Abstract: The conventional supporting system in the deep excavation for municipal projects in Wuhan is using the castinplace reinforced concrete pile with internal support or soil mixing wall (SMW) with internal support. Both methods usually lead to a high cost and long construction period. And the natural recharge and seepage path of the groundwater will be adversely affected. If the combined steel sheet piles with internal supporting are used, it is technically feasible and have merits to both cost and construction schedule. The combined steel sheet piles system can be completely recycled without affecting on the seepage path or natural recharge after the construction.

Key words: Combined Steel Sheet Pile, Municipal Deep Excavations, Technology and Economics