Shaking table of geotechnical centrifuge and its test technology
Abstract: The use of a geotechnical centrifuge shaker for model tests is an effective method to study the dynamic characteristics of geomaterials and their structures under ground load. This advanced seismic simulation method has been widely used abroad, but it has just started in China. To this end, China Water Resources and Hydropower Research Institute plans to build a high-performance centrifuge shaker based on the existing large-scale geotechnical centrifuge. This article analyzes the main characteristics and research status of some foreign centrifuge shakers. It introduces the centrifuge shaker proposed by the China Institute of Water Resources and Hydropower Research and its main technical parameters. It also introduces related auxiliary equipment and tests required for dynamic centrifuge model tests technology.
Guan Ruici: hydraulic centrifuge for geotechnical centrifuges; model test The geotechnical centrifuge uses the method of increasing the gravity of the model by using high-speed rotation to make the model soil body have the same self-weight stress as the prototype. Can directly simulate complex geotechnical engineering problems. At present, the use of geotechnical centrifuges has been very extensive. Not only can it be used to solve conventional taxi mechanics problems, such as earth-rock dams, slopes, retaining walls, pile foundations, deep foundation pits, underground caverns, etc., but can also be simulated The characteristics of the prototype stress, the researchers used centrifuges in the fields of frozen soil mechanics, environmental soil mechanics, geotechnical seismic research and blasting engineering research. The centrifugal model test also provides a very effective means for deep people to understand the basic principles of geomechanics and verify the results of numerical analysis.
Since the 1960s, more than 200 geotechnical centrifuge simulation test machines have been built internationally. Since the 1980s, many developed countries such as the United Kingdom, Japan, the United States, and France have also constructed various centrifuge shakers to perform geotechnical seismic centrifuge model tests. The research content involves the seismic deformation of the dam and the seismic stability of the slope. Structural interaction, soil liquefaction and other aspects [1.2l. Especially in earthquake-prone countries such as Japan, more than 20 centrifuge shakers have been built, and research in this area is also very active. Due to people's concern about natural disasters and the environment, research work in this area will be more noticeable.
For seismic problems of geotechnical engineering, it is usually only possible to use numerical calculation methods for analysis, and the calculation results are greatly affected by the calculation parameters and constitutive mathematical models; on-site observations are usually expensive and due to the uncertainty and complexity of the actual earthquake ’s time and space The actual measurement data cannot be obtained and used to verify the numerical analysis results; the shaking table model test on the ground cannot be used to simulate the gravity effect of geotechnical materials, so it is mostly used for structural tests of rigid materials. The centrifuge shaker can generate controllable seismic waves at the bottom of the model under the prototype stress conditions, so that the dynamic deformation and stability characteristics of geotechnical structures caused by earthquakes can be directly obtained through various monitoring methods. Therefore, the geotechnical centrifuge shaking table is regarded as the most effective seismic simulation test method by the geotechnical community at home and abroad. By complementing and verifying with the numerical simulation analysis, it can improve the level of geotechnical seismic research and solve related geotechnical seismic problems.
China has a vast territory, and many hydropower construction projects, especially new or proposed high-dam dams in the northwest and southwest regions, are located in high-seismic areas. Once destroyed in the earthquake, it will cause huge losses to people's lives and property. Therefore, while studying the numerical analysis method of geotechnical engineering dynamics, China needs to vigorously carry out dynamic centrifugal simulation test research to shorten the gap with the world's advanced level. This paper analyzes the current domestic and international centrifuge shaker test equipment and its application, the advantages and disadvantages of various centrifuge vibration systems, and finally introduces the main after large-scale centrifuge shaker proposed by China Institute of Water Resources and Hydropower Research The technical parameters and its various technical indicators are at the leading level compared with the advanced centrifuge shakers abroad. The article also briefly introduces the auxiliary experimental equipment and test methods commonly used in dynamic centrifugal model tests.
Abstract: The use of a geotechnical centrifuge shaker for model tests is an effective method to study the dynamic characteristics of geomaterials and their structures under ground load. This advanced seismic simulation method has been widely used abroad, but it has just started in China. To this end, China Water Resources and Hydropower Research Institute plans to build a high-performance centrifuge shaker based on the existing large-scale geotechnical centrifuge. This article analyzes the main characteristics and research status of some foreign centrifuge shakers. It introduces the centrifuge shaker proposed by the China Institute of Water Resources and Hydropower Research and its main technical parameters. It also introduces related auxiliary equipment and tests required for dynamic centrifuge model tests technology.
Guan Ruici: hydraulic centrifuge for geotechnical centrifuges; model test The geotechnical centrifuge uses the method of increasing the gravity of the model by using high-speed rotation to make the model soil body have the same self-weight stress as the prototype. Can directly simulate complex geotechnical engineering problems. At present, the use of geotechnical centrifuges has been very extensive. Not only can it be used to solve conventional taxi mechanics problems, such as earth-rock dams, slopes, retaining walls, pile foundations, deep foundation pits, underground caverns, etc., but can also be simulated The characteristics of the prototype stress, the researchers used centrifuges in the fields of frozen soil mechanics, environmental soil mechanics, geotechnical seismic research and blasting engineering research. The centrifugal model test also provides a very effective means for deep people to understand the basic principles of geomechanics and verify the results of numerical analysis.
Since the 1960s, more than 200 geotechnical centrifuge simulation test machines have been built internationally. Since the 1980s, many developed countries such as the United Kingdom, Japan, the United States, and France have also constructed various centrifuge shakers to perform geotechnical seismic centrifuge model tests. The research content involves the seismic deformation of the dam and the seismic stability of the slope. Structural interaction, soil liquefaction and other aspects [1.2l. Especially in earthquake-prone countries such as Japan, more than 20 centrifuge shakers have been built, and research in this area is also very active. Due to people's concern about natural disasters and the environment, research work in this area will be more noticeable.
For seismic problems of geotechnical engineering, it is usually only possible to use numerical calculation methods for analysis, and the calculation results are greatly affected by the calculation parameters and constitutive mathematical models; on-site observations are usually expensive and due to the uncertainty and complexity of the actual earthquake ’s time and space The actual measurement data cannot be obtained and used to verify the numerical analysis results; the shaking table model test on the ground cannot be used to simulate the gravity effect of geotechnical materials, so it is mostly used for structural tests of rigid materials. The centrifuge shaker can generate controllable seismic waves at the bottom of the model under the prototype stress conditions, so that the dynamic deformation and stability characteristics of geotechnical structures caused by earthquakes can be directly obtained through various monitoring methods. Therefore, the geotechnical centrifuge shaking table is regarded as the most effective seismic simulation test method by the geotechnical community at home and abroad. By complementing and verifying with the numerical simulation analysis, it can improve the level of geotechnical seismic research and solve related geotechnical seismic problems.
China has a vast territory, and many hydropower construction projects, especially new or proposed high-dam dams in the northwest and southwest regions, are located in high-seismic areas. Once destroyed in the earthquake, it will cause huge losses to people's lives and property. Therefore, while studying the numerical analysis method of geotechnical engineering dynamics, China needs to vigorously carry out dynamic centrifugal simulation test research to shorten the gap with the world's advanced level. This paper analyzes the current domestic and international centrifuge shaker test equipment and its application, the advantages and disadvantages of various centrifuge vibration systems, and finally introduces the main after large-scale centrifuge shaker proposed by China Institute of Water Resources and Hydropower Research The technical parameters and its various technical indicators are at the leading level compared with the advanced centrifuge shakers abroad. The article also briefly introduces the auxiliary experimental equipment and test methods commonly used in dynamic centrifugal model tests.
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