Through two lab-scale experiments, we investigated the hydraulic and mechanical characteristics of sediment layers during water film formation, induced by elevated pore pressure—considered one of the triggers of submarine landslides. These involved (1) sandbox experiments to prove the effect of water films on mass movement in low slope gradients and (2) experiments to observe the effect of the tensile strength of semi-consolidated sediment layers on water film formation. Portland cement was used to mimic the degree of sediment cementation. We observed a clear relationship between the amount of cement and pore pressure during water film formation; pressure evolution and sediment deformation demonstrated the hydraulic and mechanical characteristics. Based on the results of these experiments, conditions of the sediment layers during water film formation are discussed in terms of pore pressure, permeability, tensile strength, overburden pressure, and tectonic stresses. The results indicate that the tensile strength of the sediment interface provides critical information on the lower limit of the water film formation depth, which is related to the scale of potential submarine landslides.

通过两个实验室规模的实验，我们研究了由孔隙压力升高引起的水膜形成过程中沉积物层的水力和机械特性，这被认为是海底滑坡的诱因之一。其中包括（1）沙箱实验，以证明水膜对低坡度梯度下的质量运动的影响；（2）实验，观察半固结沉积物层的拉伸强度对水膜形成的影响。波特兰水泥被用来模拟沉积物的胶结程度。我们观察到水成膜过程中水泥用量与孔隙压力之间存在明显的关系。压力演化和沉积物变形表现出水力和机械特性。根据这些实验的结果，根据孔隙压力，渗透率，抗张强度，上覆压力和构造应力讨论了水膜形成过程中沉积物层的条件。结果表明，沉积物界面的抗拉强度提供了有关水膜形成深度下限的关键信息，这与潜在海底滑坡的规模有关。