CN211905359U - Dynamic compaction experimental model and test system based on PIV technology - Google Patents
Dynamic compaction experimental model and test system based on PIV technology Download PDFInfo
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- CN211905359U CN211905359U CN201921876107.7U CN201921876107U CN211905359U CN 211905359 U CN211905359 U CN 211905359U CN 201921876107 U CN201921876107 U CN 201921876107U CN 211905359 U CN211905359 U CN 211905359U
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Abstract
The utility model provides a dynamic compaction experiment model and test system based on PIV technique, it includes indoor model test system, observation system and reinforcement back detecting system, indoor model test system includes braced system and experimental groove, and solid weight carries out the dynamic compaction experiment to the experimental soil of splendid attire in the experimental groove, and the data transmission to the data processing computer of stress/pore pressure sensor is given to the reading appearance, and the quiet appearance of visiting of CPT indoor model tests and transmits data to the data processing computer to experimental soil after consolidating. The utility model provides a comparatively comprehensive dynamic compaction indoor model and test system has higher using value, and realization that can be better is to the simulation of dynamic compaction construction, provides the technical reference and provides strong help for studying its reinforcement mechanism when consolidating the ground for the dynamic compaction method, can also provide the technical basis for design, construction and acceptance that the ground was consolidated to the dynamic compaction method.
Description
Technical Field
The utility model relates to a dynamic compaction ground treatment model test and test system device.
Background
In the process of gradually expanding strategic layout for promoting regional economic convergence development in China, domestic and overseas infrastructure projects often meet large-area foundation treatment projects. In the implementation of foundation treatment, dynamic compaction is one of the common treatment methods. Due to different geological conditions, the adaptability of dynamic compaction reinforcement treatment is greatly different. In addition, in the past, the dynamic compaction reinforcement adaptability is based on engineering experience to a large extent, and tests, particularly indoor model tests, are required to more accurately grasp the characteristics of the dynamic compaction reinforcement adaptability. Therefore, reliable technical support can be provided for selection of a foundation treatment scheme, prejudgment of treatment effect, design, construction and the like, and powerful technical judgment basis is further provided for foundation project landing treatment by a dynamic compaction method.
Currently, there are many scholars and industry-related practitioners who have proposed beneficial suggestions for dynamic compaction process in-house model tests. For example, the three-dimensional controllable dynamic compaction simulation centrifuge test mechanical arm device (CN104749054A), the dynamic compaction simulation test of saturated soil such as Korean and Wedeli, the sand impact load test device and the test method thereof (CN106872289A), the dynamic compaction simulation scale reduction test device (CN205483863U), the dynamic compaction reinforcement foundation indoor model device and test method of different underground water levels (CN105986582A), the novel dynamic compaction vibration model test device (CN203639955U), the dynamic compaction replacement method reinforcement foundation model test device (CN202748360U), the dynamic compaction replacement method model test device (CN101736761A) and the dynamic compaction test bench (CN 102564788A). However, there are several reasons that the dynamic compaction model test apparatus is to be further improved: firstly, under the condition that a general unit does not have similar instruments, the dynamic compaction test can not be simulated, on the other hand, the cost is higher, and the realization process is more complex; secondly, the difference is formed between the actual dynamic compaction construction and the actual dynamic compaction construction; thirdly, a half of the prototype is adopted for simulation test, and the accuracy of the test is limited; fourthly, only the test of the dynamic compaction construction equipment is involved, and the simulation test of the dynamic compaction construction is not involved; fifthly, corresponding measures are lacked for the change of the relative hole pressure, stress and strength condition in the ramming amount, settlement or reinforced soil body in the dynamic compaction test.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at overcoming the problem that exists among the above-mentioned indoor model test of dynamic compaction and the not enough of current device, provide one kind can solve foretell difficult problem betterly and can realize the simulation to the dynamic compaction construction betterly.
