A Simulation of Lightweight Deflectometer Operation to Investigate Influences of Its Design on Soil Modulus of Elasticity
摘要
The lightweight deflectometer (LWD) is widely used in earthwork as a quality control/quality assurance (QC/QA) device for rapidly determining the elastic modulus of soil. It serves as a valuable tool for quality control in soil compaction, enabling modulus-based control. Discrepancies in commercial designs can result in inconsistent measurements among LWDs from various manufacturers. Additionally, some literature suggests selecting LWD components based on soil characteristics. By employing the spring-mass model with two degrees of freedom, this study investigates the behavior of the LWD with different features. Our model calculations demonstrate that plate size, buffer stiffness, and hammer mass should be chosen appropriately to ensure reliable soil modulus measurements.