滇西芒市盆地芒棒组软岩的水文、工程地质
特征及其对工程的影响
——以芒究煤矿为例 |
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引用本文: | 吕 勇,王 宇,甘伏平,蒋忠诚,杜毓超,杨启军,王 珽,范鲁舟,杨 泰.滇西芒市盆地芒棒组软岩的水文、工程地质
特征及其对工程的影响
——以芒究煤矿为例[J].地质通报,2012,31(203):382-388. |
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作者姓名: | 吕 勇 王 宇 甘伏平 蒋忠诚 杜毓超 杨启军 王 珽 范鲁舟 杨 泰 |
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作者单位: | 1. 中国地质科学院岩溶地质研究所,广西 桂林 541004; 2. 桂林理工大学,广西 桂林 541004;
3. 云南省地质环境监测院,云南 昆明 650051; 4. 云南省199煤田地质队,云南 楚雄 650000 |
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摘 要: | 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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关 键 词: | 滇西 陆相盆地 煤岩 测井曲线 软弱岩组 降落漏斗 |
Hydrogeological and engineering geological characteristics of Mangbang Formation soft rocks in Mangshi basin, western Yunnan Province: a case study of the Mangjiu coal mine |
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Institution: | 1. Institute of Karst Geology, CAGS,Guilin 541004,Guangxi,China;
2. Guilin University of Technology,Guilin 541004,Guangxi,China;
3. Yunnan Institute of Geological Environmental Survey, Kunming 650051,Yunnan,China;
4. Yunnan 199 Coal Field Geological Team,Chuxiong 650000, Yunnan,China |
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Abstract: | The Mangshi basin is a continental sedimentary basins formed on the tectonic background of episode II of Himalaya Movement, with the primary filling substance being the river-lacustrine sedimentary system of Mangbang Formation. According to mining and drilling data, the engineering geological consolidation classification of Mangbang Formation is semi-soft rock, which can be divided into sandstone-sandy conglomerate soft rock group, siltstone weak rock group and carbonaceous mudstone-coal weak rock group. The coal seam is of low ash (15%-25%), low sulfur (0.5%-2.5%), semi-dark-half light brown type, and there exists a certain degree of self-ignition, The strength of the rock groups are in order of Psand-gravel
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Keywords: | western Yunnan Province continental basin coal rock logging curve weak rock group depression funnel |
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