冻土区桥梁桩基础设计方法与试验研究综述

REVIEW OF DESIGN METHOD AND EXPERIMENT ON BRIDGE PILE FOUNDATION IN PERMAFROST REGIONS

冻土区桥梁桩基在施工时面临冻土融化-回冻,运营期间需抵御冻胀、融沉等作用。目前已出现的冻土桩基病害导致桥梁发生纵向偏移、整体、局部下沉等。青藏铁路在冻土桥梁桩基方面取得了一定的发展,铁路桥梁桩基也有相应的规范,但公路桥梁特别是新建的高速公路桥梁桩径较大,目前设计方法还有待研究。故对国内外冻土桩基设计理论、长期承载能力研究、现场试验资料进行回顾和梳理,指导冻土区公路桥梁桩基设计。

Bridge pile construction in permafrost region would undergo thawing-freezing of the soil nearby. During bridge operation, the pile need to resist frost heave and settlement. The observed problems of the pile in frozen ground result in displacement and non-uniform settlement of the bridge.Qing-Tibet railway made a development on pile design in permafrost region, there were accordingly provisions on pile design. While the new-built pile diameter was larger than railway bridge. Literatures on the design theory, long-term service and experiments in site were reviewed and categorized. Road bridge pile design in frozen ground would be further refined based on the review.