Unified Design of Piled Foundations with Emphasis on Settlement Analysis

Fellenius, Bengt H.

doi:10.1061/40743(142)15

Cited by 44 publications

(19 citation statements)

References 10 publications

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“…The second case is the pile ended in the sand layer as shown in Fig. (3) and the last case represents floating pile. That is, the pile passes through the lower plate and not resting on any soil.…”

Section: The Experimental Programmentioning

confidence: 99%

Behavior of Piles During Soil Consolidation

Elsakhawy

El-Latief

2010

ERJ. Engineering Research Journal

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Piles driven into soft clay are often subjected to downdrag force. The downdrag force develops negative skin friction on the pile shaft. Negative skin friction is the most common problem in the design and construction of pile foundations in soft soil. Depending on the relative movement of the pile soil system, positive and negative skin friction are developed on pile shaft. Neutral plane is defined as the depth at which the relative displacement between the pile and the soil is zero. This paper presents a study on the behavior of pile during soil consolidation. The experimental work was developed to analyze the negative skin friction and the location of the neutral plane on a single pile embedded in clay. The clay layer was allowed to consolidate. The study concluded that the neutral plane is located toward the end of the pile as the end bearing increases. The depth of neutral plane increases by increasing pile length.

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Section: The Experimental Programmentioning

confidence: 99%

Behavior of Piles During Soil Consolidation

Elsakhawy

El-Latief

2010

ERJ. Engineering Research Journal

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“…and 3) the structural ULS or structural capacity. The Unified Design Method (Fellenius 2004 addresses each of these limit states including for piles subject to ground settlement. This method requires calculation of the neutral plane and force distribution in the pile when subject to the unfactored dead load and considering the distribution of ground settlement.…”

Section: Introductionmentioning

confidence: 99%

Considerations for measuring residual stresses in driven piles with vibrating wire strain gauges

Bartz

Blatz

2022

Can. Geotech. J.

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Vibrating wire strain gauges are often the preferred technology for measuring strain in driven piles. However, measuring the residual strain after pile driving is challenging to accomplish using vibrating wire gauges. The driving process can cause a shift in the no-load reading from a relaxation of locked-in manufacturing strains in the pile or relaxation of the gauge wire tension. Also, there are temperature effects from installing piles below ground. A test pile program was developed using driven steel H-piles instrumented with vibrating wire strain gauges. The piles were subjected to dynamic forces by striking against a steel plate in attempt to relax the locked-in manufacturing strain prior to installation. The strain gauges and thermistors were connected to a data logger during pile driving to record strain and temperature changes following installation. It was observed that applying a dynamic impact to the piles prior to installation resulted in a shift of 0 to 5 microstrain. Temperature effects from installing the piles in cooler ground resulted in a shifts of strain in excess of 60 microstrain in some strain gauges. It is concluded that temperature induced shifts to strain must be measured following pile driving to interpret residual stresses.

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“…As a result, the precision of the modified results has become a subject in recent studies. [10][11][12][13] To cope with unfavorable geological conditions and to meet the strict requirements of postconstruction foundation settlements, the majority of high-speed railways end up with a large portion of their length supported on bridges in China. Currently, on the average, the length of the bridges constitutes approximately 50% of some operating lines.…”

Section: Introductionmentioning

confidence: 99%

Experimental measurement of dynamic load parameters for pier pile caps of high-speed railway bridges

Nie

Chen

Leng

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part F:

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Train-induced dynamic responses and loads in bridge pier systems are not well understood. In this study, five different piers from two separate railway bridges were investigated experimentally. The dynamic responses and loads at the bridge beam ends, pier tops, and pile caps were measured by considering various train speeds. The frequencies of the dynamic loads on pile caps were also analyzed. The results show that the induced dynamic response decreases significantly with the descending pier height. The train-induced vertical dynamic displacements are related to the axle loads and the stiffness of the pile foundation and foundation soils. The accelerations at pier tops and pile caps are very similar but noticeably less than those at beam ends. The train-induced vertical dynamic loads on pile caps increase with the total span length. The measured change of dynamic forces (ÁQ) is approximately 20 À 30% of the measured peak loads (Q). In addition, the results show that the frequency (f) varies linearly with the train speed rather than with the bridge span length.

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Unified Design of Piled Foundations with Emphasis on Settlement Analysis

Cited by 44 publications

References 10 publications

Behavior of Piles During Soil Consolidation

Behavior of Piles During Soil Consolidation

Considerations for measuring residual stresses in driven piles with vibrating wire strain gauges

Experimental measurement of dynamic load parameters for pier pile caps of high-speed railway bridges

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