高层结构与岩溶洞穴地基基础共同作用分析

岩溶地基是一种复杂地基，在岩溶地基上建设高层建筑需要较准确的分析以提供设计依据．高层建筑与地基基础共同作用的分析方法能比较准确反应结构及地基的受力，而有限元法能有效地进行共同作用分析．为此，利用大型有限元软件ANSYS对岩溶地区的高层建筑进行共同作用分析，并与不考虑共同作用的常规分析方法进行对比，并探讨了共同作用对上部结构、地基及基础的影响．研究结果表明：对于岩溶地基而言，共同作用对柱产生的次应力较小，但个别角柱次应力较大；剪力墙的次应力较大，而且其布置方式对共同作用有较大影响，此应力随楼层增加衰减很快；对于岩溶地基而言，筏板基础是比较适合的基础形式，在共同作用中起很大作用．

Analysis on Superstruct-foundation-soil Interaction on Karst Region

Karst region is a kind of complicated groundsill.To design tall-buildings built on karst subgrade,precise analyse result is needed.The method based on superstruct-foundation-soil interaction theory can precisely calculate the(internal) force of structural,foundation and groundsill.The method of finite element is an effective way to solve the problem.Finite element analys is software ANSYS is used to analyze superstruct-foundation-soil interaction on Karst Subgrade.Through comparing methods based on superstruct-foundation-soil interaction with traditional analysis method(in this condition,superstruct-foundation-soil interaction is not taken into account),the interactional effect to structure,foundation and rock are discussed.Through the analysis,several conclusion can be drawn as follows: The side stress of column is small for buildings on Karst region,but the side stress of corner columns is much larger than the others.The side stress of shear wall is great and the location of shear wall is significant for the interaction.Slab foundation is effective for Karst region,it plays a great role on interaction.