水利学报2017，Vol.48Issue(7)：825-836,12.DOI:10.13243/j.cnki.slxb.20161057
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
摘要
Abstract
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 affects the stability of anchorage.The high strength,high durability and corrosion resistance allow Glass Fiber Reinforced Polymer (GFRP) a suitable alternative to replace steel bars.This study carried out a number of pulling experiments on GFRP bars embedded soft rock in field to analyse the anchor performance associated with varying anchoring effect and bond strength under cyclic loading.Test results show that the effective anchorage length of the GFRP bar in soft rock depends on bond strength between the grout and surrounding 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 interface.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.关键词
软岩/GFRP锚杆/循环荷载/黏结蜕化/水位升降Key words
submerged soft rock/GFRP bar/cyclic load/bond degeneration/water level fluctuation分类
建筑与水利引用本文复制引用
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):825-836,12.基金项目
国家自然科学基金项目(41472240,41602352) （41472240,41602352）
中央高校基本科研业务费专项基金项目(2015B25514,2015B17214) （2015B25514,2015B17214）
