Study on Settlement Controlling Effects for Foundation with Piles Thrusted － expanded in Column － hammer along High Speed Railway in Collapsible Loess Region
QU Yao － hui，WEI Yong － liang，WU Xiao － peng，MI Wei － jun
Northwest Research Institute Co． Ltd of China Railway Engineering Corporation，Lanzhou，Gansu 730000，China
Abstract：Research purposes: Settlement controlling is a key technical problem of high － speed railway construction in collapsible loess regions． The papers rely on collapsible loess subgrade test engineering along Zhengzhou － Xi＇an high speed railway，by carrying on settlement observations，large water immersion test and foundation settlement forecast， research on settlement characteristics，effects of collapsibility elimination and settlement controlling of foundation with piles thrusted － expanded in column － hammer under high － speed railway technology conditions． It can provide technical reserves in collapsible loess regions along high speed railway．
Research conclusions: The maximum treatment depth of piles thrusted － expanded in column － hammer is 20 － 30 m． The result show that，dealed with 22 m piles thrusted － expanded in column － hammer，the roadbed rarely occures settment and the collapsibility of reinforced layer also eliminates． The roadbed don' t need to preload． Thus，piles thrusted － expanded in column － hammer can obtain the expected results in settlement controlling in large thickness collapsible loess site．
屈耀辉,魏永梁 武小鹏 米维军. 黄土区高铁柱锤冲扩桩地基沉降控制效果研究[J]. 铁道工程学报, 2012, 29(1): 21-25.
QU Yao － hui，WEI Yong － liang，WU Xiao － peng，MI Wei － jun. Study on Settlement Controlling Effects for Foundation with Piles Thrusted － expanded in Column － hammer along High Speed Railway in Collapsible Loess Region. 铁道工程学报, 2012, 29(1): 21-25.
Northwest Research Institute Co． Ltd of CREC． Loess Research and Practice of Railway Engineering ［M］． Lanzhou: Northwest Research Institute Co． Ltd，2005．
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2012, Vol. 29 
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