盾构隧道下穿影响下地下商业街变形规律及安全评价

Deformation Rule and Safety Evaluation of Underground Commercial Street Caused by Shield Construction

以武汉地铁六号线武胜路站至汉正街站区间盾构工程为依托,采用FLAC3D有限差分软件对双线非平行盾构隧道进行分步施工模拟,分析了地下商业街底板在双线盾构影响下的横断面、纵断面的变形规律。提出底板沉降在各典型施工工况下的曲线形式,并对比现场监测数据及其不同的拟合形式,表明数值模拟结果和工程实际情况比较吻合,能够反映盾构施工各典型工况下的底板变形特征。考虑箱形基础的侧墙位移、底板的平均沉降量和局部倾斜等因素,应用建筑基础安全性评价方法得出地下商业街在双线盾构影响下是能够被安全使用的。

On the basis of Wuhan Metro Line interval shield project from Wusheng station to Hanzhengjie station,finite difference software FLAC3 D is applied to simulate the staged construction of non-parallel double shield tunnel,the deformation characteristics of the underground commercial street in the double bottom cross-section shield impact is analyzed,the deformation of the profile and floor deformation characteristics under the influence of a single line is put forward. With the comparison of site monitoring data and its various curve fitting forms,the form of floor settlement curve in typical operating construction conditions is raised,the conclusion is obtained that numerical results is in agreement with the real condition,which can reflect the deformation characteristics of the floor in various shield construction conditions. Considering about the factors of the box-shaped foundation that include wall displacement,the average settlement backplane and local dip,the evaluation method of building foundation gets the results that underground commercial street is safe under the influence of shield wire.