水化学指标表示裘布依公式的应用   总被引：2，自引：0，他引：2  

侯玉新 《水文地质工程地质》2003,30(4):97-101

从多矿物溶解化学动力学方程出发,推演并建立了由水化学指标表示的承压二维井流裘布依公式。结合水文地质、水文地球化学特征,列举了水文地质单元内不同区带、各种代表性矿物及相应组分化学指标的基本表达式。以山西省太原西峪煤矿所需解决的水文地质问题为例进行了定量研究与评价,其结果与已有的抽水试验资料接近,为矿井涌水量的评价开辟了一条新的道路。从事实上进一步论证了水化学指标表示裘布依公式的理论概括是正确的。  相似文献   

矿山工程裂隙破碎带的三维地震模式识别原理及应用效果   总被引：1，自引：0，他引：1  

李文勇  路文芬 《水文地质工程地质》2003,30(6):40-43

本文从时间域、频率域、三维空间域介绍了矿山工程裂隙破碎带主要的地震运动学、动力学属性参数,包括相对振幅、波峰相位时间、相似系数、主频带能量、三维空间时间梯度和相干系数等,提出了矿山工程裂隙破碎带三维地震属性的去噪平滑、归一化、相关分析、特征变换的处理方法以及裂隙破碎带的模式识别原理与方法,并用实例说明了该方法的应用效果。结果表明:模式识别法对于解释矿山工程的裂隙破碎带是有效的,并具有广阔的应用前景。  相似文献   

露天铁矿禀赋优势等级划分和合理矿业税费的研究          下载免费PDF全文

刘保顺袁怀雨  李克庆 《地质与勘探》2003,39(4):69-72

利用自组织神经网络，对我国主要露天铁矿进行了禀赋优势等级划分。权利金大小的确定，应以铁矿资源的资产评估为基础，资产评估时合理成本的取值应是评估矿山所在同一等级矿山的平均成本。矿产资源的原有价值是权利金征收的对象。最后以歪头山为实例，计算了铁矿资源的原有价值和权利金。结果表明，目前对歪头山铁矿征收的税费仍然偏高。  相似文献   

用卫星高光谱数据提取江西德兴铜矿矿山废水的pH值污染指标     

刘圣伟  甘甫平  王润生 《地质通报》2003,(Z1)

在对德兴铜矿矿山废水的光谱特征深入分析研究的基础上,总结了不同类型水体(酸性水、碱性水以及河流水)的特征光谱,并利用地物谱特征开展矿山废水pH值污染指标提取研究。针对水体光谱反射率低、特征光谱不明显的特点,采用矿区卫星Hyperion高光谱数据,应用ISA算法和掩膜技术识别出水体分布并进一步与MNF变换有效结合,根据波段散点图进行不同pH值水体的有效分割。为矿山废水污染的诊断和监测提供了新技术和理论支撑。  相似文献   

Origin and Formational Environment of Noda-Tamagawa Manganese Ore, Northeast Japan: Constraints from Isotopic Studies     

Mohammed El Rhazi  Ken-ichiro Hayashi 《Chemie der Erde / Geochemistry》2003,63(2):149-162

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200 years of mining activities at La Paz/San Luis Potosí/Mexico - Consequences for environment and geochemical exploration     

Javier Castro-Larragoitia  Utz Kramar  Harald Puchelt 《Journal of Geochemical Exploration》1997,58(1):81-91

The Ag---Pb---Zn---Cu---Au mining district of Santa María de La Paz has been extensively exploited for approximately 200 years. Consequences of these activities are several deposits of tailings with high As and heavy metal concentrations, which are completely unstable. The climate is semiarid and as the dumps have no protective cover, material from the dumps is dispersed by strong winds. It is also washed out during seasonally heavy rainfalls. By these processes approximately 100 km² of surrounding have been contaminated by dump material. The As and heavy metal content of the soils was determined as well as their level in crops (Zea Maize) from agricultural lands in the vicinity of the dumps. In the direction of prevailing winds concentrations up to 1000 ppm Zn, 400 ppm Pb, 16 ppm Cd, 550 ppm Cu and 300 As have been detected in top soils. Using fuzzy cluster analysis the different contamination sources could be identified. Grains of corn from contaminated sites showed no critical concentrations, but leaves which are also used tor fodder, have As-concentrations up to 20 ppm.  相似文献   

