Vibration device for evaluating dynamic characteristics of soil body and testing method thereof

A technology of dynamic characteristics and vibration devices, which is applied in the fields of on-site foundation soil survey, construction, and infrastructure engineering, etc. It can solve problems such as the lack of integrated in-situ detection of soil dynamic characteristics, and the lateness of new static penetrating probe sensors. , to achieve the effect of easy disassembly and reliable connection

Active Publication Date: 2019-05-10
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The research on the new type of static penetration sensor started relatively late in China, an

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  • Vibration device for evaluating dynamic characteristics of soil body and testing method thereof
  • Vibration device for evaluating dynamic characteristics of soil body and testing method thereof

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Embodiment Construction

[0028] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0029] As shown in the figure, a vibrating device for evaluating the dynamic characteristics of soil according to the present invention includes: electromagnetic valve 1, cylinder 2, piston rod 3, spring 4, vibrating weight 5, and through bolt 6 and test The module is connected; the rodless chamber of the cylinder is connected with a pressure sensor 7, and a vertical geophone 8 and a horizontal geophone 9 are arranged in the vibrating weight; a side wall friction cylinder 13 is arranged in the test module of the lower part of the probe, and the internal device An acceleration sensor 10, a geophone 11, a pore water pressure sensor 12 are provided, and a pore pressure fi...

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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 vibrating device for evaluating the dynamic characteristics of soil and a testing method thereof. 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...

Claims

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Application Information

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IPC IPC(8): E02D1/00
Inventor 王蒙蔡国军刘松玉
Owner SOUTHEAST UNIV
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