新填海场地轨道交通基坑位移突变原因分析及对策  

Cause Analysis and Countermeasures on Displacement Mutation of Rail Transit Foundation Pit in New Reclamation Site

作　　者：马驰 MA Chi(China Academy of Railway Sciences(Shenzhen)Research and Design Institute Co.Ltd.,Shenzhen Guangdong 518034,China)

机构地区：[1]铁科院(深圳)研究设计院有限公司,广东深圳518034

出　　处：《铁道建筑》2021年第4期97-100,共4页Railway Engineering

基　　金：中国铁道科学研究院集团有限公司基金(2018YJ168)。

摘　　要：以新填海场地一轨道交通深基坑工程为依托,通过分析锚索钻孔、注浆期间的基坑变形、锚索应力等观测资料,研究了围护桩位移突变的原因,提出了锚索跳二打一、套管跟进成孔、锚碇再张拉等施工改进措施。结果表明:锚索糊钻、锚碇预应力损失是造成围护桩位移突变的原因;本文提出的改进措施有效地控制了基坑变形。Based on the deep foundation pit engineering of rail transit in the new reclamation site,the deformation and stress of the foundation pit during the drilling and grouting of the anchor cable were analyzed.This paper studied the causes of displacement mutation of retaining pile,and put forward some construction improvement measures,such as jump of the anchor cable,the follow-up drilling of the casing,and the re-tensioning of the anchor.The results show that the displacement mutation of retaining pile is caused by the paste drilling of anchor cable and the loss of anchorage prestress.The improvement measures are proposed to effectively control the deformation of foundation pit.

关 键 词：新填海场地基坑 糊钻 现场试验 劈裂面 注浆压力 位移突变 

分 类 号：TU413[建筑科学—岩土工程]