Analysis of impact of isolation piles and shield tunnelling on adjacent high-speed railway pile foundation

In light of the adjacent high-speed railway pile foundation problem induced by the process of shield tunnelling in the saturated sandy stratum, the isolation piles, including bored pile and jet grouting pile, were applied to resist the displacement of the pile foundation. An experiment was investigated in order to determine the effect on high-speed railway piles by the adjacent construction of bored pile, jet grouting pile and shield tunnel. The monitoring in-situ was carried out. The results shows that the settlement of high-speed railway piles is induced by the performance of bored pile, the settlement value may account for almost 75%-125% of maximum ones. The heave of the high-speed railway is induced by the performance of jet grouting piles; the heave value may account for the-50% of the maximum settlement. Meanwhile, the process of the heave can last for a long time. The specific operation of shield tunnel machine affects the magnitude of the adjective high-speed railway piles subsidence; the closer the distance between the shield tunnel and the piles, the larger the influence; the cumulative settlement is associated with operation of the shield tunnelling.