浅埋暗挖洞桩(柱)逆作法设计关键技术分析

Analysis on key design technology of Pilot-tunnel & Pile (Column) top-down method

通过对浅埋暗挖洞桩(柱)逆作法的深入剖析,针对其特点,论述洞桩(柱)法结构关键受力构件的设计技术要点,包括边桩、钢管混凝土中间立柱、中间桩基础、条形基础等构件的承载力、变形及稳定性分析,给出提高土体开挖稳定性和地基承载力的措施,以及采用该工法建造地铁车站时合理埋深的确定原则等。

Basic on further analysis on the characteristics of the Pilot-tunnel ＆ Pile（Column） top-down method, key design technology points were discussed on the bearing capacity, deformation and stability of the main forced components which include the side pries, the middle concrete filled steel tubular piles, the middle pile foundation, the bar foundation, etc.. Some measures for improving the soil stability during the construction and the bearing capacity of soil foundation are presented. Moreover, the principle of the rational buried depth for metro station built by the Priot-tunnel ＆ Pile（Columa） top-down method is suggested.