基于VSM沉井施工过程的井壁受力实测研究——以南京沉井式地下智能停车库工程为例  

Measuring of Shaft Wall Stress in Caisson Construction Process Based on Vertical Shaft Sinking Machine:a Case Study of Caisson-Type Underground Intelligent Parking Garage Project in Nanjing,China

作　　者：黄铭亮 张振光 徐杰 姜弘 包鹤立 柳献[1] HUANG Mingliang;ZHANG Zhenguang;XU Jie;JIANG Hong;BAO Heli;LIU Xian(College of Civil Engineering,Tongji University,Shanghai 200092,China;Shanghai Road and Bridge Group Co.,Ltd.,Shanghai 200433,China;Shanghai Engineering Research Center of Urban Infrastructure Renewal,Shanghai 200032,China;Shanghai Urban Construction Design&Research Institute(Group)Co.,Ltd.,Shanghai 200125,China)

机构地区：[1]同济大学土木工程学院,上海200092 [2]上海公路桥梁(集团)有限公司,上海200433 [3]上海城市基础设施更新工程技术研究中心,上海200032 [4]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）》2022年第6期1033-1043,共11页Tunnel Construction

基　　金：上海市科学技术委员会上海工程技术研究中心与专业技术服务平台项目(20DZ2251900);上海市青年科技英才扬帆计划(20YF1416200)。

摘　　要：VSM(垂直竖井掘进机)工法具有自动化程度高、施工速度快和施工占用场地小等技术优势,是一种适合在建筑密集区间建造竖井的新型工法。然而,VSM沉井施工过程中所受外荷载、沉井结构响应等施工力学行为尚不清晰,为探究VSM沉井井壁在施工过程中的受力和结构响应规律,通过对施工过程中井壁所受外部水土荷载、结构主筋应力和管片环间压力等进行监测,获取VSM沉井井壁所受的荷载作用和结构响应规律。研究结果表明:1)下沉过程中,竖井所受侧壁压力为膨润土泥浆压力;2)泥浆套助沉条件下侧壁摩阻力值极小,与膨润土泥浆剪切强度接近;3)铣挖下沉阶段,管片在内水压作用下有向外扩张的趋势特征;4)排浆固壁成井阶段,沉井井壁结构的环向、竖向均呈现压紧响应特征。Vertical shaft sinking machine(VSM) method has many advantages such as high automation degree,fast construction,and less construction field occupation,making it suitable for vertical shaft construction in the densely-built area.However,the construction mechanical behaviors such as external loads and caisson structural responses during the construction of VSM caisson are still unclear.The external soil and water loads on the shaft wall,the stress of the main reinforcement of the structure,and the pressure between the segments are monitored during construction to investigate the force and structural response law of the VSM caisson shaft wall,and the load action and structural response law of VSM caisson wall are obtained.The research reveals the following:(1) During the cassion sinking,the shaft wall bears the bentonite slurry pressure.(2) Under the condition of the slurry sleeve sinking,the shaft wall friction resistance value is extremely low,which is close to the shear strength of the bentonite slurry.(3) During milling sinking,the segment expands outward under the action of internal water pressure.(4) During slurry discharge and shaft wall formation,the shaft wall structure shows circumferentially and vertically compressive response.

关 键 词：VSM工法 沉井施工 井壁受力 沉井式地下智能停车库 装配式竖井 侧壁摩阻力 

分 类 号：U451.4[建筑科学—桥梁与隧道工程]