输水隧洞粘贴碳纤维布加固效用的有限元分析

Finite Element Analysis of Reinforcement Effects of Carbon Fiber Reinforced Polymer in Water Conveyance Tunnel

因碳纤维布具有抗拉强度高和耐久性能强等特点,粘贴碳纤维布进行输水隧洞的补强加固是一种逐步推广应用的有效方法,具有高强高效、施工便捷、运输方便、耐腐蚀、自重轻等优势。以深圳市东江水源工程沙湾隧洞为例,以三维有限元作为计算分析工具,论证碳纤维布在输水隧洞加固中的应用成效。计算分析表明:碳纤维布加固能够改善衬砌混凝土的应力状态,对隧洞衬砌结构的稳定起到了一定的作用;碳纤维布参与承担运行期后续增大的外水压力等荷载后,能够明显的改善衬砌混凝土的受力状态,并能抑制衬砌混凝土进一步开裂。

With the characteristics of high tensile strength and strong durability, the carbon fiber reinforced polymer （CFRP） pasted in the water conveyance tunnels has become an effective and gradually adopted reinforcement method. It is of various advantages such as high strength and efficiency, construction and transportation convenience, corrosion resistance, and light weight. Based on a practical example, the Shawan tunnel of Dongjiang water source project in Shenzhen city, a three-dimensional finite element analysis is carried out to verify the reinforcement effects of pasting CFRP in water conveyance tunnels. The results show that CFRP reinforcement can improve the stress state of the lining concrete and plays a certain role for the stability of the tunnel lining structure. In the operation period, CFRP can significantly improve the stress state of the lining concrete by bearing the further increased external water pressure and prevent the development of cracks in the lining concrete.