本文選題：穿越工程　切入點(diǎn)：隧道　出處：《北京交通大學(xué)》2017年碩士論文

【摘要】：隨著北京地鐵網(wǎng)絡(luò)的加密,新建隧道穿越既有地鐵結(jié)構(gòu)工程大量出現(xiàn)。由于地鐵安全運(yùn)營要求的嚴(yán)苛性,使得新建隧道穿越施工的難度增大、周期變長、經(jīng)濟(jì)成本增加。研究新建隧道穿越施工時既有地鐵結(jié)構(gòu)的變形規(guī)律,尋找一種快速可靠的變形預(yù)測方法,成為城市施工中急切需要解決的問題。本文以北京地區(qū)新建隧道穿越地鐵1號線、6號線等8個工程為依據(jù),進(jìn)行了分析研究。應(yīng)用相關(guān)性分析、正態(tài)性檢驗、高斯擬合以及數(shù)值模擬的方法,對新建隧道穿越工程中的既有地鐵結(jié)構(gòu)變形規(guī)律、預(yù)測方法做了深入的研究。取得以下主要成果:(1)通過對實(shí)測數(shù)據(jù)的分析研究,將既有地鐵結(jié)構(gòu)全施工周期變形歸納為六個階段:前期變形波動期、變形發(fā)展期、快速變形期、后期變形波動期、緩速沉降期、穩(wěn)定期。其中快速變形期是既有地鐵結(jié)構(gòu)變形幅度最大的階段,下穿工程中該階段的累積變形量占全施工周期最大變形量的63%～70%,上穿工程中則為82%～88%。(2)采用相關(guān)性分析等方法,研究了變形的影響因素。既有地鐵結(jié)構(gòu)的變形與新建隧道的開挖面積呈正相關(guān);與穿越間距、穿越夾角、是否采取加固措施呈負(fù)相關(guān);與新建隧道埋深、既有地鐵結(jié)構(gòu)埋深的相關(guān)性因穿越類型不同而變化。根據(jù)相關(guān)系數(shù)分析,各因素對既有地鐵結(jié)構(gòu)變形的影響程度由大到小依次為:穿越間距、新建隧道開挖面積、新建隧道埋深、既有地鐵結(jié)構(gòu)埋深、加固措施、穿越夾角。下穿工程中,其相關(guān)系數(shù)依次為:-0.559、0.524、-0.507、0.481、-0.44、-0.353;上穿工程中,其相關(guān)系數(shù)依次為:-0.887、0.67、0.586、-0.513、-0.505、-0.395。(3)采用正態(tài)性檢驗的方法證明了既有地鐵結(jié)構(gòu)變形服從正態(tài)分布,表明既有地鐵結(jié)構(gòu)整體變形呈“柔性”特征,與天然地層變形特征相似,但變形幅度要小于后者。(4)采用高斯擬合等方法,結(jié)合Peck公式,推導(dǎo)出了最大變形預(yù)測方程,該方程為經(jīng)驗方程,當(dāng)所在地區(qū)有大量的工程經(jīng)驗,對方程中的參數(shù)取值有較準(zhǔn)確的估計時,預(yù)測的準(zhǔn)確度會相應(yīng)提高。并采用實(shí)際工程和數(shù)值模擬方法驗證了預(yù)測方程的正確性。
[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，

本文編號：1704475