加筋锈蚀对氯离子侵蚀海底隧道锚固支护结构影响分析
发布时间：2018-08-21 19:28
【摘要】：由于长期氯离子侵蚀及干湿交替环境作用,海底隧道锚固支护结构易于加筋锈蚀,造成支护结构强度的降低.结合某海底隧道Ⅲ级和Ⅳ级围岩锚固支护结构设计,基于前人研究理论及试验成果,采用数值分析软件FLAC3D及有限元强度折减思想,探讨加筋锈蚀对锚固支护结构体系承载作用的劣化影响.研究表明,(1)锚杆锈蚀削弱了锚固支护结构的支护强度;随着加筋锈蚀的增加,隧道加锚围岩的变形逐渐增大;锈蚀对隧道加锚围岩起拱线处的收敛变形影响最明显,Ⅲ级围岩位移锈蚀影响度最大可达56.7%,Ⅳ级围岩位移锈蚀影响度最大可达62.98%.(2)锚杆锈蚀降低了锚固支护结构的锚固作用,锈蚀对锚固注浆体的黏结作用的损失影响比对锚杆应力作用的损失影响大;Ⅲ级围岩锚杆最大应力锈蚀影响度最大为11.6%,锚固注浆体最大剪应力锈蚀影响度最大达18.6%;Ⅳ级围岩锚杆最大应力锈蚀影响度最大为12.3%,锚固注浆体最大剪应力锈蚀影响度最大达20.1%;说明锈蚀对Ⅳ级围岩锚固支护结构影响比Ⅲ级围岩略大.研究结果可为海底隧道锚固支护结构运营风险评估提供一定的数据依据.
[Abstract]:Because of the long-term chlorine ion erosion and the alternating environment of dry and wet, the anchoring structure of undersea tunnel is easy to be reinforced and corroded, resulting in the decrease of the strength of the supporting structure. Based on the previous research theory and experimental results, combined with the design of surrounding rock Anchorage support structure of a subsea tunnel, the numerical analysis software FLAC3D and the idea of finite element strength reduction are adopted. The effect of reinforcement corrosion on the bearing capacity of anchor support system is discussed. The results show that: (1) Anchor corrosion weakens the support strength of the bolting support structure; with the increase of reinforcement corrosion, the deformation of the tunnel surrounding rock increases gradually, and the effect of corrosion on the convergence deformation of the arched line of the tunnel bolted wall rock is the most obvious. The maximum corrosion effect of the displacement of the third grade surrounding rock can reach 56.7%, and that of the 鈪，
本文编号：2196121
[Abstract]:Because of the long-term chlorine ion erosion and the alternating environment of dry and wet, the anchoring structure of undersea tunnel is easy to be reinforced and corroded, resulting in the decrease of the strength of the supporting structure. Based on the previous research theory and experimental results, combined with the design of surrounding rock Anchorage support structure of a subsea tunnel, the numerical analysis software FLAC3D and the idea of finite element strength reduction are adopted. The effect of reinforcement corrosion on the bearing capacity of anchor support system is discussed. The results show that: (1) Anchor corrosion weakens the support strength of the bolting support structure; with the increase of reinforcement corrosion, the deformation of the tunnel surrounding rock increases gradually, and the effect of corrosion on the convergence deformation of the arched line of the tunnel bolted wall rock is the most obvious. The maximum corrosion effect of the displacement of the third grade surrounding rock can reach 56.7%, and that of the 鈪，
本文编号：2196121
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