The stability of natural and artificial slopes is one of the main problems in geotechnics. The most common causes of landslides are the infiltration of rainwater and the consequent rise in the groundwater level. The analyzes of the slope stability are carried out to determine the occurrences and causes of instability, and dimensioning of remedial measures. The paper presents two tests carried out in the geotechnical laboratory at the Faculty of Civil Engineering in Rijeka as a part of the scientific research project Physical modelling of landslide remediation constructions behavior under static and seismic actions (ModLandRemSS), financed by the Croatian Science Foundation. The first model is a model of a slope built from fine-grained clean sand at a slope angle of 35° without remedial measures and in the second model has a gravity retaining wall incorporated as a remedial measure. Both models were subjected to similar conditions of artificial precipitation, and data on changes in the pore pressures and soil moisture in the model were collected during the experiment using the built-in sensors. While the basic model without built-in remedial measures, where slide and the development of instability were recorded from the foot towards the top of the model, showed almost no significant changes with respect the model of the slope tested with the retaining wall for the same load conditions. The test results are presented in detail in this paper and are used to perform model stability analyses.