Influence of extra-deep pile groups on existing neighboring tunnels

According to the influence of pile groups of high-rise buildings on nearby metro tunnels, the stress of neighboring soils and the settlement of neighboring tunnels caused by extra-deep pile groups under the work loading are analyzed. The load spreading property of pile groups under rigid cushion cup is obtained based on the improved shear displacement method as well as piles reinforced and shielding effects. Then the plain strain of profile of tunnels is calculated by combining the given load spreading property and the Mindlin answer and the formula of displacement field of soil. In this way Matlab programs are made to draw some useful conclusions by analyzing the influence factors for the settlement of tunnels including distance between them, collocation of piles, loading level and scale of piles.