Abstract
In order to provide reference for the engineering design in the area with large wind, water flow and other horizontal loads, the experimental study on the horizontal bearing capacity of composite foundation under three different working conditions was carried out in this paper, which includes cap-single pile, cap-9 piles and enlarged cap-9 piles. The results show that under the condition of cap-9 piles, the group pile effect coefficient is 1.17, and the load sharing ratio of the back piles is the largest, and the middle and front piless decrease sequentially. Also, with the increase of horizontal load, the load sharing ratio of the back pile increases while the middle and front piless is decremented. Under the condition of enlarged cap-9 piles, the group pile effect coefficient is 1.36, which is 16.24% higher than that of the cap-9 piles, which means the horizontal resistance is obviously enhanced. At the same time, compared with the cap-9 piles, the load sharing ratio of the back pile is reduced while the middle and front piless is increased, which means the stress of pile body tends to be more uniform.
Highlights
In traditional design, cap-group pile composite foundation is mainly vertical bearing, but it is subjected to horizontal loads in the actual engineering especially in coastal areas, such as wind, river and other horizontal loads, and engineering disasters caused by this often occur
The model test on horizontal bearing characteristics of cap-group pile with three different forms are carried out in the present paper, which in order to explore the influence of enlarged cap on the horizontal bearing capacity and group pile effect coefficient
The curve of horizontal load and displacement of single pile is shown in figure 3
Summary
Cap-group pile composite foundation is mainly vertical bearing, but it is subjected to horizontal loads in the actual engineering especially in coastal areas, such as wind, river and other horizontal loads, and engineering disasters caused by this often occur. The corresponding research methods include theoretical research, experimental research and numerical analysis. The theoretical research includes elastic theory method, pile group efficiency method, and p-y curve reduction method [1,2,3]. Based on the above research methods, the scholars have carried out a series of studies on the horizontal bearing capacity of cap-pile [10,11,12,13], and some research results are valuable. The influence of cap size and group pile distribution style on the group pile effect still need further study. The model test on horizontal bearing characteristics of cap-group pile with three different forms are carried out in the present paper, which in order to explore the influence of enlarged cap on the horizontal bearing capacity and group pile effect coefficient
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