UAV-mounted Ground Penetrating Radar: an example for the stability analysis of a mountain rock debris slope

This paper describes scientific research conducted to highlight the potential of an integrated GPR-UAV system in engineering-geological applications.The analysis focused on the stability of a natural scree slope in the Germanasca Valley,in the western Italian Alps.As a consequence of its steep shape and the related geological hazard,the study used different remote sensed methodologies such as UAV photogrammetry and geophysics survey by a GPR-drone integrated system.Furthermore,conventional in-situ surveys led to the collection of geological and geomorphological data.The use of the UAV-mounted GPR allowed us to investigate the bedrock depth under the detrital slope deposit,using a non-invasive technique able to conduct surveys on inaccessible areas prone to hazardous conditions for operators.The collected evidence and the results of the analysis highlighted the stability of the slope with Factors of Safety,verified in static conditions(i.e.,natural static condition and static condition with snow cover),slightly above the stability limit value of 1.On the contrary,the dynamic loading conditions(i.e.,seismic action applied)showed a Factor of Safety below the stability limit value.The UAV-mounted GPR represented an essential contribution to the surveys allowing the definition of the interface debris deposit-bedrock,which are useful to design the slope model and to evaluate the scree slope stability in different conditions.

非正规垃圾场垃圾体量估算研究

非正规垃圾场主要通过现场开挖钻探和测绘对垃圾体量进行勘查,该方法效率低成本高,出于经济效益考虑,钻孔数量往往较少,地下填埋垃圾体量估算准确性较差,导致后期存量垃圾整治成本提高。为了准确的估算垃圾体量,本文以海南澄迈某非正规垃圾场为例,提出了采用无人机结合工程钻探、探地雷达对非正规垃圾填场垃圾体量进行估算,探索替代钻探和测绘估算垃圾体量的高效方法。结果显示,无人机遥测垃圾总体量最大(13120m3),其次是现场测量及钻探计算的垃圾总体量(12900m3),地质雷达探测的垃圾总体量最小(12300m3),不同方法对垃圾体量估算值之间的变异系数为3.26%。无人机结合工程钻探及探地雷达可替代现场开挖钻探和测绘,在今后类似的填埋场体量估算中具有重要参考价值。