System and method for measuring stiffness coefficient and viscous damping coefficient of compacted soil

A technology of viscous damping and stiffness coefficient, which is used in elastic testing, machine/structural component testing, vibration testing, etc. It can solve problems such as the relationship between difficult damping and natural frequency, and the detection process is restricted, and achieve a wide range of engineering application prospects. The effect of avoiding onerous and redundant trial volumes

Inactive Publication Date: 2021-03-23
SHANDONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the detection process is subject to the measurement of the stress and strain of the surface soil, which has certain limitations.
The current damping coefficient determination method is also difficult to accurately establish the relationship between damping and natural frequency

Method used

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  • System and method for measuring stiffness coefficient and viscous damping coefficient of compacted soil
  • System and method for measuring stiffness coefficient and viscous damping coefficient of compacted soil
  • System and method for measuring stiffness coefficient and viscous damping coefficient of compacted soil

Examples

Experimental program
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Effect test

Embodiment 1

[0035] In one or more embodiments, a system for determining the stiffness coefficient and viscous damping coefficient of compacted soil is disclosed, referring to figure 1 ,include:

[0036] Frequency-variable vibrating table 1;

[0037] A specimen fixing device 2 fixed on the vibrating table for laterally constraining and protecting the soil specimen;

[0038] A mass block 5 that is used to place on the soil specimen and act as a counterweight during testing;

[0039] Earth pressure cell for measuring the peak friction force between the test piece and the cylinder wall during the vibration test;

[0040] The signal acquisition device is used to collect the displacement, velocity and acceleration signals of the entire test piece vibration system (test piece and counterweight mass block) during the vibration process.

[0041] Specifically, the vibrating table 1 with a variable frequency ω has an amplitude b and moves in the vertical direction, and the displacement equation o...

Embodiment 2

[0049]Based on the displacement, velocity and acceleration signals of the entire test piece vibration system collected by the system in Example 1, in one or more embodiments, a determination of the stiffness coefficient and viscous damping coefficient of compacted soil is disclosed method, including the following procedures:

[0050] Based on the motion state of the compacted soil specimen in the vibration test, considering the Coulomb friction force between the soil specimen and the inner wall of the specimen fixture, a single-degree-of-freedom vibration differential equation is established;

[0051] Using equation substitution and complex exponential method to construct differential equations, obtain the expressions of displacement amplitude amplification coefficients caused by the relative motion of soil specimens, and then obtain the corresponding expressions of velocity and acceleration amplification coefficients respectively;

[0052] By adjusting the input excitation fr...

Embodiment 3

[0102] In one or more embodiments, a terminal device is disclosed, including a server, the server includes a memory, a processor, and a computer program stored on the memory and operable on the processor, and the processor executes the The program realizes the determination method of the compacted soil stiffness coefficient and viscous damping coefficient in the second embodiment. For the sake of brevity, details are not repeated here.

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PUM

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Abstract

The invention discloses a system and a method for measuring a stiffness coefficient and a viscous damping coefficient of a compacted soil body. The system comprises a vibration table with variable frequency; a test piece fixing device fixed on the vibration table and used for transversely restraining and protecting the soil body test piece; a mass block used for being arranged on a soil body testpiece during testing and playing a role in balancing weight; a soil pressure box used for measuring a friction force peak value between the test piece and the cylinder wall test piece in the vibrationtest process; and a signal acquisition device used for acquiring displacement, speed and acceleration signals of the soil body test piece and the mass block in the vibration process. Factors of friction force between the test piece and the wall of the test mold are considered, an oscillatory differential equation is established based on the factors, influence factors are considered more comprehensively, and a solving result is more accurate.

Description

technical field [0001] The invention relates to the technical field of road construction, in particular to a system and method for measuring the stiffness coefficient and viscous damping coefficient of compacted soil. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] The degree of compaction is a routine inspection index to measure the compaction quality of earthwork subgrade. Usually, after the completion of roadbed rolling, the degree of compaction is tested by sand filling method or nuclear instrument method. The disadvantage of testing the degree of compaction after rolling is that the compaction quality of each small local area cannot be known in real time during the rolling process. Carry out rework and rolling to make up for engineering defects, thus causing hidden dangers in engineering quality. [0004] Therefore, it is of great ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M7/02G01M7/04G01M5/00
CPCG01M5/005G01M5/0066G01M7/025G01M7/027G01M7/04
Inventor 刘树堂曹卫东高雪池刘鹏刘健刘时俊孙振浩赵启睿栾娟
Owner SHANDONG UNIV
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