桥梁桩基竖向承载特性试验研究

Experimental Study on Vertical Bearing Features of Bridge Foundation

喀斯特地形区域的水文地质情况十分复杂,为了控制高速公路的建设成本,尽可能地满足沿线村镇的出行需求,大部分桥梁桩基需要修筑在斜坡上。喀斯特地形流水侵蚀严重,坡面经常发生滑移,因此桥梁桩基常年受到水流的冲刷。基于国内外对喀斯特地区水流冲刷桩基的研究,结合桩基竖向承载机理,建立了桩基冲刷过程计算模型,分析了冲刷对竖向承载力的影响,并结合试验数据进行验证。研究表明:有限元计算结果与试验数据吻合度较高,桩基冲刷计算模型可以较好地对桥梁建设进行评估。

The geological condition and hydrologic regime of Karst are extremely complicated sophisticated. To control the cost of highway construction as well as to Satisfy the travel demand of the neighbo and rhood to a large extent, most of the bridge foundations are built on slopes. The earth in Karst region is corroded heavily, thus slippages occur frequently. The bridge foundations are eroded by flows throughout the year. According to researches on eroded bridge foundations at home and abroad, a calculation model describing the whole erosion process has been developed. At the same time, influences brought by erosion on vertical bearing capability of the bridge foundation are analyzed and tested in accordance with test data. The research shows that the result calculated by finite element method coincides with the test data and the calculation model is relatively a better choice for the evaluation of bridge construction.