风化岩地基全螺纹玻璃纤维增强聚合物抗浮锚杆承载特征现场试验

发布时间：2018-05-26 10:58

本文选题：中风化花岗岩 + 全螺纹GFRP抗浮锚杆　；参考：《岩土力学》2014年09期

【摘要】：玻璃纤维增强聚合物(GFRP)抗浮锚杆是一种由树脂和玻璃纤维复合而成的新型材料,与传统的钢筋锚杆相比,它具有比强度高、耐腐蚀性强和抗电磁干扰能力强的优点。基于6根GFRP抗浮锚杆和4根钢筋抗浮锚杆现场足尺拉拔破坏性试验,研究了中风化花岗岩中GFRP抗浮锚杆的承载特征和界面黏结特性。试验结果表明,抗浮锚杆的破坏形式有2种:锚杆和砂浆界面剪切破坏,砂浆和围岩界面剪切破坏。直径为28 mm的GFRP抗浮锚杆和钢筋抗浮锚杆的极限抗拔承载力均为225kN,直径为32 mm GFRP抗浮锚杆极限抗拔承载力为250 kN,能够满足工程实际需要;GFRP抗浮锚杆与砂浆(第一界面)的平均黏结强度为1.50~1.54 MPa;GFRP抗浮锚杆砂浆与围岩(第二界面)的平均黏结强度为0.32~0.37 MPa,略低于钢筋抗浮锚杆第二界面的平均黏结强度;直径为32 mm的GFRP抗浮锚杆第二界面平均黏结强度高于直径为28mm的GFRP抗浮锚杆。在此基础上,进一步分析论证了GFRP抗浮锚杆的破坏机制,为GFRP抗浮锚杆的工程应用提供了理论依据。
[Abstract]:Glass fiber reinforced polymer (GFRP) anti-floatation anchor rod is a new material composed of resin and glass fiber. Compared with the traditional reinforced anchor bar, it has the advantages of high specific strength, strong corrosion resistance and strong resistance to electromagnetic interference. Based on the full-scale pull-out destructive tests of six GFRP anti-floating anchors and four reinforced anti-floating anchors, the load-bearing characteristics and interfacial bonding properties of GFRP anti-floating anchors in weathered granite were studied. The test results show that there are two kinds of failure modes of anti-floating bolt: shear failure of bolt and mortar interface and shear failure of mortar and surrounding rock interface. The ultimate uplift capacity of GFRP anchor rod with diameter of 28 mm and that of steel bar is 225 KN, and that of diameter 32 mm GFRP anchor rod is 250kN, which can meet the practical engineering needs. The average bonding strength of the interface is 1.50 ~ 1.54 MPA ~ (-1) MPA ~ (-1) ~ (-1) ~ (-1) MPR / GFRP anti-floating bolt mortar and surrounding rock (second interface), which is 0.32 ~ 0.37 MPa, which is slightly lower than the average bond strength of the second interface of a reinforced anti-floating anchor rod. The average bonding strength of the second interface of the GFRP anti-floating anchor with diameter of 32 mm is higher than that of the GFRP anti-floating anchor with the diameter of 28mm. On this basis, the failure mechanism of GFRP anti-floating anchor rod is further analyzed and demonstrated, which provides a theoretical basis for the engineering application of GFRP anti-floating anchor rod.
【作者单位】：青岛理工大学土木工程学院;青岛市户外广告与亮化管理办公室;
【基金】：国家自然科学基金资助项目(No.51278261) 教育部高等学校博士学科点专项科研基金资助项目(No.20133721110003)
【分类号】：TU476

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