| Summary: | 碩士 === 國立交通大學 === 土木工程研究所 === 82 === Due to the lack of cohesion, it is difficult to obtain
undisturbed samples for sand. In-situ testing is often used to
determine the engineering properties for sands. The cone
penetration test (CPT) is a popular in-situ test method.
However, as for many other in-situ test methods, we rely on
empirical equations to interpret CPT data. A significant
part of these empirircal equations came from laboratory
chamber calibration tests. An important drawback of the
calibration chamber is its boundary effects. The main
objective of this research project is to develop a new
calibration chamber system that enables the field conditions be
simulated using the boundary element method (BEM). The
boundary elements emulate the soil beyond the physical
boundary. The lateral boundary of the new chamber is made of
multiple rings. The lateral strain at each ring level is
measured and fetched into the BEM program. The corresponding
stress at that ring level is then determined by the BEM
program. The new system includes a sand pluviator, a
hydraulic loading system and the chamber. the design of the
system and machining of major components have completed. The
thesis presents the background and current status of the
research.
|
|---|
