|Table of Contents|

Laboratory test of kinetic parameters of compacted soil specimen(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2022年4期
Page:
1-9
Research Field:
道路工程
Publishing date:

Info

Title:
Laboratory test of kinetic parameters of compacted soil specimen
Author(s):
LIU Shu-tang1;  XIA Jian-ping2;  GAO Xue-chi2;  YANG Guang-liang2; SUN Zhen-hao1;  CAO Wei-dong1
(1. School of Qilu Transportation, Shandong University, Jinan 250002, Shandong, China; 2. Shandong Hi-speed Group Co., Ltd., Jinan 250000, Shandong, China)
Keywords:
road engineering;  compacted soil specimen;  undamped natural frequency;  damping ratio;  stiffness coefficient
PACS:
U416.1
DOI:
10.19721/j.cnki.1671-8879.2022.04.001
Abstract:
In order to obtain the kinetic parameters such as undamped natural frequency, damping ratio and stiffness coefficient of compacted soil specimen, and to provide technical support for the quality control of compaction and the improvement of rolling process in the field construction, according to the vibration theory, the specimen was simplified as a damped single-degree-of-freedom system fixed on the surface of the shaking table by its own gravity. Firstly, based on the differential equation of motion of the specimen system caused by the foundation vibration when the displacement amplitude of the mesa was constant, the basic idea of solving the dynamic parameters of the specimen by the resonance conditions of displacement, velocity and acceleration was given. Secondly, according to the characteristics that the amplitude of the vibration table decreases with the increase of the vibration frequency, and according to the displacement resonance condition when the amplitude of the vibration table was constant, the theoretical expressions of the displacement amplitude and the effective value of the velocity of the test specimen system, under the condition that the displacement amplitude of the vibration table changes were respectively formed. In view of the deviation of the specimen in the frequency resonance region during the test, the displacement peak-peak value and the effective value of velocity of the specimen in the non-resonance region measured by the hand-held vibrometer were adopted, and the identification method of the vibration mechanics parameters of the compacted specimen was established by the least square principle. The results show that for the compacted specimen with 94% compactness the undamped natural frequency, damping ratio, stiffness coefficient and viscous damping coefficient are respectively 45.9 Hz, 0.988 1, 382 860.5 N/m and 2 625.7 N·s/m, according to the peak-peak displacement. The displacement induced by the base vibration with constant amplitude has a resonance frequency of 32.6 Hz.1 tab, 6 figs, 20 refs.

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Last Update: 2022-07-20