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本文通过模型试验揭示了有关沟后面板砂砾石坝溃坝的原因．单纯是面板顶端接缝漏水只出现垂直向下的渗流，上部下游坝坡没有逸出水流．接缝漏水同时面板顶端与坝体之间大范围的相脱开，才会再现上部下游坝坡逸出渗流．溃坝前坝体中部并未全饱和．溃坝机理是坝顶存在ｋ＞１０ｃｍ／ｓ且呈上下游连通的极强透水层，面板顶端又是脱开坝体的，接缝漏水使极强透水层与库水直接相连通，因而产生较大的水平向的水力比降，使之管涌和接触冲刷，同时渗流冲刷坝坡，引起崩塌．最后防浪墙失稳倒塌，库水漫顶而下，最终溃决．
In this paper, the model test is used to reveal the reasons for the dam dams on the dams behind the ditch. Purely, the joint leakage at the top of the panel shows only the seepage flow vertically downwards, and the upper downstream slope does not escape the water flow. Joint leakage at the same time the top of the panel and the dam phase of a wide range of phase-out, will reproduce the upper downstream slope to escape seepage. The dam body before dam failure is not fully saturated. The mechanism of dam failure is that there is a very strong water permeable layer with k> 10cm / s at the crest of the crest, which is communicated with the upper and lower reaches. The top of the panel is detached from the dam body again. The joint leaking makes the extremely strong aquitard directly communicate with the reservoir water, As a result, a large horizontal hydraulic gradient is produced, causing the pipe surge and contact scour, meanwhile the seepage scour dam slope and cause collapse. Finally, the collapse of the anti-wave wall collapsed, flood water and eventually collapse.