岩土与地下工程 2024年 第53卷 第19期

DOI: 10. 7672 / sgjs2024190046

滨海深厚填石区超长大直径灌注桩施工技术研究

葛瑛芳¹,崔佳²,何华军²,张念³

作者简介：

葛瑛芳，高级工程师，E⁃mail: 3650163@ qq. com

作者单位：

1.浙江省水利水电工程质量与安全管理中心，浙江杭州 310012; 2.浙江广川工程咨询有限公司，浙江杭州 310020; 3.武汉长江科创科技发展有限公司，湖北武汉 430010

摘要：

填海造陆区常存在含量高、粒径大的深厚填石层，给长大直径灌注桩施工带来技术难题。某工程填石层厚17. 3m,采用桩径 1. 5m、最大桩长 88m 的灌注桩施工，经研究采用“冲击钻+旋挖钻”接力成孔技术及旋挖钻机填石层防卡钻装置。通过正交试验，确定泥浆调配关键原料配合比和 CMC 护壁泥浆最佳质量配合比。优选矿物掺合料、外加剂，确定了混凝土最优配合比，提高混凝土耐久性、工作性、保塑性。
桩基础；填海造陆区；填石层；成孔；正交试验；配合比

English：

There are often high⁃content, large⁃particle, deep⁃filled stone layers in the reclamation area,which brings technical problems to the construction of long and large⁃diameter bored piles. The fillingstone layer of a project has a thickness of 17. 3m, and the pile was constructed with a pile diameter of1. 5m and a maximum pile length of 88m. The “ impact drilling + rotary drilling” relay hole⁃formingtechnology and the anti⁃sticking device of the rotary drilling rig in the rock fill layer were adopted afterresearch. The key raw material mix ratio of mud blending and the optimal quality mix ratio of CMC wallprotection slurrywere determined through an orthogonal test. By optimizing the mineral admixtures, theoptimal mix ratio of concrete is determined to improve its durability,workability and plasticity.