土石混填路堤强夯加固范围研究

基于常(德)吉(首)高速公路湘西段土石混填路堤强夯加固的大型现场动应力测试的试验成果,通过分析影响强夯加固范围的锤重和落距(夯击能)、夯锤面积、夯击次数、土体类型、干重度、含水量等各种因素,采用量纲分析结合选取修正系数的方法推导出了土石混填路堤强夯加固深度的计算公式;并根据泊松比的定义,建立了强夯加固范围的计算公式.最后通过与已有研究资料和工程实测有效加固深度的对比验算,表明该公式的计算结果与实测结果较吻合.

Study of Reinforcement Range of Dynamic Compaction in Soil-stone Material Embankment

Based on results and analysis of in-situ dynamic stress test that make use of the dynamic compaction technology to embankment of Xiangxi section in Changde-Jishou Freeway which was filled by soil-rock foundation packing material, the formula that determined the effective reinforcement depth was deduced by using dimensional analysis and choosing correction factors after several influencing factors of the effective reinforcement range including the weight of hammer, the highness of hammer, the section area of hammer, the dry density of filler, the type of filler and the moisture content of filler were comprehensively studied. The calculation formula of reinforcement range of dynamic compaction in soil-stone embankment was established based on the definition of Poisson ratio. It is indicated by the results of contrastive analysis that calculation results are close to actual measurement results.