Modified Mat Foundation Design Over Soft Clay

2009 ◽  
pp. 127-127-14
Author(s):  
CN Baker ◽  
FP Wiesinger
Keyword(s):  
Soft Clay ◽  
Foundation Design ◽  
Mat Foundation

Analysis of Lightweight Concrete “Cakar Ayam” Foundation for Road Construction using Plaxis 3D Foundation Software

2014 ◽  
Vol 695 ◽  
pp. 729-733 ◽  
Author(s):  
Ahmad Hakimi Mat Nor ◽  
Aklil Hamdee Yahuda ◽  
Faizal Pakir
Keyword(s):  
Lightweight Concrete ◽  
Load Capacity ◽  
Soft Soil ◽  
Soft Clay ◽  
Road Construction ◽  
Soil Parameters ◽  
Slab Thickness ◽  
Foundation Design ◽  
Clayey Silt ◽  
Plaxis 3D

Road settlement often occurs because that soil cannot accommodate the load capacity. Therefore, the study to analysis of lightweight concrete “cakar ayam” foundation was conducted. The idea of “cakar Ayam” concept was introduced by Prof. Dr. Ir. Sediyatmo. Objective of these studies was achieved which is to determine the settlement value of lightweight concrete “Cakar Ayam” foundation design on soft clay, sand, clayey silt under the different loads. Hence, the effectiveness of lightweight concrete “cakar ayam” foundation on that soil, have been able to determined according the settlement value was obtained. Implementation of research was doing using Plaxis 3D foundation software. The foundation design was various according to the several of the column length. The slab thickness, spacing between column, foundation and column size was fixed. Soil parameters to analyse lightweight concrete “cakar ayam” foundation, was obtained from previous studies and Research Center of Soft Soil, Universiti Tun Hussien Onn Malaysia, (RECESS, UTHM). Each design was tested by different loads to get the settlement value. From the results show, the settlements value was obtained show concept of “cakar ayam” foundation, not effective to be implement on soft clay. The settlement value was over 25 mm, when the load 20 kN/m2 was applied on the foundation, to all length of column on soft clay. However, the settlement value was lower than 25 mm, when the load 40 kN/m2 was applied on the foundation, to all length of column on sand and clayey silt. From all the settlement value, it could be seen that clayey silt result was more effective than sand. The settlement value also was decrease when the length of pile was increase. In conclusion, the objective of the study was achieved.

Volume 14 Issue 1 Editorial Note

2020 ◽  
Vol 14 (1) ◽  
Author(s):  
Anne Lemnitzer
Keyword(s):  
Ground Improvement ◽  
Soft Clay ◽  
Lateral Spreading ◽  
Editorial Note ◽  
Foundation Engineering ◽  
Load Testing ◽  
Highly Qualified ◽  
Foundation Design ◽  
Deep Foundation

The first of two issues in 2020 is a mix of research and case study papers. 2020 is an exciting year for the DFI Journal as we expanded our editorial board with a set of highly qualified editors with various expertise in deep foundation engineering, ground improvement, slope stabilization, QA/QC of pile elements, load testing, seismic foundation design, and innovative foundation construction technologies. The first paper is a 2019 Student Paper Competition Award winner; the second covers factors of safety for drilled shaft foundations; the third presents results of models of pile-supported wharves subjected to inertial and liquefaction-induced lateral spreading loads; the fourth presents analysis of static loading tests on CFA piles in clay and sand; and the closing paper is an analysis of soft clay parameters on an existing quay wall in Egypt.

Bidirectional cell tests on non-grouted and grouted large-diameter bored piles

2015 ◽  
Vol 2 (3,4) ◽  
pp. 105-117 ◽  
Author(s):  
Minh Hai Nguyen ◽  
Bengt H. Fellenius
Keyword(s):  
Static Loading ◽  
Large Diameter ◽  
Soft Clay ◽  
Silty Sand ◽  
Foundation Design ◽  
Average Unit ◽  
Load Movement ◽  
Loading Tests ◽  
Bored Piles ◽  
Four Levels

