The Carrying Capacity Analysis of Kunming New Airport Terminal Area Underlying Cave Foundation

There are many factors that affect bearing capacity of Cave foundation, such as Cave depth, the caves diameter (span), spacing vertically adjacent caves and caverns section form the foundation bearing capacity. The way, combined engineering geology analysis with numerical simulation, was applied to analyze the underlying bearing capacity of Cave foundation. According to this way, it concludes that the relationship between the diameter of the upper load and the lower part of the dissolution is smaller when a single cave depth is greater than 2 times, and the impaction of the cave to the top load can be ignored when the spacing of the level of the adjacent cave is greater than one times and the vertical distance is greater than 0.5 times of the span. Besides, the upper part of the maximum load q_max decrease about 6% to 10% from each additional 5% of dissolution rate. When the span is greater than three times of the hole high, the decrease range of the maximum load on the top of foundation is relatively small; on the contrary, the load that vertical type caves can withstand is relatively large.