N_ZONE_ALEA_PPRN_20140338_S_032

The mapping of the hay removal of clays in the commune of Mauroux in the department of Gers 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.本次数据集涵盖盖尔省（Gers）莫鲁市镇（Mauroux）范围内粘土胀缩现象的相关图件，该图件源自法国地质和矿业研究局（BRGM）编制的省级图件。本图件为粘土土壤胀缩（shrink-inflating）现象发生概率的分区图。法国地质和矿业研究局（BRGM）最初基于纯物理标准，以该省地质图为基础编制了敏感性图，编制过程中针对每个地质地层，综合考量了以下因素： — 地层内粘土物质的占比（岩相分析）； — 粘土相内胀缩性矿物的占比（矿物组成分析）； — 该物质的岩土工程特性。 针对每一个已识别的粘土地层，最终的危险等级由前述敏感性等级与有害胀缩发生密度结合得出，其中密度按每100平方公里实际出露的城市化地表面积进行归一化计算。