山岭隧道背后多空洞对衬砌结构影响分析  

Analysis of multple voids behind mountain tunnel the lining structure

作　　者：李振[1] 李德建[2] 彭富强[1] 

机构地区：[1]湖南交通职业技术学院岩土工程材料研究所,湖南长沙410132 [2]中南大学土木工程学院,湖南长沙410075

出　　处：《铁道科学与工程学报》2016年第1期138-145,共8页Journal of Railway Science and Engineering

摘　　要：山岭隧道衬砌背后空洞可能出现在单一的部位,也可能在衬砌结构的一侧或两侧同时出现多个空洞。针对山岭隧道衬砌背后拱顶和左拱腰,拱顶和左拱脚、左拱腰和左拱脚、两侧拱腰和两侧拱脚等不同位置同时出现空洞的不同工况,计算对隧道衬砌结构应力和应变的影响。计算结果表明:拱脚部位产生空洞,隧道结构主要承受水平作用力;出现空洞的衬砌结构一侧的变形导致衬砌内部出现附加应力;不同位置同时出现空洞时均导致围岩应力的再次重分布产生应力集中,隧道受到偏压作用;左拱腰左拱脚、两侧拱腰同时存在空洞时,衬砌结构面临的损坏风险更为显著。The void may appear in a single position behind the mountain tunnel lining, or the multiple voids may appear in one side or both sides of the,lining structure. With regard to multiple voids appearing at different positions such as vault and left arch waist, vault and left arch foot, left arch waist and left arch foot, both sides of arch waist and both sides of arch foot, the stress and the strain of the tunnel lining structure were calculated. The results show that the tunnel lining structure is mainly subjected to the horizontal forces when the void appears in arch foot; the deformation of one side structure because of void lead to the lining additional stress; the multiple voids in different positions at the same time result in rock stress redistribution and concentrated stress, which will lead to tunnel suffers from bias effect; the damage risk of mountain tunnel lining is high when the tiple voids appear in left arch waist and left arch foot or both sides of arch waist at the same time.

关 键 词：山岭隧道 多空洞 不同位置 衬砌结构 应力和应变 

分 类 号：U451[建筑科学—桥梁与隧道工程]