Wahyudi, Agus Hari (2021) PELINDUNG TEBING BATU BATA INTERLOCK DENGAN PERKUATAN TANAMAN AKAR WANGI GUNA MENDUKUNG PROSES RESTORASI SUNGAI. Doctoral thesis, UNDIP.

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Abstract

The problem of river bank damage due to erosion and landslides often occurs in Indonesia. To
repair of river bank damage is mostly done by building infrastructure in the form of groves,
revetments, linings, retaining walls, sheet piles and rip-rap stones or concrete blocks.
Rehabilitation can also use lives trees, lives stakes, creeping branches, planting seeds (Seeding
and seed sprying) and grass plants. River bank protection efforts with plants are more
environmentally friendly in accordance with river restoration activities. One of the goals of river
restoration is to form a more natural river segment. Trial of piles of rip-rap stones or concrete
blocks with grass plants between stones or concrete blocks has many advantages from an
ecological aspect. The weakness of the trial is that there is still no unity between construction
materials and plants. This study aims to develope interlock bricks made from burnt clay as river
bank protection and to find the effect of vetiver root plants (Vetivera zizanoides) in strengthening
the stability of brick river bank protection into a hybrid construction.
The method in this research is experimental with laboratory tests and prototype tests in the field.
Research in the laboratory to find out the technical specifications of bricks and find procedures
for arranging bricks. Research in the field to find the ability to withstand flow velocity, the
strength of vetiver plants, and the effect of buildings on the river ecosystem.
The results of the study found the shape of interlock bricks that can be combined with vetiver
plants equipped with holes in the middle of the height of the brick. The dimensions of the bricks
are 25 x 12,5 x 10 cm with the diameter of the top two holes being 5 cm while the diameter of the
side holes is 3,75cm. The function of the hole is for the growth of plant roots so that they can bind
the brick material to one another. The density of the conditions without holes filled with soil bricks
is 1,196 tons/m3 in wet conditions with holes filled with soil is 1,677 tons/m3, the ability to
withstand pressure from above is 42.33 kg/cm2, the ability of the holes in tensile strength is 37.32
kg/cm2, the value of Cohesion and internal shear angles for soil-filled bricks are soil Cb‘ = 0.599
kg/cm2 and Øb‘ = 34.606o, brick holes filled with vetiver content 6 months old Cv6‘ = 0.638 and
Øv6’ = 36.38o, and brick holes filled with vetiver for 12 months, Cv12’ = 0.734 kg/cm2 and Øv12’ =
43,32o. The maximum measurable flow rate in the field is 3.3 m/s. The condition of the river
segment ecosystem before and after the construction of the river bank protecion did not change.
This hybrid river bank protection has proven to be more natural and can support the river
restoration process.
Keyword: hybrid river bank protection, interlock brick, vetiver, river restoration.

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