hanging scaffold, the force transfer rod and the pressurizing top cover can be balanced by adjusting the balancing weights on the balancing hanging scaffold so as to control the consolidation loading force of the force transfer rod on the consolidation container through the loading weights;
the dowel bar guide device is fixed in the middle of the rack, and the dowel bar is vertically and slidably arranged on the dowel bar guide device;
the consolidation container comprises a pressurizing top cover, the pressurizing top cover is fixedly connected with the bottom end of the pressure transmission rod, a pore water pressure sensor is arranged on the side wall of the consolidation container, and a displacement sensor is arranged on the pressurizing top cover.
In the above technical solution, the number of pore water pressure sensors is plural.
In the technical scheme, the rack comprises a base, a stand column and a top plate, and is connected through high-strength screws, so that a stable platform is provided for the whole testing device.
In the above technical solution, the lever ratio of the loading lever is 1:30, that is, the ratio of the distance from the loading hanging disc end to the inner end of the loading lever to the distance from the force transmission rod end to the inner end of the loading lever is 30: 1, i.e. the ratio of the loading force of the loading platform to the load transmitted by the dowel is 1: 30.
In the above technical solution, the loading force of the loading platform is greater than the load transmitted by the dowel bar.
In the technical scheme, the dowel bar guiding device comprises a fixing frame and a linear bearing, a central hole is formed in the central position of the fixing frame, the linear bearing is tightly embedded in the central hole, and the dowel bar is vertically and slidably mounted in the linear bearing so that the dowel bar is kept vertical in the test process.
In the technical scheme, the side wall of the consolidation container is made of high-strength organic glass, so that the layered settlement of the soil sample is conveniently observed.
In the technical scheme, the diameter of the consolidation container is 50cm, and the height of the consolidation container is 50 cm.
In the technical scheme, the bottom plate of the consolidation container is provided with the drain valve, so that double-sided drainage can be realized, and the permeability coefficient of a soil body can be measured in the consolidation process.
In the technical scheme, the dowel bar is provided with the pressure sensor, so that the accurate measurement of the consolidation load can be realized, and the pressure error caused in the machining and assembling of mechanical components is avoided.
In the technical scheme, the consolidation container is placed on the needle roller row device. The roller pin row device is composed of a plurality of groups of roller shafts, a frame and a rotary connecting piece, the plurality of groups of roller shafts are arranged on the frame in parallel through the rotary connecting piece to form a rolling guide rail structure, and the consolidation container can be conveniently moved in and out.
The test method of the ultra-soft soil large-size consolidation test device is as follows:
(1) before testing, selecting a research soil sample according to requirements, uniformly stirring, preparing the soil sample with a given water content, coating a layer of vaseline on the inner surface of a consolidation container, and reducing the side frictional resistance of the container wall; treating the external pipe joint of the pore water pressure sensor by using filter cloth to prevent clogging;
(2) sequentially placing a water permeable plate and filter cloth at the bottom of the consolidation container, and filling the prepared soil sample into the consolidation container in layers; when the filling is filled to a preset elevation, installing a pore water pressure sensor at a preset marking point; repeating the above operations, and sequentially filling the lower layer soil sample and the pore water pressure sensor until the preset elevation is reached; finally, the filter cloth, the water permeable plate and the pressurizing top cover are sequentially placed on the upper part of the consolidation container;
(3) after sample loading is finished, pushing the consolidation container into the bottom of the rack, centering, rotating a hand wheel on the manual leveling device to move a lead screw downwards, further driving a dowel bar and a pressurizing top cover to move downwards until the pressurizing top cover is contacted with a water permeable plate at the top of the consolidation container, and mounting a displacement sensor at a preset position on the pressurizing top cover;
(4) the self weights of the loading lever, the loading hanging scaffold, the dowel bar and the pressurizing top cover are balanced by adjusting a balancing weight on the balancing device, and the lever is kept horizontal; then sequentially adding loading weights according to the test design, applying consolidation loads in a grading manner, and starting a consolidation test; in the process of soil body drainage consolidation, a hand wheel of the manual leveling device is continuously adjusted to keep the loading lever horizontal;
(5) after the soil sample is stably consolidated under the first-stage consolidation load, a drain valve at the bottom of the consolidation container can be opened to carry out a permeability test, and the permeability coefficient under the first-stage consolidation load is measured;
(6) and (3) after the test is finished, removing the consolidation container, measuring parameters such as strength, density, water content and the like of the soil sample according to needs, preparing a new soil sample if needed, and repeating the processes (1) to (5).
