复杂地层下地铁通道与合建物业地下室接口处基坑支护设计方案

Design of Retaining for Deep Foundation Excavation at the Interface between Subway Passageway and Basement under Complex Strata Condition

因地层条件特点,某地铁通道与合建物业地下室接口处基坑支护无法实施排桩或地下连续墙等常用围护结构,因此拟采用旋喷桩+内支撑形式,但旋喷桩在该地层下成桩效果较差,于是在旋喷桩位置外围设置止浆帷幕,处理效果良好,支护体系安全稳定。

According to the condition of strata,it is hard to apply piles or diaphragm on the retaining for deep foundation excavation at the interface between subway passageway and basement,and the scheme of using both rotary jet grouting pile and inner support would be worked out for the construction.In order to ensure the quality of rotary jet grouting piles,anti-grout curtain around rotary jet pile is adopted for treatment with good results and safety supporting system.