In order to prevent occupational accidents caused by landslide, the design of the structure must be based on the ground conditions. However, there are cases where the design cross-section is determined based on various guidelines, laws and regulations, and design guidelines, etc. without ground investigation. When considering the stability of a slope, it is necessary to determine the design cross-section considering the influence of water such as groundwater and springs as well as the excavation geometry. In this paper, centrifuge model experiments were carried out to simulate the slope shape specified in the Road Earth Construction Guideline and Ordinance on Industrial Safety and the Occupational Safety and Health Regulations Article No. 356, and to verify how the slope would fail due to groundwater rise. As a result, it was confirmed that the slope would be stable if there was no influence of the groundwater in the prescribed shape, but it was confirmed that the slope would collapse when the groundwater rises. In addition, a countermeasure for the drainage of groundwater by drainage pipes was investigated. The stability of the slope was improved by the drainage pipes installed only at the bottom of the slope.
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