scholarly journals ANALISIS CARA PENINGKATAN DAYA DUKUNG FONDASI DANGKAL PADA KONSTRUKSI GEDUNG BERTINGKAT

2020 ◽  
Vol 3 (3) ◽  
pp. 897
Author(s):  
Feric Antonius ◽  
Alfred Jonathan Susilo
Keyword(s):  
Bearing Capacity ◽  
Friction Angle ◽  
Shallow Foundation ◽  
Soil Reinforcement ◽  
Crushed Stone ◽  
Unit Weight ◽  
Stone Column ◽  
Deep Foundation ◽  
High Rise ◽  
Crushed Limestone

ABSTRACTThe construction of high rise buildings requires a strong foundation. High rise building construction usually requires a deep foundation which requires a large cost. Therefore, shallow foundation can be used as an alternative to replace deep foundation. The main problem that arise is the low bearing capacity of the foundation which unable to carry the load. This research conducts is to find out how to increase the bearing capacity of a square footings with several reinforcement materials for high rise buildings. The analysis bearing capacity of shallow foundation is carried out manually using the Terzaghi method and the Meyerhof and Hanna method. The results of the analysis using these two methods show that soil reinforcement materials such as stone column, crushed stone, crushed limestone, construction and demolition can increase the bearing capacity of shallow foundations. The conclusions of this research with Terzaghi method obtained that the greater the value of the friction angle and unit weight of soil from the reinforcement materials, the bearing capacity of the foundation will be even greater, while the Meyerhof and Hanna method obtained that the stronger material does not always get the greatest value of bearing capacity because it depends on the type and consistency of the soil under the reinforcement layer.Keywords: bearing capacity; stone column; crushed stone; crushed limestone; construction and demolitionABSTRAKDalam perencanaan pembangunan seperti gedung bertingkat tentunya memerlukan sebuah fondasi yang kuat. Pembangunan konstruksi gedung bertingkat biasanya memerlukan fondasi dalam tetapi memerlukan biaya yang besar. Oleh karena itu, fondasi dangkal dapat digunakan sebagai alternatif untuk menggantikan fondasi dalam. Masalah utama yang timbul dari penggunaan fondasi dangkal untuk gedung bertingkat adalah daya dukung fondasi yang rendah sehingga tidak mampu memikul gaya luar. Penelitian ini dilakukan untuk mengetahui cara peningkatan daya dukung fondasi telapak persegi dengan beberapa material perkuatan tanah untuk gedung bertingkat. Analisis daya dukung fondasi dangkal dilakukan secara perhitungan manual menggunakan metode Terzaghi dan metode Meyerhof dan Hanna. Hasil analisis menggunakan kedua metode tersebut menunjukkan bahwa material perkuatan tanah yaitu stone column, crushed stone, crushed limestone dan construction and demolition yang digunakan dapat meningkatkan daya dukung fondasi dangkal. Kesimpulan dari penelitian ini antara lain menggunakan metode Terzaghi didapatkan bahwa semakin besar nilai sudut geser dalam dan berat jenis tanah dari material perkuatan yang digunakan maka nilai daya dukung fondasi akan semakin besar sedangkan metode Meyerhof dan Hanna didapatkan bahwa semakin kuat material belum tentu berpengaruh untuk mendapatkan nilai daya dukung yang paling besar karena dipengaruhi dengan jenis dan konsistensi tanah yang berada dibawah lapisan perkuatan tersebut.Kata kunci: daya dukung; stone column; crushed stone; crushed limestone; construction and demolition

scholarly journals Bearing Capacity of Ring Foundations on Sand Overlying Clay

2020 ◽  
Vol 10 (13) ◽  
pp. 4675
Author(s):  
Chaowei Yang ◽  
Zhiren Zhu ◽  
Yao Xiao
Keyword(s):  
Bearing Capacity ◽  
Friction Angle ◽  
Failure Criteria ◽  
Unit Weight ◽  
Sand Layer ◽  
Collapse Mechanisms ◽  
Internal Radius ◽  
Vertical Bearing ◽  
Vertical Bearing Capacity ◽  
Ring Foundations

The vertical bearing capacity of rough ring foundations resting on a sand layer overlying clay soil is computed in this study by using finite element limit analysis (FELA). The sands and clays are assumed as elastoplastic models, obeying Mohr–Coulomb and Tresca failure criteria, respectively. Based on the FELA results, design charts are provided for evaluating the ultimate bearing capacity of ring foundations, which is related to the undrained shear strength of the clay, the thickness, the internal friction angle, the unit weight of the sand layer, and the ratio of the internal radius to the external radius of the footing. A certain thickness, beyond which the clay layer has a negligible effect on the bearing capacity, is determined. The collapse mechanisms are also examined and discussed.

