Abstract:
A study to determine the suitability of a lighter material,
such as 'burnt clay lump' which is can be made available localy,
to replace stone in bank protection work was taken up. The effect
of size and unit weight of materials in bank protection was
studied in laboratory in a straight channel using cubical blocks
made of sand-cement morter and brick. Saturated sand-cement bJ.ock
had a specific gravity of 2.68 resembleming that of stone and
brick blocks had a specific gravity of 2.18.
Critical velocity at faiJ.ure of the blocks used as bank
protective material was determined on four different side slopes.
The volume of blocks was found to vary with the velocity at
failure as the 6th and 7th power for sand-cement blocks and brick
blocks respectively. The weight of blo.cks was found to vary with
the velocity at failure as the 4.75th and 5.5th power for sand cement
blocks and brick blocks respectively.
It was observed that interlocking of the blocks and the
waves in the channel are also major factors in the determination
of proper size. of bank protective materials. It was also concluded
that on a flatter side slope blocks of much less weight are
required.
