Abstract:

Blasting excavation is not practical for ventilation shaft construction in complex urban condition. Thus, safely shaft excavation with high quality by nonblasting excavation technology, in narrow construction site and complex construction condition, is analyzed and introduced in this paper, based on the construction of Hongtudi and Huangnipang shaft and horizontal adit on No. 6 line (1st phase project) of Chongqing rail transit system. In addition, the construction technologies for installation of lift frame, shaft cutting by saw machine and muck discharging and horizontal adit excavation with hydromill and rock splitter are summarized in this paper and their merit and demerit are analyzed. This paper may provide references for similar projects construction in the future.

Key words: urban metro, complex geological condition, shaft, horizontal adit, nonblasting excavation