上软下硬地层大直径盾构施工Peck沉降公式修正  

Correction of Peck Settlement Formula for Large Diameter ShieldConstruction in Upper Soft and Lower Hard Strata

作　　者：梅源[1,2] 史文艳 周东波 王蓉 徐望阳 Mei Yuan;Shi Wenyan;Zhou Dongbo;Wang Rong;Xu Wangyang(School of Civil Engineering,Xian University of Architecture and Technology,Xian 710055,P.R.China;Shaanxi Key Lab of Geotechnical and Underground Space Engineering,Xian University of Architecture and Technology,Xian 710055,P.R.China;School of Civil Engineering,Xian Traffic Engineering Institute,Xian 710300,P.R.China)

机构地区：[1]西安建筑科技大学土木工程学院,西安710055 [2]西安建筑科技大学陕西省岩土与地下空间工程重点实验室,西安710055 [3]西安交通工程学院土木工程学院,西安710300

出　　处：《地下空间与工程学报》2024年第6期1798-1805,共8页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(52178302);陕西省重点研发计划项目(2020SF-373)。

摘　　要：为合理预测大直径泥水盾构隧道施工引起的地表沉降,本文对现场实测数据进行回归分析,深入探讨了Peck公式在预测大直径泥水盾构施工引起的地表沉降方面的适应性,并在此基础上引入地表最大沉降修正系数α与沉降槽宽度修正系数β,对Peck公式进行了必要的调整与修正。结果表明:线性回归后大直径泥水盾构在上软下硬复合地层中掘进沉降实测值与Peck公式沉降预测值之间有较大差异;α取值分布在0.1~0.5范围内,β取值分布在0.5~1.0范围内时可以较好反映大直径泥水盾构在上软下硬地层中施工引起的地表沉降变形;对比分析小直径和大直径盾构隧道沉降槽修正系数可知,沉降槽修正系数的变化范围随开挖横截面面积的增大、开挖面土层性质差异的增大而增加。研究成果可扩大Peck公式的应用范围,为大直径盾构隧道设计和施工提供参考。In order to reasonably predict the surface settlement caused by the construction of large-diameter slurry shield,this paper conducts regression analysis on the actual measured data in the field and studies the adaptability of Pecks formula in the prediction of settlement of large-diameter slurry shield,while introducing the correction factorαfor the maximum surface settlement and the correction factorβfor the width of the settlement trough to correct Pecks formula.The results show that:There is a significant difference between the measured settlement value of large diameter slurry shield tunneling in upper soft and lower hard composite strata and the predicted settlement value of Peck formula after linear regression.When the value ofαis distributed between 0.1 and 0.5 and the value ofβis distributed between 0.5 and 1.0,it can better reflect the surface settlement deformation of large diameter slurry shield in the upper soft and lower hard strata.By comparing and analyzing the correction coefficients of settlement trough for small diameter and large diameter shield tunnels,it can be seen that the variation range of the correction coefficient of settlement trough increases with the increase of the excavation cross-sectional area and the difference in soil properties of the excavation surface.The research results can expand the application scope of the Peck formula and provide a reference for the design and construction of large diameter shield tunnels.

关 键 词：PECK公式 地表沉降 上软下硬地层 大直径泥水盾构 参数修正 

分 类 号：U25[交通运输工程—道路与铁道工程]