边坡水平卸荷裂隙的突变理论模型

将水平卸荷裂隙看作是一个包含软弱结构面和围岩的力学系统，在边坡形成过程中，结构面介质本构性质的软化会引起失稳现象，通过力学模型讨论了水平卸荷裂隙现象，该模型对应于突变理论的尖灭型（Ｃｕｓｐ）突变模型，从理论上分析了卸荷裂隙的突变条件，并提出了临界失稳点的位移值，该值对边坡的设计，施工方案，开挖以及长期运行的监测具有实际意义。

A Catastrophe Model on Horizontal Release Fractures

This paper considers horizontal release fractures as an unstable phenomen on produced by the softening of discontinuities in a mechanics system including discontinuities and surrounding rocks during the excavation of slopes. The horizontal release fractures are discussed through a simple mechanical model corresponding to the Cusp catastrophe model; the conditions and mechanism of sudden change of release fractures are studied as well. The displacement threshold of an instability point is given by the model, which is of importance in the design and excavation of slopes.