微型桩复合土钉墙对狭小深基坑的应用分析

Application analysis of composite soil nailing wall with micro-piles to narrow and deep foundation pit

针对东黄山国际小镇工程沟槽深基坑支护具有支护空间狭小、砂卵石地层渗透性强、颗粒松散、边坡整体稳定性差的特点,提出运用微型桩、预应力锚杆、土钉墙组合的复合支护体系,阐述了支护设计及施工技术要点,该体系可承受较大水平作用力,变形小,支护空间节约,材料及设备要求低,安全环保,经济可行,对类似工程具有一定的借鉴意义。

Aiming at the deep foundation pit support of trench in Donghuangshan International Town Project withcharacteristics of narrow supporting space,strong permeability of sand and pebble stratum,loose granules and poor overall stability of slope,a composite supporting system composed of micro-pile,pre-stressed anchor and soil nailing wall is put forward,which expounds the key points of support design and construction technology.The system with large endurance of horizontal forces,small deformation,saving support space,low requirements for materials and equipment,safety and environmental protection,economic feasibility has a certain reference significance for similar projects.