风暴浪导致的黄河口水下土体破坏试验研究

Test of Soil Failure Under Storm Wave Loadings on the Yellow River Subaqueo us Delta

本文试验利用取自黄河水下三角洲的样品 ,重塑后铺设水槽底床进行水槽试验 ,并利用原状土进行动三轴试验 ,2种试验均测定土体内的孔隙水压力。根据各种情况下孔隙水压力的变化记录 ,表明土体破坏同时其孔隙水压力产生骤变。将本文试验结果与在黄河水下三角洲不稳定区的原位沉积动力学试验孔隙水压力测试结果对照 ,说明黄河三角洲水下斜坡某些土体的破坏 ,未出现波浪循环荷载作用下孔隙水压力积累升高所导致的土体液化破坏 。

A flume test was conducted with remolded soil sam pl es obtained from the Yellow River Subaqueous Delta. A dynamic triaxial test on u ndisturbed samples was also conducted. The test records indicated that the value of pore water pressure changed abruptly when the soil failed. Contrasting the e xperimental results in this paper with the results of pore water pressure from i n situ dynamic sediment test, it was found that the soil failed on the Yellow R iver Subaqueous Delta not because the value of pore water pressure piled up unde r cyclic wave loading, leading to soil liquefaction, but beause the action of st rong shearing stress on the seabed by storm wave loading.