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传统钢锚杆虽然其强度和刚度较大,但其抗锈蚀能力差,尤其当其应用在一些腐蚀性严重的地区,以及地下水富集的软土地区,钢材锈蚀问题更加严重,对支护结构的安全性和耐久性带来严峻的挑战。GFRP锚杆具有质轻、高强、抗腐蚀、对电磁不敏感等诸多优良特性,逐渐被应用于实际工程加固中。本文采用有限差分软件FLAC3D,首先模拟GFRP锚杆的拉拔过程,并分析锚固长度及砂浆粘结强度对锚杆力学特性的影响;然后建立隧道模型,模拟其在隧道支护中的作用效果。研究结果表明:锚固长度及砂浆粘结强度对锚杆力学特性影响较大;GFRP锚杆在隧道支护中表现出较好的支护效果。
Although the strength and rigidity of the traditional steel anchor are high, its corrosion resistance is poor, especially when applied in some corrosive areas and soft soil areas rich in groundwater, the problem of steel corrosion is even more serious. For the supporting structure The safety and durability pose serious challenges. GFRP bolt possesses many excellent features such as light weight, high strength, corrosion resistance and insensitivity to electromagnetic and is gradually being applied in practical engineering reinforcement. In this paper, the finite difference software FLAC3D is used to simulate the drawing process of GFRP bolt. The influence of anchorage length and mortar bond strength on the mechanical properties of the bolt is analyzed. Then, the tunnel model is established to simulate its effect in tunnel support. The results show that: the anchorage length and the mortar bond strength have a great influence on the mechanical properties of the bolt; the GFRP bolt shows good supporting effect in the tunnel support.