四川汉源万工集镇“7.27”灾后泥石流预测分析与综合防治

Debris flow prediction and comprehensive treatment of "7.27" post-disaster of Wangong town,Hanyuan county,Sichuan province

2010年7月27日,四川省汉源县万工集镇后缘大沟顶部二蛮山突发滑坡-碎屑流地质灾害,对下部万工集镇以及山坡原住民造成了重大损失。本文介绍了"7.27"灾后的泥石流调查及综合防治,通过专门的野外泥石流地质调查,根据宏观判断和定量计算,得出了灾害发生后,大沟流域沿沟堆积的"7.27"松散物质可能再次引发大规模泥石流以及二蛮山古堆积体失稳可能形成碎屑流从而对万工集镇产生危害;并有针对性地简要介绍了灾后综合防治方案。万工"7.27"地质灾害结合滑坡-泥石流(碎屑流),具有综合性强,危害大的特点,值得深入研究。

July 27th 2010, a sudden geological disaster in form of landslide-debris flow occurred at the ridge of Erman Mountain, Dagou gully, caused significant damage to the hillside residents and Wangong town. This paper introduced the debris flow investigation and the corresponding treatment of ＂7. 27＂ post-disaster based on macroscopic evaluation and quantitative calculation which indicate that after ＂7.27＂ geologic disaster, the cumulated ＂7.27＂ soft deposits along the Dagou valley could again cause large-scale debris flow under specific circumstances, and the possible unstability of the ancient-deposit located on the ridge of the Erman Mountain could form clastic flow to endanger Wangong town.