盾构施工与邻近不同位置建筑物相互影响分析

在建筑物高度集中的城区，盾构施工会使周围一定范围内的既有建筑物受到影响。在考虑土体扰动的情况下，采用二维有限元方法，对邻近不同位置建筑物工况下的盾构隧道施工进行了模拟和分析。研究表明，建筑物的存在会增大隧道开挖引起的地面沉降和衬砌的受力与变形，同时隧道开挖也会使邻近建筑物产生附加应力和变形；当隧道轴线与建筑物中心线的水平距离与隧道外径之比L/D = 0.5～2时产生较大的地面沉降，建筑物的首尾沉降差较大，该区域内的建筑物比较危险；衬砌内力值也明显增大，在该区域以外对建筑物影响较小。

Analysis of interaction between shield tunnel construction and adjacent structure in different distance

In an area with dense and intensive buildings, the construction of shield tunnels will influence the subsiding of adjacent buildings. In view of soil disturbance, 2D FEM method is adopted in this paper to study and simulate the shield tunnel construction of adjacent structures. Our research indicates that surface settlement together with force and deformation of the lining increase by the existence of buildings, simultaneously, additional stress and deformation of adjacent structure are induced during tunnel excavation construction. L is defined as level distance from tunnel axis to building axis and D is defined as outer diameter of tunnel. When L/D = 0.5 to 2, great surface settlement is produced with more settlement difference between building head and tail, and the building is in danger in the region. At the same time, the value of inner force also increases obviously. Out of the region, the influnece on the buildings is ignored.