| 李国维,郑诚,陈圣刚,吴建涛,曹雪山,袁俊平.引江济淮软岩全黏结GFRP筋锚固蜕化现场实验[J].水利学报,2017,48(7):825-836 |
| 引江济淮软岩全黏结GFRP筋锚固蜕化现场实验 |
| Bond degeneration of fully grouted GFRP bar in submerged soft rock in diversion of water from Changjiang River to Huaihe River |
| 投稿时间：2016-10-10 |
| DOI：10.13243/j.cnki.slxb.20161057 |
| 中文关键词: 软岩 GFRP锚杆 循环荷载 黏结蜕化 水位升降 |
| 英文关键词: submerged soft rock GFRP bar cyclic load bond degeneration water level fluctuation |
| 基金项目: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） |
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| 中文摘要: |
| 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。 |
| 英文摘要: |
| Anchor reinforcements in diversion of water project from Changjiang River to Huaihe River are subjected to cyclic loading in slopes. Under cyclic loading, the bonding state of anchor reinforcement af-fects the stability of anchorage. The high strength, high durability and corrosion resistance allow Glass Fi-ber Reinforced Polymer (GFRP) a suitable alternative to replace steel bars. This study carried out a num-ber of pulling experiments on GFRP bars embedded soft rock in field to analyse the anchor performance as-sociated with varying anchoring effect and bond strength under cyclic loading. Test results show that the ef-fective anchorage length of the GFRP bar in soft rock depends on bond strength between the grout and sur-rounding rock. The high degree of weathering and low strength of the surrounding rock resulted in a large effective length of anchor bar. The depth to which the bond degenerated as a result of cyclic load is less than the effective anchorage depth. Above the bond degeneration depth,friction is mobilized at bar-rock in-terface. Below this depth, bond force is mobilized. Bonding state would completely fail if it was damaged. Bond degeneration under the same cyclic load frequency decreased with depth. At the same depth, the bond degeneration increased with increasing frequency of cyclic load. The maximum pulling force resulted from the water level change is lower than the design load of anchor reinforcement, and hence the factor of safety of GFRP anchors is relatively safe. Submerged soft rock which is reinforced by GFRP bar has better durability and load stability. |
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