摘要
为探明钢板-短锚结构修补张开型衬砌裂缝的效果,采用通用有限元软件ABAQUS对大偏心受压状态下经过钢板-短锚修补前后的钢筋混凝土衬砌力学特性、破坏形态进行对比。研究结果表明:(1)钢板-短锚结构修补裂损程度为30%、50%、70%的衬砌,相较于未修补的衬砌结构,极限承载力分别提升20.37%、24.22%、28.36%,跨中挠度值分别下降54.9%、32.5%、36.5%;(2)以衬砌裂损程度70%时极限承载力对应的跨中挠度值为基准,跨中挠度值由小到大分别为修补30%<完好构件<修补50%<修补70%<裂损30%<裂损50%<裂损70%;(3)衬砌裂损程度为30%、50%、70%时,经过钢板-短锚修补后衬砌中的钢筋最大拉应力分别下降8.24%、2.98%、10.90%,最大压应力分别下降9.38%、6.40%、0.89%;(4)衬砌结构破坏时,数值模拟和模型试验的破坏模式均相同,表现为受压侧混凝土产生不同程度压溃,经过修补后衬砌原有裂缝的扩展得到明显抑制,提升衬砌结构的整体性,降低掉块掉渣风险。钢板-短锚结构修补衬砌裂缝具有快速、微创的特点,结合以上研究结论为维修加固运营铁路隧道衬砌裂缝提供参考。
In order to find out the effect of repairing tension lining cracks with steel plate-short anchor,this paper uses the general finite element software ABAQUS to compare the mechanical characteristics and failure modes of reinforced concrete lining before and after repairing with steel plate-short anchor under large eccentric compression.The results show that:(1)Compared with the unrepaired lining structure,the ultimate bearing capacity of the lining with 30%,50%and 70%cracking repaired by steel plate-short anchor structure increases by 20.37%,24.22%and 28.36%respectively,and the mid-span deflection decreases by 54.9%,32.5%and 36.5%respectively;(2)Based on the mid-span deflection value corresponding to the ultimate bearing capacity when the lining crack degree is 70%,the mid-span deflection values are repaired from small to large by 30%<intact component<repaired 50%<repaired 70%<cracked 30%<cracked 50%<cracked 70%;(3)When the degree of lining crack is 30%,50%and 70%,the maximum tensile stress of steel bar in lining after repairing with steel plate-short anchor decreases by 8.24%,2.98%and 10.90%respectively,and the maximum compressive stress decreases by 9.38%,6.40%and 0.89%respectively;(4)When the lining structure is damaged,the failure modes of numerical simulation and model test are the same,which shows that the concrete on the compression side is crushed to different degrees.After repairing,the expansion of the original cracks in the lining is obviously restrained,the integrity of the lining structure is improved,and the risk of falling blocks and slag is reduced.The repairing of lining cracks by steel plate-short anchor structure is quick and minimally invasive.The above research conclusions provide some references for repairing and strengthening the lining cracks of operating railway tunnels.
作者
徐靖威
龚伦
龚兴旺
钟建
王希元
XU Jingwei;GONG Lun;GONG Xingwang;ZHONG Jian;WANG Xiyuan(Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu 610031,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)
出处
《铁道标准设计》
北大核心
2023年第9期142-148,共7页
Railway Standard Design
基金
国家重点研发计划项目(2017YFC0806000)
国家自然科学基金面上项目(51478392)。
关键词
铁路隧道
衬砌裂缝
钢板-短锚结构
维修加固
力学特征
数值模拟
railway tunnel
lining crack
steel plate-short anchor structure
maintenance and reinforcement
mechanical performance
numerical simulation
