Abstract:

The various utility lines in urban areas, especially the gap pipelines, have great influence on the construction safety and construction schedule of the Metro tunnels. The measures taken to protect the utility lines during the shallowcovered mining construction of ShangmeilinMinle section of phase II project of line 4 of Shenzhen Metro are presented, with the focus being placed on the advance large pipe roof, soletanche grouting and soil releasing. In the end, the settlement of the utility lines is effectively controlled, the safety of the utility lines is ensured and the successful construction of the project is guaranteed.

Key words: tunnel under shallow cover, protection technology, gas pipeline, ground surface settlement, advance large pipe roof, soletanche grouting, soil releasing