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结合青临高速公路强夯加固废弃铁矿渣高填方路基工程,在实验段埋设48个土压力计,采用不同夯击能(2 000、2 250、2 500、2 800 kN.m)对设计夯点进行多次夯击,通过采集仪得到的数据,分析强夯时动应力的扩散规律。实验结果表明:强夯加固废弃铁矿渣路基的效果比较明显,强夯引起的动应力也很明显;锤底动应力的消散速度极快,加上余波仅有0.5 s左右的时间;不同夯击能引起的动应力不同,夯击能越大,动应力值也越大;动应力在竖向的影响距离远大于径向,锤底8 m仍有10 kPa以上的动应力;有效加固深度的临界动应力值为20 kPa;动应力在径向的衰减速度快于竖向,有效加固宽度约3 m;随着夯击次数的增加,在有效加固范围内动应力的增加比较明显,但在3击后基本保持稳定。实验结果可为今后相似条件下强夯加固工程施工参数的设计提供参考。
In combination with Qinglin Expressway strong tamping to reinforce the waste iron slag high embankment project, 48 earth pressure gauges were buried in the experimental section, with different tamper energy (2 000,2 250,2 500,2 800 kN.m) Design tamping points for several times by tamping, the data obtained by the acquisition instrument, analysis of dynamic compaction dynamic diffusion rules. The experimental results show that the effect of dynamic compaction to reinforce the abandoned iron slag roadbed is obvious, and the dynamic stress caused by dynamic compaction is also obvious. The dynamic stress dissipation at the bottom of the hammer is extremely fast, with only about 0.5 second afterglow. The dynamic stress caused by impact can be different. The larger the impact energy is, the greater the dynamic stress is. The influence of dynamic stress in the vertical direction is much larger than that in the radial direction. Dynamic stress above 10 kPa is still at 8 m at the bottom of the hammer. The critical dynamic stress is 20 kPa. The dynamic stress is attenuated in the radial direction faster than the vertical direction, and the effective reinforcement width is about 3 m. With the increase of the number of tamping, the increase of dynamic stress in the effective reinforcement range is obvious. However, After 3 hits basically remained stable. The experimental results can provide reference for the design of the dynamic compaction reinforcement engineering construction parameters under similar conditions in the future.