高压水工隧洞BFRP网格增强钢筋混凝土衬砌试验研究

发布时间：2018-07-07 17:53

本文选题：水工隧洞 + 高压　；参考：《水利水电技术》2017年07期

【摘要】：为探究玄武岩纤维增强树脂复合材料网格(简称BFRP网格)对高压水工隧洞钢筋混凝土衬砌结构裂缝控制能力及承载能力的增强作用,进行了高压水工隧洞钢筋混凝土衬砌结构模型对比试验,试验采用真实高压水加载。通过对隧洞模型内壁环向变形监测,以及通过声发射系统对模型在加载全过程中的声发射信息监测,对比分析了BFRP网格对裂缝产生及扩展的影响。研究结果显示,与常规混凝土衬砌结构模型相比较,BFRP网格增强钢筋混凝土衬砌结构模型的极限承载力提高21%、宏观裂缝最大开度减少了68%、宏观裂缝空间分布更为分散;开裂前内壁环向拉应变增大了81%,开裂时的声发射绝对能量占加载过程中声发射总累积绝对能量的33.78%(前者为99.38%),主要破坏模式表现为韧性破坏。可见,BFRP网格可显著提高高压水工隧洞钢筋混凝土衬砌结构的裂缝控制能力和承载能力。
[Abstract]:In order to investigate the effect of basalt fiber reinforced resin composite mesh (BFRP mesh) on the crack control and bearing capacity of reinforced concrete lining structure of high pressure hydraulic tunnel, The model comparison test of reinforced concrete lining structure of high pressure hydraulic tunnel was carried out, and the real high pressure water loading was used in the test. The influence of BFRP mesh on crack generation and propagation is compared by monitoring the inner wall circumferential deformation of the tunnel model and monitoring the acoustic emission information of the model during the whole loading process by acoustic emission system. The results show that compared with the conventional concrete lining structure model, the ultimate bearing capacity of BFRP mesh reinforced concrete lining structure model is increased by 21%, the maximum opening of macroscopic crack is reduced by 68%, and the spatial distribution of macroscopic crack is more dispersed. The tensile strain of the inner wall increases by 81% before cracking. The absolute energy of acoustic emission (AE) accounts for 33.78% (99.38%) of the total accumulated absolute energy of AE during loading. The main failure mode is ductile failure. It can be seen that BFRP mesh can significantly improve the crack control capacity and bearing capacity of reinforced concrete lining structure of high pressure hydraulic tunnel.
【作者单位】：广西大学土木建筑工程学院工程防灾与结构安全教育部重点实验室;
【基金】：国家自然科学基金项目(51369007)
【分类号】：TV544

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