摘要
为了研究管道型岩溶对隧道衬砌结构的影响,以郑万线典型岩溶隧道为依托,开展管道型岩溶隧道衬砌结构受力特征试验研究,分析岩溶管道发育位置、管道尺寸及管道内水头高度对衬砌内力的影响。结果表明:当岩溶管道位于隧道拱顶或仰拱中心时,衬砌轴力及弯矩沿隧道轴线呈对称分布,当岩溶管道位于隧道边墙中部或边墙脚时,存在岩溶管道的一侧轴力显著大于另一侧区域;随着管道内水头高度及管道直径的增加,岩溶管道与衬砌相交处的轴力及弯矩均大幅增加;岩溶管道与隧道相交处的衬砌内侧承受较大的正弯矩,衬砌内侧被拉裂的风险较高。研究结果可为管道型岩溶隧道的结构设计及施工提供指导。
This paper presents an experimental study on the influence of the pipe-type karst on the mechanical characteristics of tunnel lining structures.Based on the typical karst tunnel of Zhengzhou to Wanzhou high-speed railway,the effects of karst pipeline position,pipeline size,and water head height on lining internal force were analyzed.The results show that the axial force and bending moment of the lining are distributed symmetrically along the tunnel axis when the karst pipeline is located at the center of the tunnel vault or invert.In contrast,the axial force on the side with karst pipeline is significantly greater than that of the other side when the karst pipeline is located in the middle or foot of the sidewall.As the water head height and the diameter of the pipeline increase,the axial force and bending moment at the intersection between the karst pipeline and the lining increase greatly.The inner side of the lining at the intersection between the karst pipeline and tunnel bears a large positive bending moment,resulting in a high risk of cracking inside the lining.The research results can provide guidances for the design and construction of pipe-type karst tunnels.
作者
谭信荣
樊浩博
宋玉香
刘勇
杨海宏
Tan Xinrong;Fan Haobo;Song Yuxiang;Liu Yong;Yang Haihong(China Railway Eryuan Engineering Group Co.Ltd.,Chengdu 610031,P.R.China;State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang 050043,P.R.China)
出处
《地下空间与工程学报》
CSCD
北大核心
2021年第6期1847-1856,共10页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金(52108378)
河北省自然科学基金(E2020210068)
省部共建交通工程结构力学行为与系统安全国家重点实验室自主课题(ZZ2020-01)
中国中铁股份公司科技开发计划(2017-重点-19-01)
河北省重点研发计划项目(21375403D)。
关键词
岩溶隧道
管道型岩溶
模型试验
衬砌轴力
衬砌弯矩
karst tunnel
pipe-type karst cavity
model test
axial force of lining
bending moment of lining
