Simple download service (Atom) of the dataset: N_ZONE_ALEA_PPRN_20140174_S_032

The mapping of the hay removal of clays in the commune of Augnax in the Gers department is extracted from the departmental mapping from the BRGM. This mapping is a zoning of the probability of occurrence of the phenomenon of shrink-inflating of clay soils. A susceptibility map was first drawn up on the basis of purely physical criteria by the BRGM from the geological maps of the department, which were interpreted taking into account the following factors for each geological formation: — the proportion of clay material within the formation (lithic analysis); — the proportion of blowing minerals in the clay phase (mineralogical composition); — the geotechnical behavior of the material. For each of the clay formations identified, the hazard level is ultimately the result of the level of susceptibility thus obtained with the density of sinister swelling, reported to 100 km² of actual urbanised outcropping surface.本数据集源自法国地质与矿产研究局（BRGM）编制的热尔省区域地质图件，对应奥尼亚克斯公社范围内黏土胀缩灾害的制图成果。该图件为黏土胀缩现象发生概率的分区图。法国地质与矿产研究局（BRGM）首先基于纯物理准则，依托该省地质图件编制了易发性图件，编图过程中针对每个地质地层，综合考量了以下要素： — 地层内黏土物质占比（岩相分析）； — 黏土相中膨胀性矿物占比（矿物组成分析）； — 岩土体的工程地质特性。 针对已识别的各黏土地层，最终的灾害等级由前述易发性等级结合按每100平方公里实际出露城市化地表统计的灾害性胀缩密度共同确定。