框架式复合初支在暗挖施工中的应用

Application of the Framework Composite-lining Structure on the Subsurface Construction

CRD工法暗挖大断面,马头门部位变形往往最大,需对结构体系进行补强,常见作法规纳有三:分别为施作二衬法、复合初支法、贴口环梁补强法。分析了以上三种方法的优缺点及适用性,提出了框架式复合初支的概念。基于地铁某车站,对采用框架式复合初支的暗挖结构进行了荷载-结构模型及地层模型有限元分析,从强度、变形及风险预测等方面论证了此种加强措施的可行性。

When the CRY） excavation method are used to tunneling large cross section, the horsehead-breaking of crosschannel is often the largest part of deformation, a reinforced structure of the architecture is required. There are three common practice inductions： to make Secondary-lining method, to make composite-lining method, to make reinforcement posted-beam method, this article analyzes the advantages and disadvantages of these three methods, and proposes the conception of the framework composite lining. Based on the Beihaibei Metro Station, using the load-structure model and the three-dimensional stratum model, from the strength, deformation, and risk prediction, this article demonstrates the feasibility of such strengthening measures.