岩溶区摩擦桩桩长优化设计方法及其应用

为优化岩溶区桥梁摩擦型桩基的设计计算，针对湖南省衡桂高速公路沿线岩溶区部分桥梁采用的摩擦桩进行桩长优化分析与计算，基于桩端不同的支撑条件与模型给出了2种不同的桩长计算方法，同时也给出了桩端嵌岩深度的优化确定方法。工程实例对比分析表明：与原设计方案相比，除极少部分桩的桩长保持不变或略有增加外，大部分桩的桩底标高得到提升，相应的桩长明显降少，达到了方便施工、缩短工期及节约成本等目的。

Optimization Design Methods of Friction Piles in Carst Area

In order to investigate the optimization methods of friction pile foundations of bridge in kars area, the length of friction piles used in some bridges of the highway from hengyang to guiyang in Hunan province has been optimized and calculated. According to the various supporting conditions under the pile tip and calculation model, two different optimization design methods of the pile shaft length were put forward with the calculation method of socketed depth in the bedrock given as well. A comparative a- nalysis shows that, compared with the former design plans, besides only a few piles was lengthened a lit- tle, most other piles have been shortened obviously, from which more convenient construction tech- niques, shorter construction periods and cost saving have been achieved.