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Abstract The subway excavation has great influence on underground pipeline. The pipeline would be influenced by both excavating subway-tunnel and operating subway when they are near the pipeline. Three-dimensional finite element analysis models are established to calculate the surface settlement and settlement tough. The models are established with different covering thicknesses and with the influence of an operating subway. Parameters for ensuring security of underground pipeline are obtained by surface settlement and settlement tough，and relationships between covering thickness and the parameters are discussed. Then calculation values of surface settlement，settlement trough and parameters are compared with test values. It shows that：(1) The influence of operating subway and covering thickness can not be neglected. (2) Maximum surface slope and Smax/i grow，when soil the covering thickness increases. The trend of growth becomes slow，with the increase of coveing thickness. (3) Both the maximum settlement and surface loss coefficient express a linear growth when the covering thickness rises. (4) However，the curvature of settlement trough decreases with the enhancement of covering thickness. (5) The values from calculation are similar with that from test，and the parameters from calculation are similar with that from test too.
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Received: 13 February 2012
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2013, Vol. 32 
