摘要
针对目前隧道健康诊断指标判据不统一的状况,采用室内相似模型试验,结合实际工程实例,对隧道支护结构衬砌减薄、衬砌背后存在不同尺寸空洞状态下围岩与支护结构的破坏规律以及围岩的极限承载能力进行研究。结果表明:隧道拱顶衬砌厚度和支护结构背后空洞深度对应的结构承载力曲线分别呈S型和反S型,根据速率变化可以将曲线划分为承载能力缓慢退化阶段、快速退化阶段和退化完成阶段,分别对应隧道的亚健康、病变和病危3个健康阶段;所给出的隧道衬砌厚度不足和背后空洞的单项指标健康判据是可靠的。
According to the non-unified present situation of the tunnel health criterion,using indoor similar model test and combining with engineering practice,authors studied the failure law of surrounding rock and supporting structure and ultimate bearing capacity of surrounding rock in the state of lining thickness deficiency and various size cavities.The results show that the bearing capacity curves corresponded to tunnel vault lining thickness and cavity depth behind support structure separately express S and reverse S characteristics.The curves can be divided into slow,fast and complete degradation stage on basis of the variety of velocity,and it is uniform to the health grades of the sub-health,disease and sick into death.The given single health criterions of tunnel lining thickness deficiency and cavity are reliable.
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
2011年第4期70-79,共10页
China Journal of Highway and Transport
基金
重庆市自然科学基金重点项目(2008BA0015)
关键词
隧道工程
隧道健康判据
模型试验
空洞
衬砌厚度
tunnel engineering
tunnel health criterion
model test
cavity
lining thickness
