不同夯锤落距对软黏土压实效果的影响分析

采用PFC颗粒离散元法对软黏土中的夯实过程进行数值模拟，并对不同夯锤落距的夯实效果进行了对比分析，得出了各夯锤落距对应的夯坑沉降值及变化规律:①夯锤落距最优值，第一遍夯实时为8 m；第二遍夯实时为13 m。②以单次夯沉量小于5 cm为夯击完成标准，该软黏土的最佳夯击次数第一遍为5击，第二遍为6击。③夯击后土体可分为挤密区、压实区、隆起区及未影响区，夯击能量扩散角α为30°。

Analysis of the Impact of Different Tamper Fall Distance on the Compaction Effect of Soft Clay

PFC particle discrete element method was used to carry out numerical simulation of compaction process in soft clay and the compaction effect of different tamper falling distance was compared and analyzed, and the corresponding tamper pit settlement value and change rule of each tamper falling distance was obtained. The results are as follows:① the optimum value of the tamper fall distance is 8 m in the first tamping and 13 m in the second tamping. ② with a single knockdown of less than 5 cm as the tamping completion criterion, it can be determined that the best number of tamping for the soft clay is 5 hits for the first time and 6 hits for the second time. ③ the soil after tamping can be divided into compacting area, compaction area, upwelling area, and unaffected area. The tamping energy spread angle α is 30°.