Map Viewing Service (WMS) of the dataset: Mining Basins in Bouches-du-Rhône

Given the nature of the underground work carried out on the coal basin as a whole, several types of ground movements can be identified: . the collapse: this type of movement is usually manifested by the sudden surface appearance of a collapse crater whose geometric characteristics depend on the deep initiator phenomenon and the behavior of the underlying terrain. . of subsidence: it corresponds classically to a flexible movement or breaks to the right of underground work, it is manifested by the appearance of depression in the form of bowls often overflowing from the strict grip of the work accompanied by fractures for the brittle hazard. . earth-moving: this type of movement is characterised by a re-compaction of a locally furnished solid or affected by underground work linked to major variations in environmental conditions or overload. Earthworks may appear above underground areas, depot works, discoveries and the right of backfilled works. . slipping: there are usually superficial shifts, affecting small volumes (e.g. rigoles of rinsing, dandruff slides, etc.) and deep slides that may involve large volumes. They require that the deposition works have sufficiently large slopes. The studies carried out by INRIS in the context of the French Charbonnage files revealed that the large-scale stability of all the heaps was ensured: the expected disorders are therefore similar to superficial landslides, the intensity of which is generally limited to a few exceptions. Heating and flooding (at the level of the heaps) identified in the mining sectors can also be added.鉴于整体煤田地下作业的特性，可识别出四类地表移动变形： - 塌陷（collapse）：此类移动通常表现为地表突然出现塌陷坑，其几何特征取决于深部引发源现象与下伏地层的性状。 - 沉降（subsidence）：典型对应地下作业引发的柔性变形或脆性破裂，表现为碗状洼地的形成，其影响范围常超出作业区的严格管控边界，同时伴随脆性断裂风险。 - 土体移动（earth-moving）：此类移动的特征为受地下作业影响的局部松散或扰动土体发生重新压实，该现象与环境条件的显著变化或荷载过载密切相关。地下作业区、堆场、采掘区域以及充填作业区上方均可能出现土体移动现象。 - 滑移（sliding）：通常分为浅层滑移与深层滑移两类：前者影响体积较小（如冲洗渠、碎屑滑坡等），后者可涉及大规模岩土体体积。滑移发生的前提是堆积体具备足够大的坡度。法国国家工业安全与风险预防研究所（INRIS）针对法国采煤档案开展的研究表明，所有堆积体的整体稳定性均得到保障：因此预期的灾害类型与浅层滑坡类似，其强度通常仅存在少数例外情况。 此外，采矿区域内已识别的矸石堆发热与积水问题，亦可纳入本次研究范畴。