Triaxial apparatus for synchronously loading high-frequency cyclic load under static load

Abstract

The invention relates to a triaxial apparatus for synchronously loading a high-frequency cyclic load under a static load. A main body structure of the triaxial apparatus comprises a triaxial apparatusbase, a pressure chamber base and a reaction frame vertical rod arranged on the triaxial apparatus base, a pressure chamber fixed to the pressure chamber base in a sealed mode, a sample placed on thepressure chamber base, a reaction frame adjustably fixed to the upper portion of the pressure chamber through the reaction frame vertical rod, and a loading rod whose upper end and the lower end arefixed to the bottom face of the reaction frame and the top face of the sample respectively. The triaxial apparatus further comprises a static force loading system, a high-frequency cyclic load loadingsystem, a confining pressure loading system, a back pressure loading system, a computer for realizing control loading and an acquisition system for realizing acceleration measurement, deformation measurement and load measurement. Compared with the prior art, the triaxial apparatus has the advantages of realizing synchronous loading of static load and high-frequency cyclic load, being wide in loadfrequency adjustment range, being capable of realizing stepless speed regulation, being stable and reliable in loading mode, being simple to operate and the like.

Description

technical field [0001] The invention relates to the field of geotechnical engineering testing equipment technology and environmental vibration engineering, in particular to a triaxial instrument for synchronous loading of high-frequency cyclic load under static load. Background technique [0002] With the rapid development of my country's regional economy, the traffic volume between regions has increased significantly, and the number of high-speed railways and expressways has shown a rapid growth trend. Research on the service performance and the dynamic response characteristics of the structure under corresponding load conditions. Based on the high-frequency vibration response characteristics of the filling soil in the high-speed railway and expressway subgrade, it is necessary to conduct some research on the subgrade soil under the vibration condition to obtain the corresponding dynamic response characteristics of the soil. [0003] The existing rock and soil dynamic prope...

AI Technical Summary

Problems solved by technology

However, there are problems such as low vibration frequency (generally lower than 20Hz), and the need for step-by-step excitation (the excitation frequency needs to be increased step by step from 0 to reach the target frequency, and there are problems such as disturbing the sample before reaching the target frequency), which is difficult Meet the experimental requirements of the above high-frequency cyclic loading conditions

[0004] At present, the mainstream driving methods of soil moving triaxial instrument include mechanical type, electromagnetic hydraulic type and pneumatic type. The first few have low vibration frequency and their output frequency is several fixed values, which consume a lot of energy (hydraulic drive needs to be equipped with corresponding cooling device) etc.

Although the vibration table loading method can meet the high-frequency cyclic load requirements, the pressure chamber vibrates together with the vibration table, which is prone to problems such as confining pressure fluctuations and stress instability

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