The basic construction of bored pile under the lim-estone karsts geological conditions has a certain difficulty. In this article, the author introduces the construction methods of overpass main road of the Guangzhou-Foshan Expressway to tel us the methods and countermeasures of bored pile foundat-ion construction under the limestone karsts geological conditi-ons.% 在灰岩地区岩溶地质条件下进行钻孔桩基础施工是具有一定难度。本文作者通过对广佛高速公路主路跨线桥施工方法的介绍，向我们说明了在灰岩地区岩溶地质条件下钻孔桩基础施工的方法与对策。
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