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3D finite elements analysis of vertically loaded composite piled raft

Journal of Central South University 2013年第6期20卷 1713-1723页

作者： Reza Ziaie Moayed ehsan izadi Mehrad Mirsepahi Civil Engineering Department Imam Khomeini International University Department of Geotechnical Engineering Science and Research Branch Islamic Azad University

In recent years,a new type of foundation named composite piled raft foundation (also called long short composite piled raft) has been *** designing shallow foundations would mean unacceptable settlement,or other environmental risks exist which could impair the structure in the future,composite piled raft foundations could be *** element method was applied to study the behavior of this type of foundation subjected to vertical *** order to determine an optimal pile arrangement pattern which yields the minimum settlement,various pile arrangements under different vertical stress levels were *** show that with increasing the vertical stress on the raft,the effectiveness of the arrangements of short and long piles become more *** addition,a new factor named "composite piled raft efficiency" (CPRE) has been defined which determines the efficiency of long short piles arrangement in a composite piled raft *** factor will increase when short piles take more axial stresses and long piles take less axial *** addition,it is found that the changes in settlements for different long short piles arrangement are in a well agreement with changes in values of CPRE ***,CPRE ratio can be used as a factor to determine the efficiency of piles arrangements in composite piled raft foundation from the view point of reducing raft settlements.

关键词： composite piled raft settlement composite piled raft efficiency long-short pile arrangement cushion

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