珠江口铁路隧道排水系统设计研究

Study on drainage system design of deep buried tunnel of Pearl River Estuary Railway

对于施工工法复杂、结构渗水量大、无法自流排放的深埋海底隧道,排水系统设计方案的优劣对工程投资、建设及后期运营影响较大。目前国内类似工程经验、技术研究较少,设计标准不够完善。通过以珠江口铁路隧道为工程背景,对组合工法海底隧道的防排水原则和标准进行分析;根据“高水高排、低水低排”的原则,对组合工法铁路隧道排水系统进行研究;对工程中的重难点:盾构段与矿山段过渡区中心沟顺坡排水、海底泵房集水池容积的确定、泵房的永临结合等进行探讨。

For the deep buried subsea tunnel with complex construction method,large structural seepage and unable to discharge by gravity,the quality of the drainage system design scheme has a great impact on the project investment,construction and later operation.At present,there are few similar engineering experience and technical research in China,and the design standards are not perfect.Taking the Pearl River Estuary railway tunnel as the engineering background,this paper analyzes the waterproof and drainage principles and standards of combined construction subsea tunnel;According to the principle of high water and high discharge,low water and low discharge,the drainage system is designed and studied from three aspects;It also discusses the key and difficult points in the project:drainage along the slope of the central ditch in the transition section between shield section and mine section,determination of the volume of the sump of the subsea pump house,permanent and temporary combination of the pump house,etc.