coal seam has intermediate apparent resistivity, and the radioactive anomaly curve is obviously different from that of other rocks. The pumping test results show that the permeability coefficient k is in the range of 0.1-0.01, and the radius of the cone of depression is between 77 and 119 m. Although the distance from the Mangshi River to the drilling position is rather short, there is no obvious hydraulic connection, and the poor permeability rock possesses the major part. Mining exploration in the past 50 years has formed a number of mined-out areas and abandoned mined-out areas. Because these gobs are far away from the railway, the mined areas will not pose a threat to railway construction.%滇西芒市盆地是在喜马拉雅构造运动第Ⅱ幕基础上形成的陆相沉积盆地,该盆地中的上新世芒棒组为河湖相沉积体系.根据矿区钻孔资料,芒棒组在工程地质岩组划分上属半固结软岩,可分为砂岩-砂砾岩软弱岩组、粉砂岩软弱岩组和炭质泥岩-煤层软弱岩组3类,各岩组强度依次为P砂-砾＜P粉砂＜P泥-炭.煤层为低-中灰分(15％～25％)、低硫-中硫(0.5％～2.5％)的半暗淡-半亮褐煤,有一定的自燃性.测井数据和曲线显示,煤层视电阻率中等,放射性异常曲线明显与其它围岩不同；抽水试验结果表明,渗透系数k在0.1～0.01m/d之间,降落漏斗影响半径77～119m,煤矿虽然距离芒市河很近,但却无明显的水力联系,证实芒棒组整体透水性较差.矿山勘探、开采持续时间近50年,已形成了一些采空区和废弃采空区,由于距铁路优选线较远(1.5～2km),不会对大理-瑞丽铁路建设产生明显的影响.
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