海堤侧吹填区真空联合堆载预压法加固技术

Consolidation technology of vacuum preloading combined with surcharge preloading for seawall-side hydraulic reclamation area

针对靠海堤侧吹填区淤泥面下方为抛石海堤的不规则斜坡面的情况:1)常规打设排水板进行真空联合堆载预压的工艺,因通过海堤石料空隙与外海连通,无法达到真空效果;2)直接由海堤侧堆载易造成泥面向内侧的滑移的问题。本文对压膜沟压膜工艺、堆载方法、临堤排水板设备进行了研究,采用平移压膜沟、多点均匀堆载、设备的端部加设钢钎、浅层区域进行置换、持续优化方案等方法,解决了此类条件下真空联合堆载预压真空度难维持、泥面易滑移的难题,结果表明采取的方案安全可靠、便于施工,为类似工程提供了参考。

When the irregular slope surface of a riprap seawall lies below the sludge surface of a seawall-side hydraulic reclamation area, the following problems deserve further discussion: 1)The conventional process of vacuum preloading combined with surcharge preloading featuring drainage plate installation fails to achieve a vacuum effect due to connection with the open sea by the gaps among seawall stones. 2)Surcharge loading directly from the seawall side is highly likely to cause the sliding of the mud surface to the inside. This paper focuses on the film-pressing process of the film-pressing ditch, surcharge loading methods, and drainage plate equipment near the seawall. It solves the problems, namely, difficult maintenance of a vacuum effect and easy sliding of the mud surface, in vacuum preloading combined with surcharge preloading under the abovementioned conditions by translation of the film-pressing ditch, multi-point uniform surcharge loading, the addition of drilling steel at the end of the equipment, replacement in the shallow area, and continuous scheme optimization. The results show that the scheme adopted is safe, reliable, and convenient for construction, and it provides a reference for similar projects.