基于体应变的强夯加固范围研究

发布时间：2018-10-05 15:07

【摘要】：通过数值模拟分析地基的强夯加固效果,把夯后地基土的体应变与工程要求的干密度联系起来,用控制体应变作为评价加固范围的标准。通过对数值模拟及试验数据的分析发现,夯击冲量越大,加固效果越好。相同夯击能可以产生不同加固效果的规律,得出了用夯击冲量替代夯击能作为施工参数的控制标准更为合理的结论。改进了夯锤尺寸影响强夯加固效果的研究方法,分析时固定夯锤厚度比固定夯锤质量更具归一性。研究表明,在土性参数相同的条件下,夯击沉降量仅与单位面积夯击冲量有关,而加固深度不仅与单位面积夯击冲量有关,还与夯锤半径有关。在以控制体应变作为加固范围的评价标准、研究各参数影响规律的基础上,采用量纲分析法得到了加固范围的计算公式,并与工程实例进行对比分析,得到了强夯作用下土的干密度分布特征。所得结论对类似工程具有一定的参考价值。
[Abstract]:Through the numerical simulation analysis of the consolidation effect of dynamic compaction, the volume strain of the compacted foundation soil is related to the dry density required by the engineering, and the control volume strain is used as the standard for evaluating the reinforcement range. Through the analysis of numerical simulation and test data, it is found that the stronger the tamping impulse is, the better the reinforcement effect is. The same ramming energy can produce different rules of reinforcement effect. It is concluded that it is more reasonable to use tamping impulse instead of tamping energy as the control standard of construction parameters. This paper improves the research method that the size of rammer affects the effect of dynamic compaction. The thickness of fixed rammer is more uniform than the quality of fixed rammer. The results show that under the same soil parameters, the tamping settlement is only related to the tamping impulse per unit area, and the depth of consolidation is not only related to the tamping impulse per unit area, but also to the hammer radius. On the basis of studying the influence law of each parameter, the calculation formula of reinforcement range is obtained by using dimensional analysis method and compared with engineering example. The distribution characteristics of soil dry density under dynamic compaction are obtained. The conclusions obtained have certain reference value for similar projects.
【作者单位】：北京航空航天大学交通科学与工程学院;
【基金】：国家重点基础研究发展计划(973计划)(No.2014CB047006) 国家自然科学基金(No.11272031,No.51579005)~~
【分类号】：TU472.31

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