scholarly journals Pemodelan Perkuatan Menggunakan Bambu Untuk Daya Dukung Pondasi Dangkal pada Tanah Gambut

CANTILEVER ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 109-114
Author(s):  
Yulindasari Sutejo ◽  
Sutanto Muliawan ◽  
Ratna Dewi ◽  
Febrian Hadinata ◽  
Budi Ariawan ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Peat Soil ◽  
Shallow Foundations ◽  
Shallow Foundation ◽  
Sampling Location ◽  
Layer Depth ◽  
Number Of Layers ◽  
Percent Increase ◽  
Reinforcing Material ◽  
Effective Layer

Some of the unfavorable characteristics of peat soil are low bearing capacity and high compressibility. The reinforcing material used in this research which functions the same as geogrid are bamboo materials (grids and woven). The bamboo material used aims to determine the carrying capacity and reduction of shallow foundations on peat soil before being reinforced and after being reinforced. Bamboo matting and rectangular patterned bamboo grids. Laboratory scale testing were used as the research methodology. The peat soil sampling location came from the area of Dusun III Banyu Urip, Banyuasin regency, South Sumatra province. The bamboo material is obtained from the Seberang Ulu area, Palembang City and sand  is obtained from the sand depot in the Musi II area, Palembang City. The results of laboratory testing show that the addition of the number of reinforcement layers and the effective layer depth distance will give a greater bearing capacity ratio (BCR) value. The bearing capacity value of the shallow foundation before being reinforced on peat soil using Terzaghi's analysis is 45.232 kpa. Then, after testing the variation in the depth of the layer d = 0b; d = 0.25b; and d = 0.5b with the number of layers 1 layer, 2 layers and 3 layers obtained a variation which gives the highest bearing capacity value of layer depth variations d = 0.25b with the number of layers of 3 layers. The bearing capacity value is 94 kpa with a BCRvalue of 2.08 (percent increase of 107.96 %).

scholarly journals Comparative Analysis of Kazakhstani and European Approaches for the Design of Shallow Foundations

2020 ◽  
Vol 10 (8) ◽  
pp. 2920
Author(s):  
Assel Shaldykova ◽  
Sung-Woo Moon ◽  
Jong Kim ◽  
Deuckhang Lee ◽  
Taeseo Ku ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Summation Method ◽  
Shallow Foundations ◽  
Shallow Foundation ◽  
Design Procedures ◽  
Geological Conditions ◽  
Elastic Settlement ◽  
Geotechnical Design ◽  
The Difference ◽  
Design Calculations

The design of shallow foundations is performed in accordance with different building regulations depending on geotechnical and geological conditions. This paper involves the design calculations applying Kazakhstani and European approaches. The design of shallow foundations in Nur-Sultan city in Kazakhstan was implemented by the calculation of bearing capacity and elastic settlement in accordance with the design procedures provided in SP RK 5.01-102-2013: Foundations of buildings and structures, and Eurocode 7: Geotechnical design. The calculated results of bearing capacity and elastic settlement for two types of shallow foundations, such as pad foundation and strip foundation, adhering to Kazakhstani and European approaches are relatively comparable. However, the European approach provided higher values of bearing capacity and elastic settlement for the designed shallow foundation compared to the Kazakhstani approach. The difference in the results is explained by the application of different values of partial factors of safety for the determination of bearing capacity and different methods for the calculation of the elastic settlement of shallow foundations (i.e., elasticity theory and layer summation method).

Ultimate bearing capacity of shallow foundations on sand with geogrid reinforcement

1993 ◽  
Vol 30 (3) ◽  
pp. 545-549 ◽  
Author(s):  
M.T. Omar ◽  
B.M. Das ◽  
V.K. Puri ◽  
S.C. Yen
Keyword(s):  
Bearing Capacity ◽  
Key Words ◽  
Model Test ◽  
Ultimate Bearing Capacity ◽  
Shallow Foundations ◽  
Shallow Foundation ◽  
Laboratory Model ◽  
Critical Depth ◽  
Test Results ◽  
Laboratory Model Test

Laboratory model test results for the ultimate bearing capacity of strip and square foundations supported by sand reinforced with geogrid layers have been presented. Based on the model test results, the critical depth of reinforcement and the dimensions of the geogrid layers for mobilizing the maximum bearing-capacity ratio have been determined and compared. Key words : bearing capacity, geogrid, model test, reinforced sand, shallow foundation.

