DEVELOPMENT OF A BOUNDARY ELEMENT METHODA CONTROLLED CALIBRATION CHAMBER SYSTEM

• Main Authors: Hau-Ran Kuhn, 龔浩然
• Other Authors: An-Bin Huang
• Format: Others
• Language: zh-TW
• Published: 1994
• Online Access: http://ndltd.ncl.edu.tw/handle/72671116070530653374

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.