倾斜荷载下高陡边坡桥梁基桩内力计算  

INNER-FORCE CALCULATION OF BRIDGE PILE FOUNDATION IN HIGH-STEEP ROCK SLOPE UNDER INCLINED LOADS

作　　者：赵明华[1] 刘建华[1] 杨明辉[1] 

机构地区：[1]湖南大学岩土工程研究所,湖南长沙410082

出　　处：《岩石力学与工程学报》2006年第11期2352-2357,共6页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金(50578060)

摘　　要：高陡边坡上桥梁基桩既要承受来自上部轴向与水平向的荷载作用,又要抵抗桩侧滑坡推力,具有承重与阻滑双重功能,其受力性状远比抗滑桩利平地上两侧无坡度的单一倾斜受荷桩要复杂得多。在考虑高陡岩质边坡滑坡推力的基础上,根据现场试验得到岩质边坡滑坡推力分布应为两端小、中间大的抛物线形式的规律,提出桩后岩质边坡滑坡体推力按抛物线分布荷载计算模型,进而提出适用于高陡边坡桥梁基桩内力及位移分析的有限差分解,并结合湖南邵怀高速公路K83+745桥梁基桩实测数据分析表明理论与实测结果吻合良好,所提出的针对高陡边坡桥梁基桩内力及位移计算的有限差分法是可行的,深入探讨高陡边坡桥梁基桩内力及位移计算对于推广其工程应用具有理论和工程应用价值。The bridge pile foundation in high-steep rock slope has double function, i. e. bearing vertical and horizontal loads from superstructure and counteracting landslide-thrust from pile foundation side; and the mechanical behavior in the pile in high-steep rock slope is much more complex than that of antislide pile and simplex inclined-loading pile. Considering the landslide-thrust of the high-steep rock slope, the law that the landslide-thrust of the high-steep rock slope has parabolic type is found from in-situ test; and the parabolic distribution loads of the landslide is put forward. The finite difference method is introduced to calculate the displacement and inner-force of the bridge pile foundation in high rock slope under inclined loads. The result from the bridge pile foundation in K83＋745 of Shaoyang--Huaihua Expressway in Hunan Province shows a good agreement with measured result. This indicates that the presented approach is feasible and applicable in engineering practice.

关 键 词：桥梁工程 桩基础 倾斜荷载桩 岩质边坡 内力计算 有限差分法 

分 类 号：U44[建筑科学—桥梁与隧道工程]