EFFECT OF REPLACING CRUSHED STONE IN STONE COLUMNS BY WASTE MATERIAL ON SOIL IMPROVEMENT RATIO

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Nahla Mohammed Salim ◽  
Shatha Hasan ◽  
Kawther Al-Soudany
Keyword(s):  
Bearing Capacity ◽  
Soft Clay ◽  
Soil Improvement ◽  
Waste Material ◽  
Stone Columns ◽  
Crushed Stone ◽  
Stone Column ◽  
University Of Technology ◽  
The University ◽  
Building Demolition

Many researchers’ studies have shown that stone column is the best material to use to improve the bearing capacity of clayey soils. There are millions of waste volumes resulting from daily human activities. This excess waste leads to disposal problems and also causes environmental contamination and health risks. Demolished concrete is such one waste material that is produced from building demolition in Baghdad, Iraq. This paper describes experimental work conducted at the University of Technology that was carried out to investigate the improved bearing capacity of soft clay using crushed stone, followed by replacing crushed stone with concrete waste with the same relative density and grain size. The replacement was carried using waste concrete with different percentages corresponding to 25%, 50%, 75%, and 100%. The main conclusion drawn is that the bearing capacity increased to 119% by using crushed stone column, while the bearing capacity increased to 155% by using 100% of crushed concrete waste.

Study on Vertical Bearing Capacity of the Wide-Shallow Bucket Foundation in Two Layered Sand

2020 ◽  
Author(s):  
Guodong Sun ◽  
Run Liu ◽  
Jijian Lian ◽  
Runbo Cai ◽  
Xu Yang ◽  
...  
Keyword(s):  
Internal Friction ◽  
Bearing Capacity ◽  
Friction Angle ◽  
Internal Friction Angle ◽  
Unit Weight ◽  
Offshore Wind Turbine ◽  
Sand Layer ◽  
Bucket Foundation ◽  
Vertical Bearing ◽  
Vertical Bearing Capacity

Abstract The wide-shallow bucket foundation proposed by Tianjin University of China is a new type of offshore wind turbine foundation. In this paper, the vertical bearing capacity of wide-shallow bucket foundation embedded in two layered sand that contains an underlying medium strength sand layer and a weaker or stronger overlaying sand layer is studied. A parametric study for bearing capacity is carried out with the ratio of unit weight γ1/γ2 (where γ1 and γ2 are the unit weight of the upper and lower sand layers respectively), the ratio of internal friction angle φ1/φ2 (where φ1 and φ2 are the internal friction angle of the upper and lower sand layers respectively) and relative thickness of the top sand layer H1/B (where H1 and B are the thickness of the top sand layer and the bucket foundation diameter). All of the presents were performed by the Finite Element Method and the results show that the thickness of the top layer has a great influence on the vertical bearing capacity of the foundation. Specifically, the upper sand layer is stronger, the bearing capacity ascends with the increase of the thickness of the top layer, and on the contrary, the upper layer is weaker, and the bearing capacity decreases with the increase of the top layer thickness. In addition, the bearing capacity of the foundation also increases with the ratios of the effective unit weight and the internal friction angle.

