普朗铜矿地表冰碛物径流分选试验研究

Experimental Study on Surface Moraine Runoff Separation in Pulang Copper Mine

降雨是地表冰碛层地区产生径流分选的主要动力因素。采用室内人工模拟降雨试验方法,以香格里拉普朗铜矿地表冰碛物颗粒为研究对象,开展径流坡度32°条件下的不同降雨强度时冰碛物径流分选规律研究。结果表明:冰碛物颗粒在不同降雨强度径流冲刷作用下具有显著的分选效果,且冰碛物径流冲刷颗粒粒径随降雨强度的增强而提高;随着降雨强度的增强,冰碛层坡面冲刷沟发育数量不断增加,冲刷沟面积和沟深也相应增大,坡面径流冲刷侵蚀程度越严重,但径流分选对颗粒粒径的选择性减弱。研究成果可为冰碛物颗粒径流分选的防治制定有效措施,避免径流分选后的细粒冰碛物颗粒进入开采活动范围内,对矿山井下泥石流灾害事故的防控具有重要意义。

Rainfall is the main driving factor for runoff sorting in surface moraine areas.Taking the surface moraine particles of Shangri-La Pulang Copper Mine as the research object,the indoor artificial sim⁃ulated rainfall test method was used to study the separation law of moraine runoff under different rainfall in⁃tensities under the condition of runoff slope of 32°.The results show that the moraine particles have signifi⁃cant sorting effect under different rainfall intensity runoff scouring,and the particle size of moraine runoff scouring increases with the increase of rainfall intensity.With the increase of rainfall intensity,the number of erosion gullies on moraine slope increases,and the area and depth of erosion gullies also increase accord⁃ingly.The more serious the erosion of slope runoff,the weaker the selectivity of runoff sorting to particle size.The research results can formulate effective measures for the prevention and control of the runoff separa⁃tion of moraine particles,and avoid the finegrained moraine particles after runoff separation into the scope of mining activities,which is of great significance for the prevention and control of underground debris flow di⁃sasters in mines.