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冲积层岩溶地区桩基础施工目前在国内是首次出现,它的主要技术难点是由于复杂的连通溶洞在钻孔过程中造成孔内泥浆水头迅速下沉,可能造成孔壁坍塌埋钻事故,采取全护筒二次成孔分级防护的方案,不仅施工速度快,而且充分揭示了桩周的地质情况,为设计和施工提供了可靠的依据,这种方案的成功应用,为同类或近似地质条件下的施工提供了可靠的施工经验。
The construction of pile foundation in alluvial karst area is currently the first time in China. The main technical difficulty is that the mud head of the hole sinks quickly due to the complicated connecting caverns, which may result in the burying of the hole wall. The scheme of secondary protection of casing into holes is not only fast in construction speed, but also reveals the geological conditions of pile circumference and provides a reliable basis for design and construction. The successful application of this scheme is under the same or similar geological conditions The construction provided a reliable construction experience.