scholarly journals Daya Dukung Tanah Fondasi Dangkal Pada Bukit Hambalang Bagian Selatan, Kecamatan Citeureup, Kabupaten Bogor

2017 ◽  
Vol 8 (3) ◽  
pp. 143
Author(s):  
Rifki Asrul Sani
Keyword(s):  
Bearing Capacity ◽  
Standard Penetration Test ◽  
Geological Mapping ◽  
Shallow Foundation ◽  
Soil Parameters ◽  
Penetration Test ◽  
Square Footing ◽  
Local Soil ◽  
Allowable Bearing Capacity ◽  
Shear Condition

ABSTRAKSeiring dengan terjadinya longsoran di beberapa titik wilayah di bukit Hambalang, maka diperlukan kajian data kondisi geologi teknik berupa sifat fisik dan mekanik tanah serta batuan bawah permukaan, terutama mengenai daya dukung tanah dalam menahan beban bangunan di atasnya agar tidak terjadi penurunan. Metode yang digunakan dalam penelitian ini dibagi menjadi tiga, yaitu metode penelitian studio dengan memanfaatkan data-data sekunder yang telah ada, metode penelitian di lapangan melalui pemetaan geologi untuk mendapatkan data litologi yang tersingkap di permukaan, zonasi longsoran yang terjadi, dan identifikasi kekuatan tanah hasil pemboran geoteknik dengan Standard Penetration Test (SPT), serta metode penelitian di laboratorium untuk mendapatkan parameter sifat fisik dan mekanik tanah sebagai penunjang data daya dukung tanah serta geologi teknik daerah penelitian. Hasil perhitungan fondasi dangkal untuk general soil shear condition dan local soil shear condition dapat disimpulkan bahwa daya dukung tanah yang diizinkan (qa) untuk setiap kedalaman yang paling tinggi pada fondasi bujur sangkar (square footing) dan nilai tertinggi yang terdapat pada kedalaman 2 m, yaitu 57,32 ton/m2 dan 36,11 ton/m2. Fondasi yang paling rendah untuk semua kedalaman pada fondasi menerus (continuous footing) untuk kedalaman 2 m memiliki nilai 34,49 ton/m2 dan 21,25 ton/m2. Berdasarkan data SPT, nilai daya dukung yang diizinkan (qa) pada masing-masing titik bor berkisar pada rentang 2,85 ton/m2 sampai 16,85 ton/m2. Kata kunci: longsoran, daya dukung, Standard Penetration Test (SPT). ABSTRACTAlong with the landslide in some areas on the Hambalang Hill, it needs data of engineering geological study such as mechanical and physical properties of soil also subsurface rocks. Especially regarding the soil bearing capacity in order to restrain the building from settlement. There are three methods which used in this research, those are studio research by using secondary data, fieldwork research that is geological mapping conducted to obtain data on lithological rocks at surface, landslide zone and soil strength identification from geotechnical drilling with Standard Penetration Test (SPT) and laboratory research to obtain the soil parameters of physical and mechanical properties, which used to support soil bearing capacity data and engineering geology in research area. The calculation results of the shallow foundation for general soil shear condition and the local soil shear condition it could be concluded that the allowable bearing capacity for all depth which is highest at the square footing and the highest value found to a depth of 2 m, that is 57.32 ton/m2 and 36.11 ton/m2. The lowest foundation for all the depth of the continuous footing to a depth of 2 m had value 34.49 ton/m2 and 21.25 ton/m2. Based on data from SPT, the allowable bearing capacity on each of borehole ranging from 2.85 ton/m2 to 16.85 ton/m2. Keywords: landslide, bearing capacity, Standard Penetration Test (SPT).

