盾构隧道引起地层损失和地表沉降的离心模型试验研究

近年来，越来越多的盾构隧道穿越建筑密集区、重点建筑保护区和沉降敏感区，地面沉降的科学预测和合理控制成为亟待解决的问题。地层损失是盾构施工引起地表沉降的主要原因。利用离心模型试验对盾构隧道的地层损失进行了模拟，研究了地层损失与施工期及工后地表沉降的关系。通过量测、分析隧道纵向沉降、纵向应变、隧道周围土压力和超孔隙水压力的变化，研究了隧道的纵向沉降特性。

Centrifuge modeling of ground loss and settlement caused by shield tunnelling in soft ground

Recently,a large number of shield tunnels were built in the areas with dense buildings and protected buildings and those vulnerable to ground deformation,thus predicting and controlling the surface settlement induced by shield tunnelling has become a serious problem to be addressed.Since ground loss during the construction process of shield tunnels is one of the main factors causing the surface settlement,its effects are simulated using centrifugal model tests,and the relations between the rate of ground loss and surface settlement are studied during the construction and post-construction periods.The longitudinal behaviours of the tunnels are also studied by measuring and analyzing their longitudinal settlement,stress and strain,and surrounding earth pressure.