吊脚桩基坑支护设计——以山东临沂市中汇大厦基坑为例

二元岩土结构的基坑支护常采用吊脚桩+锚索支护结构,在岩肩宽度不足条件下,合理确定等效锁脚锚索锚固力是最关键的因素。数值法分析计算锚固力虽然可行,但不是一般工程技术人员易于掌握的。以山东临沂市中汇大厦基坑为例,通过对土反力合力、支护桩弯矩沿嵌固深度的轨迹来确定锚固力,方法易行,结果可靠,计算的锁脚锚索锚固力大小确定,没有人工干预造成的不确定性,对吊脚桩支护设计具用实用性。

Foundation pit support design with end-suspended pile: Taking the foundation pit of Zhonghui Building in Linyi City, Shandong Province as an example

The retaining structure of the foundation pit of the binary rock and soil structure is usually the anchor cable with end-suspended pile supporting structure, especially when the width of the shoulder is not enough, it is the most important factor to determine the anchor force of equivalent lock-foot cable reasonably. Take the foundation pit of Zhonghui Building in Linyi City, Shandong Province as an example, although the numerical method is feasible to analyze and calculate the anchorage force, it is not easy to be mastered by ordinary engineers and technicians.The anchorage force is determined by the resultant force of soil reaction and the track of bending moment along the embedded depth of the supporting pile. The method is easy to use and the result is reliable. The anchorage force of the anchor cable of the calculated anchor cable is determined without the uncertainty caused by manual intervention, which is practical for the supporting design of the hanging pile.