中文摘要：

“8．8”舟曲特大山洪泥石流灾难惨重，引起国内外工程地质界的广泛关注。调查发现，以往的防治工程在这次特大泥石流中彻底被摧毁，防护能力完全失效，对此应深刻反思，吸取教训。在现场调查的基础上，通过离散元数值模拟和理论分析计算，得出浆砌块石拦挡坝抗泥石流冲压强度不足，泥石流流量与排导工程断面不匹配，排导沟行洪能力严重不足和弯道过多曲率较大等结论。这些问题的思考与认识可作为灾后治理工程方案论证的借鉴。

英文摘要：

The extra large debris flow in Zhouqu county on August 8, 2010 caused serious disaster which causing widespread concern of domestic and international engineering geological community. The investigation after disaster found that the former prevention and control projects were completely destroyed and the protection ability was breakdown. We should rethink it in order to learn this painful lesson. Based on the field investigation, through the discrete element simulation and theoretical analysis, the paper obtains some conclusions, such as the block dams are not strong enough against the stamping force of debris flow, the flow of the drainage projects does not match the cross-section, the flood discharge capacity is serious insufficient, there are too much curved conduits and the curvature is too big. Consideration and awareness of these issues will provide reference for the treatment scheme after the disaster.