CN213068497U - Composite foundation rigidity loading test system for geotechnical centrifuge - Google Patents
Composite foundation rigidity loading test system for geotechnical centrifuge Download PDFInfo
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- CN213068497U CN213068497U CN202021606387.2U CN202021606387U CN213068497U CN 213068497 U CN213068497 U CN 213068497U CN 202021606387 U CN202021606387 U CN 202021606387U CN 213068497 U CN213068497 U CN 213068497U
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Abstract
The utility model provides a geotechnical centrifuge is with compound ground rigidity loading test system. The test system comprises a model box, a weighting liquid storage box, a rigid caisson, a monitoring system and a geotechnical centrifuge. The weighting liquid storage tank is fixed on the rotating arm of the centrifuge, and the rigid caisson is placed on the composite foundation. The weighting liquid storage tank can control whether the weighting liquid flows out or not and the outflow rate of the weighting liquid through an electric regulating valve. The electric regulating valve can be remotely operated by a computer, and the outflow and outflow rate of the weighted liquid are controlled under the condition that the centrifuge is not stopped. Pressure sensors are equidistantly distributed in the center of the upper surface of the bottom of the rigid caisson box, so that the pressure value, namely the load, of the weighting liquid applied to the bottom of the rigid caisson can be monitored in real time. The test system can realize multiple grading or one-time continuous, quick or slow rigid loading of the composite foundation under the condition that the centrifugal machine does not stop, the loading times and the loading rate of the composite foundation are completely controllable, the principle is simple, and the operation is convenient.
Description
Technical Field
The utility model relates to a mode is applyed to geotechnique's centrifuge model test load, in particular to geotechnique's centrifuge is with compound ground rigidity loading test system.
Background
The composite foundation is a common foundation treatment method, and can greatly improve the bearing capacity of the natural foundation and effectively reduce the settlement deformation of the natural foundation by technical means of soil body reinforcement, soft layer replacement or reinforcement material arrangement and the like, so that the composite foundation is widely applied to the engineering field.
At present, in the field of composite foundation bearing capacity test, the most intuitive and reliable method belongs to an in-situ static load test. The method is often difficult or inconvenient to develop due to the reasons of long period, huge cost, many site restriction conditions and the like. The geotechnical centrifugal model test is to place the model with a 1/N scale in a specially-made centrifuge basket and carry out a scale-reducing model test under the condition of Ng centrifugal acceleration. Compared with a field test, the geotechnical centrifugal model test can effectively overcome the defects and is widely applied to the test research of the bearing capacity of the composite foundation.
Due to the special test environment of the centrifuge, a tester cannot approach a centrifuge basket to carry out loading operation on the model in the operation process of the centrifuge. In addition, in the actual engineering project, the loading modes of the composite foundation are more: the method has the advantages of single continuous loading and multiple grading loading, and has quick and slow loading.
Therefore, it is necessary to develop a loading test system capable of simulating multiple loading modes of a composite foundation during the operation of a centrifuge.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a geotechnical centrifuge is with compound ground rigidity loading test system to solve the problem that exists among the prior art.
The technical scheme who adopts for realizing the utility model aims at so, a compound ground rigidity loading test system for geotechnical centrifuge includes the mold box, aggravates liquid storage tank, rigidity caisson, monitoring system and geotechnical centrifuge.
The geotechnical centrifuge comprises a hanging basket, a centrifuge rotating shaft and a centrifuge rotating arm. The monitoring system comprises a data acquisition processor, a soil pressure sensor, a pore pressure sensor, a film pressure sensor, an LVDT displacement sensor and a pressure sensor. And the soil pressure sensor, the pore pressure sensor, the film pressure sensor, the LVDT displacement sensor and the pressure sensor are all connected with the data acquisition processor. The data acquisition processor is connected with the computer.