The utility model discloses an advantage and beneficial effect do:
the utility model discloses a design jumbo size consolidation test device is very big overcome the influence that the scale effect is out of shape to the consolidation of super weak soil, can restore the original stress state of the soil body, and then the consolidation deformation process of the simulation soil body that can be more true. The pressure sensor, the pore water pressure sensor and the displacement sensor which are arranged in the consolidation test device can accurately measure the consolidation load and the stress strain of the soil body, and soil property index analysis can be carried out by directly taking soil in the consolidation container after the test is finished, so that the consolidation characteristic of the ultra-soft soil can be deeply researched. Furthermore, the utility model discloses a set up dowel steel guider and can prevent that dowel steel and pressurization top cap from producing the incline, improved loaded stability, the device is arranged to the kingpin that sets up on the frame base, very big the business turn over that has made things convenient for the consolidation container has saved a large amount of manpowers. The utility model has the advantages of easy and simple to handle, strong adaptability, degree of automation are high, utilize the utility model discloses a consolidation test device carries out a large amount of consolidation tests to summarize the supersoft jumbo size consolidation test method, for exploring the nonlinear consolidation characteristic of supersoft soil and laid solid basis, and then provide scientific and technological support for the development of coastal area supersoft soil foundation treatment technique.
Drawings
FIG. 1 is a schematic structural diagram of a super-soft soil large-size consolidation test device;
FIG. 2 is a schematic representation of a consolidated vessel configuration;
FIG. 3 is a schematic view of a needle roller row;
in the figure: 1 is a manual leveling lever loading device; 2 is a dowel bar; 3 is a dowel bar guide device; 4 is a consolidation container; 5 is a roller pin row device; 6 is a measuring sensor system; 7 is a frame; 1-1 is a loading lever; 1-2 is a loading hanging scaffold; 1-3 is a loading weight; 1-4 are balancing devices; 1-5 are balancing levers; 1-6 are balancing hanging scaffold; 1-7 are balancing weights; 1-8 are manual leveling devices; 1-9 are hand wheels; 1-10 are turbine mechanisms; 1-11 are lead screws; 3-1 is a fixing frame; 3-2 is a central hole; 3-3 is a linear bearing; 4-1 is a pressurizing top cover; 4-2 is an upper cover ring; 4-3 is a side wall; 4-4 is a bottom plate; 4-5 are permeable plates; 4-6 is filter cloth; 4-8 are set screws; 4-9 is a drain valve; 5-1 is a roller; 5-2 is a frame; 5-3 is a rotary connecting piece; 6-1 is a pore water pressure sensor; 6-2 is a displacement sensor; 6-3 is a pressure sensor; 7-1 is a column; 7-2 is a top plate; 7-3 is a base.
For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.
Detailed Description
In order to make the technical field person understand the solution of the present invention better, the technical solution of the present invention is further described below with reference to the specific embodiments.
Example one
Referring to the attached drawings 1-3, the embodiment provides a super-soft soil large-size consolidation test device which comprises a manual leveling lever loading device 1, a dowel bar 2, a dowel bar guiding device 3, a consolidation container 4, a measuring sensor system 6, a frame 7 and the like.