Nomographs for predicting allowable bearing capacity and elastic settlement of shallow foundation on granular soil

2019 ◽  
Vol 12 (15) ◽  
Author(s):  
Maher Omar ◽  
Abdallah Shanableh ◽  
Khaled Hamad ◽  
Ali Tahmaz ◽  
Mohamed G. Arab ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Shallow Foundation ◽  
Granular Soil ◽  
Allowable Bearing Capacity ◽  
Elastic Settlement

Research on the Relationship between SPT and the Ultimate Vertical Bearing Capacity of Jacked Pile in Shenyang District

2011 ◽  
Vol 71-78 ◽  
pp. 3308-3311
Author(s):  
Xiang Ruan ◽  
Ren Yu Zuo
Keyword(s):  
Bearing Capacity ◽  
Empirical Formula ◽  
Standard Penetration Test ◽  
Penetration Test ◽  
Initial Stage ◽  
Engineering Requirement ◽  
Load Tests ◽  
Vertical Bearing ◽  
Vertical Bearing Capacity ◽  
The Relationship

Though the wide applications of jacked pile in engineering in Shenyang district, the problem is also exist in engineering for the capacity of the jacked pile is hard to account. The relationship between the standard penetration test and the ultimate vertical bearing capacity of jacked pile is established in this paper; also an empirical formula is put forward for calculating the ultimate vertical bearing capacity of the jacked pile in this district with blow count of standard penetration test (SPT). The engineering examples indicated that the empirical formula is feasible because the calculating bearing capacity of the silent pipe pile is coincided with the static load tests. The calculated results satisfy the engineering requirement andt can be concluded that the method is also convenient to choose the diameter and length of the pile during the initial stage of design.

scholarly journals PROPOSTA DE APLICAÇÃO DE RESULTADOS DE SONDAGENS COM MARTELO LEVE (DPL) NO CAMPO EXPERIMENTAL DA UNIFOR EM PROJETOS DE FUNDAÇÕES PARA PEQUENAS CARGAS [ Proposal for the Application of Dynamic Probing Light (DPL) Results in the Experimental Field of UNIFOR in Foundations Projects for Small Loads ]

2018 ◽  
Vol 14 (2) ◽  
Author(s):  
Marcos Fábio Porto de Aguiar ◽  
Fernando Feitosa Monteiro ◽  
Francisco Heber Lacerda de Oliveira ◽  
Yago Machado Pereira de Matos
Keyword(s):  
Bearing Capacity ◽  
Standard Penetration Test ◽  
Coefficient Of Determination ◽  
Deep Foundations ◽  
Penetration Test ◽  
In Situ Tests ◽  
Foundation Design ◽  
Experimental Field

RESUMO: Em meio aos diversos métodos utilizados no Brasil para determinação da capacidade de carga de fundações, a grande maioria parte do índice de resistência à penetração (NSPT). Para o caso de pequenas edificações, devido a fatores geralmente econômicos, a experiência ou a prática regional costumam prevalecer. Sendo assim, são elaborados, muitas vezes, projetos sem um procedimento de cálculo fundamentado em parâmetros comprovados por ensaios geotécnicos, podendo ocasionar problemas na edificação, como recalques excessivos, ou, até mesmo, comprometer a segurança da estrutura. Dessa forma, técnicas mais simples e de baixo custo, como o DPL (Dynamic Probing Light), podem ser uma opção para situações de pequenas cargas, viabilizando projetos fundamentados em ensaios in situ. Partindo de investigações com o DPL, este trabalho tem o objetivo de dimensionar fundações superficiais e profundas para edificações de pequeno porte através de algumas das principais metodologias disponíveis na literatura e verificar a sua eficiência. Por meio de resultados de campanhas de sondagens SPT (Standard Penetration Test) e DPL no campo experimental da Universidade de Fortaleza (UNIFOR), determinou-se a capacidade de carga de fundações superficiais e profundas fazendo aplicação dos índices NSPT e NSPT equivalente obtido pela correlação com o DPL. Identificou-se que essa correlação apresentou coeficiente de determinação satisfatório entre os parâmetros obtidos nos ensaios SPT e DPL para o terreno em questão, mostrando-se o DPL ser uma alternativa pertinente, em termos técnicos para projetos de fundações de obras de pequeno porte.ABSTRACT: Among the various methods used in Brazil of the determination of the bearing capacity on foundations, most part uses the standard penetration resistance (NSPT). For small constructions, due to economic factors generally, experience or regional practice usually prevails. Thus, projects without a reasoned calculation procedure in parameters supported by geotechnical tests are often designed, and may cause problems in the building, as excessive settlements, or even compromise the safety of the structure. In this way, simple and low cost techniques such as DPL (Dynamic Probing Light) may be an option for small loads situations, enabling projects based on in situ tests. This paper proposes to calculate the dimensions of shallow and deep foundations for small constructions and check its efficiency using DPL tests. Through the results of SPT (Standard Penetration Test) and DPL tests in the experimental field of the University of Fortaleza (UNIFOR), the determination of the bearing capacity in shallow and deep foundations was done using NSPT index and equivalent NSPT index obtained by the correlation with DPL. A correlation with satisfactory coefficient of determination was obtained between SPT and DPL tests parameters for the analyzed field, showing up the DPL as an appropriate alternative in technical terms for foundation design of small constructions.

