基于间隙参数模型的盾构隧道周围土体位移分析

Analysis of ground movements due to shield tunneling by using a gap-parameter model

基于一种盾构加载模型并引进间隙参数的概念,对盾构隧道周围土体位移的机理及预测方法进行了总结。盾构相对于设计轴线的偏移是影响土体变形的主要原因之一。确定间隙参数是应用解析方法的关键步骤,提出了一个半经验、半解析方法,并针对一个工程实例把现场测量值和理论计算值进行了对比分析。

Based on a loading model for shield tunneling and the concept of gap parameter, the mechanism and a prediction method of shield tunneling-induced ground movements are introduced. The offsets of a tunnel shield from its design axis are the main cause for ground movements. Identification of the gap parameter is one of the most important steps when using an analytical method. A semi-empirical and semi-analytical approach is proposed; and as a case study of shield tunneling, the field-observed and the theoretically predicted ground movements are comparatively analyzed.