摘要
玻璃纤维增强聚合物(GFRP)锚杆是一种由树脂和玻璃纤维复合而成的新型加固材料,具有良好的力学性能和耐腐蚀性能。通过拉伸条件下的强度、蠕变和温度试验,测试GFRP锚杆材料的抗拉、蠕变特征和温度效应,验证GFRP材料用于永久性加固的可行性。采用的GFRP锚杆为脆断性材料,弹性模量约40GPa,屈服强度为400MPa。在工作温度范围内,使用荷载条件下的GFRP锚杆材料的热稳定性与HRB335钢筋相当。在锚杆设计荷载作用下,GFRP筋未产生持续的蠕变变形。粤赣高速公路K3+728～904右侧边坡部分采用GFRP锚杆框架梁加固结构,作为永久性工程使用。通过现场观测GFRP锚杆的应力、加固边坡的坡面变形和坡体整体位移,验证GFRP锚杆作为永久性加固结构的可靠性。观测数据表明,GFRP锚杆的应力变化与加固坡体的荷载变化规律一致;在荷载的长期作用下,没有出现应力松弛现象,具有继续承担附加荷载的能力;由于弹性模量不同,GFRP锚杆的应力分布特征不同于钢筋锚杆,适宜于加固风化较严重的岩坡或类土质坡。
Glass fiber reinforced polymer（GFRP） anchor is a new composite reinforcement material composed of resin and glass fiber;and it has good corrosion resistance and mechanical properties. The tensile,creep behaviors and temperature effect of GFRP were measured in laboratory by strength test,temperature test and creep test. According to test data,the feasibility of GFRP applied to permanent reinforcement engineering is discussed. The tests show that the GFRP anchor is brittle material whose elastic modulus is approximately 40 GPa and yield strength can reach to 400 MPa. The thermal stability of GFRP is similar to HRB335 steel applied to engineering within working temperature range and under working load conditions. GFRP can not take place sustained creep deformations under design load for anchor. Guangdong—Jiangxi highway K3＋728–904 right slope reinforcement adopted GFRP anchor frame beam structure as permanent reinforcement engineering. Through in-situ monitoring of GFRP anchor stress,deformation of reinforced slope and whole displacement,the reliability of permanent GFRP anchor reinforcement structure is discussed. The monitoring data show that the stress variation of GFRP anchor corresponds with the loading variation of slope reinforced by GFRP anchor;There is no stress relaxation under the long-term effect of loads,and GFRP anchor could still undertake some additional loads;Its stress distribution of GFRP anchors is different from that of steel anchors because of the difference in elastic moduli,and GFRP anchor is more suitable to soil slope reinforcement which usually has larger deformation than rock slope.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2010年第A02期4056-4062,共7页
Chinese Journal of Rock Mechanics and Engineering
基金
广东省交通科技项目(2004017)
广东省教育部科技部产学研项目(2009B09060011)
关键词
边坡工程
玻璃纤维聚合物
GFRP锚杆
边坡加固
现场试验
公路
slope engineering
glass fiber reinforced polymer（GFRP）
GFRP anchor
slope reinforcement
field test
highway
