Thus, the piping-induced failure of two-layer foundation was verified as that： mass flow firstly appears in the upper weakly permeable layer, and then underground erosion and scouring gradually occur from downstream to upstream between the serviously and
Thus, the piping-induced failure of two-layer foundation was verified as that： mass flow firstly appears in the upper weakly permeable layer, and then underground erosion and scouring gradually occur from downstream to upstream between the serviously and
从而验证了二元结构堤基的渗透破坏模式为：首先在上层弱透水层中发生流土，然后在强、弱透水层之间发生自下游向上游的逐步潜蚀冲刷。