采用盖挖逆作法施工的深基坑支护变形计算

Calculation Method Especially for Deep Excavation UsingTop-downMethod

鉴于城市地铁建设中对于安全性的特殊要求 ,许多地铁站采用盖挖逆作法施工 ,由于施工中的支撑为永久支撑 ,常常为整块的厚板 ,有较高的抗压刚度和不可忽视的抗弯刚度 ,与传统方法中简化为二力杆的临时支撑有很大的不同。在传统弹性地基梁法的基础上发展完善 ,使之更全面的考虑基坑的施工过程和支撑的性质 ,不失为一种好的计算方法。

Regarding the requirement of safety, a lot of subway-station adopt the top-down methodin construction in which the support structure has high flexural rigidity and stiffness. Because the traditional design method neglect the flexural rigidity, so this articlemodifies the traditional elastic beam method to simulate theconstructionprocess of deep excavation and the characteristicsof support structure.