Abstract:

It is the first time that shield tunneling method has been used in the waterrich sandy cobble stratum in Chengdu. In order to solve the problem of ground surface collapse induced by delayed settlement, prevention and control measures for the delayed settlement in sandy cobble stratum are proposed on basis of analysis on the cause for the delayed settlement and construction experience. The engineering practices indicate that the ground surface collapse induced by the delayed settlement can be reduced or even avoided, provided that full understanding and enough attention are paid to the delayed settlement and appropriate measures are taken.

Key words: waterrich sandy cobble stratum, shield tunneling, delayed settlement, prevention and control measure