›› 2010, Vol. 31 ›› Issue (S1): 102-107.

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Experimental study of pore water pressure variation properties during CFG pile construction

ZHAO Xiu-shao1，MO Lin-li2，SUN Rui-min3，YANG Feng-ling3   

  1. 1. Engineering Research Center of Railway Environmental Vibration and Noise, Ministry of Education, East China Jiaotong University, Nanchang 330013, China; 2. School of Software School, East China Jiaotong University, Nanchang 330013, China; 3. North China Institute of Water Conservancy and Hydroelectric Power, Zhengzhou 450011, China
  • Received:2010-04-26 Online:2010-08-10 Published:2010-09-09

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Abstract:

Variation of pore water pressure is the microstructure foundation of saturated clay’s macro-deformation. Taking the Yangguang Xincheng project for example, pore water pressure was monitoring during the construction of long spiral CFG pile on site; and then summarized the variation of pore water pressure. According to the law of pore water pressure changes, CFG pile construction is divided to several stages. The results show that the variation of pore water pressure conflicts with conventional point of shear liquefaction; pump and fleeing bore influence pore water pressure obviously; and then the reasons for this phenomenon are given. The maximum and minimum values of pore water pressures have has accumulation effect, which performances non-symmetry along a pile construction, but amplitude of pore pressure change assumes approximate symmetry. Based on the amplitude of pore water pressure, the sphere of CFG pile construction influence is determined; and its value is relatively consistent with the cavity expansion theory’s result.

Key words: long spiral CFG pile, saturated clay, pore water pressure, pressure stage division, fleeing bore

CLC Number: 

  • TU 413.7
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