摘要
锚杆作为岩土工程的主要支护材料,广泛应用于边坡、基坑、隧道等工程中。目前在工程中最为常见的锚固技术,是有变形钢筋与水泥砂浆经钻孔注浆而形成。在实际应用中,因钢筋易腐蚀,耐久性差的特点,成为锚固工程中的一大隐患。玻璃纤维树脂强化(GFRP)锚杆强度高、质量轻、耐腐蚀性强、低松弛等优点,可以替代钢筋作为锚杆应用于锚固工程中。但GFRP筋作为脆性材料,其与水泥砂浆之间的握裹力能否满足要求,将会直接影响到锚固效果。通过对不同锚固深度的GFRP锚杆与水泥砂浆室内拉拔试验,发现握裹力随锚固深度增加而增大,握裹强度随着锚固深度的增加呈现减小的趋势,同时水泥砂浆凝固时间对握裹强度有较大影响,7 d初凝时握裹强度仅有28 d终凝时的60%左右。通过与同等直径钢筋锚杆与水泥砂浆握裹力对比发现,GFRP锚杆与水泥砂浆握裹力能够达到钢筋锚杆的要求。
As important supporting materials in the geotechnical engineering, anchors are widely used inprojects of slope,tunnel and foundation pit. At present tlie most common anchorage technology is based on drillinggrouting for deformed bar and cement mortar. While it is a significant hidden trouble due to as susceptibility to corrosion and poor durability. G F R P bolt has high strength,ligand low relaxation,hence it can replace rebar in anchorage engineering. However,whether the bond stress between GFRP and cement mortar could meet the requirements will directly influent the anchoring brittleness. A series of indoor drawing tests was set u p on G F R P and cement mortar at dThe results showthat the bond stress is larger as the anchoring depth increases andopposite performance. T h e coagulation time of cement mortar also has a strong effect on the bond strength,thestrength at initial set accounts for only 6 0 % of that of final set. Contrast to the performance of rebar in s ame diameter,the bond stress between G F R P and cement mortar could meet tlie requirements w a s found.[
作者
崔宇鹏
简文星
谭宏大
余科
CUI Yu-peng JIVN Wen - xing T A N Hong-da YU Ke(China University of Geosciences （Wuhan） E n g i n e e r i n g Institute,Wuhan 430074, P. R . Chin)
出处
《科学技术与工程》
北大核心
2017年第14期251-255,共5页
Science Technology and Engineering
基金
江西省交通运输厅科技计划(2015c0026)资助
