摘要
Peck公式广泛运用于盾构隧道施工引起的地表沉降预测,沉降槽宽度i和地层损失率η是该公式的两个主要参数。目前,在既有的关于盾构施工导致的地表沉降计算公式中,未考虑复合地层条件对地表沉降槽宽度的影响,计算公式中没体现复合地层中各层土的弹性模量和内摩擦角对其的量化关系。利用土层力学参数的算数平均值和加权平均值反映复合地层上覆土的特征,采用三维数值方法研究了土体弹性模量和内摩擦角对地表沉降的影响规律,根据O′Reilly和News公式对成都轨道交通17号线盾构隧道砂卵石泥岩复合地层条件下的沉降槽宽度系数k值进行统计,提出了可考虑该复合地层特征的沉降槽宽度i的计算公式。基于成都轨道交通30号线高碑坝复合地层区间盾构隧道地表沉降的实测数据,经反分析得出此区间盾构隧道施工导致的地表沉降槽宽度值,利用本文公式进行实例验证,结果显示拟合效果良好。研究成果可为今后利用Peck公式预测复合地层盾构施工导致的地表沉降提供参考。
Peck formula is widely used in the prediction of surface settlement caused by shield construction,the settlement trough widthiand volume lossηare the two main parameters of the formula.At present,in the existing formulas for calculating the ground surface settlement caused by shield construction,the influence of composite stratum conditions on the settlement trough width has not been considered,and these formulas can not reflect the quantitative relationship of the elastic modulus and internal friction angle of each layer of soil in composite stratum.In this paper,the arithmetic mean value and weighted mean value of mechanical parameters of soil layers are used to reflect the characteristics of overlying soils in composite stratum.The influence of elastic modulus and internal friction angle of soils on ground surface settlement is studied by three-dimensional numerical method.Based on the O’Reilly and News formulas,the settlement trough width coefficient k of the shield tunnel of Chengdu rail transit line 17 is statistically calculated,and the calculation formula of settlement trough width iconsidering the characteristics of sandy pebble mudstone composite stratum is put forward.Combined with the measured data of the ground surface settlement of the shield tunnel in the composite stratum section of Gaobeiba section of Chengdu rail transit line 30,the surface settlement trough width of caused by the shield tunnel construction in this section is obtained through back analysis,the settlement trough width calculated by the formula proposed in this paper fits well with the measured results.
作者
赵东平
沈振东
王风
李栋
王柱琰
ZHAO Dongping;SHEN Zhendong;WANG Feng;LI Dong;WANG Zhuyan(Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu 610031;Southwest Jiaotong University,Chengdu 610031;The No.8 Engineering Co.,Ltd.of CCCC First Highway Engineering Group Co.,Ltd.,Tianjing 300170)
出处
《现代隧道技术》
CSCD
北大核心
2022年第S01期32-41,共10页
Modern Tunnelling Technology
基金
四川省科技厅面上项目(2022NSFSC0318)
中交一公局集团有限公司科研课题(X-GD-8GS(J)-SIC-CDDT-02-JS-003,X-GD-8GS(J)-SIC-CDDT-02-JS-004)
关键词
盾构隧道
地表沉降
PECK公式
砂卵石泥岩复合地层
沉降槽宽度
Shield tunnel
Ground surface settlement
Peck formulation
Sandy pebble mudstone composite stratum
Settlement trough width
作者简介
赵东平(1979-),男,工学博士,正高级工程师,副教授,主要从事隧道科研及设计工作,E-mail:704215958@qq.com.
