大型超深基坑工程信息化施工研究——上海外环隧道的浦西基坑工程

上海外环隧道的浦西基坑工程是一个开口型基坑,深达30m和不等深度,宽43m。本文对墙后地面沉降和墙顶沉降以及墙体水平位移进行研究,采用综合分析方法(包括系统的现场监测,超明星非线形空间软件和多种预测方法的跟踪计算),紧密结合现场的实际情况,按实际施工工况,有针对性地跟踪预测,提前两周提供分析结果,以期更好地指导施工。实践表明,运用综合分析方法是十分有效的。对土压力进行了实测与分析,结合变形分析对墙体工作性状的变化进行监视,并建议了一个实用的计算主动区土压力图式。最后,对信息化施工提出几点理性认识。

A study on IT construction for specially big & deep excavation engineering -Deep excavation engineering of Outer Ring Tunnel Project in Puxi, Shanghai

The deep excavation engineering of Outer Ring Tunnel Project in Puxi,Shanghai,is an open type one in plane with depth of 30 m and width of 43 m.This paper deals with the field study of deformation behind retaining wall,on top of wall and inside the wall.A synthetic method,including the systematic field monitoring,the application of SUPER Star software of space non linear design theory for deep excavation engineering and several prediction methods,is used to obtain the data of deformation in advance of two weeks for guiding construction at each stage.Engineering practice in this project has shown that the adoption of IT construction is successful and the rich data accumulated is valuable.The earth pressure is also studied to monitor the variation of behavior.A practical scheme for computation of active earth pressure is suggested.Finally,some important theoretic understandings for IT construction are proposed in this paper.