The manual leveling lever loading device 1 is installed at the top of the rack 7, the dowel bar guide device 3 is fixed in the middle of the rack 7, the dowel bar 2 is vertically and slidably installed on the dowel bar guide device 3, the top end of the dowel bar 2 is connected with the manual leveling lever loading device 1, the bottom end of the dowel bar 2 is connected with a pressurizing top cover 4-1 of the consolidation container 4, the manual leveling lever loading device 1 is responsible for applying load to the dowel bar 2 and transmitting the load to the pressurizing top cover 4-1 through the dowel bar 2, and the pressurizing top cover 4-1 transmits the load to soil in the consolidation container 4; and a measuring sensor system 6 is arranged on the side wall 4-3 and the pressurizing top cover 4-1 of the consolidation container to measure the stress and strain of the ultra-soft soil in a consolidation process in real time.
The structure of each part is described in detail as follows:
the rack 7 comprises a base 7-3, an upright post 7-2 and a top plate 7-1, and is connected through high-strength screws to provide a stable platform for the whole test device.
The manual leveling lever loading device 1 comprises a loading lever 1-1, a loading hanging scaffold 1-2, loading weights 1-3, a balancing device 1-4 and a manual leveling device 1-8. The manual leveling device 1-8 adopts a turbine screw lifter which comprises a hand wheel 1-9, a turbine mechanism 1-10 and a screw 1-11, a machine body of the turbine screw lifter is fixedly arranged on a top plate 7-1 of the rack 7 through a bolt, a through hole for the screw 1-11 to pass through is formed in the top plate 7-1, and the screw 1-11 vertically passes through the through hole; the inner end of the loading lever 1-1 is rotatably arranged at the bottom end of the screw rod 1-11, the loading hanging scaffold 1-2 is hinged at the outer end of the loading lever 1-1, the top of the dowel bar 2 is rotatably arranged at the position, close to the inner end, of the loading lever 1-1, so that the lever ratio of the loading lever 1-1 is 1:30, namely the ratio of the distance from the end of the loading hanging scaffold 1-2 to the inner end of the loading lever 1-1 to the distance from the end of the dowel bar 2 to the inner end of the loading lever 1-1 is 30: 1, namely the ratio of the loading force of the loading hanging scaffold to the load transmitted by the dowel bar 2 is 1: 30; the manual leveling device 1-8 has the function that the rotary motion of the hand wheel 1-9 is converted into the up-and-down motion of the screw rod 1-11, so that the screw rod 1-11 drives the inner end of the loading lever 1-1 to move up and down, the leveling of the lever is realized, and the dowel bar 2 can have the up-and-down feeding function. The balancing device 1-4 consists of a balancing lever 1-5, a balancing hanging scaffold 1-6 and a balancing weight 1-7, the inner end of the balancing lever 1-5 is fixedly connected with the inner end of the loading lever 1-1, the balancing hanging scaffold 1-6 is hinged at the outer end of the balancing lever 1-5, the dead weight of the loading lever 1-1, the loading hanging scaffold 1-2, the dowel bar 2 and the pressurizing top cover 4-1 can be balanced by adjusting the balancing weights 1-7 on the balancing hanging scaffold 1-6, so as to control the consolidation loading force of the dowel bar 2 on the consolidation container through the loading weights 1-3, namely, under the balancing action of the balancing device 1-4, the consolidation loading force of the consolidation container is ensured to be only related to the gravity of the loading weight 1-3, and the ratio of the consolidation loading force to the gravity of the loading weight 1-3 is 1: 30.
The dowel bar guide device 3 is fixed on an upright post 7-2 in the middle of the rack 7, the dowel bar guide device 3 comprises a fixed frame 3-1 and a linear bearing 3-3, a central hole 3-2 is formed in the central position of the fixed frame 3-1, the linear bearing 3-3 is tightly embedded in the central hole 3-2, and the dowel bar 2 is vertically and slidably installed in the linear bearing 3-3 so that the dowel bar 2 is kept vertical in the test process.
