CN117188537A - Pile penetration soil body test device and method - Google Patents
Pile penetration soil body test device and method Download PDFInfo
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- CN117188537A CN117188537A CN202311185400.XA CN202311185400A CN117188537A CN 117188537 A CN117188537 A CN 117188537A CN 202311185400 A CN202311185400 A CN 202311185400A CN 117188537 A CN117188537 A CN 117188537A
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- 230000007246 mechanism Effects 0.000 claims description 17
- 239000011148 porous material Substances 0.000 claims description 14
- 230000000149 penetrating effect Effects 0.000 claims description 13
- 238000007789 sealing Methods 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 3
- 239000012780 transparent material Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 3
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a pile penetration soil body test device and a pile penetration soil body test method.A swelling device and a rubber layer are sequentially arranged on the inner wall of a container, soil bodies are placed in the inner side of the rubber layer, all sensors required are buried in different positions and different depths in the soil body, and meanwhile, the sensors are connected with an external acquisition machine through a circuit; then injecting water into the soil body, and inflating the air bag to form a specific soil body state; and then the loading piles are inserted into the soil body, and the change data and the change state of the soil body are observed and collected. The pile penetration soil body test device and the pile penetration soil body test method can accurately record the confining pressure of soil layers with different depths to recorded piles, so that the soil body change in the pile penetration process is more accurately simulated, the comprehensiveness and the accuracy of test detection are improved, and the pile penetration construction is better guided.
Description
Technical Field
The invention relates to pile foundation engineering test equipment, in particular to a test device for detecting the change of a soil body in the pile penetration process and a method for using the test device.
Background
During the insertion of the pile into the earth, the soil mass surrounding the pile may be structurally damaged or displaced or subjected to excess pore water pressure. When a large number of piles are needed to be jointly subjected to pile group construction, interaction exists between adjacent pile bodies, so that a soil body structure between the pile bodies generates a superposition effect, and the change of soil bodies is further aggravated. In order to ensure the safety of pile construction and buildings, the method has very important functions of knowing the deformation of the soil body in the pile body penetrating stage, the changes of the super pore water pressure response and the like, and the consolidation process after the penetrating is finished.
In order to better analyze the change of pile penetration into the soil, test devices are used for researching the change of the soil. However, the existing test device ignores the change of the confining pressure of the soil body, so that the different confining pressures of the soil body on the pile wall due to the action stress among soil layer particles with different depths cannot be detected, and therefore deviation occurs in an analysis result, the accuracy of the test is influenced, and the guiding significance of the test on the construction of the tubular pile is also influenced.
Disclosure of Invention
The invention aims to provide a test device capable of more accurately and comprehensively detecting the change of soil body in the pile penetration process and a method for using the test device so as to improve the accuracy of pile penetration soil body detection and better guide pile penetration construction.
The pile penetration soil body test device of the invention comprises
The container is used for containing soil, and a drain hole for draining water is formed in the bottom of the container;
the expansion device can expand or contract and is arranged along the inner wall of the container;
the rubber layer is arranged between the swelling device and the soil body and transmits the pressure generated when the swelling device swells to the soil body;
the sensors are used for collecting data of soil, and a plurality of sensors are respectively arranged at a plurality of positions of the soil along the vertical interval;
the acquisition machine is connected with all the sensors through a line and records the data of each sensor;
loading piles, which are arranged above the containers and simulate engineering piles used in pile penetrating construction;
the driving mechanism is connected with the loading pile and drives the loading pile to penetrate into the soil body.
Further, the container comprises a container seat and a baffle, the container seat is semicircular, the baffle is flat and is connected with the semicircular end part, and the swelling device and the rubber layer are sequentially arranged on the inner wall of the container seat; and the baffle is made of transparent materials.
Further, an image shooting device is arranged on the outer side of the baffle plate.
Further, a sealing cover is arranged at the top of the baffle, and a wire hole for a line to pass through and a pile hole for a loading pile to pass through are formed in the sealing cover.
Further, there is a supporting mechanism for placing the container, comprising a base and a cushion block, wherein the cushion block is arranged on the top surface of the base, and the container seat and the baffle are arranged on the cushion block.
Further, the driving mechanism comprises a driving seat detachably connected with the container seat, and a driver connected with the driving seat and driving the loading pile to move is arranged on the driving seat.
Further, the expanding device is a long-strip-shaped air bag, an air inlet and an air outlet are formed in the air bag, and a plurality of vertically arranged air bags are sequentially arranged on the inner wall of the container.
