N_ZONE_ALEA_PPRN_20140429_S_032

The mapping of the hay removal of clays in the commune of Loussous-Débat in the department of Gers 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.本数据集为热尔省卢苏-德巴市镇内黏土胀缩现象的编图，其源自法国地质矿业研究局（BRGM）编制的该省省域地质编图。该编图为胀缩性黏土的胀缩现象发生概率分区图。法国地质矿业研究局（BRGM）最初以纯物理准则为依据，基于该省地质图编制了易感性分区图，编制过程中针对各地质地层，综合考量了以下因素： — 地层内黏土物质占比（岩相分析）； — 黏土相内膨胀性矿物占比（矿物组成分析）； — 该物质的岩土工程特性。 针对已识别的各黏土地层，最终的灾害等级由上述易感性等级结合灾害性胀缩事件密度确定，该密度以每100平方公里实际出露的城市化地表为基准进行统计。