發(fā)布時(shí)間：2018-04-04 14:28

  本文選題：砂卵石　切入點(diǎn)：高水壓　出處：《巖土工程學(xué)報(bào)》2017年09期

【摘要】：以蘭州地鐵1號(hào)線一期工程世紀(jì)大道站—中間風(fēng)井區(qū)段為背景,綜合運(yùn)用現(xiàn)場(chǎng)調(diào)查與過(guò)程監(jiān)測(cè)、實(shí)驗(yàn)室模擬試驗(yàn)、三維數(shù)值模擬等方法與手段,對(duì)砂卵石地層高水壓條件下土壓平衡盾構(gòu)掘進(jìn)基于渣土改良的噴涌控制的可靠性進(jìn)行了研究。主要取得以下成果:(1)建立了砂卵石地層高水壓條件下盾構(gòu)掘進(jìn)改良渣土抗?jié)B性(噴涌控制)的定量試驗(yàn)?zāi)M與測(cè)試方法;(2)確定了單摻鈉基膨潤(rùn)土漿液改良渣土的膨潤(rùn)土漿液最優(yōu)濃度和摻加膨潤(rùn)土漿液的最優(yōu)體積比,并證明了其改良后的渣土的抗?jié)B性能具有較高的噴涌控制可靠性;(3)同時(shí)摻加鈉基膨潤(rùn)土漿液和泡沫改良渣土,泡沫的摻入體積比應(yīng)小于1∶5。研究結(jié)果有力地支撐了世紀(jì)大道站—中間風(fēng)井區(qū)段高水壓條件下,盾構(gòu)以-28‰的超大縱坡下坡掘進(jìn)過(guò)程的噴涌控制,規(guī)避了盾構(gòu)設(shè)備受淹風(fēng)險(xiǎn)。
[Abstract]:Based on the section of Shidao Station-Middle Air well of Lanzhou Metro Line 1, the methods and means of field investigation and process monitoring, laboratory simulation test, 3D numerical simulation and so on are used synthetically.In this paper, the reliability of jet control based on residual soil improvement in soil pressure balance shield tunneling under high water pressure in sandy pebbles is studied.The main achievements are as follows: (1) the quantitative test simulation and test method for the impermeability of improved residual soil in shield tunneling under high water pressure condition of sand pebble formation are established. The modified residue soil with single sodium base bentonite slurry is determined.The optimal concentration of bentonite slurry and the optimal volume ratio of bentonite slurry,It is also proved that the impermeability of the modified residual soil has a high speed-control reliability and the addition of sodium bentonite slurry and foamed modified residue should be less than 1: 5.The results of the study support the high water pressure condition in the section of Shidao station and middle wind well, and the shield tunneling process is controlled by -28 鈥，

本文編號(hào)：1710356