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（福建省廈門(mén)市公路局，廈門(mén) 361009）

［摘要］通過(guò)對(duì)某填海工程吹填砂地基進(jìn)行強(qiáng)夯處理的現(xiàn)場(chǎng)試驗(yàn)，對(duì)夯坑沉降及夯點(diǎn)周?chē)乇碜冃?、?chǎng)地平均沉降量、孔壓的增長(zhǎng)和消散、強(qiáng)夯振動(dòng)等進(jìn)行監(jiān)測(cè)，然后采用載荷試驗(yàn)，重型動(dòng)力觸探（N_63.5）、標(biāo)準(zhǔn)貫入、瑞利波波速測(cè)試等原位測(cè)試方法對(duì)地基的加固效果進(jìn)行評(píng)價(jià)，在此基礎(chǔ)上，給出了地基強(qiáng)夯參數(shù)，以供指導(dǎo)施工。通過(guò)試驗(yàn)研究可以了解強(qiáng)夯對(duì)提高吹填砂地基承載力的效果、孔隙水的響應(yīng)規(guī)律、地基的振動(dòng)影響等，有利于揭示強(qiáng)夯加固砂地基的特性，為我國(guó)沿海地區(qū)的“填海造地”工程提供了經(jīng)濟(jì)有效的地基處理方法和經(jīng)驗(yàn)。

［關(guān)鍵詞］強(qiáng)夯；地基處理；試驗(yàn)研究

Experimental study on backfill sand foundation by dynamic compaction

Shi Youzhi

(Xiamen Highway Bureau, Xiamen 361009，China)

Abstract:According to backfill sand foundation of large reclaimed land from sea，a series of dynamic compaction tests were performed. Settlement and ground deformation around ramming points, average settlement of fields, pore water pressures and vibration were monitored， and compaction effectiveness was in-situ tested by load test, heavy duty dynamic penetration test, SPT and Rayleigh wave test. The consolidation effect of foundation after impact was evaluated. Finally, the reasonable impact compaction parameters were recommended. In addition, the property of backfill sand foundation by dynamic compaction can be explained, such as bearing capacity of foundation, the vibration of pore water pressure, the vibration produced by heavy tamping and its influence on environment. It will be propitious to sea reclamation engineering.

Keywords:dynamic compaction; ground treatment; experimental study