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隧道开挖施工引起地层的位移可能会引起附近建筑物或其他各类结构的变形,甚至造成灾害。运用三维有限元方法,采用变刚度等效法来模拟注浆材料的硬化,同时采用等效均布注浆压力来模拟盾尾同步注浆,计算分析了不同的盾构顶进力、盾尾注浆、千斤顶推力等施工参数下及不同的隧道交叉角度下,交叉隧道盾构施工对既有隧道沉降的影响。结果表明:注浆压力和注浆材料的硬化对既有隧道沉降产生直接影响;既有隧道沉降值随着盾构推进力和注浆层参数的增大而减小;盾构千斤顶推力变化引起的既有隧道沉降值大于正常推进时的沉降值;当隧道交叉角度小于90°时,既有隧道沉降随着交叉角度的减小而增大。
Displacement caused by tunnel excavation may cause deformation of nearby buildings or other types of structures and may even cause disasters. The three-dimensional finite element method is used to simulate the hardening of grouting material by using the method of variable stiffness equivalence, and the equivalent grouting pressure is used to simulate the synchronous grouting of shield tail. Different jacking forces are calculated and analyzed. Slurry, jacking thrust and other construction parameters and different tunnel crossing angles, the effect of cross tunnel shield construction on existing tunnel settlement. The results show that the grouting pressure and hardening of grouting material have a direct impact on the settlement of existing tunnels. The settlement value of existing tunnels decreases with the increase of shield propulsion and grouting parameters. The variation of thrust of shield jacks Of the existing tunnel settlement value is greater than normal when the settlement value; when the tunnel crossing angle is less than 90 °, the settlement of the existing tunnel with the intersection angle decreases.