Mining engineering with layered structures often obtains extensive geological data to ensure reliability of mining operations. Effectively utilizing these data to characterize the spatial distribution of mechanical parameters in layered rock mass is crucial for slope stability analysis. This study focuses on the Heishan open-pit mine as a case study, leveraging the distinctive characteristics of mining engineering geological data. A three-dimensional fracture network was then generated based on the distribution of fractures in the rocks, and the representative elementary volume of the rock mass was determined by calculating the volumetric joint count (). Statistical characteristics of various geological data are analyzed, and a geological statistical method combining the Kriging method and inverse distance power method is applied to establish a spatial distribution block model for geological strength index (GSI) and rock mechanical properties. Subsequently, a spatial variability model of the mechanical parameters of the layered rock mass was generated based on the Hoek–Brown criterion. Furthermore, the heterogeneous mechanical model is implemented in numerical software for stability analysis and slope angle optimization. The findings indicate that each engineering zone of layered slopes exhibits unique mechanical parameters while demonstrating significant layered distribution patterns at a macro level. Considering spatial variability, the mechanical model significantly impacts slope stability and slope angle optimization outcomes. Our research methodology facilitates accurate quantification of the heterogeneity of mechanical parameters in layered slopes without incurring excessive additional survey costs, enabling more rational explanations of slope landslides and the provision of suitable slope angle optimization designs.

中文翻译：

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层状岩体力学参数空间变异建模及其在露天矿边坡优化中的应用


具有层状结构的采矿工程常常需要获取大量的地质数据，以确保采矿作业的可靠性。有效利用这些数据来表征层状岩体力学参数的空间分布对于边坡稳定性分析至关重要。本研究以黑山露天矿为例，利用采矿工程地质资料的鲜明特点。然后根据岩石中裂隙的分布生成三维裂隙网络，并通过计算体积节理数（）确定岩体的代表单元体积。分析各种地质数据的统计特征，采用克里格法和反距离幂法相结合的地质统计方法，建立地质强度指数（GSI）和岩石力学性质的空间分布块模型。随后，基于Hoek-Brown准则生成了层状岩体力学参数的空间变异模型。此外，异构力学模型在数值软件中实现，用于稳定性分析和坡度优化。研究结果表明，层状边坡的每个工程区都表现出独特的力学参数，同时在宏观层面上表现出显着的层状分布模式。考虑到空间变异性，力学模型显着影响边坡稳定性和边坡角度优化结果。 我们的研究方法有助于准确量化层状边坡力学参数的异质性，而不会产生过多的额外调查成本，从而能够对边坡滑坡进行更合理的解释并提供合适的边坡角度优化设计。