TRD与围护桩支护结构在基坑工程中的应用

Application of TRD and New Supporting Structure of the Enclosing Piles in Foundation Pit Engineering

以武汉复地超大深基坑工程为依托,提出一种TRD与围护桩代替地下连续墙的新型支护结构;采用双排桩+TRD与内支撑外加被动区土体加固的支护方式,TRD兼做止水帷幕;选取支护结构BC段为例,计算双排桩的嵌固深度,用天汉软件计算了支护结构的内力,并验算基坑抗隆起稳定性,计算结果显示满足稳定性要求。

Based on the large foundation pit in Wuhan Forte,this paper presents a new supporting structure in which TRD and enclosing piles replace the underground diaphragm wall.It uses the support pattern of double-row piles,TRD,internal support,soil consolidation at passive zone,and TRD functions as waterproof curtain.Taking the supporting structure in the BC section as an example,the built-in depth of double-row piles is calculated.By means of Tianhan Software,the internal force of supporting structure is also figured out.Furthermore,the stability against upheaval of the foundation pit is checked.The calculated results shows that this new supporting structure can meet the stability requirement of foundation pit.