scholarly journals DAYA DUKUNG SEDIMEN DASAR LAUT DI PERAIRAN PELABUHAN CIREBON DAN SEKITARNYA

2016 ◽  
Vol 1 (1) ◽  
Author(s):  
Asep Permana ◽  
Purnomo Raharjo
Keyword(s):  
Bearing Capacity ◽  
Neap Tide ◽  
Maximum Velocity ◽  
Standard Penetration Test ◽  
Development Planning ◽  
Penetration Test ◽  
Sea Floor ◽  
The North ◽  
Minimum Velocity ◽  
Foundation Structure

Daya dukung sedimen dasar laut dan aspek keteknikan pada perencanaan pengembangan pelabuhan Cirebon lebih ditekankan pada faktor geoteknik, geofisika dan oseanografi. Pada saat pasang arah arus cenderung ke arah selatan dan baratdaya, sedangkan pada saat surut cenderung ke arah utara dan timurlaut dengan kecepatan rata-rata maksimum 0.11 m/detik dan minimum 0.08 m/detik. Morfologi dasar laut di perairan pelabuhan Cirebon sangat landai bervariasi antara - 6,5 m (LWS) dan -8.00 m, sedangkan kolamnya sendiri antara 0.00 -2.00 m, Daya dukung tanah pada kedalaman 18.00 - 27.00 m dari LWS di bagian atas diselingi oleh pasir lepas hingga lempung pasiran merupakan tanah bersifat lunak (soft) dengan N SPT = 22 hingga 32 tumbukan (blows). Data sondir di sekitar lokasi dermaga menunjukan nilai harga Qc = 2-4 kg/cm2 pada kedalaman 2.00-11.50 m dan nilai Qc > 150 kg/cm2 dijumpai pada kedalaman 14.00-15.50 m. Sedangkan lapisan bawah di daerah Astanajapura pada kedalaman lebih dari 20.00 meter tertumpu pada pasir, padat, keras, nilai SPT antara 35 hingga lebih dari 50 tumbukan. Analisis mineral lempung yang ada di daerah selidikan memperlihatkan bahwa lempung monmorilonite sangat dominan dan diketahui bahwa tanah yang mengandung monmorilonite sangat mudah mengembang oleh tambahan kadar air sehingga tekanan pengembangannya dapat merusak struktur bangunan pondasi. Bottom sediments bearing capacity on Cirebon harbor development planning are focused on Geotechnique, geophysical and oceanographically aspects. During tidal spring, current tend to the south and southwest wards and during the neap tide tend to the north and northeast with mean maximum velocity was 0.11 m/sec and minimum velocity was 0.08 m/sec. The sea floor morphology in the Cirebon harbor waters is slightly gentle and the water depth varies from -6.5 to 8.5 m (LWS), while the depth of the pond itself are between 0.00 to -2.00 meters. The bearing capacity from SPT (Standard Penetration Test) at depth between 18.00 - 27.00 m are composed of loose sand to sandy clay, soft, with (N) SPT values about 22 to 32 blows. Sondir data obtained at depth 2.00 - 11.50 and Qc value about 2 - 4 kg/cm2 while at depth 14.00 m to 15.50 m Qc value data about more > 150 kg/cm2 was found at depth more than 20.00 meters. The lower part layers in Astanajapura are composed of sand, dense, hard, with SPT value data obtained are 35 to more than 50 blows. Clay mineral analysis showed montmorilonite is dominant in this survey area. So that very easy to swell and will influenced the foundation structure construction.

