基于阶梯式渐进破坏的开挖顺层斜坡失稳范围计算方法

doi:10.3724/1000-6915.jrme.2024.0435

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摘要阶梯状渐进破坏为顺层岩质边坡失稳的典型破坏模式，而传统的计算方法通常忽略了顺层岩质边坡应变软化后阶梯式渐进破坏过程。为研究顺层岩质边坡破坏模式、破坏范围及稳定状态，首先基于极限平衡理论，引入岩石节理面非线性Barton-Bandis破坏准则，并考虑坡体后缘基岩裂隙水力作用，计算自由表面折线型滑面顺层岩质边坡失稳模式下欠稳定区范围。基于开挖松动区剪应力重分布模型，依据滑动面上剪应力与岩体峰值强度及残余强度的判别，判定出开挖岩质边坡不同破坏模式，其中包括渐进式破坏模式及阶梯状滑面多级多块体破坏模式，给出相对应的破坏范围及稳定系数Fs计算方法，从而判定坡体稳定状态，为防护设计提供支撑。结果表明：结构面有效抗压强度JCS、结构面粗糙度系数JRC、岩层倾角、节理裂隙倾角、峰值抗剪强度、残余抗剪强度及其残峰比是渐进破坏范围的主要影响因素；与岩层倾角、抗剪强度残峰比呈正相关，与JCS、JRC、峰值及残余抗剪强度、节理裂隙倾角呈负相关，其中峰值内摩擦角对计算结果影响相对较大。提出的理论计算方法与工程实例及三维离散元数值模拟得到的破坏范围及稳定系数Fs偏差在8%以内，该方法能对顺层岩质边坡阶梯式渐进破坏模式进行合理计算分析，可为相关研究及工程设计提供参考。

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	杜兆萌
	刘天翔
	程强

关键词 ：边坡工程, 顺层岩质边坡, 渐进式破坏, 阶梯式滑面, 水力作用

Abstract：The traditional stability calculation method for bedding rock slopes mainly simplifies the slope into a plane sliding-tensile fracture failure model，conducting overall stress analysis. However，it neglects the progressive failure process along the polygonal sliding surface during the failure of bedding rock slopes. Study the failure mode，scope，and stability state of bedding rock slopes. Based on the limit equilibrium theory，the nonlinear Barton-Bandis failure criterion for rock joint surfaces was introduced. Considering the hydraulic action of bedrock fractures at the rear edge of the slope，the instability range of polygonal sliding surface bedding rock slope under the instability mode is calculated. Based on the redistribution model of shear stress in the excavation loose area，and according to the determination of shear stress on the sliding surface and the peak strength and residual strength of rock mass，identify different failure modes of excavated rock slopes. It includes progressive failure mode and multi-stage multi-block failure mode with stepped sliding surfaces. Provide corresponding failure ranges and calculation methods for stability coefficient Fs to determine the stability state of the slope. The results demonstrate that the theoretical calculation method proposed in this study aligns well with the failure extents and stability coefficient Fs obtained from engineering examples and three-dimensional discrete element numerical simulations. The theoretical calculation method is capable of reasonably analyzing the progressive failure mode of bedding rock slopes along folded sliding surfaces. Therefore，it provides valuable reference for related research.

Key words： slope engineering bedding rock slope progressive destruction polygonal sliding surface water pressure

引用本文:

杜兆萌，刘天翔，程强. 基于阶梯式渐进破坏的开挖顺层斜坡失稳范围计算方法[J]. 岩石力学与工程学报, 2025, 44(S1): 171-182.
DU Zhaomeng，LIU Tianxiang，CHENG Qiang. Calculation method for the instability range of excavated bedding-rock slopes based on stepwise progressive failure. , 2025, 44(S1): 171-182.

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https://rockmech.whrsm.ac.cn/CN/10.3724/1000-6915.jrme.2024.0435 或 https://rockmech.whrsm.ac.cn/CN/Y2025/V44/IS1/171

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