上软下硬地层下盾构法施工的Peck预测公式修正

CORRECTION OF PECK PREDICTION FORMULA FOR SHIELD TUNNELING CONSTRUCTION UNDER UPPER-SOFT AND LOWER-HARD STRATA

以青岛地铁一号线某区间地表沉降实测数据为基础,采用回归分析方法并引入最大地表沉降修正系数、沉降槽宽度修正系数对Peck预测公式进行修正,得出适用于该区间上软下硬地层盾构法施工的Peck预测公式,研究表明:对该区间进行回归分析得到的沉降规律与实测数据较吻合,说明采用线性回归方法能较好预测该区间盾构隧道施工引起的地表沉降规律,当α在0.2~0.5区间,β在0.9~1.3区间时,所得到的修正Peck预测公式可以较准确预测该区间盾构隧道施工引起的地表沉降。

Based on measured data in a section of Qingdao Metro Line 1,the regression analysis method is used and the maximum surface settlement correction coefficientαand settlement trough width correction coefficientβis introduced to modify the formula,and obtain the Peck prediction formula suitable for shield tunneling construction in upper-soft and lower-hard strata in this section.The research shows that the regression analysis of the interval is the same with the measured data.It indicats that the linear regression method can better predict the surface subsidence caused by shield tunnel construction in the interval.Whenαin the interval of 0.2 to 0.5 andβin the interval of 0.9 to 1.3,the obtained modified Peck prediction formula can accurately predict the surface settlement caused by shield tunnel construction in the interval.