Study on Mechanical Behavior of Precast Segmental Utility Tunnel in Uniform Formation
Based on the pilot project of Banan Utility Tunnel in Chongqing,PLAXIS finite element software was used to establish the model of interaction between segmental utility tunnel and soil,and then to study the stress and deformation of the tunnel cross section and the law of interaction between tunnel and soil.The results of the research show that,at the pipe joint contact surface on the floor of segmental utility tunnel,there is prone to stress concentration,as the height of backfill soil increases,the degree of stress concentration increases.At the tunnel side wall,the intersection with the axillary angle and the central axis of the upper and lower plates,there are subject to large stress and deformation,and shall be the key area to be reinforced in the design.The lateral stress on the tunnel side wall is distributed in three sections.The own stiffness of the tunnel is one of the factors affecting the settlement distribution of the surrounding soil.
segmental utility tunnelstresslaw of deformationstiffnesssettlement control
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