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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。
Aiming at the current situation that the criterion of tunnel health diagnosis is not uniform, indoor similar model test and actual engineering example are used to reduce the lining of tunnel supporting structure and the rupture law of surrounding rock and supporting structure with different size holes behind the lining As well as the ultimate bearing capacity of surrounding rock. The results show that the curves of the tunnel lining thickness and the supporting structure behind the supporting structure are S-shaped and S-shaped, respectively. According to the rate change, the curves can be divided into the slowly degenerating stage, the rapid degenerating stage and the degeneracy Stage respectively correspond to three healthy stages of sub-health, disease and critically ill condition of the tunnel; the given health criterion of insufficient thickness of tunnel lining and single indicator behind the hole is reliable.