Muhammad Akbar Walenna | University of Birmingham (original) (raw)

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Papers by Muhammad Akbar Walenna

Environmental and Sustainability Indicators

Scour and Erosion IX, 2018

Civil Engineering Journal

Cement-Bentonite (CB) barriers are expected to become a sustainable and reliable engineering solu... more Cement-Bentonite (CB) barriers are expected to become a sustainable and reliable engineering solution. The deformation of CB is of interest to engineers to comprehend, particularly how CB responds to changes in loading during its construction and service life. The purpose of this study was to examine how samples of CB mixtures behaved during consolidation. This study investigated: (1) the influence of curing time and constituent materials on the consolidation properties of CB samples, (2) the volumetric change and the rate of volumetric change in response to a specific loading condition via consolidation tests. For this purpose, a laboratory consolidation test with a load range of 50 to 3200 kPa was carried out in accordance with BS 1377-7:1990 using the oedometer apparatus. This study discovered that the consolidation characteristics of CB samples are similar to those of overconsolidated soil. The CB sample became more resistant to consolidation under varying loads as curing progre...

The application of soil anchoring system and grid beam method of strengthening protection wall po... more The application of soil anchoring system and grid beam method of strengthening protection wall post construction failure was observed in this research. The construction of the slope wall protection is situated to suit the existence of barrier made for aqueduct. Based on the numerical simulation on scenario of potential causes of slope failure, it indicates several phenomena such as the stability of barrier foundation experiences drastic drop. Scrutinizing the result of investigation and ideal design criterion for structural element of barriers, the condition function of existing protection wall has the factor of slope stability SF=1.01~1.09, which is categorized as not safe and condition barrier failure. The strengthening method of soil anchoring (Skyhook Earth Anchor, with the capacity of 4 tons) which is combined with grid beam manages to improve the barrier's stability to SF=1.24~1.46 post construction and reduce horizontal displacement of barrier.

International Journal of GEOMATE, 2021

Problematic soil (soft soil), generally require a soil improvement techniques. One of the concept... more Problematic soil (soft soil), generally require a soil improvement techniques. One of the concepts of soil reinforcement is to utilize timber as a material for raft-pile foundation. In this study, a circular containers were used as testing medium for the various model of reinforcement techniques (i.e. pile with different length embedded, raft and raft-pile foundation) including unreinforced model sample. The small-scale model tests were carried out in the laboratory and the numerical analysis conducted by using Plaxis 3D. The raft and pile material using a locally available timber. The results show that the raft-pile foundation shows the smallest vertical deformation (settlement) compared to other types of foundations. The highest settlement reduction was observed in the raft-pile foundation which is almost 65% compared to unreinforced soil. Good agreement results were found between small-scale laboratory model test and numerical modelling, thus indicating the potential used of this foundation type by using local timber.

Geotechnical and Geological Engineering, 2017

This research aim to analyze the compressive strength characteristics of grouted soil-cement colu... more This research aim to analyze the compressive strength characteristics of grouted soil-cement column which is being utilized to strengthen road embankment from lateral deformation with variation on grouting pressure and water-cement ratio through Unconfined Compression Test (UCT). The result of the UCT will be used to analyze the ability of grouted soil cement column to reduce lateral deformation using PLAXIS 2D. The result of this research indicates that sample of Grouted Soil-Cement Column with water-cement ratio 0.8, grouting pressure 2 kg/cm2 and 28 days curing time has the best result with the highest value of Compressive Strength and Elastic Moduli which obtained 30.182 kg/cm2 and 307.98 kg/cm2 respectively. On the relationship between compressive strength and elastic modulus to the water-cement ratio, it shows a tendency that the higher value of water-cement ratio is, the lower the value of compressive strength which is obtained. The unit weight of sample did not change signif...

The dredging Jeneberang's sediment can be utilized as a construction material for road and buildi... more The dredging Jeneberang's sediment can be utilized as a construction material for road and building. This research aims to study the feasibility of material on the characteristics of the material as a flexible pavement subgrade material. The study conducts a stabilization method using Portland cement in order to increase the strength of the soil sediment. The result of study showed that the dredging sediment soil stabilized with cement tends to increase its strength with the addition of the cement content and the curing time. The relationship between CBR values and modulus resilient (k) follows the similar pattern of curve that published by the Indonesia Public Highways Department. The numerical models between the Portland cement contents (sp), modulus resilient (k), and CBR are defined and useful in determining the cement content when the values of the modulus resilient (k) and the CBR of the subgrade course are acknowledged or the contrary.

Recently, the Cone Penetration testing (CPTu) is a rapid method for determining the mechanical a... more Recently, the Cone Penetration testing (CPTu) is a rapid method for determining the mechanical
and transport properties of soils. The CPTu provides continuous profiles of soil characteristics that are reliable,
fast, and economical. In recent years, the CPTu has been used for site exploration, construction control,
assessment of ground improvement effectiveness, assessment of contaminant transport, and direct application to
deep foundations. Moreover, the estimation of the permeability from the CPTu is traditionally made from the
pore water pressure dissipation test data. The main objective of this research is to interpret the correlation
between CPTu field test data and value of permeability (k). From the result of CPTu’s data can be evaluated and
interpreted as correlation of value the soil permeability. Taking over the data was done in continuously
automatic record with velocity 2 cm/sec. Sum of point tests were three points with distance point 30 m each.
Profile interpretation in soil layer can be interpreted using the data value of cone resistance (qc), soil friction
along a side sleeve (fs), and pore water pressure (u2). Those values were firstly calculated to obtain 3 derived
units as total cone resistance (qt), friction ratio (FR), pore pressure parameter (Bq). The ground water level is
found at 1.4 – 1.5 m from surface, while the dissipation test is found 13.86 - 16.84 m in depth. The value of
permeability (k) determined in this research is found in the range of 1,5 x 10-4 – 5 x 10-8 cm/sec.

Environmental and Sustainability Indicators

Scour and Erosion IX, 2018

Civil Engineering Journal

International Journal of GEOMATE, 2021

Geotechnical and Geological Engineering, 2017