基于灰色关联理论的Peck法隧道地表移动参数影响研究

Surface Movement Parameters of Peck Method Tunnel Based on Gray Relational Theory

在预测隧道施工引起地表变形的算法中,Peck法发挥着重要作用。但该法对地表移动参数的研究往往依据经验,只考虑了部分因素的作用。针对这种局限性,在收集整理乌鲁木齐地铁1号线数据资料的基础上,借助数值模拟手段,运用灰色关联理论,对Peck法中的地表移动参数(沉降槽宽度系数i和地层损失率η)进行了研究。选取了土体参数、隧道设计指标和监测指标中的8个影响因子,计算其与i和η的关联性,得到以下结论:泊松比对i的影响远远高于其他因素;η的取值与内摩擦角的关联性较小,与其他7个影响因子的关联性差别不大,通过经验法综合考虑所有因素的取值是合理的。

Peck method plays an important role in predicting the ground surface deformation caused by tunnel construction,but the method only considers some factors based on experiences while studying the ground surface movement parameters.In view of this limitation,on the basis of collecting and sorting out the data of Urumqi metro Line 1,the surface movement parameters of Peck method(settlement trough width coefficient i and stratum loss rateη)are studied by means of numerical simulation and gray relational theory.8 influencing factors about soil parameters,tunnel design index and monitoring index are selected to calculate the correlation between the factor influence,coefficient i and loss rateη.The result shows Poisson′s ratio has a much higher influence on i than other factors,while the value ofηhas little correlation with the angle of internal friction,showing no significant difference in correlation with the other 7 factors.Therefore,it is reasonable to consider all factors through experience method.