隐伏型顺层高边坡深层滑剪破坏机理研究

High hidden dip slopes widely exist in natural and engineering environment. Its main failure modes are buckling failure, toppling failure and deep sliding-shear failure. Due to both the depth and size of the corresponding landslide are considerable, potential hazards of deep sliding-shear failure are more serious, which often happen without warning. Nonetheless, the induced factors and failure mechanism of high hidden dip slopes against deep sliding-shear failure are not well understood because of the complexity of the toe breakout. Based on the analysis of the geologic characteristics and disastrous causes of high hidden dip slopes in the known reference, the typical conceptualization geo-mechanical model of high hidden dip slopes that most prone to occur deep sliding-shear failure is to be established. Selecting granite mine slopes in Hunyuan County, Shanxi as the site for analysis, study on the mechanism of high hidden dip slopes against deep sliding-shear failure will be conducted through field investigation, laboratory tests (model testing), numerical simulation, theoretical analysis and engineering application verification. The mechanism of high hidden dip slopes against deep sliding-shear failure will be clarified and the controlling factors will be determined. Then, the analysis method of high hidden dip slopes against deep sliding-shear failure will be proposed. In addition, a special MATLAB code is developed for a quick stability assessment of the failures based on the proposed method. The project possesses significant theoretical and engineering application value to the prevention and control of landslide disasters of high hidden dip slopes.

隐伏型顺层高边坡广泛存在于自然环境和工程环境，常见失稳模式主要有溃屈破坏、倾倒破坏和深层滑剪破坏。其中，深层滑剪破坏对应的滑坡深度和规模大，且预兆不显著，故其潜在危害较前两类破坏方式往往大得多，又其诱发因素和破坏机理复杂，至今尚不清楚。本项目在分析已有文献中隐伏型顺层高边坡地质特征及成灾原因的基础上，依托山西浑源县花岗岩矿山隐伏型顺层高边坡稳定性研究，概化出最易发生深层滑剪破坏的隐伏型顺层高边坡的典型地质力学模型，通过现场调查、室内试验（模型试验）、数值模拟、理论分析和工程应用验证等手段，开展隐伏型顺层高边坡深层滑剪破坏机理的研究，揭示深层滑剪破坏机制，确定失稳控制因素和诱发条件，提出隐伏型顺层高边坡深层滑剪破坏的理论分析方法，并以MATLAB为平台编写计算程序，实现该类边坡深层滑剪破坏的快速评价。本项目将为防控隐伏型顺层高边坡滑坡灾害提供理论支撑，具有较高的理论意义和应用价值。

由于深度大、规模大，且发生前的征兆不明显，深层滑剪破坏是隐伏型顺层高边坡危害最大的一类破坏，给工程建设和人们的生命财产造成了严重的危害。本项目通过现场地质调查、模型试验、数值模拟和理论分析等综合研究手段，总结出了发生深层滑剪破坏的典型工程地质条件及变形破坏模式，提出了深层滑剪破坏发生的两类典型地质力学模型；弄清了陡倾和缓倾结构面参数（倾角、厚度、强度）、岩块强度及边坡高度等因素对深层滑剪破坏的影响，确定了失稳主控因素，揭示了破坏面的产生、发展及贯通机制，阐明了深层滑剪破坏机理；采用极限平衡方法和塑性摩擦理论，建立了“滑移-滑移”模型和“滑移-剪断”模型两种隐伏型顺层高边坡深层滑剪破坏分析方法。项目研究成果为防控隐伏型顺层高边坡滑坡灾害提供了理论支撑，具有十分重要的理论意义和应用价值。