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Bridge Failures -Lessons learned هرآنچه که باید در مورد فرو ریزش پلها بدانیم University at Buffalo 2010 فایل پی دی اف در 58 اسلاید منبع فروریزش پل ها .pdf

Study of slope stability and failure process of rock-fill barriers Original Article, C23 Ghaderi Nasab F, Amiri Tokaldany E, DavoudiM.H. Journal. Civil Eng. Urban. 3(4):142-149. 2013 ABSTRACT:A rock-fill barrier is an economical and effective structure for flood routing as well as stabilizing river bed and banks. Rock-fill barrier is a permeable and flexible structure and could resist against forces due to flow through and over flow from this structure. This study was carried out to investigate the failure process and providing criteria for slope stability of rock-fill barriers. Eighty-eight laboratory tests were performed in a flume with a longitudinal slope of 0.003 m/m, width of 0.6m, height of 0.8m and length of 14 m. A dimensional analysis technique was used to develop equations for calculating values of depth of flow in the upstream side of the barrier, the maximum flow under which a barrier remains stable, and evaluation for downstream stability of side slopes in terms of discharge, gradation of material, standard deviation of material size and upstream and downstream water depths. Data from laboratory tests were used to evaluate the results of the new equations. Using the criteria of mean relative error and root-mean-square error, it is found that there is a good accuracy of the equations introduced in this research. Keywords: Stability, Failure, Previous Barrier, Flood Control, Through-Flow And Over Flow Capacity منبع: [Hidden Content] دانلود: [Hidden Content].,23-142-149.pdf J. Civil Eng. Urban.,23-142-149.pdf