下穿式盾构泥水压力对既有隧道的影响分析  

Analysis on the Behavior of Existing Tunnels due to Setting of Slurry Pressure in Slurry Shield

作　　者：李庭平[1,2] 沈水龙[1] 姜弘 

机构地区：[1]上海交通大学土木工程系,上海200240 [2]上海市城市建设设计研究院,上海200125

出　　处：《地下空间与工程学报》2009年第3期553-556,615,共5页Chinese Journal of Underground Space and Engineering

摘　　要：相互交叉的隧道近距离施工中,新建隧道施工必然会对既有隧道造成扰动,当盾构开挖面在既有隧道附近推进时,泥水盾构压力舱内泥水压力的变化会对既有隧道变形产生影响。采用三维有限元法,对泥水盾构在既有隧道下方推进时泥水压力与既有隧道变形的关系进行了研究。结果表明,既有隧道的沉降随着泥水压力的减小而逐渐增大,实际施工中,为减小此影响应将泥水压力比控制在0.8～1.0之内。When a new tunnel is constructed under/near existing tunnels, it will give disturbance to the existing tunnels. The setup of the slurry pressure in the slurry chamber becomes quite significant to the behavior of existing tunnels. In order to elucidate the mechanism of this effect, the three-dimensional finite element method is adopted to analyze the relationship between the slurry pressure and the deformation of existing tunnels and ground surface. The results indicated that the settlement of existing tunnels increased with the decrease of slurry pressure, and slurry pres- sure ratio should be kept within 0.8 to 1.0.

关 键 词：盾构隧道 开挖面 泥水压力 有限元法 

分 类 号：U45[建筑科学—桥梁与隧道工程]