Comparison Experimental Study on Subgrade Compaction Quality Test Methods

Abstract

The principles of the continuous test methods for compaction degree is introduced based on subgrade engineering cases. The compaction parameter CMV associated with subgrade compaction is obtained through spectrum analysis on the response of a vibratory drum during compaction operations. Comparative analysis is conducted on CMV and the in situ test index Evd, which verifies that the continuous test index CMV has a high reliability and a good correlation with Evd and can objectively and comprehensively reflect the subgrade compaction quality and provides necessary basis for the application of the continuous quality test methods for subgrade.

Experimental Modal Analysis of Subgrade Based on Impact Excitation

“…Many scholars at home and abroad have conducted a lot of research for this purpose. Intelligent compaction analyzer invented by Oklahoma University [1], compaction meter value (CMV), a key indicator of intelligent compaction technology [2][3][4], acceleration intelligent compaction value with better stability than CMV [5], compaction control value (CCV) proposed by Guang [6,7], continuous compaction control value obtained by calculating the area of the acceleration envelope proposed by Pistrol et al [8], vibration compaction value proposed by Zhan et al [9], and vibratory compaction energy value with better stability than CMV and CCV proposed by Jia et al [10], etc., are important results on intelligent compaction or continuous compaction. These researches pay more attention to the monitoring of compaction quality and less attention to the further optimization of compaction technology.…”

Real-Time Monitoring Method for Layered Compaction Quality of Loess Subgrade Based on Hydraulic Compactor Reinforcement

“…Acceleration sensors are installed on mechanical parts to collect dynamic signals, and the processed signal values are numerically linked with the monitoring indicators obtained from traditional experiments [ 22 , 23 ]. The relationship between roller acceleration and soil dynamic elastic modulus has been determined previously by many researchers [ 24 , 25 , 26 , 27 ], and a number of scholars have established the relationship between roller acceleration and compaction meter value (CMV) and compaction control value (CCV) [ 28 , 29 , 30 , 31 ]. Other works have also utilized the ratio of fundamental component to harmonic component in acceleration signal to reflect the compactness of soil.…”