铁路隧道跨越暗河处理

Treatment of railway tunnel crossing subsurface stream

田德铁路通过区域岩溶异常发育,其中百布隧道岩溶暗河形态复杂,设计坚持"维持地下水系不变"的原则,结合施工可行性,采用桥渡方案,通过荷载分担、异形断面设计、对结构最不利处变形的锚固约束等方法及施工中合理组织,克服了场地狭窄等问题,确保了工程的施工。

The area which the Tiande railway gets through is developed abnor- mally with karst, and the forms of underground karst river in Baibu tunnel are compli- cated. The design adheres to the principle of ＂ keeping the underground water system unchanged＂, and in combination with the construction feasibility, the bridge crossing scheme is adopted. Many problems like the narrow site etc. are overcome, and the project construction are ensured by adopting load sharing, special section design, anchoring and constraining of deformation at the most unfavorable position and reasona- ble organization during construction etc.