The pile penetration soil body test method provided by the invention comprises the following steps:
s1, uniformly loading soil into a container according to preset compactness, and arranging required sensors in the soil;
s2, injecting water into the soil body in the container, monitoring pore water pressure in the soil body through a sensor, and stopping injecting water until the pore water pressure reaches a set state;
s3, starting the swelling device to swell until the swelling device reaches a set state, stopping, and keeping the swelling device in a fixed state;
and S4, driving the loading pile to descend and penetrate into the soil body by using the driving mechanism, and collecting and recording soil body data change in the penetrating process of the loading pile by using the sensor and the collecting machine.
Further, the sensors arranged in the step S1 comprise a strain sensor, a stress sensor and a pore water pressure sensor, and the sensors are respectively arranged at different positions and different depths of the soil body.
Further, an air bag is adopted as a swelling and collapsing device, the pressure in the soil body is monitored through a sensor or the air pressure is monitored through an air pressure meter until the value of the sensor or the air pressure meter reaches a set value, and then the device is stopped;
according to the pile penetration soil body test device and method, the swelling device and the rubber layer are sequentially arranged on the inner wall of the container, soil bodies are placed into the inner side of the rubber layer, and all sensors required are buried in different positions in the soil body; then, injecting water into the soil body, starting the swelling device to swell the swelling device and applying pressure to the soil body through the rubber layer, so as to simulate a specific soil body environment; then, the driving mechanism drives the loading pile to penetrate into the soil body; along with the penetration of the loading pile, the soil body changes, the changed data are detected by the sensor and transmitted to the acquisition machine through the line, the acquisition machine can record or analyze the data, and the soil layer change in the real pipe pile process can be accurately simulated through analysis. According to the pile penetration soil body test device and method, the swelling device is used for applying pressure to the soil body, the rubber layer is used for uniformly transmitting the pressure to the soil body, and then each sensor arranged vertically is used for detecting soil body change data, so that the confining pressure of soil layers with different depths to recorded piles can be accurately recorded, the soil body change in the pile penetrating process can be more accurately simulated, the comprehensiveness and accuracy of test detection are improved, and pile penetrating construction is better guided.
Drawings
Fig. 1 and 2 are schematic structural diagrams of different sides of a pile penetration soil test device.
FIG. 3 is a schematic view of the structure of the container and its inner expander, rubber layer, soil mass.
Fig. 4 is a schematic view of the arrangement of the sensor and the harvester.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, in the embodiment of the present invention, directional indications (such as up, down, left, right, front, rear, top, bottom, inner, outer, vertical, lateral, longitudinal, counterclockwise, clockwise, circumferential, radial, axial … …) are referred to, and the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
If there is a description of "first" or "second" etc. in an embodiment of the present invention, the description of "first" or "second" etc. is used for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The invention provides a pile penetration soil body test device.
In the embodiment, the pile penetration soil body test device comprises a container 1 for containing soil body, wherein a drain hole 11 is formed in the bottom of the container 1, a rubber layer 2 arranged along the inner wall is arranged in the container 1, the soil body is placed on the inner side of the rubber layer, and an expandable or contractible swelling device 3 is arranged between the rubber layer and the inner wall of the container 1; the soil mass loading device is characterized by further comprising a sensor 4 and a loading pile 5, wherein a plurality of groups of sensors are respectively arranged at different positions of the soil mass, each group of sensors comprises a plurality of sensors which are arranged at intervals along the vertical direction, and all the sensors are connected with a collecting machine 6 arranged outside the container 1 through a circuit; the loading pile is arranged above the container 1 and is connected with a driving mechanism 7 for driving the loading pile to lift, and the driving mechanism drives the loading pile to penetrate into or leave from the soil.
The pile penetrating soil body test device is characterized in that a swelling device 3 and a rubber layer 2 are sequentially arranged on the inner wall of a container 1, soil bodies are placed on the inner side of the rubber layer 2, and all sensors 4 required are buried in different positions in the soil bodies; then, injecting water into the soil body, and starting the swelling device 3 to expand the swelling device and apply pressure to the soil body through the rubber layer so as to simulate a specific soil body environment; then, the driving mechanism 7 drives the loading pile 5 to penetrate into the soil body; along with the penetration of the loading pile 5, the soil body changes, the changed data are detected by the sensor and transmitted to the acquisition machine 6 through a line, the acquisition machine 6 can record or analyze the data, and the soil layer change in the real pipe pile process can be accurately simulated through analysis.
