Influence of cohesion on scour around bridge piers

Ansari, S. A.; Kothyari, Umesh C.; Raju, K. G. Ranga

doi:10.1080/00221680209499918

Cited by 85 publications

(46 citation statements)

References 13 publications

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“…For very fine material, having cohesion, it is generally considered that there will be greater resistance to scour and hence reduced scour depth will result. However, recent studies (Ansari et al 2002) on scour in cohesive material revealed that depending upon antecedent soil moisture and drainage conditions prevailing in cohesive soils, the scour in them can be less, equal or even more than that in cohesionless material under similar flow and pier conditions. These effects are not considered in the Lacey-Inglis method.…”

Section: Comments On Lacey's Methodsmentioning

confidence: 96%

Indian practice on estimation of scour around bridge piers—A comment

Kothyari

2007

Sadhana

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Well-laid foundation is mostly provided in road and railway bridges in India over large and medium-sized rivers. The age-old Lacey-Inglis method is used for estimation of the design scour depth around bridge elements such as pier, abutment, guide bank, spur and groyene. Codal provisions are seen to produce too large a scour depth around bridge elements resulting in bridge sub-structures that lead to increased construction costs. Limitations that exist in the codes of practice are illustrated in this paper using examples. The methods recently developed for estimation of the scour are described. New railway and road bridges are required to be built in large numbers in the near future across several rivers to strengthen such infrastructure in the country. It is strongly felt that provisions in the existing codes of practice for determination of design scour depth require immediate review. The present paper provides a critical note on the practices followed in India for estimating the design scour depth.

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Section: Comments On Lacey's Methodsmentioning

confidence: 96%

Indian practice on estimation of scour around bridge piers—A comment

Kothyari

2007

Sadhana

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“…In clay-sand-gravel mixture the sand and gravel were mixed in equal proportion by weight. The antecedent moisture content in the cohesive sediment has great influence on its physical properties (Ansari et al 2002). Depending upon the moisture content, the cohesive sediments change their stages, i.e.…”

Section: Properties Of Cohesive Sediment Mixturesmentioning

confidence: 99%

“…The erosion resistance was noticed to increase with the decrease of mean sediment size, increase of moist bulk density, and an increase of water content up to a certain level. Similar to Ansari et al (2002Ansari et al ( , 2003, the plasticity index, water content, and moist bulk density of the soil sample were used to parameterize the soil resistance against flow erosion. Note, however, that the plasticity index can not be measured for cohesive sediment mixtures containing gravel as is the present study.…”

Section: Review Of Literaturementioning

confidence: 99%

“…Thus, the functional form can be written as q sc,i q sc;i ¼ f ðq s;i ; P c ; d a ; C u ; u c ; u sh ; g d ; g w ; Dg s ; UCS 0 Þ (9) where C u and u c ¼ cohesion and angle of internal friction for clay constituent of sediment mixture at optimum moisture content and g d ¼ its dry density, u sh ¼ angle of repose/internal friction of cohesionless constituent sediment present in the mixture. The parameters P c , C u , u c , u sh , Dg s , d a can be expressed into dimensionless form as (Ansari et al 2002(Ansari et al , 2003)…”

Section: Dimensional Considerationsmentioning

confidence: 99%

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Influence of cohesion on suspended load transport of non-uniform sediments

Jain

Kothyari

2010

Journal of Hydraulic Research

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Experimental results are presented on suspended load transport rates of clay eroded from a channel bed made up of two types of cohesive sediment mixtures. The first mixture was prepared using fine gravel and clay with the clay proportion by weight varying from 10 to 50%. In the second mixture, equal proportions of fine gravel and fine sand were mixed with clay in proportions of 10 to 50%. Based on dimensional considerations a computational procedure was developed to estimate the rate of suspended load transport of the clay fraction eroded from the cohesive sediment mixtures. In the absence of cohesion, the proposed computational method transforms to a method for computation of suspended load transport rate of the cohesionless sediment mixtures. Studies on suspended load transport rates of cohesive sediment mixtures containing gravel as presented here were not reported so far in the literature to the best of our knowledge.

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“…Discharge is measured by applying the orifice meter discharge equation and taking the pressure difference at manometer in the upstream and downstream of the orifice meter. Depth of flow in the flume is measured by taking the difference between the bed level reading and the top water level during experiment [7].…”

Section: Discharge and Depth Of Measurementmentioning

confidence: 99%

Effect of Bridge Pier Geometry on Local Scouring

Roy¹

2017

IJEE

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Influence of cohesion on scour around bridge piers

Cited by 85 publications

References 13 publications

Indian practice on estimation of scour around bridge piers—A comment

Indian practice on estimation of scour around bridge piers—A comment

Influence of cohesion on suspended load transport of non-uniform sediments

Effect of Bridge Pier Geometry on Local Scouring

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