侵蚀环境下预应力GFRP锚杆结构的应力松弛模型

项目名称： 侵蚀环境下预应力GFRP锚杆结构的应力松弛模型

项目编号： No.41472240

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 地质学

项目作者： 李国维

作者单位： 河海大学

项目金额： 95万元

中文摘要： 钢筋锚杆锈蚀构成了边坡锚固结构的安全隐患。玻璃纤维增强聚合物（GFRP）筋抗拉强度大、模量低、耐腐蚀性强、性价比高，预应力GFRP锚杆有利于发挥材料的优势，成为解决途径之一。国际国内已有GFRP锚杆加固的临时性工程，而用于永久性锚杆结构的依据还不充分。本项研究基于均质材料的蠕变理论模型，根据复合材料属性和不同尺寸、荷载、温度和侵蚀条件的GFRP筋蠕变实验，建立多因素影响的GFRP筋和GFRP筋锚固系统的蠕变模型；根据不同尺寸、荷载、温度和侵蚀条件的GFRP筋锚杆结构应力松弛实验，建立多因素影响的GFRP筋胶结体的应力松弛模型；综合GFRP筋及其锚固系统的蠕变模型和GFRP筋胶结体的应力松弛模型，最终形成有侵蚀、荷载、温度、尺寸影响的GFRP筋锚杆结构的应力松弛模型。研究成果对GFRP筋锚杆在边坡加固工程中的科学应用有重要意义。

中文关键词： 边坡工程；预应力锚杆；耐久性；玻璃纤维增强聚合物；物理模型试验

英文摘要： It is well recognized that corrosion of steel soil nail is a significant threat to the safety of reinforcement slope structure, and a lot of efforts have been made by researchers all over the world to find substitutes to the steel in harsh environment. The glass fiber reinforced polymer (GFRP) bar, because of its high tensile strength and low modulus, is found ideal to work as pre-stressed anchor. Together with its good corrosion resistance and reasonable cost, GFRP bar has become one of the optimum alternatives to the steel anchor, and there are already attempts of using GFRP bars as anchors in temporary projects both in China and abroad. However, there are still very limited studies on the application of GFRP bar to the permanent anchorage structure. In this study, lab creep tests on the GFRP bars and GFRP grip system are carried out with different dimension, loading, temperature and corrosion conditions. Based on the testing results and the theoretical creep model of homogeneous materials, the creep models for GFRP bars and GFRP grip system with different influence factors will be developed. In addition, the GFRP soil nail element will be subjected to the stress relaxation tests under different conditions in dimension, loading, temperature and corrosion, and the stress relaxation model for the bond system of GFRP soil nail element will be established according to the testing results. Finally, the stress relaxation model for the whole GFRP soil nail element structures with different affecting factors will be built by combining the creep models for GFRP bars and GFRP grip system and the stress relaxation model for the bond system of GFRP soil nail element. This study will make major progress to the understanding of long-term properties of GFRP soil nail anchored structures.

英文关键词： slope engineering;pre-stressed soil nail;durability;glass fibre reinforced polymer;physical model test