Peck公式在我国隧道施工地面变形预测中的适用性分析

An adaptability study of Gaussian equation applied to predicting ground settlements induced by tunneling in China

在目前众多的预测地铁隧道开挖引起的地表位移的经验方法中,Peck于1969年提出的高斯方程最简便,也是目前应用最为广泛的方法。由于这一公式是基于有限地区的实测资料提出的,因此,在某个地区应用前首先应该进行基于当地实测资料的验证工作。国内地铁建设工作起步相对较晚,在土中开挖的浅埋隧道工程引起的地层变形实测资料比较缺乏,因此,目前对Peck公式在国内各地区的适用性还没有定论。近年来,随着地铁建设热潮的兴起,各地逐渐积累了一些实测资料,但仍比较零散,也没有形成比较统一的结论。通过对搜集到的国内8个地区30多组观测数据的分析,评价这一方法在不同地区的适用性,并对相关计算参数提出初步建议值。

Gaussian equation suggested by professor Peck in 1969 is one of the most popular-used methods to predict the soft ground movement induced by shallow tunneling work. The application of this method in China should be carefully verified and evaluated since it was suggested based on case history studies. Because of the lack of the well-compiled measured data in China, there is no clear conclusion on the adaptability of the Gaussian equation to predict the ground movement induced by the metro tunneling until now. Based on the collection of the published case history analysis, including more than 30 sets of measured data from eight areas in China, the accuracy of the Gaussian equation applied to predict the ground settlement is discussed and evaluated in detail, some typical key parameters are also suggested to the designers.