Selection of pile foundations in karst areas
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摘要: 针对 岩溶地区不良地质作用较发育,地质条件复杂,且长期以来一直未能找到成熟有效的、适应岩溶地基的桩基类型及施工方法的情况,概括了岩溶地区桩基应用现状,通过深圳龙岗爱地花园二期和盛龙花园二期桩基设计的工程实践,探讨岩溶地区桩基选型,提出若干建议。爱地花园二期针对溶岩埋藏较深的情况,利用黏土对预制桩承载力的时效性,采用预应力管桩作为摩擦桩,不触及基岩,从而避开不良地质的影响;盛龙花园二期针对溶岩埋藏较浅的情况,采用预应力管桩作为端承群桩形成桩筏,从而分散了不良地质带来的工程风险。Abstract: Aiming at the case that there have been no efficient and mature pile foundations and corresponding construction methods for karst areas with poor and complex geological conditions for long time, the state-of-the-art of pile foundations applied in karst areas is summarized, and the selection of piles is discussed. A number of recommendations are proposed based on the practical engineering experience from the design and installation of the pile foundations in Aidi Garden Phase II and Shenglong Garden Phase II in Longgang of Shenzhen. Particularly, Aidi Garden Phase II, constructed in deep karst area, exploits the aging effect of clay for supporting precast piles. It adopts the prestressed concrete pipes as friction piles, which do not touch the karst and thus eliminate its adverse impact. On the other hand, Shenglong Garden Phase II is constructed in shallow karst area, where the prestressed concrete pipes are employed as end-bearing pile groups to form piled raft, dispersing the risk of unfavorable geology.
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