In order to realize the functions, the utility model provides a model and a test system for a dynamic compaction indoor model test, the system comprises an indoor model test system, an observation system and a detection system after reinforcement,
the indoor model test system comprises a support system and an experimental tank, wherein the support system comprises two supports positioned at the left side and the right side of the experimental tank, a cross beam which is erected on top beams of the two supports and can move back and forth along the top beams, a vertical guide rod arranged in the middle of the cross beam and a solid heavy hammer which vertically moves along the guide rod, the experimental tank is used for containing test soil,
the observation system comprises a digital camera which is arranged on the cross beam and can move left and right along the cross beam, a stress/pore pressure sensor which is buried in the test soil, and a reading instrument which is electrically connected with the stress/pore pressure sensor,
the reinforced detection system comprises a CPT indoor model static detector,
the reading instrument and the CPT indoor model static detector are connected to a data processing computer,
the solid heavy hammer carries out dynamic compaction experiments on the test soil contained in the experiment groove, the data of the stress/pore pressure sensor is transmitted to the data processing computer by the reading instrument, and the reinforced test soil is tested by the CPT indoor model static detector and the data is transmitted to the data processing computer.
Preferably, two sides of the guide rod are respectively provided with a positioning rod for limiting the position of the solid heavy hammer.
As a preferred mode, a water level pipe communicated with the bottom of the groove cavity is arranged outside the experiment groove.
As a preferred mode, a sealing ring is arranged at the bottom of the experiment groove.
Preferably, the cross beam is provided with scales.
The stress/pore pressure sensor consists of a group of indoor model stress sensors and a group of indoor model pore water pressure sensors.
The utility model has the advantages of it is following:
1) simple operation, low comprehensive cost and safe and reliable operation process.
2) The utility model discloses the device can be according to test model's size, adjusts and confirms from indulging, horizontal two directions, and realization that can furthest obtains the most reliable test result to the simulation of the site conditions, can consider the site conditions of complicacy to the factor of avoiding not considering influences the result deviation.
3) The utility model discloses the PIV test technique that the device adopted can obtain the condition of subsiding of the soil body without the contact soil body to obtain more accurate result of subsiding.
4) The utility model discloses the test data acquisition system that the device adopted can realize the monitoring system of different test requirements through placing observation point and sensor.
In short, the utility model provides a comparatively comprehensive interior model of dynamic compaction and test system has higher using value, and realization that can be better is to the simulation of dynamic compaction construction, provides the technical reference and provides powerful help for studying its reinforcement mechanism when consolidating the ground for the dynamic compaction, can also provide the technical basis for design, construction and acceptance that the ground was consolidated to the dynamic compaction.
Drawings
Fig. 1 is the utility model discloses a dynamic compaction experimental model and test system's elevation schematic diagram based on PIV technique.
Fig. 2 is the utility model discloses a dynamic compaction experimental model and test system's based on PIV technique bow to the schematic diagram.
Fig. 3 is a schematic flow chart of the setup of the data testing system according to the present invention.
Fig. 4 is a schematic diagram of the connection of the CPT test system of the present invention.
In the figure: 1-a guide rod; 2-positioning a rod; 3-a scaffold; 4-a cross beam; 5-experiment groove; 6-bottom plate sealing ring; 7-a water level pipe; 8-solid weight; 9-stress/pore pressure sensor; 10-a digital camera; 11-CPT indoor model static detector; 12-an encoder; 13-reading device.
Detailed Description
As shown in fig. 1 and fig. 2, the utility model discloses a dynamic compaction experimental model and test system based on PIV technique, it includes: the system comprises three major components of an indoor model test system, an observation system and a reinforced detection system.
