土层参数对盾构隧道引起的地表沉降影响分析  

Analysis of Influence of Soil Layer Parameters on Surface Settlement Caused by Shield Tunnel

作　　者：苗占府 Miao Zhanfu(Xingtai Road Bridge Construction Engineering Co.,Ltd.,Xingtai 054001,China)

机构地区：[1]邢台道桥建设工程有限公司,邢台市054001

出　　处：《北方交通》2021年第2期84-87,共4页Northern Communications

摘　　要：土层特性是影响隧道开挖稳定性的重要因素之一,研究土层参数对隧道开挖引起的地表沉降影响规律具有重要意义。以某城市隧道施工为例,采用有限元软件ABAQUS进行数值模拟,将实测数据与数值结果进行分析对比,并对土层参数的影响进行了详细分析,得出以下结论:现场实测地表沉降数据与数值模拟监测到的地表沉降数据均呈现出高斯分布形式,且二者吻合良好,说明数值模拟结果是正确且适用的;增大土体的压缩模量、内摩擦角和粘聚力时,地表沉降基本上呈现出线性减小,采用线性函数进行拟合时,三者的相关系数分别为0.87、0.34和0.90;对于隧道在软黏土等特殊土中施工时,以上参数分析结果可为土体的加固设计和施工提供一定的参考。The characteristics of the soil layer is one of the important factors that affect the stability of tunnel excavation.It is of great significance to study the influence of soil layer parameters on the law of surface settlement caused by tunnel excavation.Taking the construction of a city tunnel as an example,the finite element software ABAQUS was used for numerical simulation,the measured data and the numerical results were analyzed and compared,and the influence of the soil layer parameters was analyzed in detail to obtain the following conclusions:the surface settlement data monitored and numerical simulations all show a Gaussian distribution,and the two agree well,indicating that the numerical simulation results are correct and applicable;when the soil's compressive modulus,internal friction angle,and cohesion are increased,the surface subsidence basically shows a linear decrease.When the linear function is used for fitting,the correlation coefficients of the three are 0.87,0.34 and 0.90 respectively.For the tunnel constructed in soft clay and other special soils,the parameter analysis results in this paper can provide certain reference for the soil design and construction of soil reinforcement.

关 键 词：盾构隧道 地表沉降 参数分析 数值模拟 

分 类 号：U445.43[建筑科学—桥梁与隧道工程]