Open AccessValidity of Falling Ball Tester for Measuring Dynamic Elastic Modulus of Soil Subgrade Modulus of Highway
Author(s) -
Yingqi Xue,
Luwan Wang,
Xiaokun Han,
Mengjie Wang
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/560/1/012086
Subject(s) - hammer , ball (mathematics) , subgrade , elastic modulus , measure (data warehouse) , poisson's ratio , modulus , materials science , poisson distribution , structural engineering , geotechnical engineering , engineering , composite material , mathematics , computer science , mathematical analysis , statistics , database
The deformation characteristics of geotechnical materials are very important for improving the safety of highways. To determine the reliability and detection accuracy of the falling ball tester, the paper uses standard method and falling ball tester to measure the dynamic elastic modulus of standard components, PPR. The theoretical result is obtained by measuring the dynamic elastic modulus of the one-dimensional member with the single-side reflection method. To calculate the Poisson’s ratio, the transmission method is used to measure the P wave velocity of PPR that is 3 dimensional. In the falling ball tests, two excitation hammers with a diameter of 0.05m and 0.06m are used to measure the dynamic elastic modulus of PPR. By comparing the theoretical results with the values obtained by D50 and D60, it is found that more accurate results can be obtained by D60.