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为研究高填方路堤分层压实过程中的超固结应力历史,对路基回填土分别开展室内击实和一维固结试验。通过采用两种自制击样装置以及标准重型击实钻芯取样等3种方式制备压实土样,研究击实功、击实冲量、含水率以及压实度等多种因素对路堤回填土超固结应力历史的影响。试验结果表明:相同压实度和含水率的压实土对应的应力历史不唯一,压实过程的单位面积击实冲量越大应力历史越大;当击实功和超固结形成路径都相同,压实土在最佳含水率时压实度最高,对应应力历史最大;当含水率相对最佳含水率上下浮动,压实土的应力历史会降低,且含水率越高,压实度对于应力历史的影响幅度越大。
In order to study the history of overconsolidation stress during high-fill embankment stratified compaction process, indoor compaction and one-dimensional consolidation tests were carried out on subgrade filled backfill respectively. Compaction soil samples were prepared by three kinds of self-made striking devices as well as standard heavy-duty compacted core samples. The effects of compaction, compaction, moisture content and compaction on the embankment backfilling Effect of consolidation stress history. The experimental results show that the corresponding stress history of compacted soil with the same degree of compaction and water content is not unique, and the compaction process with larger compaction impulse has greater stress history. When compaction and super-consolidation path are the same , The compacted soil has the highest compaction degree at the best moisture content and the largest corresponding stress history. When the relative optimum moisture content of the compacted soil fluctuates, the stress history of the compacted soil will decrease, and the higher the moisture content, The greater the impact of stress history.