Abstract The purpose of this paper is to study the sliding failure of the jointed rock slope caused by the degradation of rock mass mechanics under dry-wet cycles. Based on the mechanical parameters of reservoir limestone obtained under different numbers of dry-wet cycles, a discrete element approach was adopted to analyze the slippage failure mode of HuangNanBei slope in the Three Gorges Reservoir Region. The Barton-Bandis nonlinear strength criterion for discontinuities was used to improve the Mohr-Coulomb (M-C) sliding model, and the modified M-C sliding model could make the shear strength parameters of the discontinuities change with the stress state. Under the modified model, there was a tendency for disintegration between blocks in the process of slippage, which was more in line with the actual working conditions and proved the validity and necessity of this model. Furthermore, the slip rate increased with the increase of dry-wet cycles, and the increase trend had not slowed down after 30 dry-wet cycles. The cumulative displacement from 0 to 30 dry-wet cycles was obtained by changing the mechanical parameters of the discontinuities every 10 steps to simulate each dry-wet cycle. The pattern of the cumulative displacement curve was consistent with the slip curve of the 30th dry-wet cycle, which indicated that the degradation of the rock mass mechanics is irreversible. Consequently, strengthening the hydro-fluctuation belt is of great significance for disaster prevention and control in the reservoir region.

中文翻译：

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三峡库区干湿循环下黄南北边坡滑移破坏分析

摘要 本文旨在研究干湿循环下岩体力学退化引起的节理岩质边坡滑动破坏。基于不同干湿循环次数下储层灰岩力学参数，采用离散元方法对三峡库区黄南北边坡滑移破坏模式进行分析。采用Barton-Bandis非线性强度准则对Mohr-Coulomb (MC)滑动模型进行改进，改进后的MC滑动模型可以使不连续点的剪切强度参数随应力状态而变化。修改后的模型下，在滑点过程中，区块之间有解体的趋势，更符合实际工况，证明了该模型的有效性和必要性。此外，滑移率随着干湿循环次数的增加而增加，并且在30次干湿循环后增加趋势没有减慢。通过每 10 步改变不连续性的机械参数以模拟每个干湿循环，获得从 0 到 30 次干湿循环的累积位移。累积位移曲线与第 30 次干湿循环的滑移曲线一致，表明岩体力学退化是不可逆的。因此，加强水涨落带对库区灾害防治具有重要意义。并且在 30 次干湿循环后，增长趋势并未放缓。通过每 10 步改变不连续性的机械参数以模拟每个干湿循环，获得从 0 到 30 次干湿循环的累积位移。累积位移曲线与第 30 次干湿循环的滑移曲线一致，表明岩体力学退化是不可逆的。因此，加强水涨落带对库区灾害防治具有重要意义。并且在 30 次干湿循环后，增长趋势并未放缓。通过每 10 步改变不连续性的机械参数以模拟每个干湿循环，获得从 0 到 30 次干湿循环的累积位移。累积位移曲线与第 30 次干湿循环的滑移曲线一致，表明岩体力学退化是不可逆的。因此，加强水涨落带对库区灾害防治具有重要意义。累积位移曲线与第 30 次干湿循环的滑移曲线一致，表明岩体力学退化是不可逆的。因此，加强水涨落带对库区灾害防治具有重要意义。累积位移曲线与第 30 次干湿循环的滑移曲线一致，表明岩体力学退化是不可逆的。因此，加强水涨落带对库区灾害防治具有重要意义。