摘要
【目的】研究降雨与开挖耦合作用下,隧道-松散堆积体边坡正交体系的响应机制。【方法】以部分位于松散堆积体内的高速公路双洞隧道工程为例,采用有限元三维数值分析方法,分析不同工况下坡体与隧道支护结构的应力、位移及隧道二衬裂缝的发展演化规律,并结合现场监测数据探讨降雨开挖耦合作用下隧道-松散堆积体边坡正交体系的相互作用机制。【结果】坡体与隧道支护结构的应力与位移因降雨和开挖的耦合作用而增大,且降雨强度变化是主要影响因素。在降雨强度300 mm/d耦合开挖的工况下,典型断面ZK34+900处隧道最大主应力为仅开挖工况下的4.4倍,拱肩的横向位移为仅开挖工况下的2.7倍,坡体与支护结构的横向位移为仅开挖工况下的3~5倍;支护结构裂缝宽度随降雨强度的增加而增大了3~4.5倍;在降雨的持续作用下,松散堆积体边坡变形对隧道支护结构的影响范围由隧道拱肩逐渐扩展至隧道拱腰与拱脚,即影响深度与范围不断增加。【结论】研究成果可为降雨开挖耦合作用下隧道-松散堆积体边坡正交体系相互作用研究提供理论指导和工程应用参考。
[Purposes]This paper aims to investigate the response mechanisms of a tunnel-colluvial slope orthogonal system under coupled rainfall-excavation effects.[Methods]Using a highway twin tunnel project partially located within a colluvial deposit as a case study,this research employed 3D finite element numerical analysis to examine stress,displacement,and secondary lining crack evolution in the slope and tunnel support under varying conditions.Field monitoring data were integrated to explore interaction mechanisms between the tunnel and colluvial slope under coupled conditions.[Findings]The stress and displacement of the slope and tunnel support structure increase due to the coupling effect of rainfall and excavation,and the change of rainfall intensity is the main influencing factor.When the rainfall intensity is 300 mm/d and the coupling excavation condition is adopted,the maximum principal stress at the typical section ZK34+900 of the tunnel is 4.4 times that of the excavation-only condition;the horizontal displacement at the tunnel shoulder is 2.7 times that of the excavation-only condition;the displacement of the slope and the support structure is 3 to 5 times that of the excavation-only condition;the width of the cracks in the support structure increases by 3 to 4.5 times with the increase in rainfall intensity.With the continuous action of rainfall,the influence range of the deformation of the loose body slope on the tunnel support structure gradually expands from the tunnel shoulder to the tunnel arch waist and arch foot,that is,the influence depth and range continue to increase.[Conclusions]The results provide theoretical and practical guidance for interaction mechanisms in tunnel-colluvial slope orthogonal systems under coupled rainfall-excavation effects.
作者
黄政
张永杰
罗志敏
曹俊
HUANG Zheng;ZHANG Yongjie;LUO Zhimin;CAO Jun(School of Civil and Environmental Engineering,Changsha University of Science and Technology,Changsha 410114,China)
出处
《交通科学与工程》
2025年第4期125-134,共10页
Journal of Transport Science and Engineering
基金
国家自然科学基金项目(51878071)。
关键词
松散堆积体边坡
邻近隧道
降雨入渗
数值模拟
裂缝分析
colluvial slope
adjacent tunnel
rainfall infiltration
numerical analysis
crack analysis
