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以锦屏二级水电站TBM开挖的圆形断面施工排水洞为例,首先根据围岩实际破坏特性明确指出围岩劈裂后产生弧形岩板的客观存在性,然后提出其存在发生凹曲变形(指其发生弯曲方向指向隧洞外部、半径减小即曲率增大的弯曲变形)的可能性,最后从力学分析与数值试验两个方面对弧形岩板发生凹曲变形的可能性进行了论证。论证显示:对处于垂直地应力与水平地应力不相等条件下的深埋圆形隧洞,弧形岩板可以发生凹曲变形,发生的控制因素是两向应力差对圆形隧洞产生的垂直方向压缩、水平方向拉伸的压扁作用。弧形岩板凹曲变形的论证对今后深入认识深埋圆形隧洞完整或较完整硬岩动力破坏的发生机制提供了一条新思路。
Taking the circular section construction drainage tunnel of TBM excavation in Jinping II Hydropower Station as an example, the objective existence of curved rock slab after the splitting of the surrounding rock is clearly pointed out based on the actual failure characteristics of the surrounding rock. Then, Deformation (refer to the bending direction of the tunnel pointing to the outside, the radius decreases, ie, the curvature increases the bending deformation), and finally from the mechanical analysis and numerical test of two aspects of the concave curved plate curved deformation possibility Argument Demonstration shows that for deep buried circular tunnels with vertical stress and horizontal stress not equal, the concave curved deformation can occur in the curved rock slab. The controlling factor is the vertical direction of the circular tunnel Compression, flattening horizontal stretch. Demonstration of the concave curved deformation of the arc-shaped rock slab provides a new idea for further understanding of the mechanism of dynamic failure of the intact or more intact hard rock of the deep circular tunnel.