The indoor model test system comprises a supporting system and an experimental groove, wherein the supporting system comprises a left support 3 and a right support 3 which are positioned on two sides of the experimental groove, a cross beam 4 which is erected on the top beams of the two supports 3 and can move back and forth along the top beams, a vertical guide rod 1 which is arranged in the middle of the cross beam 4, positioning rods 2 which are positioned on two sides of the guide rod 1, and a solid heavy hammer 8 which is sleeved on the guide rod and the positioning rods and moves vertically along the guide rod and the positioning rods. The guide rod 1 and the positioning rod 2 jointly provide lifting and positioning of the solid heavy hammer, scales are arranged on the guide rod and the positioning rod, and the height position of the solid heavy hammer can be accurately known. Fixed pulleys and guide ropes with scales can be used instead, so that the solid heavy hammer can be lifted and lowered, and the height of the solid heavy hammer can be measured. The beam 4 is able to move longitudinally along the support and is able to determine the relative position of movement. The experiment groove 5 is a toughened glass groove and is formed by four pieces of transparent toughened glass and sealed by glass cement, and a sealing ring is arranged at the bottom of the experiment groove, and sandy soil materials for experimental research are filled in the sealing ring. A water level pipe communicated with the bottom of the groove cavity is arranged outside the experiment groove.
The observation system comprises a digital camera 10 which is arranged on the cross beam 4 and can move left and right along the cross beam 4, a stress/pore pressure sensor 9 which is buried in the test soil, and a reading instrument 13 which is electrically connected with the stress/pore pressure sensor 9. The digital camera 10 is a high-definition digital camera which can slide and be fixed on the beam 4, and the resolution of the camera reaches or exceeds 3648 pixels multiplied by 2736 pixels. The stress/pore pressure sensor consists of a group of indoor model stress sensors and a group of indoor model pore water pressure sensors and is used for measuring the internal stress of the object to be researched and the change condition of the pore water pressure. Scales are marked on the cross beam 4, so that the transverse position of the digital camera can be accurately positioned.
The reinforced detection system comprises a CPT indoor model static detector 11, a reading instrument 13 and the CPT indoor model static detector 11, and a data processing computer is connected into the system.
The solid heavy hammer 8 carries out dynamic compaction experiments on the test soil contained in the experiment groove, the data of the stress/pore pressure sensor 9 is transmitted to the data processing computer by the reading instrument 13, and the reinforced test soil is tested by the CPT indoor model static detector 11 and the data is transmitted to the data processing computer.
Use the utility model discloses a dynamic compaction test model and test body system based on PIV technique, its concrete implementation process includes following step:
step one, receiving a test entrust, and defining a test purpose, a test requirement and test contents.
And step two, calculating dynamic compaction test parameters according to the similarity principle.
According to a similar principle, the dynamic compaction test mainly comprises the following parameters: single-click ramming energy E, rammer weight W, rammer falling distance H, hammer bottom diameter D, single-point ramming frequency N, effective reinforcing depth H and severity gammadWater content omega, as a functionThe relationship representing the above parameters is:
f(E,W,h,D,N,H,γd,ω)＝0 (1)
in the formula (1), the weight W of the rammer and the drop distance h of the rammer are taken as independent physical quantities, and the dimensional analysis is carried out on the other six physical quantities according to the pi theorem to obtain the dimensionless pi numbers:
substituting equation (2) into equation (1) becomes:
the obtained similar indexes are as follows:
based on the assumption of the targeted physical quantity, the model test assumes that the density and compression modulus parameters of the model and the prototype soil body are kept unchanged. The weight W of the rammer and the falling distance h of the rammer are used as independent physical quantities, and as long as the similarity coefficient of the falling distance h of the rammer and the similarity coefficient of the weight W of the rammer are determined, the similarity coefficients of other parameters can be determined according to the similarity relation of the formula (4).
As mentioned above, the corresponding model size, the weight and size of the solid heavy hammer, the height of the tested heavy hammer, the tamping point and the tamping times, the tamping interval time and the like are obtained.
And step three, preparing a sandy soil material to be researched, and testing the initial physical mechanical state inside the soil body by using a CPT indoor model static detector.