The model box is a rectangular box body with an open upper end. And a sand cushion layer and a composite foundation are sequentially paved in the inner cavity of the model box. A plurality of soil pressure sensors and pore pressure sensors are buried in the composite foundation. The mold box is arranged in the basket. The bottom of the model box is fixedly connected with the bottom plate of the hanging basket.
The rigid caisson is arranged on the upper surface of the composite foundation. And a film pressure sensor is laid between the composite foundation and the rigid caisson. The rigid caisson is a rectangular box body with an open upper end. And four open corners at the upper end of the rigid caisson are respectively provided with an LVDT displacement sensor. And a plurality of pressure sensors are distributed on the upper surface of the bottom of the rigid caisson box.
The weighting liquid storage box is integrally a box body with a cover. The weighting liquid storage tank is fixed on the rotating arm of the centrifuge. The outer wall of the weighting liquid storage box is provided with a conduit. One end of the conduit is communicated with the inner cavity of the weighting liquid storage tank, and the other end of the conduit extends into the inner cavity of the rigid caisson. An electric regulating valve is arranged on the pipeline of the guide pipe. The inner cavity of the weighting liquid storage box is stored with weighting liquid.
When the geotechnical centrifuge operates, the rotating arm of the centrifuge drives the hanging basket to rotate around the rotating shaft of the centrifuge at a high speed. And the opening of the electric regulating valve is remotely controlled to realize different weighted liquid flow rate target values. The pressure sensor monitors the pressure applied to the bottom of the rigid caisson by the weighting liquid in real time and feeds back the load. And the soil pressure sensor and the pore pressure sensor record the stress and pore pressure conditions of different positions in the composite foundation in a group manner. And the film pressure sensor records the load distribution condition of the composite foundation. And the LVDT displacement sensors monitor the settlement information at the four corners of the rigid caisson in the loading process, and can calculate the inclination of the rigid caisson. And the data acquisition processor acquires and stores monitoring data of the soil pressure sensor, the pore pressure sensor, the film pressure sensor, the LVDT displacement sensor and the pressure sensor and then transmits the monitoring data to the computer.
Further, the composite foundation includes a reinforcement and foundation soil.
Further, the thickness of the sand cushion layer is more than or equal to 20 mm. The sand cushion layer is filled by adopting sand materials with uniform gradation. The maximum grain size of the sand material is 2 mm.
Furthermore, the rigid caisson is made of glass fiber reinforced plastic materials.
The technical effects of the utility model are undoubted: under the condition that the centrifugal machine does not stop, the composite foundation rigid caisson can be continuously loaded for multiple times or once, and each level of load can be continuously loaded at a high speed or a low speed, so that the principle is simple and the operation is convenient.
Drawings
FIG. 1 is a schematic diagram of a test system;
FIG. 2 is a schematic diagram of the operation of the test system;
FIG. 3 is a schematic view of a mold box structure;
FIG. 4 is a top view of the mold box;
FIG. 5 is a schematic view of a weight fluid storage tank;
FIG. 6 is a schematic view of a rigid caisson configuration;
fig. 7 is a top view of a rigid caisson.
In the figure: the device comprises a model box 1, a weighting liquid storage tank 2, an electric control valve 201, a conduit 202, a weighting liquid 203, a rigid caisson 3, a monitoring system 4, a soil pressure sensor 401, a pore pressure sensor 402, a film pressure sensor 403, an LVDT displacement sensor 404, a pressure sensor 405, a composite foundation 5, foundation soil 501, a reinforcement body 502, a sand cushion layer 6, a geotechnical centrifuge 7, a hanging basket 701, a centrifuge rotating shaft 702 and a centrifuge rotating arm 703.
Detailed Description
The present invention will be further described with reference to the following examples, but it should not be construed that the scope of the present invention is limited to the following examples. Without departing from the technical idea of the present invention, various substitutions and modifications can be made according to the common technical knowledge and the conventional means in the field, and all shall be included in the scope of the present invention.
Example 1:
referring to fig. 1, the present embodiment provides a composite foundation rigid loading test system for a geotechnical centrifuge, which includes a model box 1, a weighting liquid storage tank 2, a rigid caisson 3, a monitoring system 4, and a geotechnical centrifuge 7.