scholarly journals INVESTIGATION OF SHALLOW FOUNDATION SOIL BEARING CAPACITY AND SETTLEMENT CHARACTERISTICS OF MINNA CITY CENTRE DEVELOPMENT SITE USING PLAXIS 2D SOFTWARE AND EMPIRICAL FORMULATIONS

2017 ◽  
Vol 36 (3) ◽  
pp. 663-670
Author(s):  
AB Salahudeen ◽  
JA Sadeeq
Keyword(s):  
Soil Properties ◽  
Bearing Capacity ◽  
Average Energy ◽  
Shallow Foundations ◽  
Shallow Foundation ◽  
Analytical Models ◽  
City Centre ◽  
Foundation Soil ◽  
Development Site ◽  
Allowable Bearing Pressure

This study investigated the soil bearing capacity and foundation settlement characteristics of Minna City Centre development site using standard penetration test (SPT) data obtained from10 SPT boreholes at 0.6, 2.1 and 3.6 m depths to correlate soil properties. Evaluation of foundation bearing capacity and settlement characteristics for geotechnical preliminary design of foundations was carried out using some conventional empirical/analytical models and numerical modelling. The aim was to investigate and determine the geotechnical parameters required for adequate design of Physical structures of the proposed Minna City Centre, at Minna the capital of Niger state. The SPT N-values were corrected to the standard average energy of 60% (N60) before the soil properties were evaluated. Using the corrected N-values, allowable bearing pressure and elastic settlement of shallow foundations were predicted at 50 kN/m2 applied foundation pressure. The numerical analysis results using Plaxis 2D, a finite element code, shows the analytical/empirical methods of estimating the allowable bearing pressure and settlements of shallow foundations that provided acceptable results. Results obtained show that an average bearing capacity value of 100 – 250 kN/m2 can be used for shallow foundations with embedment of 0.6 to 3.6 m on the site.  http://dx.doi.org/10.4314/njt.v36i3.1

scholarly journals ANALISIS PERBANDINGAN PENURUNAN FONDASI DANGKAL DI TANAH GAMBUT DENGAN STABILISASI KAPUR DAN ABU SEKAM PADI

2021 ◽  
Vol 4 (1) ◽  
pp. 233
Author(s):  
Aviva Stevani ◽  
Chaidir Anwar Makarim
Keyword(s):  
Residential Buildings ◽  
Peat Soil ◽  
Dry Weight ◽  
Shallow Foundations ◽  
Shallow Foundation ◽  
Peat Soils ◽  
Untreated Soil ◽  
Total Settlement ◽  
Husk Rice ◽  
Housing Needs

The increase in housing needs is in line with the increase in the population. Residential buildings in Indonesia are only about 1-2 floors, which require shallow foundations to support. Land is one of the important aspects, where it supports the entire building that stands on it. One of the development constraints encountered in Kalimantan is the peat soil. The construction on peatland will cause problems such as low bearing capacity and large deformation, therefore it needs improvement before use. This study aims to find out the overview of shallow foundation settlement  with a size of 2 m x 2 m with a depth of 1 m in untreated soils with a thickness of 6 m and in stabilized peat soils. Stabilization used by 10% of the dry weight of the soil with a content of 30% lime + 70% ash husk rice. Calculation of the settlement in stabilized peat soil, there’re 5 variations of stabilization thickness ranging from 2 m – 6m. Within 30 years, the total settlement of untreated peat soil by 1,25828 m, as well as for stabilizing peat soils with a thickness of 2 m - 6 m experienced a total settlement of 0,534587 m to 0,379714 m. Peningkatan kebutuhan rumah tinggal selaras dengan peningkatan jumlah penduduk. Pada umumnya bangunan rumah tinggal di Indonesia hanya berkisar 1- 2 lantai, dimana membutuhkan fondasi dangkal untuk menopang beban. Tanah merupakan salah satu aspek penting, dimana tanah menopang seluruh bangunan yang berdiri diatasnya. Salah satu kendala pembangunan yang ditemui di Kalimantan adalah lapisan tanah gambut. Pembangunan bangunan diatas tanah gambut akan menimbulkan masalah seperti daya dukung yang rendah serta penurunan yang besar, maka dari itu perlu perbaikan sebelum digunakan. Penelitian kali ini bertujuan untuk mengetahui sebuah gambaran mengenai penurunan fondasi dangkal dengan ukuran 2 m x 2 m dengan kedalaman 1 m pada tanah gambut asli  (untreated soil) dengan ketebalan 6 m serta pada tanah gambut yang telah distabilisasi. Stabilisasi yang digunakan sebesar 10% dari berat kering tanah dengan kadar 30% kapur + 70% abu sekam padi. Perhitungan penurunan pada tanah gambut yang telah distabilisasi, ada 5 variasi ketebalan stabilisasi mulai dari 2 m – 6m. Dalam jangka waktu 30 tahun, penurunan total tanah gambut asli sebesar 1,25828 m, serta untuk tanah gambut stabilisasi dengan ketebalan 2 m – 6 m mengalami penurunan total sebesar 0,534587 m sampai 0,379714 m. 

