夯击能应用于高填土地基的一些探讨

DISCUSSION ON SOME PROBLEMS OF APPLICATION OF TAMPING ENERGY TO FOUNDATION WITH LARGE FILL THICKNESS

大量工程实践表明 ,对填土及软土地基进行夯击加固时 ,夯击能的选取不仅与填土层的厚度有关 ,而且与填土层下覆土质的工程地质条件等因素密切相关。本文结合南方某港口填土地基加固工程实例 ,对在高填土地层中夯击能的使用问题进行了探讨 ,分析了当填土层的下卧层分别为坚硬土层和软弱土层、以及当填土层的填料分别为粗颗粒料和含水量较高的粘性土等细粒填料时 ,填土层加固的机理 ,制定了在不同条件下选取夯击能的标准 ,并根据现场检测资料 ,评价了该场地的地基加固效果 ,进一步验证了所确定夯击能标准的可靠性。

A lot of engineering practice indicates when the dynamic compaction is used to reinforce founation of fill, the selection of tamping energy is not only related to the thickness of fill, but also to the conditions of soil and groundwater table, etc. In this paper, a discussion is made on the use of tamping energy to reinforce the foundation with large fill thickness in southern China. If the substratum of the fill is either hard or soft, and if the filling material is coarse aggregate and fine aggregate that is cohesive soil with high water content, respectively. The selected standard of tamping energy is established in different conditions. From the data of field monitoring, an evaluation is made of the effectiveness of foundation reinforcement by adequately determining the tamping energy, so that the better consolidation effects could be achieved.