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本文通过室内模拟强夯试验研究了黄土在动力荷载的作用下其强度变化规律 ,发现强度随夯击次数的增加将出现阶段性变化。初期以单调的递增变化为特征 ,但达到某一界限值后出现了宏、微观变化差异。前者以增幅减缓为主 ,而后者则出现了强度逐渐降低现象。结构分析表明 ,强度的这种变化主要受微结构状态调整制约 ,而土粒尺寸和取向的非均匀化发展以及微观损伤的再扩大是已加固土体强度降低的主要原因。
In this paper, dynamic simulation of dynamic simulation of loess under dynamic load was used to simulate the dynamic compaction test. It was found that the intensity of the loess will change step by step with the increase of the number of tamping. Early monotonous changes are characterized by a monotonous increase, but macroscopic and microscopic differences appear after reaching a certain limit value. The former is dominated by slowing down while the latter is gradually decreasing in intensity. Structural analysis shows that this change in strength is mainly controlled by the state of the microstructure. The non-uniform development of soil particle size and orientation and the re-expansion of microscopic damage are the main reasons for the strength reduction of the consolidated soil.