摘要：The vibrations induced by the passage of high-speed trains(HSTs)are considered a crucial issue in the field of environmental and geotechnical *** wave barriers have been investigated to reduce the detrimental effects of HST-induced *** study is focused on the potential implementation of an innovative mitigation technique to alleviate the developed *** particular,the use of expanded polystyrene(EPS)blocks as partial fill material of embankment slopes was *** efficiency of the proposed mitigation technique was numerically *** specifically,a 3 D soil-track model was developed to study the cross-section of a railway track,embankment,and the underlying soil *** passage of the HST,Thalys,was simulated using a moving load method,and the soil response was calculated at several distances from the *** parameters influenced the effectiveness of the examined mitigation ***,to ensure an optimal design,a robust procedure is necessary which considers the impact of these ***,the implementation of EPS blocks on several embankments with different geometry,in terms of height and slope angle,was investigated.

摘要：The adopted 2-D SSD （stopping sight distance） adequacy investigation in current design practice may lead to design deficiencies due to inaccurate calculation of the available sight distance. Although this concern has been identified by many research studies in the past, none of them suggested a comprehensive methodology to simulate from a 3-D perspective concurrently both the cross-section design and the vehicle dynamics in space during emergency braking conditions. The proposed methodology can accurately perform SSD adequacy investigation in any 3-D road environment where the ground, road and roadside elements are inserted by identifying areas of interrupted vision lines between driver and obstacle being less than the required distance necessary to bring the vehicle to a stop condition. The present approach provides flexibility among every road design and/or vehicle dynamic parameter inserted, as well as direct overview regarding design elements that restrict the driver＇s vision and create SSD inadequacies. As a result, precious guidance is provided to the designer for further alignment improvement but mostly an accurate aid to implement geometric design control criteria with respect to both existing as well as new road sections is delivered. The efficiency of the suggested methodology is demonstrated through a case study.