Volume 09 No. 1, Januari 2009
http://hdl.handle.net/11617/43
2024-03-28T09:21:33ZPERILAKU INTERAKSI TANAH-GEOTEKSTIL TERHADAP PARAMETER KUAT GESER
http://hdl.handle.net/11617/234
PERILAKU INTERAKSI TANAH-GEOTEKSTIL TERHADAP PARAMETER KUAT GESER
Rifa’i, Ahmad
Soil reinforcement using geo-textile is one of geotechnical structures, involving soil-structure interaction. Recently,
the problems are solved by neglecting the interface influence between soil and structure. To obtain more realistic stressstrain
relationship, it is required to study the soil-structure interface. The study of behavior of soil-geotextile interaction
on the shear strength parameters is discussed in this research. The used soils in this research are uniform sand and
clay. The uniform sand has relative density of 50% and 90%. The clay sample is based on the maximum dry density
(MDD) value obtained from standard Proctor test. Determination of interface parameter on the shear strength of sandgeotextile
and clay-geotextile is obtained from direct shear test. The interface shear strength parameters are friction angle
of interface () and adhesion (ca). The used geotextile types are woven, non-woven and geomembrane. Numerical
simulation is also carried out to study the influence of variation values on interface shear strength parameters. Result of
the research gives review on the behavior and interface modeling of soil-geotextile. Values of friction angle of interface
() obtained from sand-non-woven geotextile are higher than sand- woven geotextile. The value of obtained from sandgeomembrane
is the lowest. Ratio of / for non-woven geotextile ranges between 0.8 1.0. Ratio of / for woven geotextile
is about 0.7 0.8. Geomembrane ratio of / is about 0.6 0.7. The value of / is relativelyconstant for sand under
both saturated and dried conditions. For clay sample, the values of ca and are lower than value of soil shear
strength parameters. The shear stress of geomembrane interface (HDPE) is the lowest under both saturated and unsaturated
conditions. The interface shear strength parameters are influenced by the roughness of material and effective opening
size of interface material. For clay, the values of ca/c and / are influenced by saturation conditions of soil. Influence
of ca and parameters is represented by value of Rinterface parameter. Higher Rinterface value will decrease the
displacement, moment and shear force and increase the safety factor. The result of this research can give contribution on
determination of interface shear strength parameters in the analysis of soil reinforcement using geotextile in order to design
optimalization.
2009-01-01T00:00:00ZEVALUASI JALAN LINGKAR UTARA SURAKARTA DITINJAU DARI PERILAKU PEMILIHAN RUTE
http://hdl.handle.net/11617/233
EVALUASI JALAN LINGKAR UTARA SURAKARTA DITINJAU DARI PERILAKU PEMILIHAN RUTE
Sriwidodo; Sutarto, Agung
The objective of this study is to evaluate of Ring Road Development seen from the behavior of passenger car in
Surakarta in choosing between north ring road and arteries route with logit binomial model. The dependent variable
needed are journey time and cost. Data were taken by recording the number of vehicle and journey time on Monday,
Tuesday, Wednesday, and Saturday started at 06.00 am – 18.00 pm. Then, data were analyzed to find the correlation
among the proportion of route choice, headway, and journey cost with regression in three traffic flow: west to east, east
to west, and both. The study concluded that the passenger car from west to east traffic in peak hours tends to choose ring
road, while from east to west traffic in peak hours of afternoon tends to choose arteries road because of some reasons
namely any necessity in city, landscape factor, and geometric intersection. The car passengers of Surakarta vehicle
number on Saturday in peak hours tend to choose ring road, and choose artery road in off-peak hours. The car
passengers of non-Surakarta vehicle number on Saturday in both peak hours and off-peak hours tend to choose artery
road because some reasons i.e. there is no delay, time is not priority, and there is chance to see city. The representative
logit binomial by choosing journey time and operational vehicle cost variables is model while route probability of route A
or ring road at headway and journey cost is zero. The existence of north ring road is highly needed and traffic average
speed in ring road should be increased. It is recommended that the plan and design of corridors of north ring road are
needed in order to reach the aim of the development of ring road as speed traffic with average speed fitting with the
speed design of ring road. The unique buildings and environments as Surakarta’s characteristic should be maintained
and spots of bad services are removed.
2009-01-01T00:00:00ZVALIDASI MODEL NUMERIK ARUS SEJAJAR PANTAI DENGAN MODEL ANALITIK LONGUET-HIGGINS
http://hdl.handle.net/11617/232
VALIDASI MODEL NUMERIK ARUS SEJAJAR PANTAI DENGAN MODEL ANALITIK LONGUET-HIGGINS
Setiawan, Ichsan
A numerical model wave induced current known as longshore current was generated by means of finite different
explicit scheme approximation. The numerical model was then derived by means of hydrodynamic equation
discretization. The forward and central different were applied to time and space derivation, respectively. Meanwhile,
analytical model was derived by means of Longuet-Higgins analytical model. Variations of incident wave from 20o-70o
were implemented for both models. The numerical model was validated by means of Longuet-Higgins analytical model
(1970). The result of simulated wave induced current model indicated that maximum velocity is approximately consistent
to Longuet-Higgins analytical model with the highest and least differences of 3.4 % and 1.4 % or mean differences of 1.9
% for the six incident wave scenarios.
2009-01-01T00:00:00ZPENGGUNAAN CAMPURAN LUMPUR LAPINDO TERHADAP PENINGKATAN KUALITAS GENTENG KERAMIK
http://hdl.handle.net/11617/231
PENGGUNAAN CAMPURAN LUMPUR LAPINDO TERHADAP PENINGKATAN KUALITAS GENTENG KERAMIK
Wahjuni Setyowati, Edhi
Nowadays, roof-tiles are largely used as one of the common building materials. In contrary Lapindo mud, which
keeps growing each day, need to be thought on its advantages. Therefore many researches caught this phenomenon and
tried to find out the correlation between Lapindo mud and roof-tiles material. As results, previous studies proved that
there are possibilities to apply Lapindo mud into ceramics material mix, as well as into ceramic roof-tiles material with
appropriate strength values. Advance studies on the effect of the Lapindo mud use to the equality of roof-tiles based on
SNI 03-2095-1998 and PGKI NI-19 provided many information on its effects against: roof-tiles, roof-tiles weight, rooftiles
cracks, roof-tiles dot percentages, roof-tiles flatness, its form-sizes, as well as its absorption. Furthermore, the
perfect mix of Lapindo mud on producing roof-tiles will give advantages on increasing strength and increasing
impermeable values. While on the other hand, too much Lapindo mud compositions will produce on deformation and the
increasing amount of cracks and dots. As mentioned before, a high-quality of ceramic roof-tiles can be achieved from a
perfect mix of Lapindo mud. Therefore further researches are needed to investigate the optimum compositions of Lapindo
mud, in order to produce a high quality of Lapido ceramic roof-tiles.
2009-01-01T00:00:00Z