STATE OF THE LONG-TERM SETTLEMENT BEHAVIOR OF THE METRO TUNNEL IN SHANGHAI

摘要

Based on a large amount of field data, the behavior of post-construction settlement of shield tunnel is acquired. There was a large magnitude of cumulative settlement with great differential settlement of tunnel during the long-term operation. The settlement was very fast in the previous two years with a speed of 40～50 mm then the speed slowed down. Large scales of differential settlement mainly occurred in guiding sections, communication passages, tunnel- station joints and river-crossing sections. The influence factors are attributable to the land subsidence, the construction method, the sub-soil conditions, the disturbance of nearby construction, the leakage of ground water, and the train vibration.