Settlement mechanism of piled-raft foundation due to cyclic train loads and its countermeasure

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In this paper, numerical simulation with soil-water coupling finite element-finite difference(FE-FD) analysis is conducted to investigate the settlement and the excess pore water pressure(EPWP) of a piled-raft foundation due to cyclic high-speed(speed: 300km/h) train loading. To demonstrate the performance of this numerical simulation, the settlement and EPWP in the ground under the train loading within one month was calculated and confirmed by monitoring data, which shows that the change of the settlement and EPWP can be simulated well on the whole. In order to ensure the safety of train operation, countermeasure by the fracturing grouting is proposed. Two cases are analyzed, namely, grouting in No-4 softest layer and No-9 pile bearing layer respectively. It is found that fracturing grouting in the pile bearing layer(No-9 layer) has better effect on reducing the settlement. In this paper, numerical simulation with soil-water coupling finite element-finite difference (FE-FD) analysis is conducted to investigate the settlement and the excess pore water pressure (EPWP) of a piled-raft foundation due to cyclic high-speed speed loading: 300km / h) train loading. To demonstrate the performance of this numerical simulation, the settlement and EPWP in the ground under the train loading in one month was calculated and confirmed by monitoring data, which shows that the change of the settlement and EPWP can be simulated well on the whole. In order to ensure the safety of train operation, countermeasure by the fracturing grouting is proposed. Two cases are analyzed, namely, grouting in No-4 softest layer and No-9 pile bearing layer respectively. is found that fracturing grouting in the pile bearing layer (No-9 layer) has better effect on reducing the settlement.
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