And step four, carrying out the test according to the test implementation parameters obtained by calculation in the step two.
And fifthly, in the test process, on one hand, adjusting the position of a camera lens to be perpendicular to the simulation test plane, sequentially shooting the soil body images at the position in the test process, and then keeping the position of the camera unchanged until the test is finished, so that the settlement conditions of the soil body under different test states are obtained through a Particle Image Velocimetry (PIV) technology. On the other hand, the data of the stress/pore pressure sensor is obtained through a high-frequency reading instrument, so that the change condition of the internal stress of the soil body and the change condition of the pore water pressure under different test states are obtained.
And step six, qualitatively evaluating the soil body reinforcement condition according to the monitoring result in the step five. And determining the detection position after reinforcement according to the qualitative evaluation result, and testing the soil body by using a CPT indoor model static detector to obtain the final physical and mechanical state of the reinforced soil body.
And seventhly, sorting the analysis result according to the monitoring result and the detection result, evaluating the condition of the soil body reinforced by the dynamic compaction, and providing a dynamic compaction construction parameter suggestion and main factors influencing the soil body dynamic compaction reinforcement.
Claims (6)
1. Dynamic compaction experimental model and test system based on PIV technique, its characterized in that includes: an indoor model test system, an observation system and a detection system after reinforcement,
the indoor model test system comprises a support system and an experimental tank, wherein the support system comprises two supports positioned at the left side and the right side of the experimental tank, a cross beam which is erected on top beams of the two supports and can move back and forth along the top beams, a vertical guide rod arranged in the middle of the cross beam and a solid heavy hammer which vertically moves along the guide rod, the experimental tank is used for containing test soil,
the observation system comprises a digital camera which is arranged on the cross beam and can move left and right along the cross beam, a stress/pore pressure sensor which is buried in the test soil, and a reading instrument which is electrically connected with the stress/pore pressure sensor,
the reinforced detection system comprises a CPT indoor model static detector,
the reading instrument and the CPT indoor model static detector are connected to a data processing computer,
the solid heavy hammer carries out dynamic compaction experiments on the test soil contained in the experiment groove, the data of the stress/pore pressure sensor is transmitted to the data processing computer by the reading instrument, and the reinforced test soil is tested by the CPT indoor model static detector and the data is transmitted to the data processing computer.
2. The PIV technology-based dynamic compaction experimental model and test system according to claim 1, wherein: and two sides of the guide rod are respectively provided with a positioning rod for limiting the position of the solid heavy hammer.
3. The PIV technology-based dynamic compaction experimental model and test system according to claim 1, wherein: a water level pipe communicated with the bottom of the groove cavity is arranged outside the experiment groove.
4. The PIV technology-based dynamic compaction experimental model and test system according to claim 1, wherein: the bottom of the experimental tank is provided with a sealing ring.
5. The PIV technology-based dynamic compaction experimental model and test system according to claim 1, wherein: scales are marked on the cross beam.
6. The PIV technology-based dynamic compaction experimental model and test system according to claim 1, wherein: the stress/pore pressure sensor consists of a group of indoor model stress sensors and a group of indoor model pore water pressure sensors.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112832226A (en) * | 2021-01-11 | 2021-05-25 | 长沙理工大学 | Method and device for determining evaluation index of effective reinforcement range |
| CN113431102A (en) * | 2021-06-23 | 2021-09-24 | 长安大学 | In-hole dynamic compaction device in physical model test and construction method thereof |
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2019
- 2019-10-31 CN CN201921876107.7U patent/CN211905359U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112832226A (en) * | 2021-01-11 | 2021-05-25 | 长沙理工大学 | Method and device for determining evaluation index of effective reinforcement range |
| CN113431102A (en) * | 2021-06-23 | 2021-09-24 | 长安大学 | In-hole dynamic compaction device in physical model test and construction method thereof |
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