盾构法隧道施工中地层特性对地表沉降的影响  

Influence of Stratum Characteristics on Ground Surface Settlement in Shield Tunnel Construction

作　　者：曹威 Cao Wei(China Railway Tunnel Survey and Design Institute Co.,Ltd.,Tianjin,300308)

机构地区：[1]中铁隧道勘测设计院有限公司,天津300308

出　　处：《建设科技》2022年第8期126-128,共3页Construction Science and Technology

摘　　要：本文以汕头海湾隧道工程为研究对象,通过模拟仿真的方式,分析了盾构法隧道施工中地层特性对地表沉降的影响,经研究发现:当软土处于地表下0.23D时,不同区域所出现的沉降存在明显差异,其中,在深埋区域与拱顶区域,地表沉降为峰值,影响率在9.9214%以上;相同条件下,相对于轴线下侧的软土,上侧软土对地表沉降的影响更加显著,为前者的4±2.5倍;隧道施工时,地表沉降与盾构面压缩模量、粘聚力有关,两个参数值越大,沉降量越低,而与内摩擦角无关。Taking the Shantou Bay Tunnel Project as the research object,this paper analyzes the influence of the stratum characteristics on the ground surface settlement during the shield tunnel construction by means of simulation.The research shows that when the soft soil is 0.23D below the surface,there are obvious differences in the settlement in different areas.Among them,in the deep-buried area and the vault area,the surface settlement is the peak value,and the influence rate is above 9.9214%.Under the same conditions,compared with the soft soil on the lower side of the axis,the influence of the upper soft soil on the ground surface settlement is more significant than that of the former 4±2.5 times.During tunnel construction,the ground settlement is related to the compression modulus and cohesion of the shield surface,the larger the two parameters,the lower the settlement,which is independent of the internal friction angle.

关 键 词：盾构法 隧道工程 地层特性 地表沉降 

分 类 号：U455.43[建筑科学—桥梁与隧道工程] P642.26[交通运输工程—道路与铁道工程]