含深厚冲洪积软土深基坑开挖工程的支护结构选型分析

Selection and analysis of supporting structure for excavation of deep foundation pit located in deep alluvial and diluvial soft soil

为满足龙海含深厚软土深基坑开挖工程的安全性要求,设计了SMW工法桩+预应力扩孔锚索结合被动区和主动区加固的基坑支护方案。工程实例表明,通过原位试验获取的土层设计指标,采用参数复合法验算加固土体的被动区和主动区的抗剪强度参数,表明桩锚支护形式是可行的。此方案在保证基坑安全的同时,还具有施工灵活,工期缩短的优势。

In order to meet the safety requirements of deep foundation pit excavation project with deep soft soil located in Longhai, the foundation pit supporting scheme of SMW engineering pile and prestressed reaming anchor combined with reinforcement of active zone and passive zone was designed.The engineering example shows that the pile and anchor support is feasible for the soil layer design index obtained by in-situ test and the shear strength index obtained by parameter compound method for the soil in passive and active areas. This scheme not only ensures the safety of foundation pit, but also has the advantage of flexible construction and shortened construction period.