有限空间下硬岩地层小截面竖井开挖施工技术  

Construction Technology for Small Cross Section Vertical Shaft Excavation in Hard Rock Strata Under Limited Space

作　　者：陈泽盟 李帅 陈浩然 CHEN Zemeng;LI Shuai;CHEN Haoran(CCCC-SHEC Forth Engineering Co.,Ltd.,Luoyang,Henan 471000,China;CCCC Second Harbor Engineering Construction Technology Co.,Ltd.,Wuhan,Hubei 430050,China)

机构地区：[1]中交二公局第四工程有限公司,河南洛阳471000 [2]中交二航局建筑科技有限公司,湖北武汉430050

出　　处：《施工技术(中英文)》2025年第7期151-156,共6页Construction Technology

基　　金：国家自然科学基金(U1604135);中交第二公路局有限公司重点科研项目(2023-3-17);河南省科技厅产学研合作项目(2015HNCXY011)。

摘　　要：竖井作为城市轨道交通建设中的重要环节,施工时通常会面临特殊地质条件及复杂环境等情况,风险较大。以重庆市轨道交通15号线二期土建工程13标段竖井工程为依托,通过有限元软件MIDAS GTS NX对竖井开挖过程进行模拟,分析开挖后竖井支护结构及围岩的稳定性,并针对有限空间下硬岩地层竖井施工进行了技术总结。研究结果表明:随着开挖进行,下层支护结构受力不断减小,围岩竖向位移沿井壁向下不断降低,围岩最大应力出现在竖井底部未开挖中间位置。针对有限空间下硬岩地层小截面竖井开挖问题,选用旋挖钻引孔、倒挂井壁法施工,保证了施工效率和安全性。As an important part of urban rail transit construction,shafts usually face special geological conditions and complex environments during construction,and the risk is high.Based on the shaft project of the 13th bid section of the second phase of the civil engineering project of Chongqing Rail Transit Line 15,the excavation process of the shaft is simulated by the finite element software MIDAS GTS NX,and the stability of the supporting structure and surrounding rock of the shaft after excavation is analyzed,and the construction of the shaft in the hard rock stratum under the limited space is summarized.The results indicate that with the excavation,the stress of the lower supporting structure decreases continuously,the vertical displacement of the surrounding rock decreases continuously along the shaft wall,and the maximum stress of the surrounding rock appears at the middle position of the bottom of the shaft without excavation.Aiming at the excavation problem of a small cross-section shaft in hard rock stratum under limited space,the method of rotary drilling to guide holes and the reversed shaft wall method is selected to ensure the construction efficiency and safety.

关 键 词：轨道交通 竖井 硬质岩层 有限元分析 施工技术 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]