Abstract
The differences in development and situation of karst caves lead to two kinds of karst caves, and the karst cave may be on the pile side or at the pile bottom, which has a different influence on the bearing capacity of pile foundation. The paper presents a numerical analysis of the influence of karst caves at pile side on the bearing capacity of super-long pile foundation in karst areas. According to the size of pile foundation of a real bridge project, this paper modelized karst caves and investigated the karst cave from the effect of length, height, and thickness of roof on horizontal and vertical bearing capacity of pile foundation. The main conclusions can be drawn as: when the horizontal displacement at the top of pile foundation is greater than 0.05 m, the horizontal load is correlated positively with the length of karst cave; when the vertical displacement is greater than 0.07 m, the vertical load is correlated negatively with the thickness of the roof of karst cave. However, the height of karst cave has little effect on the bearing capacity; also the existence of karst cave has little influence on the dynamic response of pile foundation. The results of this study can be important with reference to the design and construction of pile foundations in karst areas.
Highlights
Mathematical Problems in Engineering width to pile length, and so on), pile-forming technology, types and properties of the soil around piles, change of soil profile, load magnitude and duration, and so on
Chen et al conducted a numerical simulation of pile foundation in karst areas and studied the effect of amount, size, and interval of karst caves on bearing characteristics of pile foundation, pointing out that the number of karst caves is positively correlated with the negative friction of pile foundation [7]
Researchers have carried out the corresponding studies to improve the calculation model and the determination method of parameters according to the theoretical analysis method of the dynamic response of pile foundation and carry out the dynamic analysis of bridge structure based on multipile foundation model [8,9,10,11]
Summary
(1) e geological environment is the main factor affecting the mechanical properties of geotechnical engineering. The studies on the tests of pile foundation in karst areas are almost based on specific engineering examples and geological conditions, which are not systematic or universal. E wide application of rock-socketed piles with large diameters makes it necessary to study the bearing mechanism and load transfer mechanism between piles and rocks, which can make the design of pile foundations in karst areas more reasonable. This paper focuses on the bearing capacity of pile foundations in karst areas and the existing formulas are not suitable. To solve this kind of complex problem, the FE analyses were taken in this paper
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