ABSTRACT

The island of Gran Canaria (Canary Islands, Spain) is characterized by a large variability of volcanic rocks reflecting its volcanic evolution. The geological map provided by Geological Survey of Spain at 1:25.000 scale shows more than 109 different lithologies and it is too complex for environmental and engineering purposes. This work presents a simplified geotechnical map with a small number of classes grouping up units with similar geotechnical behaviours. The lithologies were grouped using about 350 rock samples, collected in the seven major islands of the Archipelago. The geotechnical map was used to model rockfall hazard in the entire island of Gran Canaria, where rockfalls are an important threat. The rockfall map was validated with 128 rockfall events along the GC-200 road, located in the NW sector of Gran Canaria. About 96% of the events occurred along sections of the road where the number of expected trajectories is high or moderate.

摘要

大加那利岛（西班牙加那利群岛）的特点是火山岩的多变性反映了火山的演化。西班牙地质调查局以1：25.000比例尺提供的地质图显示了109多种不同的岩性，对于环境和工程目的而言，它太复杂了。这项工作提供了一个简化的岩土地图，其中包含少量类别，将具有相似岩土行为的单元分组。根据在群岛的七个主要岛屿上收集的大约350个岩石样本对岩性进行了分组。岩土工程图被用来模拟整个大加那利岛的崩塌危害，那里的崩塌是一个重要的威胁。沿大加那利岛西北部GC-200公路沿线128处落石事件验证了落石图。