The geotechnical centrifuge 7 comprises a basket 701, a centrifuge rotating shaft 702 and a centrifuge rotating arm 703. Referring to fig. 2, when the geotechnical centrifuge 7 is in operation, the centrifuge arm 703 rotates the basket 701 at a high speed around the centrifuge shaft 702, and the basket 701 is swung up to be parallel to the arm 703. The monitoring system 4 includes a data acquisition processor, a soil pressure sensor 401, an aperture pressure sensor 402, a membrane pressure sensor 403, an LVDT displacement sensor 404 and a pressure sensor 405. The soil pressure sensor 401, pore pressure sensor 402, membrane pressure sensor 403, LVDT displacement sensor 404 and pressure sensor 405 are all connected to a data acquisition processor. The data acquisition processor is connected with the computer.
Referring to fig. 3 and 4, the mold box 1 is a rectangular box body with an open upper end. And a sand cushion layer 6 and a composite foundation 5 are sequentially paved in the inner cavity of the model box 1. The composite foundation 5 includes foundation soil 501 and reinforcement 502. A soil pressure sensor 401 and a pore pressure sensor 402 are buried in the composite foundation 5. The membrane pressure sensors 403 are arranged between the rigid caisson 3 and the composite foundation 5. The mold box 1 is arranged in a gondola 701. The bottom of the model box 1 is fixedly connected with the bottom plate of the hanging basket 701. The soil pressure sensor 401 and the pore pressure sensor 402 can record the soil pressure and the pore water pressure value of the composite foundation 5 in real time, and can be used for judging that the foundation soil consolidation is completed under the action of a certain level of load according to the change condition of the soil pressure and the pore water pressure value, so that the next graded loading is started. The film pressure sensor 403 can record the load distribution of the reinforcement 502 and the foundation soil 501 of the composite foundation 5 in real time, so as to research a load distribution mechanism.
Referring to fig. 6 and 7, the rigid caisson 3 is disposed on the upper surface of the composite foundation 5. The rigid caisson 3 is a rectangular box body with an open upper end. Four open corners at the upper end of the rigid caisson 3 are respectively provided with an LVDT displacement sensor 404. Before the test begins, LVDT displacement sensors 404 may be used to monitor the settling of the four corners of the rigid caisson and calculate the inclination information of the rigid caisson to correct the horizontal placement of the rigid caisson 3. A plurality of pressure sensors 405 are arranged at equal intervals in the center of the upper surface of the bottom of the rigid caisson 3.
Referring to fig. 5, the weight liquid storage tank 2 is integrally a box body with a cover. The weighting liquid tank 2 is fixed to the centrifuge rotor arm 703. The outer wall of the weighting liquid storage tank 2 is provided with a conduit 202. One end of the conduit 202 is communicated with the inner cavity of the weighting liquid storage tank 2, and the other end of the conduit extends into the inner cavity of the rigid caisson 3 from the upper end opening of the rigid caisson 3. An electric control valve 201 is arranged on the pipeline of the conduit 202. The inner cavity of the weighting liquid storage tank 2 is stored with weighting liquid 203. The electric regulating valve 201 controls the outflow and outflow rate of the weighting liquid 203, thereby realizing the grading and application speed of the load.
When the geotechnical centrifuge 7 operates, the centrifuge rotating arm 703 drives the basket 701 to rotate at a high speed around the centrifuge rotating shaft 702. The electric regulating valve 201 controls the weighting liquid 203 to flow into the rigid caisson 3 for multiple times or once at a preset speed, so that multiple grading or one-time continuous loading is realized. The pressure sensor 405 monitors the pressure value, namely the load, of the weighting liquid applied to the bottom of the rigid caisson in real time. The soil pressure sensors 401 and the pore pressure sensors 402 record the stress and pore pressure distribution conditions of different positions in the composite foundation 5 in a group manner. The film pressure sensor 403 can record the load distribution of the reinforcement 502 and the foundation soil 501 of the composite foundation 5 in real time and determine a load distribution mechanism. The LVDT displacement sensor 404 monitors the settling information of the rigid caisson 3 during loading and can calculate the caisson inclination. The data acquisition processor acquires and stores monitoring data of the soil pressure sensor 401, the pore pressure sensor 402, the film pressure sensor 403, the LVDT displacement sensor 404 and the pressure sensor 405, and then transmits the monitoring data to the computer.