Abstract The 37-storey apartment buildings of the Everrich II project in HoChiMinh City, Vietnam was designed to be supported on a piled foundation consisting of bored piles assigned a 22-MN working load per pile. The foundation design included performing bidirectional-cell, static loading tests on four test piles. The soil profile consisted of organic soft clay to about 28 m depth followed by a thick deposit of sandy silt and silty sand with a density that gradually increased with depth from compact to dense, becoming very dense at 65 m depth. In March 2010, the test piles, one 1.5-m diameter pile and three 2.0-m diameter piles, were installed to 80 m through 85 m depth and constructed using bucket drill technique with bentonite slurry and a casing advanced ahead of the hole. The bidirectional-cell assemblies were installed at 10 m through 20 m above the pile toes. The piles were instrumented with pairs of diametrically opposed vibrating wire strain-gages at three to four levels below and six to seven levels above the respective cell levels. After completed concreting, the shaft grouting was carried out throughout a 20 m length above the pile toe for the 1.5-m diameter pile and for one of the 2.0-m diameter piles. The static loading tests were performed about 34 through 44 days after the piles had been concreted. The analysis of strain-gage records indicated an average Young’s modulus value of about 25 GPa for the nominal crosssections of the piles. The average unit grouted shaft resistances on the nominal pile diameters were about two to three times larger than the resistance along the non-grouted lengths. The measured load distribution of maximum mobilized shaft resistances corresponded to effective stress proportionality coefficients, ß, of about 0.2 through 0.3. The ultimate shaft resistance for the pile lengths below the bidirectional cells reached an ultimate value after about 8 to 10 mm movement, whereafter the load-movement was plastic. The pile toe stress-movement responses to toe stiffness were soft with no tendency toward an ultimate value.

Vertical Load Mechanism Analysis and Experimental Research on Super-Long PHC Pipe Pile in Soft Clay

2012 ◽  
Vol 204-208 ◽  
pp. 471-478 ◽  
Author(s):  
Li Jun Zhou ◽  
Ziai Lu ◽  
Wen Juan Wang
Keyword(s):  
Experimental Research ◽  
Pile Foundation ◽  
Large Scale ◽  
Soft Clay ◽  
Calculation Model ◽  
Mechanism Analysis ◽  
Vertical Load ◽  
Foundation Design ◽  
First Choice ◽  
Tip Resistance

Pile foundation design has gradually used the super-long pile structure form with the port and offshore engineering construction developing towards to the direction of large-scale, deepwater, and coast geological becomes more complex, bearing stratum becomes more deeper. PHC pile is the first choice of pile foundation design form, just because it has many advantages. The former researches of pile vertical load mainly on limit bearing capacity, the calculation is reasonable for short pile and middle long pile, however, it is not reasonable for super-long pile, pile body side and tip resistance can not reach the limit when structure is to limit. This paper puts forward the calculation model of super-long PHC pile vertical load in soft clay based on vertical load mechanism analysis and experimental research on the foundation pile, and the calculated and test value coincide preferably.

A Deep Excavation and a Raft Foundation in Soft Clay

1972 ◽  
Vol 9 (3) ◽  
pp. 237-248
Author(s):  
A. Insley
Keyword(s):  
Case History ◽  
Soft Clay ◽  
Deep Excavation ◽  
Safety Factors ◽  
Marine Clay ◽  
Foundation Design ◽  
Foundation Soil ◽  
Actual Performance ◽  
Raft Foundation ◽  
Building Foundation

This is a case history describing a deep braced excavation in which a fully compensated raft foundation was constructed. The foundation soil is the Victoria marine clay, which is a soft normally consolidated deposit 70–100 ft (21–30 m) thick at this site. Observations were made on the deflections of the bracing and the heave of the excavation and were considered a necessary part of the design. Observations have also been kept on the settlement of the building foundation for over [Formula: see text] years. The calculated safety factors used in bracing design and foundation design are compared against the actual performance.

Issues on Design of Piled Raft Foundation

2018 ◽  
Vol 14 (1) ◽  
pp. 6057-6061 ◽  
Author(s):  
Padmanaban M S ◽  
J Sreerambabu
Keyword(s):  
Contact Area ◽  
Concrete Slab ◽  
Design Procedure ◽  
Bending Moment ◽  
Foundation Design ◽  
Detailed Review ◽  
Piled Raft ◽  
Piled Raft Foundation ◽  
Raft Foundation ◽  
Influencing Parameters

A piled raft foundation consists of a thick concrete slab reinforced with steel which covers the entire contact area of the structure, in which the raft is supported by a group of piles or a number of individual piles. Bending moment on raft, differential and average settlement, pile and raft geometries are the influencing parameters of the piled raft foundation system. In this paper, a detailed review has been carried out on the issues on the raft foundation design. Also, the existing design procedure was explained.

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