The pile penetrating soil body test device comprises a container base 12 and a baffle 13, wherein the container base 12 is semicircular, the baffle 13 is flat and connected with the semicircular end part, and a swelling device 3 and a rubber layer 2 are sequentially arranged on the inner wall of the container base 12; the baffle 13 is made of transparent materials, such as toughened glass, organic glass or acrylic, and the drain holes 11 are arranged at the bottom of the baffle 13 so as to facilitate the observation of soil body changes in the container 1 from the outside; meanwhile, an image shooting device, such as a high-speed camera, a video recorder and the like, is arranged on the outer side of the baffle 13 so as to more comprehensively record the soil body change process in the pile construction; also, the outer wall of the baffle 13 is provided with a steel grating 14 to improve the structural strength and support properties of the baffle. In addition, the closing cap 15 is installed at the top of baffle 13 to seal and shelter from, and the closing cap passes through sealing washer connection container 1, still is provided with the line hole that supplies the circuit to pass and supplies the stake hole that loading stake 5 passed on the closing cap, in order to make things convenient for circuit and loading stake to pass to be provided with inlet opening 16 at the top of baffle 13, and all be provided with the water valve on the pipeline of connecting inlet opening and wash port, in order to ensure convenience and the accuracy of water injection in to container 1. In addition, can be provided with the supporting mechanism who is used for placing container 1, including base 8 and cushion 9, cushion 9 can be rubber cushion or wood cushion, and the cushion sets up in the base top surface, and container seat 12 and baffle 13 set up on cushion 9, through the vibration to tubular pile in-process production buffering. The driving mechanism 7 comprises a driving seat 71 detachably connected with the container seat 12, the driving seat 71 can be conveniently connected with the container seat 12 through a bolt and nut pair or a flange, so that the influence of shaking generated in the pile penetrating process on test data is avoided, and a driver 72 connected with and driving the loading pile 5 to move is arranged on the driving seat 71, so that pile penetrating operation is performed.
The pile penetration soil test device comprises a sensor 4, a strain sensor, a stress sensor and a pore water pressure sensor, so as to detect different change data of soil, and more comprehensively analyze the soil change in the pile penetration process. The top of the cover 15 is provided with a switching disc 10, and the circuit connected with the sensor 4 is connected with an external acquisition machine through the switching disc.
The pile penetrating soil body test device can be an existing device with expansion and contraction functions, or can be an elongated air bag as shown in fig. 1 and 3, an air inlet 31 and an air outlet 32 are arranged on the air bag, the air inlet and the air outlet are connected with an air compressor through an air pipe to realize expansion or contraction, and a pressure gauge is arranged on the air pipe to detect air pressure; the cross-sectional shape of the bladder may be rectangular, circular or fan-shaped, so as to create different pressures or better fit to the arcuate inner wall of the container 1; and the inner wall of the container 1 is sequentially provided with a plurality of vertically arranged air bags so as to provide pressure for soil bodies from different directions and different depths and simulate the pressure state of the soil bodies better. The plurality of air bags can be mutually independent, and the air inlet 31 and the air outlet 32 are independently arranged to be respectively connected with the air compressor through the air delivery pipe, so that the contraction or expansion of each air bag can be independently controlled. Of course, only one or a part of the air bags may be provided with the air inlet 31 and the air outlet 32, and the air bags not provided with the air inlet 31 and the air outlet 32 may be communicated with the air bags provided with the air inlet 31 and the air outlet 32 through passages so that the air flows between the air bags. If necessary, a valve can be arranged on the channel to control the on-off of the channel.
Having described embodiments of the pile penetration testing apparatus of the present invention, embodiments of testing methods employing the pile penetration testing apparatus of the present invention are described next. The specific structure of the underwater explosive soil layer damage test system is shown in the above embodiment, and the repeated parts will not be described.
In this embodiment, the pile penetration soil test method includes the following steps:
s1, uniformly loading soil into a container 1 according to preset compactness, and arranging required sensors in the soil;
s2, injecting water into the soil in the container 1, monitoring pore water pressure in the soil through a sensor, and stopping injecting water until the pore water pressure reaches a set state;
s3, starting the swelling device 3 to swell until the swelling device reaches a set state, stopping, and keeping the swelling device 3 in a fixed state;
and S4, driving the loading pile to descend and penetrate into the soil body by using the driving mechanism, and collecting and recording soil body data change in the penetrating process of the loading pile by using the sensor and the collecting machine.
In the pile penetration soil test method, the sensors arranged in the step S1 comprise strain sensors, stress sensors and pore water pressure sensors, and the sensors are respectively arranged at different positions and different depths of the soil, so that the soil is comprehensively monitored and data are acquired; and in step 2, pore pressure readings of the soil body are detected by a pore water pressure sensor.
According to the pile penetration soil test method, the swelling device can be an existing device with swelling and shrinking functions, and the pressure in the soil body is monitored through the sensor in the swelling process until the value detected by the sensor reaches a set value, and then the swelling device stops. Or the air bag is adopted as a swelling and shrinking device, at the moment, the pressure in the soil body can be monitored through the sensor, and the air pressure can be monitored through the air pressure meter until the value of the sensor or the air pressure meter reaches a set value, and then the device is stopped; and in the process of ventilating the air bag, compressed air is slowly injected into the air bag, so that the soil body structure is prevented from being damaged due to too fast inflation. Before the start of step S4, the receptacle 12 of the receptacle 1 and the drive seat 71 of the drive mechanism 7 are fixed to each other, so that shaking is avoided.
