节理岩体中巷道围岩损伤演化与时效破坏研究
Study on Damage Evolution and Aging Failure of Roadway Surrounding Rock in Jointed Rock Mass
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摘要: 基于对岩石长期强度特征的认识，从岩石的强度、弹模等物理力学性质受环境影响随时间劣化以及岩石内部细观损伤积累的角度出发，通过引入岩体细观表征单元体的强度退化方程，应用RFPA数值分析方法，模拟了节理分布对巷道围岩的损伤演化和时效破坏机制的影响。在节理的影响下，巷道开挖后，围岩的应力分布规律发生明显的改变；节理为水平节理，巷道以两侧边墙片帮破坏为主；随着节理面倾角的变化，巷道围岩的时效损伤破坏模式也发生了明显的变化，巷道破坏区随节理倾角的增大相应旋转；当节理方向竖直时，巷道破坏主要集中于拱顶和拱底部位，出现了严重的冒顶和底鼓现象。同时，巷道周围围岩的位移也发生明显的变化，并且随着节理倾角的增大，巷道位移呈现出先增后减的大致趋势。Abstract: Based on the knowledge of long-term strength of rocks, the strength degradation equation is introduced in the representative volume element to study damage evolution and aging failure of rock surrounding roadway in jointed rock mass with different angles, by applying a numerical simulation method based on RFPA, in view of physical and mechanical properties of rock, strength and elasticity modulus and mesoscopic damage accumulation with time due to the influence of environmental variation. Distribution law of stress field of surrounding rock underground tunnel under the influence of weak interlayer is obviously changed. If the joint angle is 0°, tunnel is given priority to wall caving on both sides. With the change of joint angle, aging damage failure of rock surrounding underground tunnel is also changed obviously, and damage failure zone rotates with the increase of joint angle correspondingly. If the joint direction is vertical, the failure of tunnel focuses on the floor and the vault, with the serious phenomenon of roof caving and floor heave. Meanwhile, displacement of tunnel is obviously changed, and displacement of tunnel presents the general trend of first increase after decrease with the increase of joint angle.
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