Abstract：Research purposes:Affected by the complex urban environment, sometimes the construction of urban tunnels inevitably traverse under buildings. In order to reduce the demolition of buildings,this paper studies the settlement volume of ground surface and settlement regularity of roof buildings in conditions of different construction methods by means of numerical simulation of neighborhood soft-rock shallow undercut tunnel, furthermore, it analyzes the security of buildings above the tunnel.Research conclusions:(1) Settlement of ground surface caused by construction mainly depends on geological conditions, buried depth,excavation span of tunnel and construction method which is the most obvious. (2) On the basis of simulation and monitoring results, neighborhood shallow undercut tunnel under-traversing buildings adopts CD construction method as well as advanced small pipe to grout reinforcement of surrounding rock, the ground surface settlement can be effectively controlled,the safety of roof buildings can be protected. (3) The results of this study are mainly used in the field of city tunnel project, it can be referred by similar engineering’s design and construction.
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2014, Vol. 31 
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