CD Tesis

Kajian Perbaikan Tanah Dengan Prefabricated Vertical Drain (Pvd) Dan Vacuum Consolidation Pada Tanah Lempung Provinsi Jambi

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Increased air traffic at Sultan Thaha Syaifuddin Airport (Sultan Thaha
Airport) located in Jambi City, Jambi Province and managed by PT. Angkasa
Pura II occurs every year. PT. Angkasa Pura II plans to increase the ability of
Sultan Thaha Airport to be able to serve wide-body aircraft by increasing the
length and width of the runway with the current size of 2.220 meters long and 30
meters wide to 2.610 meters long and 45 meters wide. Based on the soil
investigation carried out, for subgrade surface (0 - 2 m depth) obtained N-SPT ≤
10 with the type of clay soil. Clay soils have high swelling and shrinkage, slow
consolidation processes, and low bearing capacity, so it is feared that the
subgrade will not be able to carry the load above it. Based on these conditions, a
solution is needed in the form of soil improvement. Soil improvement methods that
can be used as an alternative are Prefabricated Vertical Drain (PVD) Preloading
and Vacuum Consolidation. The expected objectives of this research are to
determine the carrying capacity of the surface soil, the amount of consolidation
and the length of time to consolidate before the repair is carried out, to determine
the results of soil improvement if it is carried out with the PVD Preloading and
Vacuum Consolidation methods which are calculated theoretically (manually)
and to determine changes the value of the carrying capacity of the land, the
amount of consolidation and the length of time required for consolidation after
repairs are carried out.
The research was conducted with stages starting from secondary data
collection (in the form of soil testing data in the field, laboratory testing, and
drilling work layout), analysis of subgrade parameters, soil improvement
planning using PVD Preloading and Vacuum Consolidation methods, calculation
of surface soil bearing capacity, results, and discussion. In analyzing this study,
several variations were used, including taking into account the smear effect and
without the smear effect, the installation pattern, namely the triangle pattern and
the rectangular pattern, and the different installation distances for PVD, namely 1
m, 1,2 m, and 1,4 m. All these variations were carried out for the two soil
improvement methods used.
Based on the analysis carried out on subgrade before repair, it is found
that the consolidation time to achieve a consolidation degree of 90% in zone 2 is
46,35 years, in zone 3 is 19,11 years and in zone 4 is 11,50 years. With the
obtained consolidation time conditions, it can be stated that the runway extension
area to be built in zone 2, zone 3, and zone 4 requires soil improvement to
accelerate land consolidation. After repairing the soil with PVD Preloading, the
surface soil bearing capacity was obtained at 312,8 kN/m2 in zone 2, amounting
to 301,6 kN/m2 in zone 3 and 43,5 kN/m2 in zone 4. The fastest time of
consolidation to reach the 90% degree of consolidation in each zone occurs in a
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triangle pattern with an installation distance (s) of 1 m, while the decrease in
consolidation that occurs obtains the same value to reach the 90% degree of
consolidation. In zone 2, for the 90% degree of consolidation, there is a decrease
of 1,42 m with a consolidation time of 68,04 days without the smear effect and
376,42 days with the smear effect. In zone 3, for the 90% degree of consolidation,
there is a decrease of 1,44 m with a consolidation time of 21,05 days without the
smear effect and 125,29 days with the smear effect. In zone 4, for the 90% degree
of consolidation, a decrease of 0,75 m is obtained with a consolidation time of
30,14 days without the smear effect and 160,00 days with a smear effect. By
carrying out soil improvements with vacuum consolidation, the surface soil
bearing capacity is obtained of 377,17 kN/m2 in zone 2, of 366,97 kN/m2 in zone 3
and of 107,90 kN/m2 in zone 4. The fastest time for consolidation to reach a 90%
degree of consolidation in each zone occurs in a triangle pattern with an
installation distance (s) of 1 m, while the decrease in consolidation that occurs
obtains the same value to achieve a 90% degree of consolidation. In zone 2, for
the 90% degree of consolidation, there is a decrease of 1,97 m with a
consolidation time of 68,04 days without the smear effect and 376,42 days with
the smear effect. In zone 3, for the 90% degree of consolidation, there is a
decrease of 2,48 m with a consolidation time of 21,05 days without the smear
effect and 125,29 days with the smear effect. In zone 4, for the degree of
consolidation 90%, there is a decrease of 1,34 m with a consolidation time of
30,14 days without smear effect and 160,00 days with smear effect.
From the comparison of soil improvement with PVD Preloading and
Vacuum Consolidation, it can be stated that soil improvement with Vacuum
Consolidation is more effective as a method of soil improvement in the extension
area of the Sultan Thaha Airport runway. This is evidenced by the increase in the
carrying capacity of the soil and the length of time for consolidation to reach a
consolidation degree of 90%. Taking into account the smear effect, the
consolidation time to reach the 90% degree of consolidation in both methods has
increased by 326,98% - 453,23% compared to without considering the effect of
the smear in all zones and on all variations used. The use of triangular and
quadrilateral patterns with different installation distances will affect the length of
time of consolidation to achieve a consolidation degree of 90%, this is evidenced
in studies where a triangle pattern with the smallest installation distance (s) will
obtain a faster consolidation time.

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Ketersediaan

Informasi Detail

Judul Seri

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No. Panggil

10 12. 220 (0037)

Penerbit

Pekanbaru : Universitas Riau – Pascasarjana – Tesis Teknik Sipil., 2020

Deskripsi Fisik

xvii, 97 hlm.: ill.: 29 cm

Bahasa

Indonesia

ISBN/ISSN

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Klasifikasi

10 12. 220 (0037)

Tipe Isi

-

Tipe Media

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Tipe Pembawa

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Edisi

-

Subjek

TEKNIK SIPIL

Info Detail Spesifik

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Pernyataan Tanggungjawab

FATAH

Versi lain/terkait

Lampiran Berkas

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