Results 251 to 260 of about 2,698,714 (295)

Multi-functional minor pilins coordinate type IV pilus assembly, adherence, motility, and DNA uptake in the pediatric pathogen <i>Kingella kingae</i>. [PDF]

mBio
Yount TA, Porsch EA, St Geme JW.
europepmc   +1 more source

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Tip Shape Effect on Screw Pile Installation and Ultimate Resistance

Lecture Notes in Civil Engineering, 2021
In the field of deep foundations, the screw pile is one of the new ways of construction that can support infrastructure against extreme weather events. Moreover, its eco-friendly installation mechanics that involve quick installation, minimum noise and vibration; no wastage of material and reusability makes it more efficient than conventional piling ...
Adnan Anwar Malik, Jiro Kuwano
exaly   +3 more sources

Numerical simulation of particle flow code for pile tip resistance and lateral friction to jacked piles down in sand soil

2011 International Conference on Electric Technology and Civil Engineering (ICETCE), 2011
Based on the particle flow code and PFC program, this paper simulates the driving course of a jacked pile, analyses the variation of pile tip resistance with driving speed for three kinds of piles which are the flat pile, 120° tapered pile and 60° tapered pile, and analyses the varing curves of pile lateral friction with different driving depth ...
Zhe Ma
exaly   +3 more sources

Estimating static tip resistance of driven piles with bottom pile instrumentation

Canadian Geotechnical Journal, 2012
A technique is presented to estimate static tip resistance of a pile during driving from embedded strain and accelerometer data located one diameter (D) from the bottom of the pile. The approach uses a nonlinear single degree of freedom system to satisfy force and energy equilibrium with a global genetic inversion approach.
Michael McVay, Khiem Tran, Peter Lai
exaly   +3 more sources

Effect of particle size distribution on pile tip resistance in calcareous sand in the geotechnical centrifuge

Granular Matter, 2000
Until recently, the micro mechanical origins of soil behaviour have remained illusive, but it is now known that that the constitutive behaviour of a soil is largely determined by its particle size distribution. This paper examines the specific boundary problem associated with the penetration of a model pile into two different gradings of dry calcareous
G R McDowell, M D Bolton
exaly   +3 more sources

Physical and numerical modelling of axially loaded bored piles with debris at the pile tip

Computers and Geotechnics, 2019
For bored piles, a careful cleaning work must be implemented to minimize the trapped debris in the drilled hole; otherwise, the presence of debris can result in the soft toe effect, influencing the axial resistance.
Pengpeng Ni, Xuanming Ding, Guoxiong Mei
exaly   +2 more sources

Load-settlement behaviour of bored piles with loose sediments at the pile tip: Experimental, numerical and analytical study

Computers and Geotechnics, 2018
An elevated raft technique is proposed for cast-in-place bored piles, where loose sediments and excavation debris at the pile tip can be compressed by the applied load from the superstructure.
Pengpeng Ni, Guoxiong Mei
exaly   +2 more sources

Field test on pile tip resistance of closed-end jacked pipe pile penetrating into layered foundation

, 2018
In the layered soil foundation mainly composed of silty clay and silty clay, test piles with full cross-section pressure sensors installed at the end of piles are used to continuously and intensively collect pile tip resistances in the whole penetrating ...
S.-C. Yang, My Zhang, Y.-H. Wang, S. Sang, D. Miao   +4 more
semanticscholar   +2 more sources

Field Study on Bearing Characteristics of Combined Side-and-Tip Grouting Bored Pile in the Lower Flood Plain Area of the Yellow River

International Journal of Civil Engineering
Wenbo Zhu, guoliang Dai, Weiming Gong
exaly   +2 more sources

Drilled shafts in sand: failure pattern and tip resistance using numerical and analytical approaches

International Journal of Geotechnical Engineering, 2021
Drilled shafts are one of the most important types of pile foundations. Several researchers have suggested different soil failure patterns for driven piles; however, for drilled shafts, this issue is inadequately addressed in the literature.
Majid Jazebi, M. Ahmadi
semanticscholar   +1 more source