新型气囊压缩层作用下的隧道力学行为  

Tunnel Mechanical Behavior Under Action of Novel Inflatable Compression Layer

作　　者：李培锋 李守仁 王义成 唐亘跻 张海峰 LI Pei-feng;LI Shou-ren;WANG Yi-cheng;TANG Gen-ji;ZHANG Hai-feng(Yunnan Lincang-Shuangjiang Expressway Co.,Ltd.,Lincang,Yunnan 675800,China;Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education,Tongji University,Shanghai 200092,China;School of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]云南临双高速公路有限公司,云南临沧675800 [2]同济大学岩土及地下工程教育部重点实验室,上海200092 [3]同济大学土木工程学院,上海200092

出　　处：《公路交通科技》2024年第11期178-188,共11页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(52038008,42207176);云南交投科技创新计划项目(YCIC-YF-2022-01);公路桥隧智能运维技术浙江省工程中心开放基金项目(202303G)。

摘　　要：针对隧道穿越复杂地质环境时易出现的围岩大变形灾害,考虑既有可压缩层支护结构的局限性,提出一种能够有效吸收围岩变形能量、充分调节围岩压力分布和将围岩压力均匀传递至衬砌结构上的新型气囊压缩层结构。该支护结构可以实现围岩变形与衬砌变形的解耦,防止围岩变形过大造成衬砌结构破坏。基于弹性力学理论推导了高地应力、低地应力作用下气囊压缩层与衬砌联合支护的隧道应力场和位移场解析解,并利用数值模拟验证了理论解的可靠性。结果表明:低地应力时,围岩变形随着气囊压缩层厚度增大而增大,衬砌的变形和平衡压强随气囊压缩层厚度增加而减小,且该趋势随气囊压缩层厚度增加趋于平缓;高地应力时,支护抗力及衬砌变形受平衡压强控制,与气囊压缩层厚度无关;地应力较低时,气囊压缩层发挥增阻变形作用,初始压强为隧道变形的控制因素,围岩变形随地应力与初始压强的比值增大而增大,衬砌变形和平衡压强随之增大而减小;地应力较高时,气囊压缩层发挥增阻-恒阻变形作用,预设压强为隧道变形的控制因素,围岩变形随地应力与预设压强的比值增大而增大,衬砌变形随之增大而减小。该结构可以较好地适用于不同地质条件,对高地应力大变形隧道支护和低碳支护具有一定借鉴意义。In view of the large deformation disaster of surrounding rock that is prone to occur when a tunnel passes through complex geological environments,and considering the limitations of existing compressible layer support structures,the novel inflatable compression layer structure is proposed to effectively absorb the surrounding rock deformation energy and fully adjust the rock pressure distribution,as well as uniformly transmit the rock pressure to the lining structure.This support structure decouples the surrounding rock deformation from the lining deformation,preventing the excessive deformation of surrounding rock that may lead to the damage to lining structure.Considering the combined supports with inflatable compression layer and lining under the action of both high ground stress and low ground stress,the analytical solutions for tunnel stress field and displacement field were derived based on the elasticity theory.The result indicates that under low ground stress,the surrounding rock deformation increases with the thickness of inflatable compression layer,while the lining deformation and equilibrium pressure decrease with thickness increasing.This trend becomes more moderate as the inflatable compression layer thickness increasing.Under high ground stress,the support resistance and lining deformation are controlled by the equilibrium pressure,and are not related to the inflatable compression layer thickness.When the ground stress is low,the inflatable compression layer plays a role in increasing deformation resistance,and the initial pressure becomes the tunnel deformation controlling factor.The surrounding rock deformation increases with the ratio of ground stress to initial pressure,while the lining deformation and equilibrium pressure decrease with the ratio increasing.When the ground stress is high,the inflatable compression layer exhibits a role of increasing resistance and constant resistance to deformation,and the preset pressure becomes the tunnel deformation controlling factor.The surrounding rock def

关 键 词：隧道工程 新型支护设计 理论推导 参数分析 气囊压缩层 

分 类 号：U451[建筑科学—桥梁与隧道工程]