岩溶地区桥梁嵌岩桩基承载力探究

通过大型岩土有限元分析软件Midas/GTS NX,对岩溶地区桥梁嵌岩桩基进行承载力数值仿真模拟,分析了不同顶板厚度对岩溶地区桩基极限承载力的影响。结果显示:桩基极限承载力随溶洞顶板厚度的增加而增加,但几何尺寸大于2.5倍桩径后影响不明显。在保证必要的嵌岩深度的条件下,岩溶地区桥梁桩基嵌岩深度应遵循"宜浅不宜深"的设计原则。工程实例分析中,通过有限元数值仿真模拟,确定了岩溶地区桥梁桩基设计深度和岩溶顶板厚度,具有一定的理论与工程实用价值。

STUDY ON BEARING CAPACITY OF ROCK SOCKETED PILE FOUNDATION IN KARST AREA

In this paper,it use the finite element analysis software Midas/GTS NX to simulate the bearing capacity of rock socketed piles in Karst Area,and analyzed the different roof thickness effects on the ultimate bearing capacity of pile foundation in Karst Area.The result shows:the ultimate bearing capacity of pile foundation increased with the increase of the thickness of cave roof,but after the geometry size is greater than 2.5 times the pile diameter the effect is not obvious.Under the condition of the necessary rock-socketed depth,bridge pile foundation in karst area,rock-socketed depth should follow the design principle of "appropriate shallow should not be deep".Engineering example analysis,through the finite element numerical simulation,determine the design depth and karst roof thickness of bridge piles in karst area,it has some certain theoretical and engineering practical value.