不同泥漿滲透模式下形成泥膜的閉氣效果探討
發(fā)布時間：2019-06-15 13:29
【摘要】：文章針對泥水盾構帶壓開艙時開挖面泥膜的閉氣性問題,以南京緯三路過江通道穿越的砂卵石地層為實驗地層,通過自行研制的泥膜氣密性裝置,開展了不同泥漿滲透模式下形成泥膜的閉氣試驗。結果表明:泥漿向地層中滲透時,部分泥漿顆粒堵塞在地層的孔隙中,有效地降低了地層的滲透性;先以密度為1.05~1.07 g/cm3的純膨潤土泥漿向地層中滲透,再以密度為1.15 g/cm3以上的稠泥漿形成泥膜,比只以較稠的泥漿形成單純的泥皮型泥膜的閉氣時間長數(shù)倍以上。該研究對泥水盾構在高滲透性地層中帶壓開艙時的泥漿調(diào)整和泥膜方案具有重要的參考意義。
[Abstract]:In order to solve the problem of closed gas of mud film in dredging surface of mud-water shield with pressure opening, taking the sand and pebble strata passing through the third channel of weft in Nanjing as experimental strata, and through the self-developed mud film air tightness device, the closed gas test of mud film formed under different mud permeability modes is carried out. The results show that when the mud permeates into the formation, some mud particles are blocked in the pores of the formation, which effectively reduces the permeability of the formation. First, the pure bentonite mud with density of 1.05 鈮，
本文編號：2500244
[Abstract]:In order to solve the problem of closed gas of mud film in dredging surface of mud-water shield with pressure opening, taking the sand and pebble strata passing through the third channel of weft in Nanjing as experimental strata, and through the self-developed mud film air tightness device, the closed gas test of mud film formed under different mud permeability modes is carried out. The results show that when the mud permeates into the formation, some mud particles are blocked in the pores of the formation, which effectively reduces the permeability of the formation. First, the pure bentonite mud with density of 1.05 鈮，
本文編號：2500244
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