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通过一系列室内试验,研究了黄河口粉质类沉积物在循环动荷载作用后侵蚀性的变化。在试验中,采用真空预压固结装置制备重塑土样,采用液压伺服土动三轴试验机实现了不同幅值及不同振次的动荷载作用条件,并通过动三轴静态试验及贯入强度测试,测定了动荷载作用后土样强度的变化。通过水槽冲刷试验测试了不同条件的动荷载作用后,土样抗冲刷能力的变化,并进行了临界剪切应力的计算。试验结果表明:对于黄河口粉质类沉积物,动荷载作用后其强度及抗侵蚀性均降低;沉积物强度指标(不排水剪切强度、残余强度、贯入阻力)、侵蚀性指标(起动流速、临界剪切应力、冲刷率)与动荷载幅值、动荷载振次均呈现出较好的线性相关性。
Through a series of laboratory experiments, the erosivity of silty sediments in the Yellow River Estuary after cyclic loading was studied. In the experiment, the remolded soil samples were prepared by the vacuum pre-consolidation device, and the dynamic loading conditions of different amplitudes and different vibration times were achieved by the hydraulic servo soil moving triaxial testing machine. Into the strength test, measured after the dynamic load of soil strength changes. The change of anti-scouring ability of soil sample after dynamic loading under different conditions was tested by the sinking test. The critical shear stress was calculated. The results show that for the silty sediments in the Yellow River Estuary, the strength and corrosion resistance of silty sediments in the Yellow River Estuary are reduced after dynamic loading. The sediment strength indexes (undrained shear strength, residual strength, penetration resistance), erosion index Flow rate, critical shear stress and erosion rate) showed a good linear correlation with dynamic load amplitude and dynamic load vibration frequency.