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基于相似理论,自行设计了室内模型试验装置,利用该装置对3000kN.m8、000kN.m和10000kN.m能级强夯开展了室内模型试验研究。研究结果表明:强夯的动应力在锤底有变化,夯锤两侧的动应力几乎为零。随着夯击次数的增加,在锤底浅层土体形成应力集中层,在该集中层上,动应力的增幅较为明显;动应力随着深度的增加而衰减,击数较低时,不同能级强夯动应力的衰减速度基本一致,随着击数增加,高能级强夯动应力的衰减速度快于低能级强夯;低能级强夯对夯锤两侧的土体有挤密作用,高能级强夯主要加固的土体是夯锤下方的土体。
Based on the similarity theory, an indoor model test device was designed by itself, and the indoor model test of 3000kN.m8,000kN.m and 10000kN.m dynamic compaction was carried out. The results show that the dynamic stress of dynamic compaction changes at the hammer base, and the dynamic stress on both sides of the compaction hammer is almost zero. With the increase of the number of tamping, the stress concentration layer is formed on the shallow hammer soil bottom, where the dynamic stress increases more obviously; the dynamic stress attenuates with the increase of depth, At the energy level, the decay rate of dynamic compaction is basically the same. With the increase of the number of strikes, the decay rate of dynamic compaction of high energy level compaction is faster than that of low-level compaction. Compaction of low- The main reinforcement of the high-level dynamic compaction soil is soil below the rammer.