Mapping of the alump removal of clays in the commune of Roquelaure-Saint-Aubin (Gers)

The mapping of the hay removal of clays in the commune of Roquelaure-Saint-Aubin in the Gers department is extracted from the departmental mapping derived 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.

本数据集提取自法国热尔省罗克洛尔-圣欧班公社范围内的黏土胀缩性制图成果，该成果源自法国地质矿产调查局（BRGM）编制的省级地质制图。该制图为黏土土壤胀缩现象发生概率的分区图。法国地质矿产调查局（BRGM）最初以该省地质图为基础，基于纯物理标准编制了敏感性制图，编制过程中针对每个地质单元，综合考量了以下因素：
— 地层内黏土物质的占比（岩相分析）；
— 黏土相内膨胀性矿物的占比（矿物组成）；
— 该材料的岩土工程性状。
针对已识别的每个黏土地层，最终的灾害等级由前述得到的敏感性等级结合有害胀缩密度计算得出，该密度以每100平方公里实际出露的已城市化地表面积为基准进行归一化。