摘要
开展高地应力作用下隧道衬砌受力特性研究,对完善支护结构设计方法具有重要意义。采用室内物理模型试验方法,通过设置初始高地应力和变化侧向压力系数,对下穿断层破碎带隧道围岩与结构的力学响应规律进行系统研究。试验结果表明:在高地应力作用下,下穿倾斜破碎带的隧道围岩变形、应力和衬砌内力均出现明显的非对称性与偏压现象,近断层侧拱脚应力为远断层侧拱脚的2.4倍;当侧压力系数为0.5时,远断层侧拱脚弯矩为近断层侧拱脚弯矩的1.8倍;切向围岩应力受断层破碎带的影响较大,在0.1 D~0.3 D洞壁距离应力集中较为明显;侧压力系数增大,非对称性增强,受力最大的位置为近断层拱脚,受力最小的位置为拱底;同时断层破碎带导致衬砌结构受力差异性增大,拱顶沉降明显,衬砌结构逐渐失稳,建议对拱脚、拱顶与拱底进行构造加强。
The research on the stress characteristics of tunnel lining under high ground stress is of great significance for improving the design method of supporting structures.Using the indoor physical model test method,a systematic study was conducted on the mechanical response law of the surrounding rock and structure of tunnels under the fault fracture zone by setting the initial high ground stress and changing the lateral pressure coefficient.The test results show that under the action of high ground stress,the deformation,stress and lining internal force of the surrounding rock of the tunnel under the inclined fracture zone show significant asymmetry and asymmetric loading,and the stress of the arch foot on the near fault is 2.4 times that of the arch foot on the far fault.At the lateral pressure coefficient of 0.5,the bending moment of the far fault side arch foot is 1.8 times that of the near fault side arch foot.The tangential stress of the surrounding rock is greatly affected by the fault fracture zone,with more obvious stress concentration in a distance of 0.1 D~0.3 D from the tunnel wall.With the increase of the lateral pressure coefficient,the asymmetry increases.The maximum stress position is at the arch foot of near fault,with the minimum stress position at the arch bottom.At the same time,the fault fracture zone causes an increase in the stress difference of the lining structure,significant vault settlement,and gradual instability of the lining structure.Structure strengthening is recommended for the arch foot,vault and arch bottom.
作者
黄锋
朱涛
刘星辰
向晋扬
王毅
HUANG Feng;ZHU Tao;LIU Xingchen;XIANG Jinyang;WANG Yi(State Key Laboratory of Mountain Bridge and Tunnel Engineering,Chongqing Jiaotong University,Chongqing 400074,China;School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China)
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2023年第12期174-181,共8页
Journal of the China Railway Society
基金
国家自然科学基金(52078090)
重庆市自然科学基金(cstc2020jcyj-msxmX0679)
省部共建山区桥梁及隧道工程国家重点实验室开放基金(SKLBT-19-006,SKLBT-YF2106)。
关键词
隧道
断层破碎带
模型试验
衬砌结构
侧压力系数
tunnel
fault fracture zone
model test
lining structure
side pressure coefficient