scholarly journals Cramming the Specificities in Contemplating Safe Bearing Capacity for the Foundation Assessed from Borehole Samples in a Sandy-Moorum Zone

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Tarun Kumar Lohani ◽  
Melkamu Teshome Ayana ◽  
Abdella Kemal Mohammed ◽  
Jyotiranjan Pattanaik
Keyword(s):  
Soil Properties ◽  
Bearing Capacity ◽  
Laboratory Testing ◽  
Standard Penetration Test ◽  
Soil Samples ◽  
Clear Understanding ◽  
Foundation Settlement ◽  
Penetration Test ◽  
Spt Data ◽  
Allowable Settlement

Borehole samples drilled up to a depth of 10 m provide a clear understanding whether a foundation is safe for any structure. The main objective of the present study reconnoitered the soil bearing capacity and foundation settlement characteristics using the standard penetration test (SPT) data obtained from 3 boreholes at 1 m, 2 m, and 3 m depths to correlate soil properties and deterrents, if any, created by groundwater. The methodology of the research is to collect soil samples, and ensuing subsoil analysis was performed in order to obtain concrete information to optimize the foundation system within the safe bearing capacity of soil and its allowable settlement. The scope of the work encompasses conducting detailed soil investigation from drilling logs, laboratory testing, and conducting and estimating safe bearing capacity. The result of the research aims at providing safety to the foundation from the investigations of conclusive recommendation to be adopted which would be economically feasible and structurally secured.

scholarly journals Shear wave velocity by support vector machine based on geotechnical soil properties

2014 ◽  
Vol 2 (4) ◽  
pp. 2443-2461 ◽  
Author(s):  
I. Shooshpasha ◽  
A. Kordnaeij ◽  
U. Dikmen ◽  
H. MolaAbasi ◽  
I. Amir
Keyword(s):  
Support Vector Machine ◽  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Effective Means ◽  
Standard Penetration Test ◽  
Support Vector ◽  
Soil Parameters ◽  
Penetration Test ◽  
In Situ Tests

Abstract. Shear wave velocity (VS) is a basic engineering property implemented in evaluating the soil shear modulus. In many instances it may be preferable to determine VS indirectly by common in-situ tests, such as the Standard Penetration Test (SPT). In this paper, the relationship between VS and geotechnical soil parameters such as standard penetration test blow counts (N160), effective stress and fines content, as well as overburden stress ratio (σvo/σ′vo), is investigated. A new mode based on support vector machine (SVM) approach is proposed to correlate geotechnical parameters and VS, predicated on a total of 620 data sets, including field investigation records for the Kocaeli (Turkey, 1999) and Chi-Chi (Taiwan, 1999) earthquakes. This study addresses the question of whether Support Vector Machine (SVM) approach should be used to estimate VS based on the specified geotechnical variables, and assessing the influence of each variable on VS. Results revealed that SVM, in comparison to previous statistical relations, provides an effective means of efficiently recognizing the patterns in data and accurately predicting the VS.

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