北京地铁隧道地表横向沉降槽参数分析

Analysis of Ground Transverse Settlement Groove Parameters of Beijing Metro Tunnel

为解决北京地铁隧道施工不同影响区划分和影响范围确定的不准确问题,对北京地区13条地铁线路、903份隧道工程的地表横向沉降槽资料进行分析,根据施工方法和地层条件的不同,分别对盾构法和矿山法施工隧道在黏性土地层、砂卵石地层等区域的沉降槽Peck公式拟合参数进行统计分析,得出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北京及类似地层条件的城市地铁隧道工程影响区划分和影响范围的确定;2)施工方法和地层条件是影响地铁隧道周围地层变形的重要因素,工程地表变形控制应注重相关研究;3)建议各地深入开展地铁隧道沉降槽的拟合分析研究,为隧道工程影响区划分和影响范围确定提供科学依据。

The construction influence zone of Beijing metro tunnel and the influence range are difficult to be distributed.As a result,the ground transverse settlement groove data of 903 tunnel projects of 13 metro lines in Beijing area are analyzed.The fitting parameters of Peck formula of settlement groove of clay stratum and sandy-cobble strata induced by shield tunneling and mining excavation are statistically analyzed,and the distribution shape,related statistics and correlation with tunnel buried depth of ground loss rate and width parameter are obtained.The research results show that:(1)The mathematical statistical results of ground loss rate and width parameter can guide the division of metro tunnel influence zone and determination of influence range in Beijing and other cities with similar ground conditions.(2)The construction method and stratum conditions are the important factors affecting the stratum deformation around the metro tunnel,and the relevant researches should be paid attention to in surface deformation control.(3)It is suggested to carry out in-depth analysis and research on the fitting of settlement groove in various regions,so as to provide scientific reference for the division and determination of metro tunnel influence zone.