This paper presents a methodology for estimating rockfall threats in carbonate rock cuts along railways in Croatia. The assessment is based on the Rockfall Hazard Rating System (RHRS). In general, the RHRS versions developed for Tennessee and Colorado are combined and modified to comply with Croatian carbonate rock mass properties, specific geological environments and values measured in the investigation area. The modifications are related to the classification parameters and corresponding adjustments of their classes. The exponential scoring of parameter classes is retained, but the calculation of final rockfall threat classes is modified. The proposed methodology is developed and applied to 366 cut segments along railways with a total length of 74.888 km. All rock cuts are located in the Dinaric karst area of Croatia, where carbonate rocks are locally susceptible to rockfalls, which mostly include sliding, toppling and ravelling. Rockfall threat is calculated for each cut segment with 15 different scoring models. The optimal scoring model is chosen according to the verification results. The verification is based on three different verification parameters: preliminary rockfall threat assessment, rockfall scars and cut stability, which are defined by the Regional Maintenance Administration of Croatian Railways. An ordinal logistic regression is performed to determine the threshold values for each rockfall threat class. The established methodology is used to detect the most vulnerable railway sections, which are selected for detailed inspection and reclamation. The research also enables a proactive approach of rockfall management along linear infrastructure in Croatia but also worldwide in similar geological environments.

本文介绍了一种估算克罗地亚铁路沿线碳酸盐岩切割中的崩塌威胁的方法。该评估基于Rockfall危害评估系统（RHRS）。一般而言，为田纳西州和科罗拉多州开发的RHRS版本经过组合和修改，以符合克罗地亚碳酸盐岩的岩体特性，特定的地质环境和在研究区域中测得的值。修改与分类参数及其类别的相应调整有关。保留了参数类别的指数评分，但修改了最终落石威胁类别的计算。拟议的方法已开发并应用于沿铁路的366个切段，总长度为74.888 km。所有切石都位于克罗地亚的迪纳里克喀斯特地区，碳酸盐岩在当地容易发生崩塌，主要包括滑动，倾覆和崩塌。使用15种不同的评分模型为每个切割段计算落石威胁。根据验证结果选择最佳评分模型。验证基于三个不同的验证参数：初步岩崩威胁评估，岩崩伤痕和切割稳定性，这由克罗地亚铁路地区维护管理局定义。执行序数逻辑回归以确定每个岩崩威胁类别的阈值。既定的方法用于检测最脆弱的铁路路段，并选择这些路段进行详细的检查和填海。