Laboratory study of the effect of cable and abutment in reducing the scour of the cylindrical bridge pier

Subject Areas : hydraulic structures

mohsen solimani babarsad ¹ , Reza Ghasemi ² , Rahman Doosti ³

1 - Assistant professor
2 - Water Science Dep, Shoushtar branch, Islamic Azad University, Shoushtar, Iran
3 - Master of Geological Remote Sensing, Islamic Azad University, Khorramabad Branch

Received: 2021-04-18 Accepted : 2021-08-22 Published : 2021-05-22

Keywords: cable, Scour, Bridge pier, Sill,

Abstract :

Local scouring around the bridge piers is one of the causes of their destruction. Therefore, in order to reduce and control this phenomenon, extensive research has been done and solutions in this regard have been presented. These solutions consist of two parts, direct and indirect, which in this study by defining scenarios, reviewing both methods and their simultaneous impact was done. In this study, the method of using cable, which changes the flow pattern around the base, was considered as an indirect and groundwater method that causes the flow lines to deviate from the substrate, as a direct method. Therefore, different states of the foundation, in front of the base, behind the base and the cable around the base with relative steps equal to 0.33, 0.5 and 0.67 in clear water conditions were investigated. According to comparative experiments, the use of a waterfront in the front results in an average scouring depth of 15 to 20% less than a footstool in the back of the base. Therefore, in general, according to the diagrams, it can be concluded that the combined use of cable and groundwater has reduced the scour depth and is accepted as a method of reducing the base scour depth.