引江济淮软岩全黏结GFRP筋锚固蜕化现场实验

发布时间：2018-04-17 17:46

本文选题：软岩 + GFRP锚杆　；参考：《水利学报》2017年07期

【摘要】：引江济淮工程边坡加固锚杆运行中会承受循环荷载,循环荷载下锚杆的黏结状态蜕化影响锚固稳定。玻璃纤维增强聚合物(Glass Fiber Reinforced Polymer,GFRP)筋因其耐腐蚀、高强度可用于替代钢筋解决锚杆耐久性问题。通过现场软岩边坡GFRP锚杆拉拔实验,研究循环荷载作用下的锚固效果和黏结状态变化。研究结果表明,软岩内GFRP锚杆的有效锚固长度和锚杆胶结体与围岩的黏结强度相关,低强度或破碎程度高的围岩对应较大的有效锚固长度。荷载循环所造成的黏结蜕化深度小于有效锚固深度,黏结蜕化深度以上杆体界面提供摩擦力,以下提供黏结力。黏结状态一旦受损,黏结力将失去作用。同一深度处荷载循环影响黏结蜕化的作用随次数递增,不同深度处荷载循环影响黏结蜕化的作用随深度递减。渠道水位升降产生的最大拉拔荷载小于设计荷载,GFRP锚杆的抗拔力具有较大的安全储备。GFRP锚杆加固水下软岩具有更好的耐久性和持载稳定性。
[Abstract]:The anchors of Jiangjiang-Jiji-Huaihe River project will bear cyclic load in operation, and the stability of anchors will be affected by the bonding state of anchors under cyclic load.Glass fiber reinforced polymer (Fiber Reinforced Polymer GFRP) tendons can be used as a substitute for reinforcing bars to solve the durability problem of anchors because of their corrosion resistance.The anchoring effect and the change of bonding state of soft rock slope under cyclic load were studied by GFRP bolt drawing experiment.The results show that the effective anchoring length of GFRP anchor rod in soft rock is related to the bond strength of surrounding rock, and the effective anchoring length of rock with low strength or high fracture degree is larger.The bonding depth caused by the load cycle is less than the effective anchoring depth, and the friction force is provided by the interface of the bar above the depth of bonding degradation, and the bonding force is provided below.Once the bonding state is damaged, the bonding force will lose its effect.The effect of load cycle on bonding degradation increases with the number of times at the same depth, and decreases with the depth of load cycle at different depths.The maximum pull-out load caused by the water level rise and fall of the channel is less than that of the GFRP anchor under the design load. The anti-pulling force of GFRP anchor has a greater safety reserve. GFRP anchor has better durability and stability in strengthening the soft rock under water.
【作者单位】：河海大学岩土力学与堤坝工程教育重点实验室;河海大学道路与铁道工程研究所;河海大学岩土工程研究所;安徽省投资集团控股有限公司;
【基金】：国家自然科学基金项目(41472240,41602352) 中央高校基本科研业务费专项基金项目(2015B25514,2015B17214)
【分类号】：TV223

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