Assessing the Effects of Shallow-Buried Rectangular Pipe Jacking on Nearby Pipelines and Ground Surface Stability
Ground-surface deformation characteristics caused by jacked rectangular pipes differ from those caused by jacked circular pipes or shield tunnels.The ground-settlement characteristics during the construction of a shallow-buried rectangular jacked pipe and its impact on the existing shield tunnel below the jacked pipe were clarified.Using the on-site monitoring results from jacked rectangular pipe construction,the deformation patterns of the ground surface during jacked rectangular pipe construction and the deformation of the existing shield tunnel below the jacked pipe were analyzed.The traditional Peck formula was applied to circular pipe-jacking and circular shield tunnels;the improved Peck formula was used to describe the surface deformation caused by rectangular pipe-jacking.The surface deformation,pipeline deformation,and settlement pattern of the submerged tunnel caused by jacked pipes were analyzed based on field monitoring.The results show that the improved Peck formula can describe surface deformation caused by jacked rectangular pipes more accurately than the traditional Peck formula.The settlement patterns of the surface and pipeline caused by jacked pipes were consistent;however,there were differences in the settlement patterns of the underlying tunnel.
urban rail transitrectangular pipe-jackingground settlementexisting tunnelmodity Peck formula
万方数据
维普
