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2013-07-17T20:00—2013-07-18T3:00,冕宁县牦牛坪稀土矿区7 h降雨219 mm,瓦维埃河及支沟发生6处水石流,对采矿场、选矿厂、地面站、弃土场、排洪沟、矿山公路及矿山环境造成严重危害。研究发现:牦牛坪矿区具备水石流发育的充分条件,泥石流沟处于发育壮年期,但泥石流处于衰退期。“7·18”水石流是在100 a一遇强暴雨激发下,沟床及岸坡老泥石流堆积物和沟床堆积物在山洪冲蚀下切、侧蚀下形成的,暴雨和水石流暴发频率同步。其水石流具有固体物质粗大(最大粒径8 m),块砾石含量高(80%以上),粉、粘粒含量极低(小于1%),容重高(1.6~1.85 t/m3),冲淤变化大(最大冲深10 m,最大淤积5 m),规模大(总冲出量50×104m3)等特点。
2013-07-17T20: 00-2013-07-18T3: 00, Mianning County, Maoniuping rare earth mining 7-h rainfall 219 mm, Wavier River and branch ditch 6 water stone flow, the mining field, concentrator, ground station , Spoil grounds, flood discharge ditches, mine roads and mine environment. It is found that the sufficient conditions for the development of water stone flow are available in the Maoniuping mining area, and the debris flow ditch is in its mature growth stage, but the debris flow is in a declining period. Under the intense rainstorm of 100 a, the debris flow and the sediment of the ditches of the ditches and banks were cut under the erosion of the mountain torrents and formed under the side erosion. The heavy rain and the water flow Outbreak frequency synchronization. The water stone flow has the characteristics of coarse solid material (maximum particle size of 8 m), high content of block gravel (over 80%), very low content of powder and clay particles (less than 1%), high bulk density (1.6-1.85 t / m3) Large changes in siltation (maximum reddish depth of 10 m, the maximum deposition of 5 m), large-scale (total out of 50 × 104m3) and so on.