摘要
针对隧道邻域内偏心堆载工况导致隧道破坏,考虑偏心堆载和盾构衬砌环间作用力的影响,基于修正惯用法,推导出衬砌围压和内力(弯矩、轴力、剪力)的计算公式。通过算例分析,研究堆载数值、堆载位置和隧道埋深对隧道衬砌围压和内力的影响规律。研究结果表明:偏心堆载会使隧道衬砌围压产生不对称分布,其中加载侧的围压大于非加载侧的围压,最大围压出现在加载侧的下方;偏心堆载对加载侧的弯矩和剪力影响较大,对轴力影响较小;随着堆载载荷不断增大,衬砌围压和剪力整体不断变大,零剪力的位置不变;随着堆载中心偏移距离变大,衬砌围压和弯矩不断减小;随着隧道埋深增大,衬砌围压和轴力变大,堆载对隧道产生的附加应力减小。
For the phenomenon of tunnels damaged by eccentric loading conditions in the vicinity of tunnel,considering the influence of eccentric load and shield lining ring forces,based on the modified routine method,the calculation formulas of lining confining pressure and internal force(bending moment,axial fore,shear fore) were derived.An example analysis was carried out to analyze the influence rule of the weight of load,the position of load and depth of tunnel on the lining confining pressure and internal force of the tunnel.The results show that the eccentric load causes the asymmetrical distribution of tunnel lining confining pressure.The confining pressure on the loading side is greater than that on the non-loading side,and the maximum confining pressure appears below the loading side.Eccentric load has greater influence on the bending moment and shear force of the loading side,and has less influence on the axial force.With the constantly increase of the load,lining confining pressure and shear force become larger and the position of zero shear force remains unchanged.As the offset distance becomes larger in the center of the heap,lining confining pressure and bending moment decrease continuously.As the tunnel depth increases,the tunnel lining confining pressure and the axial force increase and the impact of the surcharge decreases.
作者
魏纲
洪文强
魏新江
林心蓓
王立忠
WEI Gang;HONG Wenqiang;WEI Xinjiang;LIN Xinbei;WANG Lizhong(Department of Civil Engineering,Zhejiang University City College,Hangzhou 310015,China;College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2019年第7期1645-1654,共10页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(51778576)
杭州市科委资助项目(20180533B07)~~
关键词
偏心堆载
盾构隧道
横向受力
修正惯用法
eccentric loading
shield tunnel
transverse force
modified routine method
