浸水条件下树脂锚索锚固性能劣化试验研究  

Experimental Study on the Deterioration of Anchoring Performance of Resin Anchor Cable under Water Immersion Condition

作　　者：钟官峰 张子洋 汪波[1] 刘金炜 刘锦超 王智佼 ZHONG Guanfeng;ZHANG Ziyang;WANG Bo;LIU Jinwei;LIU Jinchao;WANG Zhijiao(Key Laboratory of Transportation Tunnel Engineering Ministry of Education,Southwest Jiaotong University,Chengdu 610031,China;Gansu Changda Highway Co.,Ltd.,Lanzhou 730030,China)

机构地区：[1]西南交通大学交通隧道工程教育部重点实验室,四川成都610031 [2]甘肃长达路业有限责任公司,甘肃兰州730030

出　　处：《防灾减灾工程学报》2024年第3期568-578,604,共12页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(U2034205,51878571)资助。

摘　　要：预应力树脂锚索运用于交通/水工隧道中,服役环境复杂、年限长,富水围岩区段锚固系统面临潮湿环境长期侵蚀,在浅析潮湿环境侵蚀机制基础上,开展室内试验测试树脂锚固剂水中浸泡后力学性能变化,研究浸水条件下树脂锚索锚固性能变化特征。研究结果表明:树脂锚固剂试样具有弱吸水性,水中浸泡后单轴抗压强度、弹性模量及泊松比出现不同比例下降,试样破坏形态以垂直贯通的主裂缝为主,周围分布数目较多的细小裂缝,表面局部出现块状体的脱落与分离;随着水中浸泡时间的增长,树脂锚索锚固试件拉拔破坏模式由混凝土劈裂破坏,出现树脂锚固剂-锚索黏结失效的索体拔出破坏,平均极限锚固力下降,锚索锚固性能逐渐劣化,试件劈裂破坏时树脂锚固剂-混凝土界面产生分离,索体拔出破坏时为树脂锚固剂-锚索界面滑移。研究揭示了隧道潮湿环境下树脂锚索锚固性能劣化规律现象,有助于加深对预应力树脂锚固系统后期稳定性变化的认知。Pre-stressed resin anchor cables are used in transportation/hydraulic tunnels,which have a complex service environment and long service life.The anchoring system in the water-rich surround-ing rock section faces long-term erosion in a humid environment.Based on the analysis of the erosion mechanism in a humid environment,indoor experiments were conducted to test the mechanical proper-ties of resin anchoring agent samples after immersion in water,and to study the characteristics of changes in anchoring performance.The results showed that resin anchoring agent samples had weak water absorption.The uniaxial compressive strength,elastic modulus and Poisson's ratio decreased to varying degrees after soaking in water.The failure modes of the samples were mainly vertically con-nected main cracks,with a large number of small cracks distributed around them,and local block-like detachment and separation on the surface.With the increase of soaking time,the pullout failure mode of samples changed from concrete splitting to the failure of resin anchoring agent-anchor bond,result-ing in the failure of the cable body to pullout.The average ultimate anchoring force decreased,and the anchoring performance of resin anchor cable gradually deteriorated.The interface between resin an-choring agent and concrete separated during samples'splitting failure.The interface between resin an-choring agent and cable slid during cable's pullout failure.The study reveals the deterioration pattern of anchoring performance of resin anchor cables in humid tunnel environment,which helps to deepen the understanding of stability changes of pre-stressed resin anchoring systems in later stages.

关 键 词：树脂锚固剂 锚索 潮湿环境 锚固性能 拉拔 

分 类 号：U455[建筑科学—桥梁与隧道工程]