盾构施工对周围土体应力扰动研究综述

REVIEW OF THE IMPACT OF SHIELD TUNNELING ON SURROUNDING SOIL STRESS DISTURBANCE

随着地下隧道工程的增加,盾构掘进会改变隧道周围土体的应力状态,可能导致变形或沉降。探讨盾构掘进对隧道周围土体应力的影响对未来研究有很大的参考价值。文中总结现有成果,分类分析隧道周围水土压力变化、应力变化的影响因素及围压计算方法。研究表明盾构掘进引起的土压力和孔隙水压力变化具有相似规律,隧道周围应力变化受内外多因素影响,围压计算方法大多基于经验。缺乏全过程施工现场数据和大型模型试验,施工方法及地表荷载、地下水位等外部因素对土体应力的影响尚需深入研究,围压计算方法体系亟待完善。

With the increase in underground tunnel projects,shield tunneling can alter the stress state of the soil surrounding the tunnel,potentially leading to deformation or settlement.Exploring the impact of shield tunneling on the stress in the surrounding soil is of significant reference value for future research.This paper summarizes existing findings and classifies and analyzes the factors influencing changes in water and soil pressure around tunnels,as well as methods for calculating confinement pressure.The study indicates that the changes in soil pressure and pore water pressure caused by shield tunneling follow similar patterns,and the stress changes around the tunnel are influenced by multiple internal and external factors.Most confinement pressure calculation methods are based on empirical data.There is a lack of comprehensive construction site data and large-scale model tests,and the effects of construction methods,surface loads,groundwater levels,and other external factors on soil stress require further investigation.The system for calculating confinement pressure needs to be improved.