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Research on the Physical and Mechanical Properties of CFG Pile with Collapsibility Processing

LIU Zhao1,WANG Ji-qing1,PING Sha-sha2,SONG Yong-jun1,3( 1. Highway College,Chang-An University,Xi'an 710061,China; 2. College of Science,Xi'an Jiaotong University,Xi'an 710049,China; 3. Department of Engineering & Technology,Xijing College ,Xi'an 710123,China)  
At present,the foundation design of the high speed rail mainly exits two kinds of methods: filling subgrade construction and bridge pier roadbed.The advantages and disadvantages of the two ways are analyzed.The basic physical mechanics index of the filling subgrade construction with good economic performance before and after processing is expounded,which includes density,water content,liquid limit,plastic limit,internal cohesion,the response of internal friction angle.The coefficient of collapsibility and the sedimentation changes after CFG pile settlement are analyzed.The relationship between the basic the physical and mechanical indexes,the influence factors of the collapsibility and control of settlement are illustrated,which provides the theory basis for the Late-stage research.
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