出入口基坑施工对下卧区间隧道变形影响的数值分析  

ANALYSIS OF DISTURBANCE-INDUCED DEFORMATION AND REINFORCEMENT SCHEME FOR A SMALL CLEAR DISTANCE UPPER SPAN SHIELD TUNNEL IN A FOUNDATION PIT

作　　者：冯川 Feng Chuan

机构地区：[1]中电建重庆勘测设计研究院有限公司,重庆401329

出　　处：《建筑技术开发》2025年第2期83-85,共3页Building Technology Development

摘　　要：基坑上跨既有隧道开挖施工将引起隧道结构扰动变形,需采取加固措施确保隧道结构变形稳定;结合某上跨区间隧道的出入口基坑实例,采用数值分析方法,计算了不同加固方案时基坑、隧道的变形规律,验证加固方案的合理性。对不加固方案对比分析,验证了采取基底加固+管幕反压加固方案合理且有效,基坑开挖约影响2倍基坑深度范围内隧道变形。The excavation of the existing tunnel over the foundation pit will cause disturbance and deformation of the tunnel structure,and reinforcement measures need to be taken to ensure the stability of the tunnel structure deformation;Taking the entrance and exit foundation pit of a certain cross section tunnel as an example,numerical analysis methods were used to calculate the deformation laws of the foundation pit and tunnel under different reinforcement schemes,and to verify the rationality of the reinforcement schemes.Comparative analysis of non reinforcement schemes has verified that the combination of foundation reinforcement and pipe curtain back pressure reinforcement is reasonable and effective,and excavation of the foundation pit affects tunnel deformation within a depth range of about twice the depth of the pit.

关 键 词：基坑 盾构隧道 加固方案 变形 

分 类 号：TU318.1[建筑科学—结构工程]