A Study on Interaction Behavior of Group-Pile Foundations

• Main Authors: ShunFan Su, 蘇順帆
• Other Authors: DerWen Chang
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/04975269782695827425

碩士 === 淡江大學 === 土木工程學系 === 89 === This study analyzes group-pile efficiency in different group-pile arranged form, using dynamic interaction factor suggested by Dobry and Gazatas (1988) with relation of stiffness between soil and foundation structure. The foundation is assumed rigid and subjected to vertically and laterally exciting forces. The normalized impedance is derived accordingly. Increasing the size and number of piles can drop the value of group-pile efficiency in static. In all the analysis, the ratio of the pile spacing and the pile diameter(s/d) is found affective to the group pile efficiency. This phenomenon is similar to the conventional observations. When operation frequency is zero, it is found that efficiency factor in the block model is higher than the other models with the vertically exciting forces, and the results are contrary to laterally exciting forces where the efficiency factors are conservative with the assumption of the block foundation. In general, the dynamic group-pile efficiency is lower or similar to the static one, therefore the static group-pile efficiency can satisfy the pile-raft design.