| 杨佰恒,吴道勇,王 洁.全黏结BFRP锚杆传力规律及破坏机理试验研究[J].甘肃地质,2025,(2):55-63 |
| 全黏结BFRP锚杆传力规律及破坏机理试验研究 |
| Experimental Study ｏn Force Transfer ａnd Failure Mechanism ｏf Fully Bonded BFRP Anchor |
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| DOI： |
| 中文关键词: BFRP锚杆 循环加载 现场试验 应力应变 |
| 英文关键词:BFRP anchors cyclic loading field test stress strain |
| 基金项目:贵州省科技计划项目（黔科合基础－ZK〔２０２２〕重点０１８）资助 |
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| 中文摘要: |
| 玄武岩纤维增强聚合物锚杆（BFRP锚杆）高强度和耐腐蚀等性质使其逐渐被用于岩土锚固工程，但全黏结BFRP锚杆的传力规律和破坏机理尚需进一步研究。本文通过现场拉拔试验研究全黏结BFRP锚杆的位移和传力规律，发现BFRP锚杆滑移位移具有累积特征，即后一级荷载下的位移增量值远大于前一级；此外，锚杆最大滑移位移与最大拉拔荷载不同步，存在一定滞后现象，卸载后锚杆位移有少量恢复。BFRP锚杆轴力和界面剪力随锚固深度的增加而逐渐减小，随循环荷载的增加而增大，说明全黏结BFRP锚杆荷载首先从孔口附近逐步向深部传递。根据锚杆界面剪应力的衰减速率，将锚固系统分为剪应力快速响应区和剪应力缓慢传递区。讨论了锚杆黏结长度对黏结强度的影响，针对试验场地的地质环境条件，BFRP锚杆最佳黏结长度为3. 5 m。研究结果为全黏结BFRP锚杆工程设计和结构优化奠定基础。 |
| 英文摘要: |
| Basalt fiber reinforced polymer bolt （BFRP anchor） has been gradually used in geotechnical anchoring engineering due to its high strength and corrosion resistance. However, the force transfer and failure mechanism of BFRP anchor need further study. The displacement and force transfer of fully bonded BFRP anchor bolts are studied by field pull-out tests. It is found that the slip displacement of BFRP anchor bolts has a cumulative character, that is, the incremental value of displacement under the load of the last stage is much larger than that of the previous stage. In addition, the maximum slip displacement of bolt is not synchronized with the maximum pull load, there is a certain lag phenomenon. Moreover, the displacement of bolt recovers a little after unloading. The axial force and interfacial shear of BFRP bolt gradually decrease with the increase of anchoring depth, while increase with the increase of cyclic load, which indicates that the load of fully bonded BFRP bolt is first transferred from near the hole to the deep. According to the decay rate of the shear stress at the interface of the bolt, the anchorage system is divided into the shear stress fast response zone and the shear stress slow transfer zone. The influence of bonding length of bolt on bonding strength is discussed, and the optimum bonding length of BFRP bolt is determined to be 3. 5 m. The research results lay a foundation for engineering design and structural optimization of fully bonded BFRP anchors. |
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