Bouldery bed basically consists of bed material of heterogeneous size and shape that does not form a uniform bed stratification. In fact, the scour around bridge piers is governed by the bed material around its vicinity. Extreme care should be exercised to establish foundations at sufficient depth to prevent their undermining. Stability and economy of bridge piers is assessed based on the degree of certainty with which scour is assessed. Estimation of scour on bridge piers located in bouldery bed has been a challenge for bridge engineers. Construction of these foundations led to a time and cost overrun. Since there is no empirical/rational formula available in the literature, efforts have been made to collect the data from bridges already constructed on bouldery bed and their behavior has been observed for some time. Based on the data collection, statistical approach has been applied after duly considering the factor of safety. In the proposed formula, efforts have been made to relate the scour with velocity in the cross section of the river. In fact, velocity, when calculated according to the "Manning formula", takes into account all the characteristics of the cross section. Bouldery bed pier scour pattern based on observation, present practices being followed, and the proposed formula are discussed in this paper.


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Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: p. 896-909

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Filing Info

  • Accession Number: 00977068
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 6 2004 12:00AM