长大顺层边坡渐进滑移失稳演化机理研究

Research on evolvement of the progressive slide and failure mechanism of the long bedding slope

目前对长大顺层边坡在开挖过程中的变形与渐进破坏过程研究较少。因此,深入进行长大顺层边坡变形破坏机理的研究,能为边坡稳定性分析和治理提供重要依据。首先对长大顺层边坡进行定义,随后通过对长大顺层边坡进行数值分析,得到了长大顺层边坡滑面应力的基本特征,在此基础上分析得到了长大顺层边坡的渐进失稳演化机理。鉴于模型实验研究方法具有直观性的优点,研究中引入模型实验,并通过试验现象和675组试验数据分析,发现这类边坡的主要变形方式均为滑动变形,破坏模式为滑移—拉裂破坏,滑动过程为分级滑动。模型试验和数值分析均表明长大顺层边坡的破坏模式为渐进多次滑移拉裂失稳模式。

At present, there are few research on the process of deformation and progressive failure during long bedding slope excavation. Therefore, an in-depth study on stability of the long bedding slope is very important, and it can provide significant basis for stability analysis and prevention of bedding slope. The definition of the long bedding slope was given firstly. And the numerical simulation of the long bedding slope was carried out subsequently. The stress basic characteristics of the slip surface were obtained. On the basis of these results, the mechanism of the progressive failure of the long bedding slope was also achieved. Model test was introduced for its intuitive characteristics. After analyzing the phenomena and 675 groups of experimental data, it is found that the main mode of deformation is slippage, the mode of failure is sliding and tension fracture, and the process of slippage is graded. In conclusion, the mechanism of deformation and failure of the long bedding slope is progressive sliding and tensile fracturing process, which were verified both by the numerical simulation and the model tests.