Showing papers by "Fu-Ping Gao published in 2011"

Wave-induced Pore Pressure Responses and Soil Liquefaction Around Pile Foundation

Abstract: A 3D FEM model is proposed and verified with existing experimental data for simulating wave-induced transient and residual pore pressure responses around a pile foundation. The numerical results show that the residual pore pressure tends to be amplified at the bottom of the pile foundation; near it, this pressure increases and the amplitude of transient pore pressure decreases with the decrease of soil permeability. The wave nonlinearity affects both transient and residual pore pressures around the pile. The effect of the pile diameter on the oscillatory pore pressure is much more obvious than that on the buildup of pore pressure. The liquefaction zone around the pile is asymmetric; the maximum liquefaction depth appears at the back of the pile foundation.

Soil body preparation device for imitating slope seabed

Abstract: The utility model relates to a soil body preparation device for imitating a slope seabed, which is characterized by comprising a transparent soil groove, the left and the right side walls of which are respectively and vertically provided with a support structure; each support structure is provided with a cross beam with adjustable horizontal height; an inclined beam is arranged on the two cross beams; the inclined beam is provided with a sliding track which is provided with a sliding block connected with a scraping plate; the front and the rear side walls of the soil groove are respectively provided with a horizontal bracket; one end of each horizontal bracket is provided with a fan-shaped supporting plate provided with an arc-shaped sliding groove, and the other end is provided with a support seat; the two support seats are respectively articulated with a sliding rail; the other ends of the two sliding rails are arranged in the arc-shaped sliding grooves arranged at the corresponding sides and are locked by a locking device; the two sliding rails are provided with a sand spray truck in a spanning way; the soil groove is externally provided with a motor, an output end of which is provided with a winding wheel which is fixedly connected with a stay rope; and the other end of the stay rope sequentially moves round two fixed pulleys arranged on the support structure at one side and then is used for hanging one of the sliding block and the sand spray truck.

Lateral soil resistance to an untrenched pipeline under the action of ocean currents

Abstract: A plane-strain finite element model is proposed to investigate the pipe-soil interaction mechanisms for the partially embedded pipe with two kinds of constraint conditions, i.e. freely-laid pipe and anti-rolling pipe. The numerical model is verified with updated mechanical-actuator experiments. The magnitude of lateralsoil- resistance coefficient for the examined anti-rolling pipes is much lager than that for the freely-laid pipes, indicating the end-constraint condition affects significantly the lateral stability of the untrenched pipeline in ocean currents. Parametric study indicates that the variation of lateral-soil-resistance coefficient with the dimensionless submerged weight of pipe is affected greatly by the internal friction angle of soil, pipe-soil friction coefficient, etc.