厦门翔安海底隧道浅滩透水砂层施工方案比较研究

Comparison Study on Shoal Permeable Sand Layers Construction plan of Xiamen Xiang'an Subsea Tunnel

厦门翔安隧道为跨海工程,翔安端主隧道顶部穿越强透水砾砂层,施工时极易产生涌水、透水事故,在隧道施工前必须对地下水进行有效的控制,并对砾砂层进行必要的加固处理。为确保隧道施工安全及控制工程造价,本文结合施工投标报价对地表高压旋喷注浆防护变更方案、防渗止水帷幕和设置疏干减压井变更方案进行了技术和经济的比较研究,研究结果推荐后者。

Xiamen Xiang＇an tunnel is a Subsea tunnel,and the tunnel crown of Xiang＇an side passes through a strongly permeable sand layer with high risk of water inflow during construction.Measurements to control the ground water and reinforce the sand layer should be carried out to reduce the risk.In order to guarantee the safety of tunnel construction and limit the cost,this paper carried out technical and economical comparison study between two proposed solutions, inwhich solution A is high pressure jet grouting from earth＇s surface and solution B is impermeable underground wall curtain combined with dewater wells, Finally the solution B is the reasonable one in result.