凤城国贸工程超深基坑桩锚支护设计与施工

Design and construction of the ultra-deep foundation pile-anchorsupporting in Fengcheng International Trade Project

摘要:

桩锚支护结构体系是将护坡桩与土层锚杆相结合的一种支护方法,安全经济的特点使它广泛应用于边坡和深基坑支护工程中，但在超深基坑中的应用仍在探索中。在凤城国贸超深基坑工程中，根椐场地的工程地质条件、水文地质条件，充分考虑到周边条件，通过分析论证不同的基坑支护方案，选择技术上可行、经济上合理、整体性能好、同时便于基坑支护开挖及后续施工的桩锚支护体系。然后对基坑支护结构进行了土压力计算、灌注桩设计、锚杆设计、稳定性的验算，并通过后期变形观测，验证桩锚支护型式对于此超深基坑是安全经济适用可行的。

Abstract:

The pile-anchor supporting structure system is a supporting method which combines slope protection piles with soil anchor bolts. It is widely used in slope and deep foundation pit support due to its safety and economic characteristics. However, its application in ultra-deep foundation pits is still under exploration. According to the engineering geological conditions and hydrogeological conditions at the foundation pit of Fengcheng International Trade Project, taking into account of its surrounding conditions, and with comparison of several different foundation pit support plans, the pile-anchor supporting system was selected, which is technically feasible, economically reasonable, provides good overall performance and is convenient for the excavation of foundation pits and subsequent construction. Then the soil pressure calculation, cast-in-place pile design, anchor bolt design and stability checking calculation were carried out for the foundation pit supporting structure. Later deformation monitoring verified that the pile-anchor support was safe, economical and feasible for the ultra-deep foundation pit.