【摘要】 【研究目的】针对乐西高速沿线广泛存在的岩质边坡开挖扰动下的变形、破坏及加固过程稳定性问题，以ZK9+610～ZK9+755标段左侧顺层岩质边坡为研究对象，对其潜在变形破坏机理与动态施工稳定性进行分析。为边坡支护方案优化及施工管控提供支撑。【研究方法】通过现场地质调查和岩土体物理力学基础数据，基于FLAC 3D软件建立顺层岩质边坡三维数值计算模型，采用Mohr-Coulomb弹塑性准则，模拟开挖无支护、开挖无支护暴雨、分步开挖支护、开挖支护后暴雨几种典型工况，并结合现场GNSS地表位移监测数据验证模型可靠性。【研究结果】多步开挖无支护工况下，坡体中部会发生局部小规模失稳破坏，开挖无支护暴雨工况下，边坡变形量分布范围和变形量数值迅速增加，将发生大规模的失稳破坏；边坡潜在变形破坏机理为坡体表面岩土体在人类工程扰动、降雨作用、重力.作用和下部泥质软弱面的多重影响下发生的受前缘卸荷牵引，沿粉砂质泥岩中泥质软弱层滑移的滑移-拉裂模式；边坡开挖支护过程中及支护完成后的暴雨工况下，边坡整体和支护结构的位移量较小，安全系数始终处于1.2左右，稳定性较好。【结论】研究揭示了高速公路顺层岩质边坡的失稳模式，可为同类顺层岩质边坡灾害预判提供参考，锚索框架梁+抗滑桩板墙的支护体系，能有效保障边坡施工及暴雨工况下的稳定性。研究成果对乐西高速公路及川西高原梯度带类似边坡的动态施工与防护设计具有重要指导意义。更多还原

【Abstract】 [Objective] Regarding the widespread issues of deformation, failure, and stability during reinforcement of rock slopes under excavation disturbance along the Leshan-Xichang Expressway, this study takes the left bedding rock slope at section ZK9+610～ZK9+755 as the research object. It analyzes the potential deformation and failure mechanisms and the stability during dynamic construction, providing support for the optimization of slope support schemes and construction management.[Methods] Through field geological surveys and geotechnical physical-mechanical data, a three-dimensional numerical model of a bedding rock slope was established using FLAC3D software. The Mohr-Coulomb elastoplastic criterion was adopted to simulate several typical working conditions, including excavation without support, excavation without support under rainstorm conditions,step-by-step excavation with support, and post-excavation support under rainstorm conditions. The reliability of the model was verified by combining with on-site GNSS surface displacement monitoring data. [Results] The results show that local small-scale instability failure occurs in the middle of the slope under the multi-step excavation without support, and large-scale instability failure will occur under the excavation without support and heavy rainfall condition when the distribution range of slope deformation and the value of deformation increase rapidly; The potential deformation and failure mechanism of slope is a sliding tensile fracture mode in which the rock and soil mass on the surface of the slope are subjected to multiple influences such as human engineering disturbance,rainfall, gravity, and the lower muddy weak surface, and are pulled by the leading edge unloading force, sliding along the muddy weak layer in the sandy mudstone; During the slope excavation and support process and under the rainstorm working condition after the completion of the support structure, the displacement of the whole slope and the support structure is small, the safety coefficient is always about 1.2, and the stability is good. [Conclusions] The research reveals the failure modes of bedding rock slopes along expressways, which can provide references for predicting similar disasters in analogous slopes. The support system combining anchor cable frame beams and anti-slide pile-sheet walls effectively ensures slope stability during construction and under rainstorm conditions. The findings offer important guidance for the dynamic construction and protective design of similar slopes in the Leshan-Xichang Expressway and the western Sichuan plateau transition zone更多还原