According to the pile penetration soil test method, an image shooting device is erected outside the container 1, and soil changes in the pile penetration process are recorded. After the construction of the through pile is completed and required data is recorded, the driving mechanism is used for driving the loading pile to ascend and leave the container, and the soil in the container is taken out or other analysis and research are carried out on the soil in the container.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (10)
1. Pile penetration soil body test device, its characterized in that includes:
the container (1) is used for containing soil, and a drain hole (11) for draining water is formed in the bottom of the container (1);
a swelling and collapsing device (3) which can expand or contract and is arranged along the inner wall of the container (1);
the rubber layer (2) is arranged between the swelling device and the soil body and transmits the pressure generated when the swelling device swells to the soil body;
the sensor (4) is used for collecting data of soil, and a plurality of sensors are respectively arranged at a plurality of positions of the soil along the vertical interval;
the acquisition machine (6) is connected with all the sensors through a line and records the data of each sensor;
the loading pile (5) is arranged above the container (1) and simulates an engineering pile used in pile penetration construction;
and the driving mechanism (7) is connected with the loading pile and drives the loading pile to penetrate into the soil body.
2. The pile penetration testing apparatus of claim 1, wherein: the container (1) comprises a container seat (12) and a baffle (13), the container (1) seat is semicircular, the baffle is flat and connected with the semicircular end part, and the swelling device (3) and the rubber layer (2) are sequentially arranged at the inner wall of the container seat; and the baffle is made of transparent materials.
3. The pile penetration testing apparatus of claim 2, wherein: an image shooting device is arranged on the outer side of the baffle plate (13).
4. The pile penetration testing apparatus of claim 2, wherein: a sealing cover (15) is arranged at the top of the baffle (13), and a wire hole for a line to pass through and a pile hole for a loading pile (5) to pass through are arranged on the sealing cover.
5. The pile penetration testing apparatus of claim 2, wherein: the support mechanism for placing the container (1) comprises a base (8) and a cushion block (9), wherein the cushion block is arranged on the top surface of the base, and the container base (12) and the baffle (13) are arranged on the cushion block.
6. Pile penetration testing apparatus according to any one of claims 1-5, characterized in that: the driving mechanism (7) comprises a driving seat (71) which is detachably connected with the container seat (12), and a driver (72) which is connected with and drives the loading pile (5) to move is arranged on the driving seat.
7. Pile penetration testing apparatus according to any one of claims 1-5, characterized in that: the expanding device (3) is a strip-shaped air bag, an air inlet (31) and an air outlet (32) are arranged on the air bag, and a plurality of vertically arranged air bags are sequentially arranged on the inner wall of the container (1).
8. Pile penetration soil testing method using the pile penetration soil testing apparatus according to any one of claims 1 to 7, characterized by comprising the steps of:
s1, uniformly loading soil into a container (1) according to preset compactness, and arranging required sensors in the soil;
s2, injecting water into the soil body in the container (1), monitoring pore water pressure in the soil body through a sensor, and stopping injecting water until the pore water pressure reaches a set state;
s3, starting the swelling device to swell until the swelling device reaches a set state, stopping, and keeping the swelling device in a fixed state;
and S4, driving the loading pile to descend and penetrate into the soil body by using the driving mechanism, and collecting and recording soil body data change in the penetrating process of the loading pile by using the sensor and the collecting machine.
9. A pile penetration test method according to claim 1, wherein: the sensors arranged in the step S1 comprise strain sensors, stress sensors and pore water pressure sensors, and the sensors are respectively arranged at different positions and different depths of the soil body.
10. A pile penetration test method according to claim 8 or 9, characterised in that: the air bag is used as a swelling device, the pressure in the soil body is monitored through the sensor or the air pressure is monitored through the air pressure meter until the value of the sensor or the air pressure meter reaches a set value, and then the device is stopped.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311185400.XA CN117188537A (en) | 2023-09-14 | 2023-09-14 | Pile penetration soil body test device and method |
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| CN202311185400.XA CN117188537A (en) | 2023-09-14 | 2023-09-14 | Pile penetration soil body test device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117894236A (en) * | 2024-03-14 | 2024-04-16 | 中南大学 | Simulation device and method for excavating and unloading preset tunnel model |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117894236A (en) * | 2024-03-14 | 2024-04-16 | 中南大学 | Simulation device and method for excavating and unloading preset tunnel model |
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