洞室层裂屈曲岩爆的突变模型

A Catastrophe Model for Underground Chamber Rock Burst under Lamination Spallation Bucking

建立了洞室层裂屈曲岩爆的突变模型,得出了洞室层裂屈曲岩爆在准静态破坏条件下的演化规律。引入一个函数表征内层岩体对外层岩体的约束作用,使洞室层裂屈曲岩爆模型更接近实际,更能反映层裂屈曲岩爆的演化规律。此外,还建立了动力扰动下洞室层裂屈曲岩爆的非线性动力学模型。研究结果表明: 洞室层裂屈曲岩爆的演化过程复杂;洞室层裂屈曲岩爆与否,不仅取决于岩体的内因如几何尺寸和岩石的性质等,还取决于外部作用力的大小和方式;动力扰动与粘弹性层状结构岩体的响应存在着非线性关系;该模型对扰动频率非常敏感,扰动频率满足一定条件是动力扰动下洞室发生层裂屈曲岩爆的必要条件;而模型对扰动力幅反应不敏感;在动力扰动下,洞室层裂屈曲岩爆演化过程中,竖向压力起决定性作用。

A catastrophe model displaying the rock burst of the underground chamber under laminated buckling was established, the evolvement law on underground chamber rock burst under laminated buckling was found under the condition of quasi-static pressure. A function was introduced to demonstrate the restraint strength between rock mass layers in order that the model (agreed) with the reality. In addition, a nonlinear dynamics model for underground chamber rock burst under laminated spallation buckling stimulated by dynamic disturbance was established. The results show that whether the rock burst being occurred depends not only on the rock mass feature but also on the size and way of exterior loading. The relationship between dynamic disturbance and the response of viscous elastic rock mass layer is nonlinear. The model is sensitive to disturbance frequency which is an essential factor for rock burst occurrence, and is insensitive to disturbance amplitude. The vertical ground pressure plays a decisive role on the evolvement of underground chamber rock burst under laminated spallation buckling.