盾构近距离穿越相邻隧道施工的数值解析

近距离穿越施工时盾构对周围地层位移场的影响明显不同于常规施工.结合上海地铁隧道近距离穿越工程实例,运用边界单元法模拟分析了掘进施工过程中盾构对已建建筑的影响,同时对施工参数进行了理论探讨.结果表明,盾构壳体是影响周围地层的主要因素,而且其影响具有滞后性和累积特性,在施工中需要超前控制.

Numerical analysis of shield tunneling construction through adjacent objects

Impact of shield tunneling boosting on the surrounding ground during adjacent construction is obviously different from that of the normal construction. By making use of boundary element method, the effect of shield tunneling on the existing structures is investigated; and also the construction parameters are discussed based on the practice of subway engineering of adjacent construction in Shanghai. It is shown that the shield shell is the main influential factor on the surrounding ground and the adjacent existing structure; and its impaction has hysteresis and accumulative characteristic, which must be controlled in advance during the construction period.