陡坡段桥梁基桩嵌岩深度问题研究

Study on socket length of bridge pile in steep slope section

利用数值流形元在处理桩位移及应力不连续问题方面的优越性,重点解决了桩岩接触面分析的数值实现。然后,在合理模拟边坡基桩开挖及选取材料本构模型与参数的基础上,对陡坡路段桥梁基桩的嵌岩深度问题进行了深入探讨。计算表明：边坡桥梁基桩同样存在嵌岩深度问题,当嵌岩达到一定深度后,盲目增加嵌岩深度对承载力的提高已不明显,工程设计建议取2~3倍桩径。

By use numerical manifold method with its maneuverability for disposing of the question of displacement and stress noncontinue, this paper emphatically solved the numerical implementation of the contact analysis for pile and rock, including the detect and confirm of contact relation and open-close iterative method. Then, after imitating excavation of pile and choosing material constitutional model and its parameter rationally, the question of socket length of bridge pile in half road-half bridge section is discussed deeply. The calculation result make sure that slope piles have deep effect also, 2 -3 times of diameter is right.