The embodiment can realize multiple grading or one-time continuous, quick or slow loading through remote control in the operation process of the centrifugal machine, and has very important application value.
Example 2:
the embodiment provides a basic geotechnical centrifuge is with compound ground rigidity loading test system, including mold box 1, aggravate liquid storage tank 2, rigidity caisson 3, monitoring system 4 and geotechnical centrifuge 7.
The geotechnical centrifuge 7 comprises a basket 701, a centrifuge rotating shaft 702 and a centrifuge rotating arm 703. The monitoring system 4 includes a data acquisition processor, a soil pressure sensor 401, an aperture pressure sensor 402, a membrane pressure sensor 403, an LVDT displacement sensor 404 and a pressure sensor 405. The soil pressure sensor 401, pore pressure sensor 402, membrane pressure sensor 403, LVDT displacement sensor 404 and pressure sensor 405 are all connected to a data acquisition processor. The data acquisition processor is connected with the computer.
The model box 1 is a rectangular box body with an open upper end. And a sand cushion layer 6 and a composite foundation 5 are sequentially paved in the inner cavity of the model box 1. A plurality of soil pressure sensors 401 and pore pressure sensors 402 are buried in the composite foundation 5. The mold box 1 is arranged in a gondola 701. The bottom of the model box 1 is fixedly connected with the bottom plate of the hanging basket 701.
The rigid caisson 3 is arranged on the upper surface of the composite foundation 5. A film pressure sensor 403 is laid between the composite foundation 5 and the rigid caisson 3. The rigid caisson 3 is a rectangular box body with an open upper end. Four open corners at the upper end of the rigid caisson 3 are respectively provided with an LVDT displacement sensor 404. A plurality of pressure sensors 405 are equidistantly distributed on the center of the upper surface of the bottom of the rigid caisson 3.
The weighting liquid storage box 2 is integrally a box body with a cover. The weighting liquid tank 2 is fixed to the centrifuge rotor arm 703. The outer wall of the weighting liquid storage tank 2 is provided with a conduit 202. One end of the conduit 202 is communicated with the inner cavity of the weighting liquid storage tank 2, and the other end extends into the inner cavity of the rigid caisson 3. An electric control valve 201 is arranged on the pipeline of the conduit 202. The inner cavity of the weighting liquid storage tank 2 is stored with weighting liquid 203. The weighting liquid 203 is a liquid with a specific density which is prepared according to the load size required by the test.
When the geotechnical centrifuge 7 operates, the centrifuge rotating arm 703 drives the basket 701 to rotate at a high speed around the centrifuge rotating shaft 702. The opening of the electric control valve 201 is remotely controlled to achieve different target values of the flow rate of the weighting liquid. The pressure sensor 405 monitors the pressure applied by the weighting liquid 203 to the bottom of the rigid caisson 3 in real time and feeds back the load. The soil pressure sensor 401 and the pore pressure sensor 402 record the stress and pore pressure conditions of different positions in the composite foundation 5 in a group manner. The film pressure sensor 403 records the load distribution of the composite foundation 5. The LVDT displacement sensors 404 monitor the sedimentation information at the four corners of the rigid caisson 3 during the loading process, and the inclination of the rigid caisson can be calculated. The data acquisition processor acquires and stores monitoring data of the soil pressure sensor 401, the pore pressure sensor 402, the film pressure sensor 403, the LVDT displacement sensor 404 and the pressure sensor 405, and then transmits the monitoring data to the computer.
