Pérez Jaimes, LuisaLuisaPérez JaimesGrabe, JürgenJürgenGrabe2026-08-112026-08-112026-08-11https://hdl.handle.net/11420/56166This dataset forms part of the experimental investigation of capillary collapse in granular soils. Capillary collapse is defined as an irreversible volumetric deformation triggered by an increase in the degree of saturation of partially saturated soils. The collapse behaviour is influenced by several interrelated factors, including the wetting conditions, the applied stress state, and the soil porosity. In particular, the presence of porous lignite particles has been shown to influence the collapse mechanism. Therefore, investigating soils with different lignite contents is important for assessing the extent of this effect. The experimental data provided in this dataset contribute to the characterisation of the mechanisms governing capillary collapse and provide a basis for investigating the relationships between bimodal porosity, water retention behaviour, wetting, and collapse in partially saturated granular soils.https://creativecommons.org/licenses/by/4.0/Granular MaterialWetting CollapseUnsaturated Soil MechanicsTechnology::624: Civil Engineering, Environmental Engineering::624.1: Structural Engineering::624.15: Geotechnical EngineeringDataset10.15480/882.15370Pérez Jaimes, LuisaLuisaPérez JaimesGrabe, JürgenJürgenGrabe10.15480/336.4394