下伏岩溶与桩基耦合作用研究

为探求下伏岩溶与上方桩基之间的耦合作用，对岩溶顶板与桩基作用体系进行抽象概化，建立8种力学模型，基于弹性力学薄板理论及材料力学梁理论进行理论力学分析，并结合工程实践对比分析各力学模型下岩溶顶板安全厚度及桩基极限承载力。计算结果表明：不同力学计算模型适用于不同实际工程；同一条件下各力学模型计算结果差别较大。因此，合理选择适合于实际工程的溶洞顶板及桩基作用体系力学模型至关重要。

Research on Coupling Effect of Underlying Karst with Pile Foundation

In order to seek the coupling effect between underlying karst and pile foundation above, this paper performs abstraction of interaction system between karst top plate and pile foundation and establishes 8 mechanical models, conducts theoretical mechanic analysis based on elastic mechanics plate theory and material mechanics beam theory, and comparatively analyzes safe thickness of karst top plate and limit bearing capability of pile foundation under various mechanical models. The results of calculation show that different mechanical models are applicable to different actual projects; the calculated results of various mechanical models under the same condition are quite different. Therefore, reasonable selection of mechanical models for interaction system between karst top plate and pile foundation suitable for actual projects is critical.