软土隧道地表长期沉降的粘弹性流变与固结耦合分析

ANALYSIS OF LONG-TERM SETTLEMENTS OVER TUNNELS USING VISCO-ELASTIC CONSTITUTIVE MODEL COUPLED WITH CONSOLIDATION THEORY

随着城市地铁的大量投入使用,软土隧道长期沉降问题也得到越来越多的重视.为了研究软土隧道长期沉降随时间的发展规律,采用粘弹性流变模型并耦合太沙基固结理论对软土隧道地表长期沉降进行了分析、预测.结果表明,软土隧道的长期沉降持续时间长,和瞬时沉降相比,长期沉降量也比较显著.计算发现,耦合太沙基固结理论的粘弹性流变分析方法是隧道长期沉降分析的一种简化有效的计算方法.

The evolutions of long-term settlements of tunnels in soft clays are essential to the safety of the urban tunnels and the surrounding buildings.A closed visco-elatic rheological form coupled with Terzaghi's consolidation theory is employed to predict the long-term surface settlements of tunnels.Compared with the short-term surface settlements,the long-term settlements are rather significant and developed in a quite long duration.The satisfactory agreement between observed and predicted long-term settlements indicates that the adopted analytical method is a reasonable and convenient way to estimate the development of long-term settlements of tunnels with time.