The embodiment can control the outflow and outflow rate of the weighted liquid under the condition that the centrifuge does not stop through remotely operating the electric regulating valve. Pressure sensors are equidistantly distributed in the center of the rigid caisson, so that the pressure value of the weighting liquid applied to the bottom of the rigid caisson, namely the load can be monitored in real time. Four corners of the top of the rigid caisson are provided with four LVDT displacement sensors for monitoring the settlement and the inclination of the rigid caisson in the test process. The soil pressure sensors and pore pressure sensors distributed in the composite foundation can monitor the soil pressure and pore water pressure (pore pressure for short) in the foundation soil. The film pressure sensors arranged in the covering area at the bottom of the caisson and on the surface of the composite foundation can measure the load distribution condition of the reinforcement and the foundation soil in real time and determine a load distribution mechanism. The utility model discloses under the condition that centrifuge does not shut down, can realize that composite foundation is hierarchical many times or once continuous, quick or the rigidity loading of slow speed, its loading number of times and loading rate are controllable completely, and the principle is simple, convenient operation.
Example 3:
the main structure of this embodiment is the same as that of embodiment 2, wherein the composite foundation 5 includes foundation soil 501 and reinforcement 502. The film pressure sensor 403 records the load distribution of the reinforcement 502 and the foundation soil 501 of the composite foundation 5.
In actual production, the embodiment is suitable for various composite foundations, such as soil and lime soil compaction piles, compacted sand piles, cement fly ash gravel piles, rammed cement soil piles, microorganism reinforced soil bodies, reinforced materials, soil body replacement and other composite foundations. The preparation of different types of composite foundation samples is completed according to the standard method and requirements of the corresponding composite foundation. The layout of different types of composite foundation sensors is also different.
The reinforcement 502 is a composite foundation similar to a "pile," such as a compacted sand pile, a cement fly ash gravel pile, or the like. The membrane pressure sensors 403 should be laid on the surface of the composite foundation, "pile body" and foundation soil. The soil pressure sensor 401 and the pore pressure sensor 402 are arranged in the foundation soil 501 between the reinforcement members 502 at a certain distance and depth.
The reinforcement 502 and the foundation soil 501 are relatively uniform composite foundations, such as reinforced materials, soil replacement and the like. The film pressure sensor 403 is arranged on the surface of the composite foundation and on the same body. The soil pressure sensor 401 and the pore pressure sensor 402 may be uniformly arranged within a uniform body.
Example 4:
the main structure of this embodiment is the same as that of embodiment 2, wherein when the geotechnical centrifuge 7 operates, the centrifuge boom 703 drives the basket 701 to rotate around the centrifuge shaft 702 at high speed, and the basket 701 is swung up to be parallel to the boom. The opening of the electric control valve 201 is remotely controlled to achieve different target values of the flow rate of the weighting liquid. Electric control valve 201 can control whether weighting liquid 203 flows out or not and the flow rate of weighting liquid when geotechnical centrifuge 7 is running. The weighting liquid 203 flows into the rigid caisson 3 at different rates, so that loading at different rates can be realized, and the fast and slow loading of the composite foundation can be simulated. And multiple or one-time loading is realized by controlling the outflow times of the weighting liquid 203, and multiple grading or one-time continuous loading of the composite foundation is simulated. The pressure sensor 405 monitors the pressure applied by the weighting liquid 203 to the bottom of the rigid caisson 3 in real time and feeds back the load. The soil pressure sensor 401 and the pore pressure sensor 402 record the stress and pore pressure conditions of different positions in the composite foundation 5 in a group manner. The film pressure sensor 403 records the load distribution of the composite foundation 5. The LVDT displacement sensors 404 monitor the sedimentation information at the four corners of the rigid caisson 3 during the loading process, and the inclination of the rigid caisson can be calculated. The data acquisition processor acquires and stores monitoring data of the soil pressure sensor 401, the pore pressure sensor 402, the film pressure sensor 403, the LVDT displacement sensor 404 and the pressure sensor 405, and then transmits the monitoring data to the computer.
