采用有限元软件建立了江西省某座大断面隧道地层-结构数值计算模型,对波纹钢板套衬加固隧道衬砌的力学性能进行研究.结果表明:波纹钢板套衬分担了部分围岩压力,隧道衬砌的应力出现重分布;波纹钢板套衬与既有衬砌组合结构的承载力随着锚栓数量的增加而增强,建议拱顶至拱肩区间的锚栓间距为2～3 m、拱肩至拱脚位置锚栓间距为1 m;既有衬砌和波纹钢板套衬对围岩压力的承担比呈负相关;考虑经济性和波纹钢板厚度对锚栓受力的影响,建议波纹钢板厚度不超过6 mm.
Mechanical Properties of Large Section Tunnel Reinforced by Corrugated Steel Plate Lining
A strata-structure model of a large section tunnel in Jiangxi province was established by using finite element software,and the mechanical properties of the tunnel reinforced by corrugated steel sheet plate lining were studied.The results show that,the corrugated steel sheet bushing shares part of the surrounding rock pressure,and the stress of the tunnel lining is redistributed.With the increase number of anchor bolts,the composite structure bearing capacity of corrugated steel plate lining and the original lining is enhanced.It is recommended to control the anchor bolt spacing between arch and spandrel in 2～3 m,and the anchor bolt spacing between spandrel and arch foot in 1 m.The surrounding rock pressure sharing ratio of the tunnel lining and the corrugated steel plate is negatively correlated.Due to the economy and the stress influence of corrugated steel plate lining on the anchor bolt,the thickness of the corrugated steel plate should not exceed 6 mm.
large section tunnellining reinforcementcorrugated steel plate liningtunnel liningmechanical propertiesstressanchor bolt
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