玻璃纤维筋桩体在盾构始发与接收中的应用研究

Study on Ground Settlement and GFRP Reinforcement Deformation of Shield Barrier-Free Launching and Receiving

盾构始发与盾构接收端采用玻璃纤维(GFRP)筋桩作为围护结构的技术目前已在国内外得到广泛应用,但在工程实践中发现接收端的GFRP筋桩体存在变形过大等现象。为了解决这一安全隐患,对比分析了二者始发与接收的施工工艺特点,采用三维数值模拟方法分析了二者地表沉降、GFRP筋桩体变形规律及差异性。研究结果表明:在盾构接收施工中GFRP筋桩体受力复杂,施工难度高,风险因素多,盾构推力的控制极为关键;相比始发阶段,接收阶段的GFRP筋桩体需要具有更高的抗弯和抗剪承载力以保证洞口稳定性。本文研究成果对于同类工程的围护结构设计具有一定的参考价值。

At present, the technology of using GFRP reinforced pile as enclosure structure at the launching and receiving ends of shield has been widely used at home and abroad. However, excessive deformation has been found at the receiving end of the GFRP reinforced pile. In order to solve this potential safety hazard, the construction technology properties of the launching and receiving ends are compared and analyzed, and three-dimensional numerical simulation method is used to analyze the ground settlement, GFRP reinforced pile deformation law and differences. The research results show that the GFRP reinforced pile has complex stress, high construction difficulty and many risk factors, and the control of shield thrust is very critical;Compared with the launching stage, the GFRP reinforced piles in the receiving stage need to pocess higher flexural and shear bearing capacity to ensure the stability of the opening, which has a certain reference value for the envelope design of similar projects.