成都富水砂卵石地层盾构施工滞后沉降防控措施探讨

在成都富水砂卵石地层中采用盾构法施工尚属首次，为探讨解决盾构施工造成地层的滞后沉降引起的地表塌陷问题，通过对产生滞后沉降的原因进行分析，并结合工程施工经验，提出砂卵石地层滞后沉降的预防控制措施。工程实践证明：只要对滞后沉降给予足够认识和充分重视，并采取恰当措施，滞后沉降引起地表塌陷是完全能够减少甚至避免的。

Discussion on Prevention and Control of Delayed Settlement Induced by Shield Tunneling in Water-rich Sandy Cobble Stratum in Chengdu

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.