Pseudo-Dynamic Bearing Capacity of Shallow Strip Footing Resting on c-Φ Soil Considering Composite Failure Surface

2015 ◽  
Vol 6 (2) ◽  
pp. 12-34 ◽  
Author(s):  
Arijit Saha ◽  
Sima Ghosh
Keyword(s):  
Bearing Capacity ◽  
Failure Mechanism ◽  
Limit Equilibrium ◽  
Failure Surface ◽  
Friction Angle ◽  
Strip Footing ◽  
Unit Weight ◽  
Composite Failure ◽  
Seismic Accelerations ◽  
Seismic Bearing Capacity

The evaluation of bearing capacity of shallow strip footing under seismic loading condition is an important phenomenon. This paper presents a pseudo-dynamic approach to evaluate the seismic bearing capacity of shallow strip footing resting on c-F soil using limit equilibrium method considering the composite failure mechanism. A single seismic bearing capacity coefficient (N?e) presents here for the simultaneous resistance of unit weight, surcharge and cohesion, which is more practical to simulate the failure mechanism. The effect of soil friction angle(F), soil cohesion(c), shear wave and primary wave velocity(Vs, Vp) and horizontal and vertical seismic accelerations(kh, kv) are taken into account to evaluate the seismic bearing capacity of foundation. The results obtained from the present analysis are presented in both tabular and graphical non-dimensional form. Results are thoroughly compared with the existing values in the literature and the significance of the present methodology for designing the shallow strip footing is discussed.

Exact probabilistic solution of two-parameter bearing capacity for shallow foundations

1992 ◽  
Vol 29 (5) ◽  
pp. 867-870 ◽  
Author(s):  
Said M. Easa
Keyword(s):  
Bearing Capacity ◽  
Random Variable ◽  
Friction Angle ◽  
Shallow Foundations ◽  
Cohesionless Soil ◽  
Unit Weight ◽  
Previous Solution ◽  
Probabilistic Solution ◽  
Two Parameter ◽  
Soil Unit

An exact probabilistic solution of the ultimate bearing capacity of cohesionless soil for shallow strip foundations is presented. The solution incorporates two random variables: effective friction angle [Formula: see text] and soil unit weight γ. This solution is an extension of a previous solution in which only [Formula: see text] is considered as a random variable. The exact solution is verified using Monte Carlo simulation and the sensitivity of the solution to the coefficient of variation of the soil unit weight is examined. Key words : probability, reliability, bearing capacity, shallow strip foundations, friction angle, soil unit weight.

scholarly journals Efektifitas Penggunaan Alat Hydraulic Static Pile Driver (HSPD) pada Pemancangan

2018 ◽  
Vol 3 (1) ◽  
pp. 1
Author(s):  
Elvira Handayani ◽  
Jauhar Maknun
Keyword(s):  
Construction Projects ◽  
Swot Analysis ◽  
Rapid Development ◽  
Complex Structure ◽  
Shallow Foundation ◽  
Deep Foundation ◽  
Foundation Construction ◽  
Human Power ◽  
High Rise ◽  
Pile Driver

The rapid development of construction projects in Indonesia is directly proportional to the tools created and developed to assist and facilitate activities in the work. The tools no longer fully use human power but humans are only a part of the process of operating the tool. Limited land in the city of Jambi became the main reason in the construction of high-rise buildings. Thus, special technology is needed in order to facilitate the implementation of such development. One of the tools used is the tool for foundation work. Deep foundation construction has a more complex structure compared to shallow foundation construction. Therefore, in the construction of high-rise project, the use of jack in pile is considered very appropriate. One of the advantages of jack in pile is environmental disturbance such as vibration and noise can be minimized. In this research will discuss one type of Jack in Pile that is type Hydraulic Static Pile Driver (HSPD). Where in this case the effectiveness of the use of Hydraulic Static Pile Drivers (HSPD) on the Odua Weston project will be discussed according to the literature and supporting data available.Keywords: Effectiveness of Pollution, HSPD, SWOT Analysis

EXPERIMENTAL EVALUATION OF SOIL REINFORCEMENTS IN UNPAVED ROAD

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Nahla Salim
Keyword(s):  
Bearing Capacity ◽  
Static Load ◽  
Sandy Soils ◽  
Crushed Stone ◽  
Unit Weight ◽  
Harmonic Load ◽  
Geogrid Reinforcement ◽  
Dry Unit Weight ◽  
Load Tests ◽  
Number Of Cycles

