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反倾岩坡的结构面倾向与边坡倾向相反,通常认为反倾岩坡的稳定性较强,因此相对于顺倾向坡而言,对反倾岩坡的研究较少,但工程实例表明对反倾边坡的稳定性研究意义重大。当反倾岩坡中有软弱岩层时,软弱结构面会对坡体变形产生影响,因此借助内、外观测成果对一具有软弱夹层的反倾岩坡进行研究,对其变形特征和变形机制进行分析。研究结果表明边坡在开挖过程中变形呈现“点头”现象,且在边坡变形体后缘出现拉裂缝。由于存在较厚的软弱层,坡体在倾倒变形的同时对软弱岩层压缩产生压缩蠕变,所以坡体整体变形模式为压缩-蠕变、倾倒-拉裂复合模式。软弱岩层对坡体变形具有一定控制作用,支护效果说明对穿锚索可以有效地约束坡体变形。
The structural plane inclination of anti-dumping slope is opposite to that of the slope, so it is generally considered that the anti-dumping slope is more stable. Therefore, there is less research on anti-dumping slope relative to forward-inclined slope. However, The stability of anti-dip slope is of great significance. When there are weak rock strata in the anti-dumping slope, the weak structural plane will affect the deformation of the slope. Therefore, based on the results of internal and external observation, an anti-dip slope with weak intercalations is studied and the deformation characteristics and deformation mechanism are analyzed . The results show that the deformation of the slope shows “nodding ” during the excavation process, and the crack appears on the trailing edge of the slope deformation body. Due to the existence of thicker and weaker layers, the slope body compresses and compresses the soft rock formation while compressing and creeping. Therefore, the overall deformation mode of the slope body is the compression-creep, pour-fracture combination mode. The weak rock layer has certain control effect on the slope deformation, and the supporting effect shows that the deformation of the slope can be effectively restrained by the anchor cable.