Foundation depth and arrangement, Civil Engineering

Foundation Depth and Arrangement:

There are two types of foundations, viz,

(a) Shallow foundations, also known as open foundations, and

(b) Deep foundations.

Slab culverts and small bridges are generally provided with shallow foundations. Even for large bridges, if good rocky strata are met with at shallow depths, open foundations are adequate. If the strata are erodible, open foundations can be protected by providing impermeable flooring protected by cut-off walls (Figure 3).

313_Foundation Depth and Arrangement.png

Figure: General Arrangement of Floor Protection Works

Deep foundations are generally made of wells for rivers. For land structures, pile foundations are adopted. For erodible beds (such as alluvial streams), the foundations should be taken to a depth below the maximum high flood level equal to 1.33 times the maximum scour depth. The scour depth is calculated from the Lacey's formula:

D = 0.473 Q 1/3/f1/ 3

where D = Scour depth in m,

Q = Discharge in cu m per sec, and

f = silt factor, equal to 1.76 √m, where m is the mean diameter of the particles in mm.

Posted Date: 1/22/2013 6:49:49 AM | Location : United States







Related Discussions:- Foundation depth and arrangement, Assignment Help, Ask Question on Foundation depth and arrangement, Get Answer, Expert's Help, Foundation depth and arrangement Discussions

Write discussion on Foundation depth and arrangement
Your posts are moderated
Related Questions
Role of Each Mode of Transport: Each mode of transport has its own role to play in a country. The role of each is as under: Roads : Road transport carries 80 per cent of

Poisson distribution function: Let X I , X 2 , ..., X,& b e n independently and identically distributed random variables each having the same cdf F ( x ). What is the pdf of t

Classification of beam

Q. Coating on concrete – complete im-permeability to moisture? In designing protective coating on concrete structures, stoppage of water ingress by the coating is generally req

tracing paper method for solving three point problem?

Explain the Suppressed Rectangular Weir If the length of the weir (b) equals the width of the channel, i.e., the flow is not "contracted".

A contractor will place 90-cubic yards of concrete for a housekeeping pad on the rooftop of a 36-ft tall building. Site conditions dictate that the safest and best method of placem


Q. Can you explain Permeable Spurs? A permeable spur may be constructed by driving two or more rows of bally piles with sufficient penetration below riverbed level to provide a

Chemical Classification On the basis of their chemical composition engineers prefer to classify  rocks as: 1.    Silicious rocks 2.    Argillaceous rocks 3.    Calcare