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Slope mass rating-based analysis to assess rockfall hazard on Yogyakarta Southern Mountain, Indonesia

机译:基于坡度的分析分析评估日惹南部山区岩石危险

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摘要

In the Parangtritis Beach tourism area located in the Southern Mountain of Yogyakarta, karst hills were excavated to build the main accessing road and produce some of long and very steep slopes along the sides of the road. But still, there was none of the slope reinforcement installed along the road. Meanwhile, at several nearby locations within Southern Mountain, rockfall incidents have occurred many times even caused casualties. The potential of rockfall hazard also could be found in the main road of Parangtritis Beach as the study area. The purpose of this study is to determine the rockfall hazard assessment along the main road using Slope Mass Rating (SMR) analysis with the additional parameter of the slope height and the rock block size. The necessary data obtained by direct measurement and laboratory test. Geomechanics analysis, stereographic projection analysis, and hazard parameters weighting were carried out to produce the Rockfall Hazard Zonation Map of the study area. Based on 17 measurement stations, there are 4 (four) rockfall hazard classes in the study area, i.e., very low, low, moderate, and high. The class of very low, which also included road segments without slope, has the largest percentages of 83.83%, followed by the classes of moderate, low, and high with the percentage of 7.16%, 4.28%, and 4,19%, respectively. SMR was assumed as the most significant parameter that influences the rockfall hazard zonation. Historical rockfall points were overlaid over the Rockfall Hazard Zonation Map to validate the predicted hazard zones. Since 91.23% of the rockfall occurred in the moderate and high hazard classes, the zonation map considered reliable to predict future rockfall. This study also identified several landslide potential zones and provides the recommendation of slope reinforcement to be installed in the study area.
机译:在位于日惹南部山区的平原海滩旅游区,喀斯特山被挖掘成沿着道路侧面生产一些长而非常陡峭的斜坡。但仍然没有沿着道路安装的斜坡钢筋。与此同时,在南部山区的几个地点,落地事件发生了许多偶数造成伤亡。岩石危险的潜力也可以在致癌海滩的主要道路中找到作为研究区。本研究的目的是利用斜坡高度和岩石块尺寸的附加参数来确定沿着主道路沿着主道路确定岩石危险评估。通过直接测量和实验室测试获得的必要数据。进行地质力学分析,立体摄影分析和危险参数加权,以产生研究区域的岩石危险区划地图。基于17个测量站,研究区域中有4个(四个)岩石危险等级,即非常低,低,中等和高。非常低的班级,其中还包括没有坡度的道路段,其比例最大为83.83%,其次是中等,低,高,分别为7.16%,4.28%和4,19%的百分比。 SMR被认为是影响岩石危害区划的最重要参数。历史岩石点覆盖在岩石危险区划地图上,以验证预测的危险区域。由于91.23%的岩石发生在中等和高危险的课程中,因此分区地图认为可靠地预测未来的岩石。本研究还确定了几个滑坡潜在区域,并提供了坡度加固建议安装在研究区内。

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