抛石地基中不透水连海构筑物设计技术

Design technology of impervious sea-linking structures in riprap foundation

为维护海域海岛自然生态环境,常需要在围堤上建设连海构筑物。连海构筑物的建设往往受到地质、周边复杂环境等条件的影响和限制,导致结构选型困难、防渗止水不易等技术难题。以舟山绿色石化基地用海用岛整治工程为例,针对抛石地基和用海环境受限的复杂条件,开展构筑物结构选型、止水防渗、结构计算、施工工艺等关键技术研究,提出冲孔塑性混凝土桩防渗的现浇空箱结构方案和抛石堤上高压旋喷桩止水临时围堰施工方案,较好地解决了相关技术难题,可为类似工程提供参考。

To maintain the natural ecological environment of the seas and islands,it is necessary to build a sea-linking structure on the dike.However,the construction of the structure is often affected and restricted by the geological and surrounding complex environmental conditions,leading to technical problems such as difficulties in structure selection and seepage prevention.Taking the remediation project of a sea island for the green petrochemical base in Zhoushan as an example,we study key technologies including structure selection,seepage prevention,structural calculation,and construction technology aiming at the complex conditions of the riprap foundation and the restricted sea environment,and propose an empty box structure plan for seepage prevention of punched plastic concrete piles and a construction plan for a temporary water-stop cofferdam with high-pressure jet grouting piles on a rock dump,which better solves related technical problems and may serve as reference for similar projects.