Dataset Direct Download Service (WFS): N_ZONE_ALEA_PPRN_20140162_S_032

The mapping of the hay removal of clays in the commune of Thoux 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.热尔省（Gers）图克斯（Thoux）公社内黏土胀缩灾害防治区划图源自法国地质矿业研究局（Bureau de Recherches Géologiques et Minières，BRGM）编制的省级地质制图成果。该区划图用于表征黏土胀缩现象的发生概率。法国地质矿业研究局最初依托该省地质图，以纯物理标准为依据编制了敏感性区划图，编制过程中针对每个地质构造综合考量了以下三类因素：一、该构造内黏土物质占比（岩性分析）；二、黏土相中膨胀性矿物占比（矿物组成分析）；三、该物质的岩土工程特性。针对每一处已识别的黏土构造，最终的危险等级由上述敏感性等级结合灾害性胀缩密度计算得出，该密度以每100平方公里实际出露的城市化地表面积为基准。