本文關(guān)鍵詞：土壓平衡盾構(gòu)掘進(jìn)對上軟下硬地層擾動研究　出處：《巖石力學(xué)與工程學(xué)報》2017年04期 　論文類型：期刊論文

  更多相關(guān)文章： 隧道工程 土壓盾構(gòu) 室內(nèi)試驗 上軟下硬地層 地層擾動 超挖 DEM

【摘要】：采用Ф800 mm模型盾構(gòu)開展室內(nèi)掘進(jìn)試驗以研究土壓盾構(gòu)掘進(jìn)對上軟下硬地層的擾動特征,試驗充分考慮土壓盾構(gòu)動態(tài)施工全過程的影響。建立與室內(nèi)掘進(jìn)試驗對應(yīng)的離散元模型定量分析軟土超挖現(xiàn)象并挖掘其他地層擾動信息。研究結(jié)果表明:土壓盾構(gòu)在硬巖地層中掘進(jìn)時地表沉降曲面呈現(xiàn)向軟土側(cè)展開的"扇面"狀;進(jìn)入上軟下硬地層后地表沉降值與范圍均急劇增加,沉降曲面呈現(xiàn)自上而下逐漸收縮的"漏斗"狀,硬巖側(cè)收縮速度快于軟土側(cè);上軟下硬地層地表位移小于均質(zhì)軟土地層,而地中沉降顯著大于后者;上軟下硬地層地中沉降槽寬度參數(shù)沿深度方向呈指數(shù)增加,硬巖占斷面比例越小,地中沉降槽寬度參數(shù)越大。相同埋深條件下,上軟下硬地層地中沉降槽寬度參數(shù)小于均質(zhì)軟土地層。硬巖占斷面比例越大,渣土中砂土所占比例與相應(yīng)理論值差異越明顯。地表水平位移在豎向沉降槽曲線反彎點處最大。研究可為土壓盾構(gòu)在上軟下硬地層施工提供參考。
[Abstract]:In order to study the disturbance characteristics of the earth pressure shield tunneling on the upper soft and hard ground, the indoor tunneling test was carried out by using the 800 mm shield tunneling model. The effect of dynamic construction of earth pressure shield is taken into account in the test. The discrete element model corresponding to the indoor tunneling test is established to quantitatively analyze the phenomenon of soft soil overdigging and to excavate the information of other strata disturbance. The results show that:. When the earth pressure shield tunneling in the hard rock stratum, the surface subsidence surface presents the "sector" shape which extends to the soft soil side; After entering the upper soft and hard strata, the surface subsidence value and range increase sharply, the subsidence surface presents the "funnel" shape of gradually shrinking from the top to the bottom, and the contraction speed of the hard rock side is faster than that of the soft soil side. The surface displacement of upper soft and lower hard strata is less than that of homogeneous soft soil, and the settlement in the ground is significantly larger than that of the latter. The width parameter of subsidence trough increases exponentially along the depth direction. The smaller the ratio of hard rock to the section, the larger the width parameter of subsidence trough in the ground. The width parameter of subsidence trough in upper soft and lower hard stratum is smaller than that in homogeneous soft soil. The ratio of hard rock to cross section is larger. The difference between the proportion of sand and the corresponding theoretical value is more obvious. The horizontal displacement of the earth surface is the largest at the reverse bending point of the vertical settlement trough curve. The study can provide a reference for the construction of the earth pressure shield in the upper soft and hard ground.
【作者單位】： 西南交通大學(xué)交通隧道工程教育部重點實驗室;
【基金】：國家科技支撐計劃(2013BAB10B02,2013BAB10B04) 2014年度西南交通大學(xué)博士研究生創(chuàng)新基金資助項目~~
【分類號】：U455.43
【正文快照】： 盾構(gòu)法以安全、快速、對周圍環(huán)境影響小等優(yōu)點,在城市軌道交通建設(shè)領(lǐng)域得到了廣泛運(yùn)用。我國幅員遼闊,地質(zhì)條件復(fù)雜多變,盾構(gòu)隧道穿越地層的工程力學(xué)性質(zhì)往往是影響施工成敗的關(guān)鍵因素。上軟下硬地層是我國廣州、深圳、福州等地區(qū)地鐵建設(shè)中遇到的一種典型地質(zhì)條件,具有巖土體

【相似文獻(xiàn)】

相關(guān)期刊論文 前1條

1 劉濤;趙松壯;孫付峰;;上軟下硬地層淺埋大跨度車站拆撐安全性分析[J];巖土力學(xué);2014年S1期

相關(guān)碩士學(xué)位論文 前1條

1 李有兵;大直徑泥水平衡盾構(gòu)穿越上軟下硬地層的施工技術(shù)研究[D];西南交通大學(xué);2014年

，

本文編號：1403245