Abstract
This paper will employ the transparent soil experiment technology to explore the influences of shallow necking on the vertical bearing capacity of single pile with cap. Model experiment is carried out on one intact pile and nine shallow necking piles. The load-settlement curves of all piles are obtained, which are used to study bearing characteristics of piles. The displacement fields of soil around piles are employed to investigate the reasons for the loss of vertical bearing capacity of piles with shallow necking. The vertical bearing capacity is greatly reduced which is caused by shallow necking. When the axial dimension of necking is the same, the larger the radial size is, the greater the loss of vertical bearing capacity is. When the radial dimension of necking is the same, the greater the axial size is, the greater the loss of vertical bearing capacity is. The soil near the pile shaft and under the pile cap produces a large area of vertical downward deformation, which causes the relative displacement between the pile shaft and the soil to greatly reduce. Therefore, it is easy that the necking piles with caps develop negative friction, which causes the vertical bearing capacity of piles to reduce. When the radial dimension of the shallow necking is 80% of pile diameter, the pile is easy to be damaged.
Highlights
With the rapid development of underground space, pile foundation is widely used in civil engineering because of its high bearing capacity, small settlement, and so on
Necking pile is one of the main defects which can cause the vertical bearing capacity of piles to lose because load transmission cannot be performed effectively [2]. erefore, it is of great engineering and economic significance to study the bearing characteristics of necking piles
Based on transparent soil technology, model experiments are carried out on one intact pile with cap and nine shallow necking piles with caps. e load-settlement curves and the displacement field diagram of soil around the pile are obtained. e vertical bearing capacity of intact pile and necking piles and the load transfer mechanism are investigated through soil deformation around the piles
Summary
College of Civil Engineering, Henan University of Technology, Zhengzhou 450001, China. Is paper will employ the transparent soil experiment technology to explore the influences of shallow necking on the vertical bearing capacity of single pile with cap. E displacement fields of soil around piles are employed to investigate the reasons for the loss of vertical bearing capacity of piles with shallow necking. E vertical bearing capacity is greatly reduced which is caused by shallow necking. When the axial dimension of necking is the same, the larger the radial size is, the greater the loss of vertical bearing capacity is. When the radial dimension of necking is the same, the greater the axial size is, the greater the loss of vertical bearing capacity is. Erefore, it is easy that the necking piles with caps develop negative friction, which causes the vertical bearing capacity of piles to reduce. When the radial dimension of the shallow necking is 80% of pile diameter, the pile is easy to be damaged
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