柿竹园钨锡钼铋矿床合理的勘探方法及储量比例探讨     

王本淳 《湖南地质》1996,15(2):107-111

本文剖析了柿竹园钨锡钼铋矿床地勘阶段地质观察粗浅，勘探投入超前，探明储量积压、Ｂ＋Ｃ级储量比例偏大等不合理的勘查工作及其原因。在此基础上，探讨矿区合理的勘探程度，储量比例及由此带来的经济效益。  相似文献   

Estimation of in situ viscoelastic parameters of weak floor strata by plate-loading tests     

Gang Chen  Yoginder P. Chugh 《Geotechnical and Geological Engineering》1996,14(2):151-167

Summary This paper explores an approach to estimation of the viscoelastic parameters of weak floor strata using plate-loading tests. Mathematical equations are derived to describe deformation-time history for the standard Burgers model under three-dimensional stress-strain conditions, which are verified with a finite element model. A number of time-dependent in-mine plate-loading tests were conducted and the values of the viscoelastic parameters were estimated based on the derived equation. It is shown that large discrepancies between the parameter values estimated from the plate-loading tests and those acquired from the in-mine convergence data are the results of neglecting adjacent pillar interaction. Finite element modelling was conducted to investigate the effects of adjacent pillar interactions upon the pillar settlement. Based on the finite element analyses, a correction curve was developed to adjust the viscoelastic parameter values to take into account the interaction between adjacent pillars. With the correction, the parameter values estimated from the plate-loading tests compared favourably with those acquired from the in-mine convergence results.  相似文献   

Feasibility and cost of creating an iron-phosphate coating on pyrrhotite to prevent oxidation     

Z. J. Georgopoulou  K. Fytas  H. Soto  B. Evangelou 《Environmental Geology》1996,28(2):61-69

 Acid mine drainage (AMD) occurs when sulfide minerals are exposed to an oxidizing environment. Most of the methods for preventing AMD are either short-term or high cost solutions. Coating with iron phosphate is a new technology for the abatement of AMD. It involves treating the sulfide with a coating solution composed of H₂O₂, KH₂PO₄, and sodium acetate as a buffer agent. The H₂O₂ oxidizes the sulfide surface and produces Fe³⁺ so that iron phosphate precipitates as a coating on the sulfide surface. Experiments performed under laboratory conditions prove that an iron phosphate coating can be established on pyrrhotite surfaces with optimal concentrations of the coating solution in the range of: 0.2M/0.01M H₂O₂, 0.2M KH₂PO₄, and 0.2M sodium acetate NaAc, depending on the experimental scale. Iron phosphate coating may be a long-term solution to the problem of AMD. The method would be easy to implement; the reagent cost, however, is not low enough, although it is lower than the conventional treatment with lime. Received: 30 March 1995 · Accepted: 6 September 1995  相似文献   

Field assessment of acid mine drainage contamination in surface and ground water   总被引：4，自引：1，他引：4  

N. F. Gray 《Environmental Geology》1996,27(4):358-361

Both sulfate and conductivity are useful indicators of acid mine drainage (AMD) contamination. Unlike pH, they are both extremely sensitive to AMD even where large dilutions have occurred. The advantage of using sulfate to trace AMD is that unlike other ions it is not removed to any great extent by sorption or precipitation processes, being unaffected by fluctuations in pH. These two parameters are also closely associated as would be expected, as conductivity is especially sensitive to sulfate ions. Therefore, as sulfate analysis is difficult in the field, conductivity can be used to predict sulfate concentration in both AMD and contaminated surface waters using regression analysis. Most accurate predictions are achieved by using equations given for specific conductivity ranges or AMD sources. There is also potential to use conductivity to predict approximate concentrations of key metals when the pH of the water is within their respective solubility ranges.  相似文献