Shallow foundation analysis by smoothed particle hydrodynamics method

This paper illustrates the use of Smoothed Particle Hydrodynamics (SPH) technique to compute the bearingcapacity of shallow foundations and establish their failure mechanism. SPH is a numerical method based on aLagrangian formulation to solve partial differential equations by discretizing the computational domain with a setof particles that have field variables such as mass, and density. SPH is a meshless method and is not affected bythe particles’ arbitrariness due to its adaptive nature, and it can naturally handle problems that are caused by largedeformations. Non-associated Drucker-Prager model is implemented into the model to simulate the soil behavior.The computed values are then compared with PLAXIS 2D finite element results. Agreements of the results ofthese two methods show that SPH is potentially a promising method for geotechnical problems experiencing largedeformations and mesh distortions

NUMERICAL SIMULATION OF FRAME STRUCTURE ON SHALLOW FOUNDATION WITH EXPANDED POLYSTYRENE (EPS)

For the past 30 years, applications of expanded polystyrene (EPS) geofoam have been proposed. Several studies have examined the behavior of geofoam and produced beneficial results in the evolution of its application. One of application ofexpanded polystyrene can be used laid under the grade beam or slab. Meanwhile some of existing structure were suported by shallow foundation. Thus when EPS applied beneath shallow foundation to be alternative design, EPS supposed reduce theseismic response of structure. The purpose of this study is to investigate the seismic response of structure numerically due to application of EPS applied beneath the shallow foundation. In this study, the D7S2 finite element program was adopted toinvestigate the seismic response of structure due to apllication of EPS applied beneath the shallow foundation subjected to the earthquake motion. Verification and validation of the program was conducted by comparing the results to the shaking tabletest results. A series of parametric study is conducted including the interface element and the variations of size of EPS. The use of EPS underneath shallow foundation do not show the correlation with the seismic response of structure if there is no interface element constructed. Variation of EPS size used were contributed to the acceleration and displacement of  structure with shallow foundation. As the larger size of EPS applied, the larger reduction of seismic responses will be obtained

Numerical study on load-settlement relationships of shallow foundation under extremely low confining pressure

In order to investigate the ground behavior under shallow foundation with extremely low confining pressure, numerical analysis has been performed using the Material Point Method. Material Point Method is one of particle-based methods but it still uses numerical grid. It has been applied to many problems of geomaterial since it was proposed for the first time. The authors focus on the robustness of the method under large deformation problem and applied it to the shallow foundation problem of geomaterial. In this paper, the formulation and implementation of Material Point Method are described, followed by verification and validation for the implemented code. Then, the parametric investigations on ground behavior under shallow foundation have been carried out

Pengaruh Bentuk dan Dimensi Tapak Pondasi terhadap Daya Dukung Pondasi Dangkal Akibat Beban Aksial pada Tanah Pasir

The load distribution of shallow foundation spread out along the width of the foundation. Ultimate bearing capacity is defined as the maximum load that can be supported by the footing. Some form of shallow foundation were square, rectangular and circular shapes were they made to analyze the influence of the foundation over the same area of the shallow foundation bearing capacity due to axial loads on sandy soil. Variations foundation area of 100 cm2, 150 cm2 and 200 cm2. In the same area, the square shape can withstand greater load than in rectangular and circular shapes. Addition area will make 50-100% in weight-bearing capacity increased from 102,016 to 157,661% for squares, 135,751 to 228,497% for the rectangle and circle 187,413 to 341.259%. There are differences in the results of observation and empirical formula. Shape factors of squares and circles according to Mayerhof, Vesic and Hansen are the same. So, Terzaghi`s formula was similiar phenomenom with this research

Shallow Foundation Design through Probabilistic and Deterministic Methods

Risk and Reliability in Geotechnical Engineerin

Pondasi Dangkal Diatas Tanah Lunak Dengan Perkuatan Cerucuk Galam Berdasarkan Percobaan Lapangan

This research studying the behaviour of shallow foundation with cerucuk support. 1,0 m2 reinforced concrete square of shallow foundation model is used, with 5 cm of cerucuk diameter. The research is to find out the foundation ultimate bearing capacity with 1,0 m and 2,0 m length variety of cerucuk, the distance between the pile is 1/4B, 1/3B and 1/2B and also area covered with cerucuk is 1,0 m2, 2,0 m2 and 3,0 m2. To observe the settlement behaviour is made with giving fixed load of 40%, 60% and 100% of ultimate load ratio at 1,0 m and 2,0 m cerucuk at the same area covered with cerucuk that is 2,0 m2. The result of research shows that the deeper the cerucuk is embedded, the distance between the pile is getting closer and the wider the area covered with cerucuk, the pile ultimate bearing capacity is bigger and the settlement is smaller. To decrease the settlement of shallow foundation, the fixed load that allowable must be 2,5

Finite Element Analysis Of Reasonable Foundation For Supporting Silo’s Tower

The limitation of soil data due to poor soil investigation process is a common problem in civil engineering project. The finite element method was used to analyse the compatibility of foundation to support silos in Liverpool Docks. Both shallow foundation and pile foundation were considered. The results of the analyses are presented by comparing analytical and numerical solution. Parametric study was considered for each case. There are different results for two types of shallow foundation that had been considered. Strip foundation seemed more reliable than pad foundation, while Pile foundation considered to be first choice due to the satisfactory condition for all factor

Johnston City School, Mine Subsidence or Shallow Foundation Problem?

Johnston City, a small community in southern Illinois, lies above the Herrin (Illinois No. 6) coal seam. The community has experienced sporadic episodes of surface subsidence due to the collapse of underground mines since the 1930\u27s. Although the mining company left a large block of coal beneath the town\u27s elementary school to prevent subsidence damage to the structure, large cracks appeared in the school building in December, 1971. After the building was razed, construction of a new school was initiated in 1974. Approximately six months after the start of construction, new evidence of structural distress was observed in \u27the still-uncompleted structure. Construction was suspended indefinitely while site investigations were conducted. These investigations, along with recent air photo studies, indicate that renewed mine collapse and the resulting downward displacement of the surface, were the cause of this second incident of structural distress

A new re-usable shallow foundation for light loads: load tests and analysis

An innovative re-usable shallow foundation system for light loads has been developed consisting of a concrete block and four steel tubes driven into the ground at different orientations. The interaction between the block, the tubes and the enclosed soil ensures a significant enhancement of the bearing capacity compared to that of an equivalent conventional shallow foundation. The paper reports the results of two load tests (compression and tension) carried out to study the performance of the system. The interpretation of the test is assisted by the performance of 3D numerical analyses capable of reproducing satisfactorily the field observations. The results of the analyses have allowed an estimation of a limit load below which the foundation system can be re-used.Postprint (published version