强夯加固地基土振动传播特性及隔振孔隔振分析

随着强夯法的广泛应用,强夯引起的环境振动问题越来越受到重视,通过理论分析,进行数值模拟,通过与实际施工情况进行比对,确认模拟的有效性。然后通过模拟改变单一变量,研究了强夯施工中的施工参数夯锤锤径、夯击能组合对环境振动的影响,并采用同样的方法,分析非连续性隔振屏障,隔振孔的三项参数孔径、孔间距及孔深,对于隔振效果的影响。发现同等锤重条件下,大锤径有利于减小环境振动,同等夯击能下,轻锤高落有益于减小环境振动;隔振孔孔深达到一定值时,孔径和孔间距比值越大,隔振效果越佳。研究结论对于强夯施工中的环境振动控制具有一定的参考价值。

Analysis of Vibration Propagation Characteristics and Effect of Vibration Isolation Holes in Soil Foundation Reinforced by Dynamic Consolidation

With the wide application of dynamic compaction method, the problem of environmental vibration caused by dynamic compaction get more and more attention. Through theoretical analysis and numerical simulation, the validity of the simulation is confirmed by comparing with the actual construction.Then study the effects of the compaction parameters include hammer diameter and tamping energy combination in the construction of tamping on environmental vibration by change the single variables in simulation,It was found that the bigger hammer diameter with the same weight and light hammer with higher drop distance is beneficial to reduce environmental vibration ; At the same way , The effect of three the parameters of vibration isolation hole which belong to discontinuous barriers include diameter,spacing and depth on the vibration isolation are analysised.The results demonstrated that the greater ratio of diameter to pitch of holes is better to effect of the vibration isolation when the depth of holes is constant.The research has guiding significance for guiding the construction of dynamic compaction and controlling the vibration of the environment.