基于钻孔数据的盾构隧道纵向结构参数化计算

Parametric Calculation for Longitudinal Structure of Shield Tunnel Based on Geological Drilling Data

为推动盾构隧道工程数字化设计的发展,提升结构计算效率,提出一种基于地质钻孔数据的盾构隧道纵向结构参数化计算方法。本方法考虑了三维地质空间的不确定性以及隧道纵向结构的三维空间线型特点,利用K最近邻与普通克里金算法建立地层数据库;然后,与隧道轴线的空间信息建立引用关系,并输出结构约束条件与荷载大小;最后,利用等效刚度梁模型进行隧道纵向结构计算。以武汉市两湖隧道东湖段QXK6+300~+400区间为对象,将本方法与现有方法进行对比,结果表明:本方法的约束条件可以不依赖人工经验保守取值,而通过预编译的程序自动计算得出;同时,参数化计算流程有利于满足后续多区间核算需求,并且可以把内力分析结果精确地反映在三维应力云图上。因此,本方法能有效提升设计效率。

To promote digital designing in shield tunnel construction and improve structural calculation efficiency,a parametric calculation method for longitudinal structures of shield tunnels based on geological drilling data is proposed.The method considers geological uncertainties and the three-dimensional(3D)spatial linearity of the tunnel longitudinal structure,uses K-Nearest Neighbor and Ordinary Kriging algorithms to establish a strata database.Then,the reference relation to the structure′s space information of the tunnel axis is created to output load and constraint conditions of the structure.Finally,the equivalent stiffness beam method is employed to conduct longitudinal structure calculation.The method was applied to the QXK6+300~+400 section of the east lake section of the Lianghu tunnel in Wuhan,China.The comparative analytical results between the method proposed and the existing one indicate that the constraint conditions of the method proposed can be automatically calculated through programming without relying on conservative evaluation by humans.In addition,the parametric process meets the subsequent calculation requirements on various sections and can reflect the results of internal force analysis in 3D stress nephogram.Therefore,the proposed method can improve the design efficiency.