本文關(guān)鍵詞： 盾構(gòu)法施工 砂-黏復(fù)合地層 橫向沉降 沉降槽寬度系數(shù) 最大沉降量　出處：《鐵道標(biāo)準(zhǔn)設(shè)計(jì)》2017年09期 　論文類型：期刊論文

【摘要】：以深圳地鐵11號(hào)線寶安站—碧海站區(qū)間為工程背景,選擇具有正態(tài)分布性質(zhì)且能考慮沉降槽偏移的高斯峰值函數(shù),對(duì)該段地表實(shí)測(cè)沉降數(shù)據(jù)進(jìn)行曲線擬合,分析砂-黏復(fù)合地層條件下盾構(gòu)掘進(jìn)引起的地表沉降規(guī)律;并結(jié)合國(guó)內(nèi)外沉降槽寬度系數(shù)的計(jì)算理論,提出砂-黏復(fù)合地層沉降槽寬度系數(shù)。結(jié)果表明:高斯峰值函數(shù)擬合的沉降槽曲線與砂-黏復(fù)合地層條件下的工程實(shí)際更為契合;通過選取合適的參數(shù),可以運(yùn)用日本學(xué)者竹山·喬公式對(duì)砂-黏復(fù)合地層地表最大沉降值進(jìn)行預(yù)測(cè),砂-黏復(fù)合地層地表最大沉降值隨土的彈性模量的加權(quán)平均值的增大而減小;提出的砂-黏復(fù)合地層沉降槽寬度系數(shù)更能反映砂-黏復(fù)合地層特征,使沉降計(jì)算值更準(zhǔn)確。
[Abstract]:Based on the engineering background between Baoan station and Bihai station of Shenzhen Metro Line 11, Gao Si peak value function, which has normal distribution and can consider the migration of subsidence trough, is selected to fit the measured settlement data of this segment. The surface subsidence law caused by shield tunneling under the condition of sand and viscosity composite strata is analyzed. Combined with the calculation theory of width coefficient of settling tank at home and abroad. The results show that the curve of subsidence trough fitted by Gao Si's peak value function is more consistent with the engineering practice under the condition of sand and viscosity composite formation. By selecting the appropriate parameters, the maximum subsidence value of the sand and viscous composite strata can be predicted by using the Japanese scholar Takayama Joe formula. The maximum settlement value of the sandy clay composite strata decreases with the increase of the weighted average value of the elastic modulus of the soil. The width coefficient of settlement trough in sand-viscosity composite strata can reflect the characteristics of sand-viscosity composite strata and make the settlement calculation more accurate.
【作者單位】： 同濟(jì)大學(xué)道路與交通工程教育部重點(diǎn)實(shí)驗(yàn)室;上海市隧道工程軌道交通設(shè)計(jì)研究院;
【分類號(hào)】：P642.26;U455.43
【正文快照】： 盾構(gòu)法作為常用的隧道施工方法,與礦山法和明挖法相比,具有施工速度快、安全性高等特點(diǎn),因此已成為城市隧道施工的主要方法。雖然盾構(gòu)法理論與施工技術(shù)逐漸成熟,但在施工中仍存在地表沉降、工作面穩(wěn)定等工程問題,其中盾構(gòu)工作面引起周圍土體擾動(dòng)及引起的地表沉降則是最常見的

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