PCC能量桩桩身变形分布式测量及其桩土作用研究

The PCC energy pile technology is a new type of foundation reinforcement technology with independent intellectual property rights of Hohai University. The deformation characteristics and pile soilinteraction of PCC energy pile is very important for optimizing thedesign and construction of PCC energy pile. The new technology of BOTDA distributed optical fiber sensing technology for deformation and temperature fully finedistributed, long-term and real-time monitoring measurement of PCC energy pile is used in this program. The finite difference method isadopted based on the strain distribution of new pile body. A pile soil interactionnumerical analysis model of PCC energy pile is established, thedeformation characteristics of pile and pile soil interaction deformation of PCC energy pile is studied. The bearing mechanism of the new pile isanalyzed. Through this program, a distributed fiber construction techniques andmethods suitable for monitoring PCC energy pile are developed. Thebasic data of stress and strain distribution for PCC energy pile isprovided. It will bring new understanding for the deformation and pile soilinteraction of PCC energy pile. The study will provide scientifictheoretical and technical support to optimize the design, construction, marketing applications for PCC energy pile.

PCC能量桩是河海大学开发的一种具有自主知识产权的新型能量桩技术。了解和掌握PCC能量桩桩身变形特征和桩土作用对于PCC能量桩的优化设计和施工非常重要。本项目拟采用全新的BOTDA 分布式光纤传感测量技术对PCC能量桩桩身变形进行全分布、长期和实时监测，在获取该新型桩桩身应变和温度分布的基础上，采用有限差分法，建立PCC能量桩桩土作用数值分析模型，对PCC能量桩的桩身变形特征和桩土作用进行研究，深入分析该新型桩的承载机理。通过本项目的研究，研发出适合PCC能量桩的分布式光纤监测试验技术和方法；为PCC能量桩的桩身应力和应变分布更深入研究提供基础性数据；并对该新型桩桩身变形特征和桩土作用研究能够有新的认识。该项研究将为PCC能量桩的优化设计、施工、推广应用等提供科学的理论支撑和技术保障。

PCC能量桩作为岩土工程领域的一种新型节能桩基技术，具有单桩桩身承载力高、混凝土用料少、充分利用桩身内部空间实现建筑桩基内部上下热交换、高效节能环保等优势，具有极大的应用前景，研究PCC能量桩桩身变形规律与桩身-桩周土温度场分布规律等对于PCC能量桩的推广应用具有重要意义。项目采用先进的光纤传感监测技术，监测了PCC能量桩桩身变形，开展了光纤传感技术在PCC能量桩应用的相关基础性研究，提出了一种适合于能量桩的加载装置和光纤施工工艺，获取了PCC能量桩的桩身变形数据，开发了相关的光纤数据管理系统，并采用数值模拟方法，进一步对PCC能量桩桩身应变分布规律与桩身-桩周土温度场分布进行研究。