The consolidation container 4 consists of a pressurizing top cover 4-1, an upper cover ring 4-2, a side wall 4-3, a bottom plate 4-4, a water permeable plate 4-5 and filter cloth 4-6, the diameter of the consolidation container is 50cm, the height of the consolidation container is 50cm, the influence of the scale effect of a consolidation model can be greatly reduced, and the real stress state of the ultra-soft soil can be simulated. The pressurizing top cover 4-1 is fixedly connected with the bottom end of the pressure transmission rod 2 through a fixing screw 4-8, a plurality of groups of pore water pressure sensors 6-1 are arranged on the side wall 4-3 of the consolidation container, and a displacement sensor 6-2 is arranged on the pressurizing top cover 4-1. Furthermore, the side wall 4-3 of the consolidation container is made of high-strength organic glass, so that the layered settlement of the soil sample can be observed conveniently. The bottom plate 4-4 of the consolidation container is provided with a drain valve 4-9, so that double-sided drainage can be realized, and the permeability coefficient of a soil body can be measured in the consolidation process.
Furthermore, the dowel bar 2 is provided with a pressure sensor 6-3, so that the accurate measurement of the consolidation load can be realized, and the pressure error caused in the machining and assembling of mechanical components is avoided.
Example two
Further, the consolidation container 4 is placed on a needle roller row unit 5, see fig. 3, and the needle roller row unit 5 is composed of a roller 5-1, a frame 5-2, and a rotary connector 5-3. The number of the rolling shafts 5-1 is multiple, the multiple groups of rolling shafts 5-1 are arranged on the frame 5-2 in parallel through the rotating connecting piece 5-3 to form a rolling guide rail structure, and the consolidation container 4 can be moved in and out conveniently.
EXAMPLE III
The example provides a test method based on the ultra-soft soil large-size consolidation test device, and the specific method is as follows:
(1) before testing, selecting a research soil sample according to requirements, uniformly stirring, preparing the soil sample with a given water content, and coating a layer of vaseline on the inner surface of the consolidation container 4 to further reduce the side frictional resistance of the container wall; the external pipe joint of the pore water pressure sensor 6-1 is treated by filter cloth to prevent clogging; the air in the pipeline of the pore water pressure sensor 6-1 is emptied by utilizing the water absorption of the aurilave, so that the pore pressure measurement is accurate.
(2) Sequentially placing a water permeable plate 4-5 and filter cloth 4-6 at the bottom of the consolidation container 4, and filling the prepared soil sample into the consolidation container 4 in layers; when the filling is carried out to a preset elevation, a pore water pressure sensor 6-1 is arranged at a preset marking point; repeating the above operations, and sequentially filling the lower layer soil sample and the pore water pressure sensor until the preset elevation is reached; finally, filter cloth 4-6, a water permeable plate 4-5 and a pressurizing top cover 4-1 are sequentially placed on the upper part of the consolidation container.
(3) After sample loading is finished, the consolidation container 4 is pushed into the bottom of the rack 7 through the needle roller arrangement device 5, after centering, a hand wheel 1-9 on a manual leveling device 1-8 is rotated to move a screw rod 1-11 downwards, so that a force transmission rod 2 and a pressurizing top cover 4-1 are driven to move downwards until the pressurizing top cover 4-1 is contacted with a water permeable plate 4-5 at the top of the consolidation container 4, and a displacement sensor 6-2 is arranged at a preset position on the pressurizing top cover 4-1.
(4) The self weights of the loading lever 1-1, the loading hanging scaffold 1-2, the dowel bar 2 and the pressurizing top cover 4-1 are balanced by adjusting the balancing weights 1-7 on the balancing device 1-4, and the lever is kept horizontal. And then sequentially adding 1-3 loading weights according to the test design, applying consolidation load in a grading manner, and starting a consolidation test. In the process of soil body drainage consolidation, a hand wheel 1-9 of a manual leveling device 1-8 is continuously adjusted, so that the loading lever 1-1 is kept horizontal.
(5) And after the soil sample is stably solidified under the first-stage consolidation load, opening a drain valve 4-9 at the bottom of the consolidation container 4 to perform a permeability test, and measuring the permeability coefficient under the first-stage consolidation load.
(6) After the test is finished, the consolidation container 4 is removed, and parameters such as strength, density, water content and the like of the soil sample are measured according to needs. And (5) repeating the processes (1) to (5) if a new soil sample needs to be prepared.
