钻孔桩咬合深搅桩支护的技术研究

以南京地铁西延线区间隧道的深基坑工程为背景，对软土层条件下的钻孔桩咬合深搅桩的支护方法展开探讨和研究，着重阐述含水软土层中该围护型式的关键施工技术和监测结果，指出在设计围护结构插入深度时必须考虑抵抗渗流破坏的能力，同时安全的插入深度也是防止维护结构“踢脚”失稳的保证。

A Study on the Bored Pile Biting into Deep Mixing Pile

Based on the deep foundation pit project of tunnel in Nanjing metro west extending line, the supporting methods of the bored oile biting into deep mixing pile in soft soil are discussed. The key construction techniques and monitoring results for the supporting form in watered and soft soil bed are expounded,The ability of resisting seepage must be considered when insertion depth of supporting structure is designed,which may also prevent the skirting from losing its stability.