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根据对山区深切峡谷大跨径桥梁岸坡稳定性的各种影响因素:地形地貌、地层岩性、岩体完整程度、结构面组合条件以及强度、水文地质条件、地震附加荷载、工程荷载进行了一一分析和评价。提出深切峡谷大桥自然陡岸坡防治等级应拟定为一级岸坡;提出适合岸坡稳定性评价方法与条件,分析方法有经典的刚体极限平衡法和可考虑应力-应变分布的数值分析方法,其中基于刚体假设考虑力平衡的有Bishop法、Ordinary法、Janbu法等和同时考虑力和力矩平衡的有Morgenstern-Prince法、Spence法、Samar法等,它们都有各自优缺点和适用条件;数值方法中提出了强度折减法计算分析岸坡稳定系数是切实可行的。提出了岸坡计算的各种工况和在这些工况下的计算荷载取值依据,以及岸坡安全控制的参考标准。通过以上一系列分析研究,从整体上把握山区深切峡谷大跨径桥梁岸坡稳定性评价技术,为深入研究该问题打下基础,具有重要的指导意义和巨大的经济意义。
According to various factors affecting the stability of slope of long-span canyon bridge in mountainous area: topography, stratigraphy lithology, rock mass integrity, structural plane combination and strength, hydrogeological conditions, seismic load and engineering load One by one analysis and evaluation. It is proposed that the grade of prevention and treatment of natural steep bank slope of deep canyon bridge should be formulated as first grade bank slope. The method and condition of bank slope stability assessment are proposed. The analytical methods include classical rigid body limit equilibrium method and numerical analysis method which can consider stress- The Bishop method, Ordinary method, Janbu method and so on which are based on the rigid body assumption for considering the force balance are the Morgenstern-Prince method, Spence method and Samar method, which have both the force and torque balance. Each has its own advantages, disadvantages and applicable conditions. In the method, it is feasible to calculate the slope stability coefficient by the method of strength reduction. Various operating conditions of bank slope calculation and calculation basis of load under these conditions are put forward as well as reference standards of bank slope safety control. Through a series of analysis and research above, it is of great guiding significance and great economic significance to master the slope stability evaluation technique of long-span canyon long-span bridge in mountainous area in order to lay a foundation for further study on this issue.