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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2007, Vol. 8 Issue (11): 1746-1753    DOI: 10.1631/jzus.2007.A1746
Geotechnical & Civil Engineering     
Studies on parallel seismic testing for integrity of cemented soil columns
HUANG Da-zhi, CHEN Long-zhu
Institute of Engineering Safety and Disaster Prevention, Dept. of Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
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Abstract  The principle and process of parallel seismic (PS) testing for the integrity testing of cemented soil columns are introduced in this paper. A three-dimensional (3D) finite element model (FEM) for the pile-soil system is established for impulse responses. Under saturated soil or unsaturated soil condition, several vibrating velocity-time histories at different depths in parallel hole are obtained based on the numerical simulation. It shows that the length of the pile and the one-dimensional (1D) P-wave velocity in the pile can be determined easily from the features of the mentioned velocity-time histories. By examining the slopes of the first arrival time plotted versus depth or the depth where the amplitude of the first arrival significantly decreases, the length of the pile can be determined. The effects of the 3D P-wave propagation through the saturated soil and the defect of the cemented soil column on the velocity-time histories are also investigated.

Key words： Long branched gas pipeline network      Unsteady      Non-isothermal gas flow      CFD-simulator      Numerical simulation      Finite Volume Method      Interior Point Method     
Received: 10 February 2007     
CLC:  TU473.1  
  TU311.3  
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HUANG Da-zhi
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HUANG Da-zhi, CHEN Long-zhu. Studies on parallel seismic testing for integrity of cemented soil columns. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2007, 8(11): 1746-1753.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.2007.A1746     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2007/V8/I11/1746

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