冻结暗挖法与明挖法在地下通道工程中的组合应用  

Combined Application of Freezing Mining Method and Open-Cut Method in Underground Passage Engineering

作　　者：贺腾飞 王文渊 HE Tengfei;WANG Wenyuan(Shanghai Urban Construction Design&Research Institute(Group)Co.,Ltd.,Shanghai 200125,China)

机构地区：[1]上海市城市建设设计研究总院(集团)有限公司,上海200125

出　　处：《隧道建设（中英文）》2024年第S01期418-426,共9页Tunnel Construction

基　　金：上海市科学技术委员会科研项目(17DZ2251900;22dz1201204)。

摘　　要：为解决地下空间开发中紧贴既有结构新建地下通道工程遇到的建设技术难题,以上海虹镇老街地下通道项目为工程背景,阐述一种冻结法的创新应用实践,将冻结暗挖法与明挖法相结合,结合局部逆作,应用于紧贴既有结构的新建地下通道工程。对该技术的设计方案、冻结方案、实施过程、实施效果进行研究,对监测数据进行分析。得到以下结论:1)该技术将冻结暗挖法与明挖法相结合,经实际工程验证其具有可行性。2)施工监测数据显示,新建地下通道施工期间,既有地铁1号出入口结构变形在可控范围内,该技术可满足既有地下通道不停运、新建通道对既有结构低影响的建设需求。3)采取间歇冻结、开启卸压孔卸压措施,可有效控制冻胀带来的不利影响,采取措施后冻胀影响引起的结构竖向变形7 d内变化量可减少40%~75%。To solve the technical problems encountered in the construction of new underground passage projects close to the existing structure in the development of underground space,based on the underground tunnel project of Old Hongzhen Street in Shanghai,the authors expound an innovative application practice of freezing method.This method combines freezing mining method with open-cut method and local reverse building method,and can be applied to the new underpass project close to the existing structure.The design scheme,freezing scheme,implementation process,implementation effect,and monitoring data are analyzed.The following conclusions are drawn:(1)The combination of freezing mining method and open-cut method is workable and has been approved by practical engineering.(2)The construction monitoring data show that during the construction of the new underground passage,the structural deformation of the existing metro entrance No.1 is within the controllable range.The technology can achieve the purpose that the existing metro passage is not stopped and the new passage has low impact on the existing subway structure.(3)The measures of intermittent freezing and opening pressure relief holes can effectively control the adverse effects of frost heaving,and the vertical deformation of the existing structure caused by frost heaving can be reduced by 40%to 75%within 7 days after taking the measures.

关 键 词：冻结法 暗挖法 明挖法 地下通道 地铁出入口 变形控制 

分 类 号：U45[建筑科学—桥梁与隧道工程]