摘要
随着隧道滑坡体系支护研究的深入,隧道滑坡与抗滑桩支护之间的受力研究尤为重要。为研究在0°、10°、20°、30°、40°、50°共6种滑带角度影响下隧道衬砌结构与抗滑桩的受力特征,以大准铁路南坪隧道为原型,采取室内缩尺试验以及数值模拟的方法,对三者间受力变形规律进行研究。得到以下结论:随着滑带角度的增大,桩身与隧道衬砌结构变形逐渐减小,作用在隧道以及桩身的土压力、弯矩值逐渐减小;同时,滑带角度为0°、10°、20°、30°时滑坡水平推力对隧道衬砌结构受力影响较大,40°、50°时滑坡水平推力影响显著衰减,拱脚竖向荷载占比逐渐增大。当滑带角度小于30°时,应当主要考虑滑坡水平推力对隧道结构的影响,大于30°时主要考虑由滑坡体所产生的竖向荷载对隧道衬砌结构的影响,此时应当对隧道仰拱及靠近坡体处拱脚位置重点加固。所得试验、模拟结果为隧道与抗滑桩体支护施工提供一定参考。
With the deepening of research on the support of the landslide tunnel system,the research on the force between the landslide tunnel and the anti-slide pile support is particularly important.In order to study the bearing characteristics of the tunnel lining structure and anti-slide piles under the influence of six slip angles of 0°,10°,20°,30°,40°,and 50°,based on the Nanping Tunnel of Dazhun Railway,the methods of indoor scale test and numerical simulation were used to study the law of force and deformation among the three.The results show that as the angle of the slip zone increases,the deformation of the pile and the tunnel lining structure gradually decreases,resulting in the gradual reduction of the soil pressure and bending moment acting on the tunnel and the pile.At the same time,at 0°,10°,20°,and 30°,the horizontal thrust of the landslide has a greater impact on the force of the tunnel lining structure.At the sliding zone angles of 40°and 50°,the impact of the horizontal thrust of the landslide is significantly attenuated,with gradual increase of the proportion of vertical load at the arch foot.When the sliding zone angle is less than 30°,the impact of the horizontal thrust of the landslide on the tunnel structure should be mainly considered.When it is greater than 30°,the main consideration is the impact of the vertical load generated by the landslide on the tunnel lining structure.At this time,the inverted arch of the tunnel and the arch foot near the slope should be strengthened.The experimental and simulation results obtained in this paper provide a certain reference for the construction of tunnels and anti-sliding pile support.
作者
李涛
罗波
朱宝龙
陈刚
LI Tao;LUO Bo;ZHU Baolong;CHEN Gang(Institute of Systems Engineering,China Academy of Engineering Physics,Mianyang 621999,China;China MCC5 Group Corp.,Ltd.,Chengdu 610063,China;School of Civil Engineering and Architecture,Southwest University of Science and Technology,Mianyang 621010,China)
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2024年第2期181-194,共14页
Journal of the China Railway Society
基金
四川省科技计划(2023NSFSC1913)。
关键词
滑带角度
滑坡
隧道
抗滑桩支护
非线性受力
sliding zone angle
landslide
tunnel
anti-skid pile support
nonlinear mechanical characteristics
