近接隧道盾构施工的力学影响与施工对策研究

Study on Mechanical Influence and Construction Countermeasures of Adjacent Tunnel Shield Construction

通过对某近接区间隧道盾构施工的数值仿真和计算,研究在平面重叠的隧道施工中,后推进隧道施工对既有线管片的应力重分布影响。对比不同施工顺序导致地表沉降的数值计算值,并结合现场地面沉降观测值,证实了在近接隧道盾构施工中使用数值仿真计算的方法可行,先浅后深的施工工序有利于地表沉降与隧道构件应力控制。

Abstract： The influence of back-propelling tunnel segments in the plane overlapping tunnel construction construction to the stress redistribution of the existing is studied via numerical simulation and calculation of the shield construction of an adjacent running tunnel. It is proved that the numerical simulation method for the shield construction of adjacent tunnel is feasible comparing numerical values of ground settlement caused by different construction sequences and combining with the site observed value of ground settlement. It puts forward that the construction sequence that first shallow followed by deep is helpful to the ground settlement and stress control of tunnel structures.