Example 5:
the main structure of the embodiment is the same as that of the embodiment 2, wherein the thickness of the sand cushion layer 6 is more than or equal to 20 mm. The sand cushion layer 6 is filled by sand materials with uniform gradation. The maximum grain size of the sand material is 2 mm.
Example 6:
the main structure of this embodiment is the same as that of embodiment 2, wherein the rigid caisson 3 is made of glass fiber reinforced plastic.
Claims (4)
1. The utility model provides a geotechnique is compound ground rigidity loading test system for centrifuge which characterized in that: comprises a model box (1), a heavy weight liquid storage box (2), a rigid caisson (3), a monitoring system (4) and a geotechnical centrifuge (7);
the geotechnical centrifuge (7) comprises a hanging basket (701), a centrifuge rotating shaft (702) and a centrifuge rotating arm (703); the monitoring system (4) comprises a data acquisition processor, a soil pressure sensor (401), an pore pressure sensor (402), a film pressure sensor (403), an LVDT displacement sensor (404) and a pressure sensor (405); the soil pressure sensor (401), the pore pressure sensor (402), the film pressure sensor (403), the LVDT displacement sensor (404) and the pressure sensor (405) are all connected with the data acquisition processor; the data acquisition processor is connected with the computer;
the model box (1) is a rectangular box body with an open upper end; a sand cushion layer (6) and a composite foundation (5) are sequentially paved in the inner cavity of the model box (1); a plurality of soil pressure sensors (401) and pore pressure sensors (402) are buried in the composite foundation (5); the mould box (1) is arranged in a cradle (701); the bottom of the model box (1) is fixedly connected with the bottom plate of the hanging basket (701);
the rigid caisson (3) is arranged on the upper surface of the composite foundation (5); a film pressure sensor (403) is laid between the composite foundation (5) and the rigid caisson (3); the rigid caisson (3) is a rectangular box body with an open upper end; four open corners at the upper end of the rigid caisson (3) are respectively provided with an LVDT displacement sensor (404); the upper surface of the bottom of the rigid caisson (3) is provided with a plurality of pressure sensors (405);
the weighting liquid storage box (2) is integrally a box body with a cover; the weighting liquid storage tank (2) is fixed on a rotating arm (703) of the centrifuge; a guide pipe (202) is arranged on the outer wall of the weighting liquid storage tank (2); one end of the conduit (202) is communicated with the inner cavity of the weighting liquid storage tank (2), and the other end of the conduit extends into the inner cavity of the rigid caisson (3); an electric regulating valve (201) is arranged on the pipeline of the conduit (202); the inner cavity of the weighting liquid storage tank (2) is stored with weighting liquid (203).
2. The composite foundation rigid loading test system for the geotechnical centrifuge as claimed in claim 1, wherein: the composite foundation (5) comprises a reinforcement (502) and foundation soil (501).
3. The composite foundation rigid loading test system for the geotechnical centrifuge as claimed in claim 1, wherein: the thickness of the sand cushion layer (6) is more than or equal to 20 mm; the sand cushion layer (6) is filled by adopting sand materials with uniform gradation; the maximum grain size of the sand material is 2 mm.
4. The composite foundation rigid loading test system for the geotechnical centrifuge as claimed in claim 1, wherein: the rigid caisson (3) is made of glass fiber reinforced plastic materials.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111965037A (en) * | 2020-08-05 | 2020-11-20 | 重庆大学 | Composite foundation rigidity loading test system and loading test method for geotechnical centrifuge |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111965037A (en) * | 2020-08-05 | 2020-11-20 | 重庆大学 | Composite foundation rigidity loading test system and loading test method for geotechnical centrifuge |
| CN111965037B (en) * | 2020-08-05 | 2024-08-09 | 重庆大学 | Composite foundation rigidity loading test system and loading test method for geotechnical centrifuge |
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