硬岩复合地层海域盾构掘进参数规律及优化研究  

Research on the Parameter Law and Optimization of Shield Tunneling inHard Rock Composite Strata in Sea Area

作　　者：杨飞 YANG Fei(Northwest Engineering of China Railway 14th Bureau Group Corporation Limited,Xi′an Shaanxi 710086,China)

机构地区：[1]中铁十四局集团西北工程有限公司,陕西西安710086

出　　处：《铁道建筑技术》2024年第1期163-167,194,共6页Railway Construction Technology

基　　金：山东工信厅技术创新项目(202250800313)。

摘　　要：以金塘海底隧道为研究对象,工程施工具有“长、深、险、精、难”的特点,运用统计分析手段,对盾构总推力、刀盘扭矩、掘进速度、刀盘转速的分布规律进行研究,并提出相应的掘进参数优化措施。结果表明:黏性土和砂性土盾构总推力平均值最大,总推力呈明显的“单峰”特征,复合地层总推力平均值次之,硬质岩层总推力最小;在黏性土、砂性土和硬质岩层中,刀盘扭矩均呈近似正态分布,硬质岩层扭矩平均值最大,黏性土和砂性土中次之,复合地层中最小;在所有地层中,掘进速度均呈明显的“单峰”特征,硬质岩中掘进速度平均值最小,复合地层中次之,黏性土和砂性土中最大且相近;在黏性土、砂性土和硬质岩层中,盾构刀盘转速分布范围均较集中,而在复合地层中则分布较为“宽广”,且其变异系数最大;在黏性土和砂性土中,盾构参数优化宜采取“大推力、高转速和大掘进速度”,在硬质岩层中宜采取“低推力、低转速、低掘进速度”,在复合地层中则应根据地层的变化进行动态调整。The construction characteristics of Jintang subsea tunnel are′long,deep,dangerous,precise,and difficult′.By using statistical analysis methods,the distribution characteristics of shield thrust,cutterhead torque,advance speed,and cutterhead rotation speed are studied,and corresponding shield driving parameter optimization measures are proposed.The results show that the average total thrust in cohesive soil and sandy soil is the highest,with a characteristic of′single peak′variation,followed by composite formation,and hard formation is the smallest;in cohesive soil,sandy soil,and hard rock layers,the cutterhead torque shows an approximate normal distribution,with the average torque of hard rock layers being the highest,followed by cohesive soil and sandy soil,and the minimum in composite layers;in all formations,the advance speeds are obviously′unimodal′characteristic,with the average excavation speed being the smallest in hard rock,followed by composite strata,and the highest and similar between cohesive soil and sandy soil;the distribution range of cutterhead rotation speed in cohesive soil,sandy soil,and hard rock layers,is relatively concentrated,while the distribution range is relatively′wide′in composite strata,and its coefficient of variation is the largest;in cohesive and sandy soils,the optimization of shield driving parameters should adopt by′high thrust,high cutterhead rotation speed,and high excavation speed′,while the′low thrust,low cutterhead rotation speed,and low excavation speed′should be adopted in hard rock formations,moreover,dynamic adjustments should be made according to changes in composite formations.

关 键 词：跨海铁路 硬岩 复合地层 盾构掘进 参数优化 隧道工程 甬舟高铁 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]