爆破荷载下软土地基动力响应离心模型试验研究

爆破挤淤处理软基技术具有施工工期短、固结沉降快、地基后期沉降小等优点,已广泛应用于淤泥质海岸工程的地基处理,但目前研究远落后于工程实践。随着爆破离心模拟技术的发展,实现了离心场外对场内引爆装置的控制,为爆破荷载下软土地基动力响应特性的研究提供试验手段。开展3组离心场中不同炸药量的爆破挤淤模型试验,研究爆破的影响区域,建立爆破荷载作用下的挤淤效果与炸药量的关系。试验结果表明,药包炸药量与爆破影响区域密切相关,爆破影响区软土含水率降低、密度增大,且爆破瞬间冲击荷载引起土压力和孔隙水压力的突变。研究成果可为爆破挤淤工程的设计和施工提供试验依据。

Centrifugal model test on dynamic response of soft soil foundation with blasting compaction technology

With the advantages of short construction period, quick consolidation and small post-construction settlement,blasting compaction technology has been widely used in foundation treatment of silt coastal engi-neering, but the research is far behind engineering practice. With the development of blasting centrifugal simulation technology, the control of the detonation device outside the centrifugal field is realized, which provides the experimental method for the dynamic response characteristics of the soft soil foundation under the blasting load. The amount of explosives in the explosive area is closely related to the area affected by the explosion. The water content of the soft soil in the affected area is reduced and the density increases, and the sudden load of the explosion causes the abrupt change of earth pressure and pore water pressure. The research results can provide experimental basis for the design and construction of blasting compaction engineering.