Abstract:

During the arriving of the shield of Anqing Yangtze River Crossing Tunnel on the gas transmission pipeline from Sichuan Province to East China, countermeasures such as sand backfilling and water filling are taken so as to simulate shield boring under rivers and satisfactory effect has been achieved. The shield arriving technology applied in the project is presented in the paper. The technology is applicable to cases such as poor geological conditions of shield arriving shaft, huge covers, poor reinforcement of the strata and water/sand inflows that can not be coped with by grouting. The paper can provide reference for similar works in the future.

Key words: shield, sand backfilling, water filling, simulation of boring under river