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在黄河口海床若干深度处埋设孔压探头,海床表面利用活塞施加水压循环荷载以模拟波浪荷载,观测土体内孔隙水压力变化过程,研究黄河口原状和重塑粉质土在波浪循环荷载作用下的液化特征。通过研究发现,原状土和重塑土的孔压激发曲线模式不同,原状土孔压经历四个阶段,即先上升、后下降、再上升和剧烈波动;而重塑土孔压只有上升和剧烈波动两个阶段,这两种模式与循环荷载作用下粉土的微结构变化有关。分析波浪荷载的特点,将孔压出现剧烈波动的时刻作为完全液化的标志。土体液化与固结程度有关,固结程度越大,越不易液化。实际波浪荷载作用下,土体液化时间比文中试验测得的要短。
In the depth of the Yellow Sea estuary at a number of depth buried buried pressure probe, the surface of the sea surface using the piston to exert hydraulic cyclic loading to simulate the wave load to observe the pore water pressure changes in the process of the Yellow River estuary undisturbed and remolded silt in the wave cycle Liquefaction characteristics under load. According to the research, it is found that the mode of pore pressure excitation curve of undisturbed soil and remolded soil is different. The pore pressure of undisturbed soil goes through four stages, that is, it first increases, then decreases, then rises and then fluctuates violently; Two stages of fluctuation, these two modes are related to the microstructure change of silt under cyclic loading. Analysis of the characteristics of wave load, the pore pressure fluctuations appear as a sign of complete liquefaction. Soil liquefaction and the degree of consolidation, the greater the degree of consolidation, the more difficult to liquefaction. Under actual wave loading, soil liquefaction time is shorter than that measured in the paper.