平行隧道穿越形式对砌体建筑变形的影响研究

为确保盾构隧道修建过程中上方建筑物的安全，基于天津地铁3号线和平路站至津湾广场站区间平行盾构穿越3座砌体建筑物的全过程现场监测结果，结合流固耦合数值模拟，分析双线平行盾构隧道以先行隧道下穿、后行隧道侧穿和先行隧道侧穿、后行隧道下穿2种不同的穿越形式掘进通过砌体建筑物时，建筑物的沉降与倾斜规律。研究结果表明： 1）双线平行盾构隧道先下穿后侧穿时可对建筑物下伏地层产生二次损伤，这种穿越形式会加重影响与隧道走向呈小角度斜交的砌体建筑物的沉降与倾斜率，使其墙体的沉降曲线分布趋于“单斜状”，墙体的倾斜率为先侧穿后下穿时的2倍； 2）2种穿越形式对与隧道走向呈大角度斜交的砌体建筑物的沉降与倾斜率影响不大。

Study of Influence of Crossing Mode of Parallel Tunnels on Deformation of Masonry Buildings

When tunnels cross underneath buildings, the safety of the buildings should be guaranteed. The site monitoring is carried out for parallel shield tunnels of Heping Road Station Jinwan Square Station on Tianjin Metro Line No. 3 crossing underneath 3 masonry buildings; and the settlement and inclination of the buildings are analyzed when adopting 2 crossing modes, i.e. former tunnel underneath crossing + latter tunnel laterally crossing and former tunnel laterally crossing + latter tunnel underneath crossing, by fluid solid coupling simulation method. The research results shows that: (1) When adopting the crossing mode of former tunnel underneath crossing + latter tunnel laterally crossing, the settlement and inclination of the buildings would be increased, the settlement curve of the building wall shows approximately as a oblique line, and the inclination of the building wall is two times that when adopting the crossing mode of former tunnel laterally crossing + latter tunnel underneath crossing. (2) The tunnels with the 2 crossing modes mentioned above affect the settlement and inclination of the building with large oblique crossing angle little.