A DESIGN FOR HORIZONTAL RESISTANCE OF PILES IN THE GROUND IMPROVED BY VACUUM CONSOLIDATION METHOD
作者单位：Chief Research Engineer Geotechnical Division Civil Engineering Research Institute of HokkaidoHiragishi 1-3-1-34Toyohira-kuSapporo 062-8602Japan DirectorGeotechnical Division Civil Engineering Research Institute of HokkaidoHiragishi 1-3-1-34Toyohira-kuSapporo062-8602Japan
会议名称：《中日岩土工程学术会议》
会议日期：2005年
学科分类：081401[工学-岩土工程] 08[工学] 0814[工学-土木工程]
关 键 词：Lateral Resistance Of Pile Vacuum Consolidation Method Load Test Seismic Design
摘 要：正 This paper presents a study of a design method for improving the ground around piles using the vacuum consolidation method, one of various ground improvement methods, and using the increased ground strength to reflect onto the horizontal resistance of piles. This is a rational design method that can reduce construction costs for site conditions with soft ground, where horizontal resistance determines pile specifications. In this design method, the range of influence of the horizontal resistance, or the range of ground improvement requiring the vacuum consolidation method, is set from 1/β(the characteristic length of piles: （?） to the range of passive earth pressure, θ=45°+（?）/2. The horizontal subgrade reaction of piles is determined by converting the shear strength C of ground, increased by consolidation, to the modulus of deformation E. The validity of the design method was empirically verified by applying it to an actual site and conducting horizontal loading tests on actual piles. The seismic behavior of the piles in the improved ground was examined using the conventional earthquake-resistant design method.