| 玻璃纤维增强聚合物抗浮锚杆抗拔性能试验研究与机制分析 |
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| 引用本文： | 张明义,寇海磊,白晓宇,等.玻璃纤维增强聚合物抗浮锚杆抗拔性能试验研究与机制分析[J].岩土力学,2014,35(4):1069-1076. |
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| 作者姓名： | 张明义 寇海磊 白晓宇 等 |
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| 作者单位： | 青岛理工大学 土木工程学院，山东 青岛 266033 |
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| 基金项目： | 国家自然科学基金资助项目(No. 51278261)。 |
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| 摘 要： | 抗浮锚杆作为一种竖向锚固技术在我国许多地区广泛应用,锚杆作为抗浮结构的核心其性能受到极大关注。但因钢材易腐蚀,传统金属锚杆的耐久性受到质疑,特别是地铁等地下工程存在杂散电流,限制了金属抗浮锚杆的应用。玻璃纤维增强聚合物(GFRP)抗浮锚杆是一种由树脂基体和玻璃纤维复合而成的新材料,与金属锚杆相比,它具有耐腐蚀、抗拉强度高、自重轻等优良特性。通过植入式裸光纤传感测试技术对GFRP抗浮锚杆的界面应力分布、荷载传递规律及破坏机制进行了研究,论证了GFRP抗浮锚杆使用的适宜性。试验表明,GFRP抗浮锚杆破坏以杆体基体材料剪切破坏为主,?28 mm锚杆极限抗拔力为250 kN,能够满足工程需要;杆体轴力沿深度方向逐渐递减,并且超过一定长度后杆体不再受力。结果显示,中风化岩地区,当锚固段长度为3.956.95 m时,轴力影响深度范围约为3.7 m,说明GFRP抗浮锚杆同样存在临界锚固深度问题。锚杆界面剪应力呈不均匀分布,剪应力峰值随荷载的增加逐渐向下转移,同时0值点也向杆体深部转移。研究成果可为GFRP抗浮锚杆应用于工程实际提供依据。
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| 关 键 词： | 非金属 玻璃纤维增强聚合物 抗浮锚杆 裸光纤 剪切破坏 |
| 收稿时间： | 2013-01-10 |
Experimental study and mechanism analysis of the anti-pulling behavior of glass fiber reinforced polymer anti-float anchor |
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| ZHANG Ming-yi,KOU Hai-lei,BAI Xiao-yu,ZHANG Zong-qiang.Experimental study and mechanism analysis of the anti-pulling behavior of glass fiber reinforced polymer anti-float anchor[J].Rock and Soil Mechanics,2014,35(4):1069-1076. |
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| Authors: | ZHANG Ming-yi KOU Hai-lei BAI Xiao-yu ZHANG Zong-qiang |
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| Institution: | School of Civil Engineering, Qingdao Technological University, Qingdao, Shandong 266033, China |
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| Abstract: | As a kind of vertical anchoring technique, the anti-float anchor has been widely used in China, whose performance has begun to receive more attentions from researchers. However, steels may be eroded easily by groundwater or chemical solutions, which will cause the reductions of mechanical strength and service life, especially in subway engineering the steel anti-float anchor is forbidden. Glass fiber reinforced polymer (GFRP) anti-float anchor is a new kind of material which is composed of resin matrix and glass fiber. Compared with steel anchor, the GFRP anti-float anchor has higher strength, corrosion-resistance and light weight behavior. The field tests show the feasibility of GFRP anti-float anchor through embedded bare fiber optics sensor technique. According to the test results, the GFRP anti-float anchor stress-strain behaviors, load transfer mechanism and failure mechanism are considered. The test indicates that GFRP anti-float anchor is basically about shear failure and pullout capacity of anchors with ? 28 mm are 250 kN, which can be satisfied with engineering demands. The axial forces of anchors fall gradually with depth, and it will not bear load beyond certain length. Results show that the effect distance of axial forces is about 3.7 m when the length of bond part is in range of 3.95~6.95 m in moderately weathered granite，which indicates that GFRP anti-float anchors also exist critical anchorage depth. The shear stress on interface of anchor is not evenly distributed, which peak value is being driven down, and so as to the zero value. The research results can provide evidence for application of GFRP anti-float anchor. |
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| Keywords: | non-metal glass fiber reinforced polymer anti-float anchor bare fiber shear failure |
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