欠固结地层盾构施工土体长期沉降分析  

Long-term Settlement Analysis of Soil Mass during Shield Tunneling Construction in Underconsolidated Strata

作　　者：王建 Wang Jian(Guangdong Yihua Transportation Engineering Testing Co.,Ltd.,Zhongshan 528455,China)

机构地区：[1]广东逸华交通工程检测有限公司,中山市528455

出　　处：《北方交通》2024年第10期39-43,共5页Northern Communications

摘　　要：为研究欠固结地层中盾构隧道施工后周边地层的长期沉降特性,以及双曲线和指数曲线数学模型预测周边地层长期沉降的适应性,依托广州市某地铁隧道项目进行长期监测。结果表明:欠固结地层盾构施工后的实测沉降数据包含欠固结地层自身沉降和盾构施工引起的地层沉降。以各测点的增量沉降值绘制曲线,当横向土体增量沉降曲线不成槽后,实测沉降基本为欠固结地层的自身沉降。同一平面位置处,埋深越大的测点,其总长期沉降量越小,相对于盾构隧道施工前的地层原始状态,盾构施工后的隧道周边土体呈现密实化趋势。In order to study the long-term settlement characteristics of the surrounding strata after the shield tunneling construction in underconsolidated strata,as well as the adaptability of mathematical models of hyperbolic and exponential curves to predict the long-term settlement of the surrounding strata,the long-term monitoring is carried out based on a subway tunnel project in Guangzhou.The results show that:the measured settlement data after the shield tunneling construction in underconsolidated strata includes the self settlement of the underconsolidated strata and the stratum settlement caused by the shield tunneling construction.The curve is drawn based on the incremental settlement values of each measuring point.When the lateral soil incremental settlement curve does not form a trough,the measured settlement is basically the self settlement of the underconsolidated strata.At the same plane position,the greater the burial depth of the measuring point,the smaller the total long-term settlement.Compared with the original state of the strata before the shield tunneling construction,the soil mass around the tunnel after the shield tunneling construction shows a trend of densification.

关 键 词：欠固结地层 盾构施工 数学模型 长期沉降 监测 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]