后注浆嵌岩桩竖向抗压承载力研究
发布时间：2019-06-22 14:23
【摘要】：桩使用常见、广泛,具有悠长的历史。桩基工程现已较成熟,但由于拟建场地地质条件截然不同,使得桩基理论研究与工程实践结合面临巨大挑战。后注浆嵌岩桩是在嵌岩桩的基础上配合合理的后注浆技术,克服嵌岩桩在施工过程中的固有缺点,使嵌岩桩的承载力得到极大的提高,有很好的应用价值和经济意义。本文针对丹东地区拟建工程所在地的特殊地质条件,提出采用后注浆嵌岩桩的施工工艺,并对整个施工工艺流程、后注浆参数的选择及需要注意的问题给与详细的介绍。根据《建筑桩基技术规范》(JGJ 94-2008)及当地的经验计算公式,并结合工程实践,估算嵌入中风化花岗岩和强风化花岗岩的后注浆嵌岩桩的单桩竖向抗压极限承载力理论计算值。对现场静载试验进行详细地剖析归纳,研究不同桩长情况下的后注浆嵌岩桩的桩身轴力、桩侧阻力、桩端阻力、桩-岩段阻力、桩-土段阻力的分布规律,根据Q-S曲线及相关规范,得出嵌入中风化花岗岩和强风化花岗岩的后注浆嵌岩桩的单桩竖向抗压极限承载力的实测值。通过FLAC3D有限差分软件,仿真模拟试验桩的受力情形,得到试验桩单桩竖向抗压极限承载力模拟值,对照仿真、实测值和计算得到的三个单桩竖向抗压极限承载力数值,验证FLAC3D对后注浆嵌岩桩的仿真可行性,从而得出适合丹东地区的后注浆嵌岩桩施工工艺,并确定后注浆嵌岩桩的强风化花岗岩和中风化花岗岩的侧阻增强系数βSi和端阻增强系数βP的取值范围,为丹东地区的桩基础和桩身配筋设计提供借鉴参考。
[Abstract]:Piles are commonly used, widely used and have a long history. Pile foundation engineering is now more mature, but because the geological conditions of the proposed site are very different, the combination of pile foundation theory research and engineering practice is facing great challenges. Post-grouting rock-socketed pile is a reasonable post-grouting technology on the basis of rock-socketed pile to overcome the inherent shortcomings of rock-socketed pile in the construction process, so that the bearing capacity of rock-socketed pile can be greatly improved, which has good application value and economic significance. In view of the special geological conditions of the proposed project in Dandong area, this paper puts forward the construction technology of post-grouting rock-socketed pile, and introduces in detail the whole construction process, the selection of post-grouting parameters and the problems needing attention. According to the Technical Code of Building pile Foundation (JGJ 94 鈮，
本文编号：2504665
[Abstract]:Piles are commonly used, widely used and have a long history. Pile foundation engineering is now more mature, but because the geological conditions of the proposed site are very different, the combination of pile foundation theory research and engineering practice is facing great challenges. Post-grouting rock-socketed pile is a reasonable post-grouting technology on the basis of rock-socketed pile to overcome the inherent shortcomings of rock-socketed pile in the construction process, so that the bearing capacity of rock-socketed pile can be greatly improved, which has good application value and economic significance. In view of the special geological conditions of the proposed project in Dandong area, this paper puts forward the construction technology of post-grouting rock-socketed pile, and introduces in detail the whole construction process, the selection of post-grouting parameters and the problems needing attention. According to the Technical Code of Building pile Foundation (JGJ 94 鈮，
本文编号：2504665
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