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.

scholarly journals A NEW DESIGN EQUATION FOR PREDICTION OF ULTIMATE BEARING CAPACITY OF SHALLOW FOUNDATION ON GRANULAR SOILS

2014 ◽  
Vol 19 (Supplement_1) ◽  
pp. S78-S90 ◽  
Author(s):  
Ehsan Sadrossadat ◽  
Fazlollah Soltani ◽  
Seyyed Mohammad Mousavi ◽  
Seyed Morteza Marandi ◽  
Amir H. Alavi
Keyword(s):  
Bearing Capacity ◽  
Numerical Models ◽  
Ultimate Bearing Capacity ◽  
Prediction Performance ◽  
Shallow Foundations ◽  
Shallow Foundation ◽  
Granular Soils ◽  
Good Prediction ◽  
Design Equation ◽  
Statistical Measures

A major concern in design of structures is to provide precise estimations of ultimate bearing capacity of soil beneath their foundations. Direct determination of the bearing capacity of foundations requires performing expensive and time consuming laboratory tests. To cope with this issue, several numerical models have been presented by researchers. This paper presents the development of a new design equation for the prediction of the ultimate bearing capacity of shallow foundations on granular soils using linear genetic programming (LGP) methodology. The ultimate bearing capacity is formulated in terms of width of footing, footing geometry, depth of footing, unit weight of sand, and angle of shearing resistance. The LGP-based design equation is established using the results of several load tests on real sized foundations presented in the literature. Validity of the model is verified using a part of laboratory data that are not involved in the calibration process. The statistical measures of coefficient of determination, root mean squared error and mean absolute error are used to evaluate the performance of the model. Sensitivity and parametric analyses are conducted and discussed. The proposed model accurately characterizes the ultimate bearing capacity resulting in a very good prediction performance. The LGP model reaches a better prediction performance than the well-known prediction equations for the bearing capacity of shallow foundations.

scholarly journals Effect of perforations on the bearing capacity of shallow foundation on clay

2019 ◽  
Vol 56 (5) ◽  
pp. 746-752 ◽  
Author(s):  
Run Liu ◽  
Meng-meng Liu ◽  
Ying-hui Tian ◽  
Xinli Wu
Keyword(s):  
Shear Strength ◽  
Bearing Capacity ◽  
Three Dimensional ◽  
Shallow Foundations ◽  
Shallow Foundation ◽  
Two Dimensional ◽  
Element Analysis ◽  
Dimensionless Ratio ◽  
Undrained Strength ◽  
Strength Gradient

As a type of shallow foundation, a mudmat serves as the seabed support structure for subsea wells, pipeline manifolds, and pipeline terminations. The shallow foundations are usually designed with perforations to facilitate installation and removal, but the influence of these perforations has not been fully understood. This paper presents a method to analyze the bearing capacities of both two-dimensional (2D) and three-dimensional (3D) perforated shallow foundations using finite element analysis. The soil was idealized as a Tresca material, with the undrained strength increasing linearly with depth. The outcome indicates that perforations have nonnegligible effects on the bearing capacity of shallow foundations. The bearing capacity decreases with increasing perforation ratio, R, and the degree of reduction increases with the increase of the dimensionless ratio kB/Suo, where k is the shear strength gradient, B is the width of the foundation, and Suo is the shear strength at the mudline. For 2D shallow foundations, there exists a critical perforation ratio, Rc; when the perforation ratio is lower than the critical perforation ratio, the perforated foundation does not lose its bearing capacity. For 3D shallow foundations, the bearing capacity decreases directly with the increase of perforation ratio, R.

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