Abstract：Research purposes:The upgrading project of the old 320 National Road in Kunming city is located in the middle part of the Yunnan － Guizhou Plateau，Its engineering geology belongs to the dissolution Basin with strong karst development．The karst complexity brings about some difficulties in the design of the bridge pile foundation． Based on the design practice of this project，the introduction is given to the formation mechanism and characteristics of karst，the discussion is made on the difficult points in the survey and design of the bridge pile foundation in karst area and the design principles and the design main points are summarized for providing the reference to the similar works．
Research conclusions:The geophysical prospecting should be used for the karst survey along with drilling． The attention should be paid to the study on the geological structure and the survey method and the detailed and accurate survey report should be supplied． The characteristics of the load on the pile should be considered carefully in design．The reasonable parameters for the calculation of the pile' s bearing capacity should be chosen，The reliable method should used to evaluate the stability of the roof and the scientific experiments should be done if necessary to verify the accuracy of the calculation and ensure the engineering quality．
王荣华. 岩溶区桥梁桩基勘察与设计要点分析[J]. 铁道工程学报, 2012, 29(9): 53-58.
WANG Rong － hua. Analysis of Key Points in Survey and Design of Bridge Pile Foundation in Karst Area. 铁道工程学报, 2012, 29(9): 53-58.
Jiang Xianping，Wang Chunlei． Analysis of Safe Roof Thickness of Karst Cavity under Bridge Load in Karst Area［J］． Journal of Railway Engineering Society，2010 (4) :62－65．
Wang Hualao，etc． Research on the Single Rock － Socketed Pile Bearing Capacity Influenced by Karst Caves［J］． Journal of Xi’an University of Technology， 2010(1) : 31－36．
He Chunlin， etc． The Influence of the Cave Characteristics on Pile Bearing Capacity in Karst Area ［J］． Journal of Huaiyin Institute of Technology，2006 (1) :78－81．
Zhao Minghua，etc． Study on Safe Thickness of Rock Mass at end of Bridge Foundation’s Pile in Karst and Worked － out Mine Area ［J］． Rock and Soil Mechanics，2004(1) : 64－68．
Wang Ren，etc． The Comprehensive Evaluation on Roof Stability of Karst Cave under Bridge Foundation［J］． Journal of Highway and Transportation Research and Development，2005(6) : 76－80．
［9］ JTG D63—2007，公路桥涵地基与基础设计规范［S］．
JTG D63—2007，Code for Design of Ground Base and Foundation of Highway Bridges and Culverts［S］．
［10］ GB 50007—2002，建筑地基基础设计规范［S］．
GB 50007—2002， Code for Design of Building Foundations ［S］．
［11］ JGJ 94—2008，建筑桩基础技术规范［S］．
JGJ 94—2008， Technical Code for Building Pile Foundations［S］.
2012, Vol. 29 
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