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Abstract A three-dimensional numerical simulation was conducted by FLAC3D software to simulate the field test. A model calibration was conducted to ensure that the numerical modeling was a realistic representation by the measured data. Finally，a sensitivity analysis was performed to investigate influence factors，such as the thickness of sand cushion，area of thrust surface and wheel pressure. The research results indicated that：(1) Under the vehicle load，when the ratio of additional stress to gravity stress was equal to 0.2 and 0.1，the corresponding depths were 1.63 and 2.03 m，respectively. (2) The maximum vertical strain occurred at the top of the mucky clay. (3) The lateral displacement increased first and then decreased along the depth and horizontal direction. (4) With the increase of thickness of sand cushion，the maximum vertical strain and the largest lateral displacement of the ground increased firstly and decreased lastly. (5) When the thickness of medium-coarse sand was about 1.25 m，the working depth was right at the bottom of medium-coarse sand. (6) The working depth，the maximum vertical strain and the maximum lateral displacement of ground increased with the increase of the area of thrust surface and wheel pressure.
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Received: 27 May 2013
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2014, Vol. 33 
