Abstract
By using finite element software, the influence of different karst cave span on the bearing characteristics of bridge foundation is analyzed. It is found that when other conditions are certain, with the increase of karst cave span, the ultimate bearing capacity presents a decreasing trend, and the lateral friction of pile drops steeply within the range of karst cave and decreases to a greater extent, showing a certain degree of depth effect, and the end resistance proportion also increases. The results show that when the span of the karst cave is more than 9m, the lateral friction resistance within the range of the karst cave of the pile body drops sharply. The research results can further deepen and perfect the design of pile foundation in karst development area and guide the construction, which has certain theoretical significance and engineering application value.
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