A test method for a vibrating device for evaluating the dynamic properties of soil

Abstract

The invention discloses a vibration device for evaluating dynamic characteristics of a soil body. The device comprises a vibration module and a test module. The vibration module comprises an electromagnetic valve, an air cylinder, a spring, and a vibration weight. The test module comprises a side wall friction cylinder, a hole pressure filter ring, and a conical probe; the probe provides nitrogenthrough a compressed nitrogen cylinder; a direct current / alternating current motor supplies power to the system; a controller controls the probe to vibrate; a pressure sensor, an acceleration sensor and a geophone feed signals back to the controller for adjustment and correction; and a computer receives and collects the signals and draws a graph in real time. In addition, the test module sensor records data such as dynamic cone tip resistance, side wall friction and pore water pressure and draws the data on the computer. An in-situ soil liquefaction and cyclic softening test can be continuously and controllably carried out in a multi-frequency manner; and the method has the characteristics of safety, convenience, rapidness, accuracy, and economy, provides a rapid and lossless detection tool for evaluating the dynamic characteristics of the soil body, and can evaluate the liquefaction potential and the softening characteristics of the soil body.

Description

technical field [0001] The invention belongs to the technical field of methods for determining the dynamic strength of soil, and in particular relates to a testing method of a vibration device for evaluating the dynamic characteristics of soil. Background technique [0002] When the soil vibrates under dynamic loads such as earthquakes, the strength and deformation characteristics of the soil are affected, and it is prone to liquefaction and cyclic softening, which poses a serious threat to the safety and stability of foundations and buildings. Vibration liquefaction is one of the primary causes of site earthquake damage. It is the loss of original strength of saturated soil under dynamic load. Due to the increase of pore water pressure and the decrease of effective stress, the change phenomenon of soil from solid to liquid is manifested as sand boiling. , slippery, circulating fluidity and other forms, causing damage to the ground structure of the site, floating or destruct...

AI Technical Summary

Problems solved by technology

The research on the new type of static penetration sensor started relatively late in China, and there is no integrated device for in-situ detection of soil dynamic characteristics in China.

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