隧道开挖过程中应力释放及位移释放的相关关系研究

Study on the Correlation between Stress Release and Displacement Release DuringTunnel Excavation

研究目的:隧道的开挖过程既是一个位移逐渐释放的过程,也是一个应力逐渐释放的过程,本文采用数值模拟的方法分析了两者的相关关系。研究结论:二维分析表明:地层移动与应力释放率之间存在一定相关关系,但不同点的位移以及它们随应力释放率的变化规律之间差异比较明显,单个地选择某一点的位移来描述洞周位移的释放是片面的,采用开挖体积损失率来描述洞周位移的释放更为全面。研究同时也表明,地层体积损失率与应力释放率之间基本上成线性关系,该关系可为确定合理的应力释放率或体积损失率(位移释放率)提供参考。

Research purposes： The tunnel excavation is not only a process of gradual displacement release,but also a process of gradual stress release.This paper studies the correlation between stress release and displacement with numerical simulation method.Research conclusions：The two-dimensional analysis show that there is a certain correlation between the stratum movement and stress release.The displacements of different points and their varying laws of the stress release rate are of obvious differences.Choosing the displacement at one area to describe the displacement release around the tunnel is incomplete,while using the volume loss rate of tunnel excavation to describe the displacement release around the tunnel is more complete.The study results also show that the stratum volume loss rate and stress release rate are of a linear relationship basically.This relationship can be as the references to determining the reasonable stress release rate and volume loss rate（displacement release rate）.