Abstract: The interactions of collapsed soil and ground, limiting equilibriuMtheory have been developed to deduce the calculation formula for ultimate bearing capacity of Karsts collapsed foundation. Comparative analysis between beaMand plate spanning is carried out; it is found that the ultimate bearing capacity and shear strength of collapsed soil will play a key role on the uhimate bearing capacity of ground. Owing to the difference of the ultimate bearing capacity, if it is treated with the proper rammed of collapsed soil, the uhimate bearing capacity of foundation will be increased when ground is treated with beaMspanning; nevertheless, the ground ultimate bearing capacity will be not obvious when ground is treated with plate spanning. These results will provide practical value for the design and construction of karst foundation treated by crossing treatment.

Key words: limiting equilibriuMtheory, karst foundation, ultimate hearing capacity

摘要： 通过分析塌陷体(土层)与周未塌陷地基的相互作用，当采用梁、板跨越法处理时结合极限平衡理论对岩溶 地段塌陷地基极限承载力的计算公式进行推导。对比得出：在采用跨越处理(梁或板)措施时，塌陷体的地基极限 承载力、抗剪强度等是影响周围未塌陷地基土的极限承载力的重要因素。由于粱或板跨越处理时其地基的极限承 载力不同，采取夯实(挤密)措施，梁跨越处理时则可相应提高地基土的极限承载力，而板跨越时地基土极限承载力 效果则不明显利用跨越法处理岩溶地区基础具有一定的实用价值

关键词: 极限平衡理论, 岩溶地基, 极限承载力