The invention has been described above by way of example, and it should be noted that any simple variants, modifications or other equivalent substitutions by a person skilled in the art without spending creative effort may fall within the scope of protection of the present invention without departing from the core of the present invention.
Claims (10)
1. The utility model provides a supersoft soil jumbo size consolidation test device which characterized in that: comprises a manual leveling lever loading device, a dowel bar guiding device, a consolidation container and a frame;
the manual leveling lever loading device comprises a loading lever, a loading hanging scaffold, a loading weight, a balancing device and a manual leveling device, wherein the manual leveling device adopts a turbine screw rod lifter, a machine body of the manual leveling device is fixedly arranged at the top of a machine frame, the inner end of the loading lever is rotatably arranged at the bottom end of a screw rod of the turbine screw rod lifter, the loading hanging scaffold is hinged at the outer end of the loading lever, and the top of the force transmission rod is rotatably arranged at the position, close to the inner end, of the loading lever; the balancing device consists of a balancing lever, a balancing hanging scaffold and balancing weights, wherein the inner end of the balancing lever is fixedly connected with the inner end of the loading lever, the balancing hanging scaffold is hinged at the outer end of the balancing lever, and the self weights of the loading lever, the loading hanging scaffold, the force transfer rod and the pressurizing top cover can be balanced by adjusting the balancing weights on the balancing hanging scaffold;
the dowel bar guide device is fixed in the middle of the rack, and the dowel bar is vertically and slidably arranged on the dowel bar guide device;
the consolidation container comprises a pressurizing top cover, the pressurizing top cover is fixedly connected with the bottom end of the pressure transmission rod, a pore water pressure sensor is arranged on the side wall of the consolidation container, and a displacement sensor is arranged on the pressurizing top cover.
2. The ultra-soft soil large-size consolidation test device according to claim 1, characterized in that: the pore water pressure sensor is in a plurality of numbers.
3. The ultra-soft soil large-size consolidation test device according to claim 1, characterized in that: the frame includes base, stand and roof, through high strength screwed connection.
4. The ultra-soft soil large-size consolidation test device according to claim 1, characterized in that: the lever ratio of the loading lever is 1:30, namely the ratio of the distance from the loading hanging disc end to the inner end of the loading lever to the distance from the force transmission rod end to the inner end of the loading lever is 30: 1, i.e. the ratio of the loading force of the loading platform to the load transmitted by the dowel is 1: 30.
5. The ultra-soft soil large-size consolidation test device according to claim 1, characterized in that: the loading force of the loading platform is greater than the load transmitted by the dowel.
6. The ultra-soft soil large-size consolidation test device according to claim 1, characterized in that: the dowel bar guide device comprises a fixing frame and a linear bearing, wherein a central hole is formed in the central position of the fixing frame, the linear bearing is tightly embedded in the central hole, and the dowel bar is vertically and slidably mounted in the linear bearing.
7. The ultra-soft soil large-size consolidation test device according to claim 1, characterized in that: the consolidation vessel sidewall is made of high strength organic glass.
8. The ultra-soft soil large-size consolidation test device according to claim 1, characterized in that: and a drain valve is arranged on the consolidation container bottom plate.
9. The ultra-soft soil large-size consolidation test device according to claim 1, characterized in that: the dowel bar is provided with a pressure sensor.
10. The ultra-soft soil large-size consolidation test device according to claim 1, characterized in that: the consolidation container is placed on the roller pin row device; the roller pin row device is composed of a plurality of groups of roller shafts, a frame and a rotary connecting piece, the plurality of groups of roller shafts are arranged on the frame in parallel through the rotary connecting piece to form a rolling guide rail structure, and the consolidation container can be conveniently moved in and out.
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| CN109991099A (en) * | 2019-04-29 | 2019-07-09 | 中交天津港湾工程研究院有限公司 | A kind of ultra-soft soil large scale consolidation testing device and test method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109991099A (en) * | 2019-04-29 | 2019-07-09 | 中交天津港湾工程研究院有限公司 | A kind of ultra-soft soil large scale consolidation testing device and test method |
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