【摘要】 针对隧道塌方失稳问题 ,运用灾变理论建立隧道塌方失稳的尖点灾变模型。基于平衡曲面方程 ,可求得隧道围岩体内承载区介质刚度与对应的松弛区弱化介质本构曲线拐点处刚度之比值 K,并给出了塌方与否的判据 ,当 K≤ 1时 ,隧道将发生塌方失稳 ;当 K >1时 ,隧道将不会发生塌方失稳。根据此模型 ,笔者解释了隧道中几种常见的灾变破坏机理 ,并提出了相应的治理方案。更多还原

【Abstract】 On the basis of analyzing the mechanism of tunnel caving, a cusp catastrophic model is established in this paper. The rigidity ratio K can be derived from the model and the criteria for tunnel caving are given. When K≤1,the tunnel caving accident will be caused; But when K>1,the tunnel caving accident will not be caused. Several catastrophe mechanisms are explained and the dealing schemes are offered as well.更多还原