长春地层地铁隧道施工的Peck公式改进

Peck利用高斯方程提出预测地铁隧道开挖引起的地表位移的方法是目前众多经验方法中最为简便也是应用最为广泛的方法,但这一公式具有相应的局域性,对不同地区的适用性尚未有明确结论。本文以长春地区地铁隧道开挖施工为研究实例,通过对施工过程中大量地表沉降实测数据进行分析,利用线性回归的数学方法,引入两个修正系数:地表最大沉降修正系数α、沉降槽宽度修正系数β,对在长春地区地质条件下由地铁隧道施工引起的地表沉降进行分析研究。结果表明:长春地铁一号线施工区绝大部分实测地表沉降数据都可以较好的进行高斯分布拟合,且当α介于0.3~0.7之间、β介于0.6~1.0之间,Peck公式改进后所绘曲线更接近地表实测沉降数据,使预测效果更好。

Improvement of Peck Formula in Subway Construction in Changchun

Gaussian equation suggested by Professor Peck is one of the most popular-used methods to predict the soft ground movement induced by shallow tunneling work.This formula is based on the measured data presented in a limited area.This paper takes a lot of ground subsidence measured data in Changchun subway tunnel foundation excavation,combined with the application of mathematical methods of least squares linear regression method.Two correction factors were introduced:the maximum surface subsidence correction coefficient α and the width of settlement trough correction factor β.As is found,curve plotted with the measured surface subsidence curve fitting formula after Peck approximate match,indicating that the use of linear regression fit the measured data of surface deformation curve to predict the formation of ground subsidence caused by metro tunnel construction is feasible.Through regression analysis,a more accurate prediction curve can be obtained when α is between 0.3～0.7 andβ is between 0.6～ 1.0.