摘要
近年来，国内已经大量地将刚性CFG桩复合地基应用于20～30层的高层、超高层建筑中，复合地基承载力可以达到650kPa。刚性CFG桩优点是强度高、密实度好，而且这种优点随着其围压的增大而更加突出，为了充分发挥刚性CFG桩的这一优点，并使桩头或接近桩头段在高承载力的情况下不致破坏，采用CFG桩上部插筋增强，使CFG桩复合地基的整体水平抗剪、水平抗弯和竖向抗压能力得到明显提高，从而使得CFG桩复合地基在大型高层、超高层等建筑中得到更广泛的应用。本文通过光华国际世贸中心地基处理工程实例，详细介绍插筋增强型CFG桩复合地基新技术，该技术可以有效扩展现有刚性CFG桩应用范围，并可以成功应用到复合地基承载力特征值最高达到938kPa的建筑工程当中。
In recent years, rigid CFG pile composite subsoil treatment has been widely used in the high-rise or ultra high-rise buildings ranging from 20 to 30 storeys in height. Bearing capacity of composite subsoil can reach 650kPa. Characterized by its high strength and sound compaction, rigid CFG pile has much more prominent advantages with the incremental surrounding pressure. To fully assert the aforesaid advantages of rigid CFG pile, and to make sure pile tip or those pile shaft near the pile tip will not be damaged under the high bearing capacity, dowel bar is to be appropriately inserted for strengthening on the top section of the CFG pile. Consequently, the integral horizontal shear resistance, horizontal bending resistance and vertical compressive resistance capability of CFG pile composite subsoil are therefore greatly enhanced. Thus, the further widespread application of CFG pile t composite subsoil treatment in the large-sized high-rise and ultra high-rise buildings can become real. Based on one actual subsoil treatment project of Guanghua International World Trade Center, this paper introduces one kind of new technique dowel bar reinforced CFG pile composite subsoil treatment. This kind of technique can effectively extend the application scope of the prevailing rigid CFG pile. It can also be successfully applied to other similar building projects, in which the maximum characteristic value of bearing capacity of composite subsoil can reach 938kPa.
出处
《工程勘察》
CSCD
北大核心
2009年第2期13-18,共6页
Geotechnical Investigation & Surveying
关键词
插筋增强型CFG桩
刚性CFG桩
抗拔(浮)桩
高层建筑
dowel bar reinforced CFG pile
rigid CFG pile
pulling/floatation resistance pile
high-rise building
