高能级强夯室内模型试验研究  

Research on laboratory model experiment of high energy dynamic compaction

作　　者：张兴元[1,2] 张豫川[1,2] 张可[1,2] 王亚军[1,2] 羊群芳[1,2] 

机构地区：[1]西部灾害与环境力学教育部重点实验室,兰州730000 [2]兰州大学土木工程与力学学院,兰州730000

出　　处：《工程勘察》2011年第9期9-13,18,共6页Geotechnical Investigation & Surveying

摘　　要：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 similarity theory,by designing a laboratory model experiments and using the device,the model test of 3000kN · m,8000kN · m and 10000kN · m level dynamic compaction are studied.The results show that： dynamic stress of the dynamic compaction changes at the bottom of hammer,and at both sides of hammer,the dynamic stress is almost zero.With the increase in the number of tamping,dynamic stress concentration layer is formed in shallow layer of soil at the bottom of hammer,and in the concentration layer,the dynamic stress is more significant increase;When the depth increases,the dynamic stress reduces.When blow count is low,the attenuation rate of the dynamic stress of different dynamic compaction energy levels is consistent.With the increase in the number hit,the attenuation rate of dynamic stress of high energy dynamic compaction is faster than the low-energy dynamic compaction;Low-energy dynamic compaction has effect on the soil on both sides of hammer,but high energy dynamic compaction major reinforced the soil which is below the hammer.

关 键 词：强夯 模型试验 动应力 干密度 

分 类 号：TU473[建筑科学—结构工程]