Concentrations of metals are lower in coal shales collected from recently exposed surface mine wastes than in shales collected from spoils exposed to surface weathering for 45 a. In this period, the character of the s...Concentrations of metals are lower in coal shales collected from recently exposed surface mine wastes than in shales collected from spoils exposed to surface weathering for 45 a. In this period, the character of the spoils changes dramatically as a result of the accelerated breakdown of the freshly exposed minestones. Since the metals are held as unstable sulfides, it is suggested that enrichment may be caused by absorption of metals by colloid of iron or formation of organic complex compound with organic carbon existing in the remnant structure of coal mine spoil. This process may contribute to the triggering of soil contamination thresholds on coal-lands already heavily loaded with metals.展开更多
The South Wales Coalfield has been affected by more than 200 years of industrialdevelopment based on coal mine. Today, surface coal mine affects a 100-km belt in theHeads of the Valley region. Large areas of land are ...The South Wales Coalfield has been affected by more than 200 years of industrialdevelopment based on coal mine. Today, surface coal mine affects a 100-km belt in theHeads of the Valley region. Large areas of land are classified as 'reclaimed' land after coal mining. However, there is increasing concem about both the quality and the sustainability of this reclaimed land. Large tracts of 'reclaimed' land are suffering severe degradation runoff, erosion gullies, waterlogging through most of the year, drought during the short summer period of soil moisture deficit, and the consequent loss of vegetation cover.展开更多
为了弥补BIM建模软件Autodesk Civil 3D在水土保持工程设计中的局限性,解决传统弃渣场设计工作无专业辅助设计软件、信息化水平低、二三维设计转换困难等问题,利用C#语言、Winform界面开发、Civil 3D API及部件编辑器、MVC架构模式对Civ...为了弥补BIM建模软件Autodesk Civil 3D在水土保持工程设计中的局限性,解决传统弃渣场设计工作无专业辅助设计软件、信息化水平低、二三维设计转换困难等问题,利用C#语言、Winform界面开发、Civil 3D API及部件编辑器、MVC架构模式对Civil 3D平台进行二次开发。通过分析弃渣场各设计步骤的业务流程,研发了适用于水土保持工程弃渣场设计的专业平台,实现了容渣量分析、稳定性计算、以数据驱动为核心的快速建模与出图算量等功能,并应用于引洮供水二期(骨干)工程多个弃渣场的施工图设计中。结果表明:该平台将工程设计规范与带有步骤引导的可视化操作界面相关联,在弥补弃渣场设计无专业辅助软件的同时,极大地提高了设计效率和设计质量,有效地推动了弃渣场设计从二维向三维转换。展开更多
文摘Concentrations of metals are lower in coal shales collected from recently exposed surface mine wastes than in shales collected from spoils exposed to surface weathering for 45 a. In this period, the character of the spoils changes dramatically as a result of the accelerated breakdown of the freshly exposed minestones. Since the metals are held as unstable sulfides, it is suggested that enrichment may be caused by absorption of metals by colloid of iron or formation of organic complex compound with organic carbon existing in the remnant structure of coal mine spoil. This process may contribute to the triggering of soil contamination thresholds on coal-lands already heavily loaded with metals.
基金Project supported partly by Redaiming the Land Project of Earthwatch.
文摘The South Wales Coalfield has been affected by more than 200 years of industrialdevelopment based on coal mine. Today, surface coal mine affects a 100-km belt in theHeads of the Valley region. Large areas of land are classified as 'reclaimed' land after coal mining. However, there is increasing concem about both the quality and the sustainability of this reclaimed land. Large tracts of 'reclaimed' land are suffering severe degradation runoff, erosion gullies, waterlogging through most of the year, drought during the short summer period of soil moisture deficit, and the consequent loss of vegetation cover.
