地铁双线盾构区间地表横向沉降槽参数分析

The Ground Transverse Settlement Tank Parameters Analysis of Subway Double Line Shield Section

城市地铁盾构隧道的横向变形特点是确定工程影响区域和影响范围的重要依据。对我国22个建设城市的58条地铁线路、126个区间、964个地表横向沉降槽资料进行分析,研究了地铁双线盾构区间隧道的地表横向变形特点。根据地层条件的不同,对不同地层区域的沉降槽Peck公式拟合参数进行统计分析,得出了地层损失率和宽度参数的分布形态、相关统计值以及与隧道相对埋深的相关性。研究结果表明:(1)地层损失率和宽度参数的数理统计结果可以很好地指导不同地层区域地铁双线盾构隧道工程的影响区划分和影响范围的确定;(2)建议各地结合地层条件特点,对地表沉降槽进行深入研究,以提出更为适宜的地表横向沉降槽预测参数。

The transverse deformation characteristics of urban metro shield tunnel are the important basis for determining the influence area and influence scope.The ground transverse settlement tank data of 22 cities,58 metro lines,126 sections and 964 tunnel projects in China are analyzed.The ground transverse deformation characteristics of subway double line shield section are studied.According to the stratum conditions,the Peck formula fitting parameters of tunnel settlement tank are statistically analyzed in different strata areas.The distribution pattern and relevant statistics of formation loss rate and width parameters are obtained,and their correlation to the tunnel relative burial depth are given.The research results show that:(1)The mathematical statistics results of formation loss rate and width parameters can guide the influence area division and influence scope determination of subway double line shield tunnel engineering;(2)In combination with the stratum conditions,it is suggested to carry out in-depth analysis and research on the settlement tank in various regions.So that,the more suitable prediction parameters of ground transverse settlement tank may be proposed.