南京地铁南京站～东井亭区间渡线段隧道施工技术

Construction of connecting tunnel between Nanjing station and Dongjngting in Nanjing metro

南京地铁一号线南京站～东井亭区间渡线段隧道为大跨变断面隧道 ,围岩破碎 ,自稳性差。因此 ,隧道施工前采用了高压旋喷桩加固地层 ,并采用了超前管棚支护以及双侧壁导洞、超短台阶、CRD等施工方法。

The connecting running tunnel between Nanjing Railway station and Dongjingting in Nanjing metro No.1 line has the characteristics in its large span, varying cross section, crushed and poor self-stability surrounding ground. The soil is reinforced by jet grouting before excavation, and the tunnel is supported by advanced pipe-roof protection. Furthermore the methods of double-side wall pilot tunnel, mini bench, CRD, etc, are adopted. Its construction technology and key process are mainly introduced in this paper.