海上风电斜桩基础复杂地基加固技术及应用  

Reinforcement technology and application of complex foundation for offshore wind power inclined pile foundation

作　　者：罗承浩 LUO Cheng-hao(Geotechnical and Environmental Enterprise Engineering Technology Research Center ofFujian Province/Fujian Yonking Geotechnical Co.,Ltd.,Longyan 364000,Fujian,China)

机构地区：[1]福建省岩土与环境企业工程技术研究中心/福建永强岩土股份有限公司,福建龙岩364000

出　　处：《地基处理》2022年第6期507-513,536,共8页Journal of Ground Improvement

基　　金：福建省科技计划项目(2021H4024);福建省科技计划项目(2020I1011)。

摘　　要：桩基础是目前海上风电广泛使用的一种基础型式。在砂层、残积土、砂土状强风化花岗岩等复杂地层条件下,海上风电桩基础施工易导致土层塌陷涌堵钻孔,从而阻碍桩基后续成桩施工,并降低桩基侧摩阻力。目前针对海洋地基处理技术方面的研究很少,应用案例更鲜有报道。本文结合海上风电工程实例,根据斜桩基础情况,开发桩内及桩外斜向导向定位装置,并在此基础上研发海上斜孔静压注浆及高压斜向旋喷注浆相结合的新型复合注浆加固技术,充分发挥静压注浆扩散范围大、高压旋喷注浆范围可控且强度高的优点,各技术手段时序有机结合运用,优化设计出最有效合理的加固方案,确保斜桩基础周围的松散塌陷地基区域无空白加固并达到最佳的加固效果。通过现场钻孔取芯及室内抗压强度试验等多种手段检测,说明海上斜向复合注浆加固技术工艺先进、效果良好,具有重要的社会效益及推广应用价值,对其它类似工程具有很好的参考借鉴意义。At present, pile foundation is a type of foundation widely used in offshore wind power. Under complex ground conditions such as sand layer, residual soil, and sandy soil-like strongly weathered granite, the construction of offshore wind power pile foundation may easily lead to soil collapse and surge blocking of drilling holes, thus hindering the subsequent pile forming construction of pile foundation and reducing the side friction of pile foundation. There are few studies on marine foundation treatment technology, and fewer application cases are reported. Combining with the example of offshore wind power engineering, the oblique guiding and positioning device inside and outside the pile was developed in inclined pile foundation. On this basis, a new composite grouting reinforcement technology including offshore inclined hole static pressure grouting and inclined high-pressure rotary jet grouting was proposed to take the advantages of large diffusion range of static pressure grouting and controllable range and high strength of high-pressure rotary jet grouting. Various technical means were integrated in sequence. And the most effective and reasonable reinforcement scheme was optimized to ensure that there was no blank area in the loose sand around the inclined pile foundation and achieves the best reinforcement effect. Through on-site drilling and coring, indoor compressive test and other detection methods, it shows that the offshore oblique composite grouting reinforcement technology is an advanced technology, and has important social benefits and application value. It provides a good reference for other similar projects.

关 键 词：海上风电 斜桩基础 复杂地基 斜孔静压注浆 高压斜向旋喷注浆 海上斜向复合注浆 

分 类 号：TU472[建筑科学—结构工程]