北京地区新建隧道穿越既有地铁结构的变形规律研究

发布时间：2018-04-03 08:47

  本文选题：穿越工程　切入点：隧道　出处：《北京交通大学》2017年硕士论文

【摘要】：随着北京地铁网络的加密,新建隧道穿越既有地铁结构工程大量出现。由于地铁安全运营要求的严苛性,使得新建隧道穿越施工的难度增大、周期变长、经济成本增加。研究新建隧道穿越施工时既有地铁结构的变形规律,寻找一种快速可靠的变形预测方法,成为城市施工中急切需要解决的问题。本文以北京地区新建隧道穿越地铁1号线、6号线等8个工程为依据,进行了分析研究。应用相关性分析、正态性检验、高斯拟合以及数值模拟的方法,对新建隧道穿越工程中的既有地铁结构变形规律、预测方法做了深入的研究。取得以下主要成果:(1)通过对实测数据的分析研究,将既有地铁结构全施工周期变形归纳为六个阶段:前期变形波动期、变形发展期、快速变形期、后期变形波动期、缓速沉降期、稳定期。其中快速变形期是既有地铁结构变形幅度最大的阶段,下穿工程中该阶段的累积变形量占全施工周期最大变形量的63%～70%,上穿工程中则为82%～88%。(2)采用相关性分析等方法,研究了变形的影响因素。既有地铁结构的变形与新建隧道的开挖面积呈正相关;与穿越间距、穿越夹角、是否采取加固措施呈负相关;与新建隧道埋深、既有地铁结构埋深的相关性因穿越类型不同而变化。根据相关系数分析,各因素对既有地铁结构变形的影响程度由大到小依次为:穿越间距、新建隧道开挖面积、新建隧道埋深、既有地铁结构埋深、加固措施、穿越夹角。下穿工程中,其相关系数依次为:-0.559、0.524、-0.507、0.481、-0.44、-0.353;上穿工程中,其相关系数依次为:-0.887、0.67、0.586、-0.513、-0.505、-0.395。(3)采用正态性检验的方法证明了既有地铁结构变形服从正态分布,表明既有地铁结构整体变形呈“柔性”特征,与天然地层变形特征相似,但变形幅度要小于后者。(4)采用高斯拟合等方法,结合Peck公式,推导出了最大变形预测方程,该方程为经验方程,当所在地区有大量的工程经验,对方程中的参数取值有较准确的估计时,预测的准确度会相应提高。并采用实际工程和数值模拟方法验证了预测方程的正确性。
[Abstract]:With the encryption of Beijing subway network, a large number of new tunnels through the existing subway structure projects appear.Due to the strict requirements of subway safety operation, the construction of new tunnel crossing is more difficult, the period becomes longer, and the economic cost increases.It is an urgent problem in urban construction to study the deformation law of existing subway structure and find a fast and reliable deformation prediction method.Based on 8 projects of new tunnel crossing Metro Line 1 and Line 6 in Beijing area, this paper makes an analysis and study.By means of correlation analysis, normality test, Gao Si fitting and numerical simulation, the deformation law and prediction method of existing subway structures in new tunnel crossing project are studied.Through the analysis and study of the measured data, the deformation of the existing subway structure during the whole construction period is summarized into six stages: the early deformation fluctuation period, the deformation development period, the rapid deformation period, the late deformation fluctuation period,Slow settling period, stable period.Among them, the rapid deformation period is the stage with the largest deformation range of the existing subway structure. The cumulative deformation amount in this stage accounts for 6370% of the maximum deformation amount in the whole construction cycle in the underpass project, and the correlation analysis method is used in the top penetrating project (82%).The influence factors of deformation are studied.The deformation of the existing subway structure is positively related to the excavation area of the newly built tunnel; it is negatively correlated with the crossing distance and the angle of crossing, whether to take reinforcement measures; and it is related to the buried depth of the new tunnel.The correlation of the buried depth of the existing subway structure varies with the type of traversing.According to the analysis of correlation coefficient, the influence degree of each factor on the deformation of existing subway structure is as follows: crossing distance, excavation area of new tunnel, buried depth of newly built tunnel, buried depth of existing subway structure, reinforcement measures and crossing angle.涓嬬┛宸ョ▼涓，

本文编号：1704475