In this study, a series of 24 laboratory tests were conducted on a footing resting on crushed stone with 17.68 kN/m3 dry unit weight overlying sandy soils of two relative densities corresponding to (60% and 80%). The subbase layer is of crushed stone with a thickness of 5, 7.5 and 10 cm. Ten tests were conducted under static load with and without geogrid. All the other 14 model tests were carried out under harmonic load which was applied in a sequence determined prior (40% of static load). Tests were conducted at (2) Hz frequency according to the loading value. The process of the loading was continued until the number of cycles reached 104. The results indicated that, for static load and with the inclusion of the geogrid, as the thickness of the subbase layer increases, the percentage of increase in bearing capacity was reduced. In general, using geogrid reinforcement with subbase thickness of 7.5 and 5 cm causes an increase in bearing capacity approximately 1.5 to 2 times greater than for unreinforced respectively. This means that by using geogrid reinforcement, the thickness of subbase can be reduced which causes a reduction in construction cost.

scholarly journals Reliability Analysis of Bearing Capacity of Shallow Foundation on c- φ Soil

2019 ◽  
Vol 5 ◽  
pp. 71-78
Author(s):  
Mahesh Acharya ◽  
Indra Prasad Acharya
Keyword(s):  
Bearing Capacity ◽  
Reliability Analysis ◽  
Design Method ◽  
Order Approximation ◽  
Shallow Foundation ◽  
Unit Weight ◽  
Multiple Sources ◽  
Systematic Analysis ◽  
Reliability Based Design ◽  
Taylor’S Series

Bearing capacity of shallow foundation is a challenging problem for geotechnical engineers. The difficulty comes from multiple sources of uncertainty. Only the uncertainties in Soil properties; unit weight (γ), cohesion(c), and angle of friction (φ) are taken in this study. The Reliability Based Design method is used for the assessment of bearing capacity of shallow foundation by First-and second-order approximation using Taylor’s series expansion and Mathcad Computer program which provide systematic analysis of uncertainties and allow the designer how reliable are their designs. The Terzaghi Bearing capacity equation is used for the analysis along with the certain range of variability (CV %) associated with the variables. For the reliability analysis, to become more realistic two real cases of shallow foundation on c-φ soil has been taken as a sample case.

Reliability evaluation of shallow foundation bearing capacity on c' ϕ' soils

2000 ◽  
Vol 37 (1) ◽  
pp. 264-269 ◽  
Author(s):  
C Cherubini
Keyword(s):  
Bearing Capacity ◽  
Probabilistic Models ◽  
Correlation Coefficients ◽  
Friction Angle ◽  
Reliability Evaluation ◽  
Shallow Foundations ◽  
Shallow Foundation ◽  
Probabilistic Methods ◽  
Deterministic Models ◽  
Modus Operandi

As our understanding of soils has been steadily improving, the characteristics of its variability can now be highlighted. This has practically changed our geotechnical modus operandi from strictly deterministic models to semiprobabilistic or even strictly probabilistic models. The latter are still to be regarded as experimental and cannot, for the time being, be used routinely in practical working applications. However, the ongoing, continued research and study of these methods combine to develop their worth and bring out any drawbacks. This paper proposes a possible application of probabilistic methods to the study of shallow foundations reliability with respect to their bearing capacity. The study concerns a foundation on a soil characterized by effective cohesion c' and friction angle ϕ', considering possible values of correlation coefficients between them and taking into account the effects of vertical fluctuation scale. The results show that higher reliability indexes are found when correlations between c' and ϕ' are negative and when the fluctuation scale has a minimum value.Key words: reliability, bearing capacity, shallow foundations, friction angle, cohesion.

A closed-form probabilistic solution for evaluating the bearing capacity of shallow foundations

1990 ◽  
Vol 27 (4) ◽  
pp. 526-529 ◽  
Author(s):  
C. Cherubini
Keyword(s):  
Bearing Capacity ◽  
Closed Form ◽  
Closed Form Solution ◽  
Friction Angle ◽  
Form Solution ◽  
Shallow Foundations ◽  
Shallow Foundation ◽  
Probabilistic Evaluation ◽  
Allowable Bearing Capacity ◽  
Probabilistic Solution

A closed-form solution for the probabilistic evaluation of shallow foundation bearing capacity according to the model proposed by Terzaghi, as modified by Krizek, is described. A numerical example explains the method of computation. Key words: statistics, probability, ultimate bearing capacity, allowable bearing capacity, shallow foundations, friction angle, numerical methods.

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