EXPERIMENTAL AND FIELD STUDY ON MINING-PIT MIGRATION   总被引：5，自引：0，他引：5  

S.Ali Akbar Salehi NEYSHABOURI  Ali FARHADZADEH  Ata AMINI 《国际泥沙研究》2002,17(4)

1 INTRODUCTION Because of the large quantity of sand and gravel in their beds, rivers have always been considered as a major source of sand and gravel for civil works. Acceptable quality, ease of extraction and economy are some of the reasons could be mentioned. Unfortunately, specific laws and regulations regarding the safe in-stream mining have not been provided for users and officials. What should be taken into account are the effects of over-mining of sand and gravel, which can cause …  相似文献   

多矿物岩石流变规律的研究进展及存在问题   总被引：4，自引：2，他引：4  

江燕  臧绍先 《地球物理学进展》2002,17(3):456-463

总结了近年来由多种矿物组成的岩石的流变规律的研究，阐述了多矿物岩石流变性质研究的意义和进展，再从实验和理论两个方面，详细论述了目前最具代表性的三种理论模型，算术平均方法、几何平均方法和能量极小方法，最后，指出这方面研究仍然存在的问题和进一步研究的方向。  相似文献   

The environmental impact of small-scale gold mining in Ghana: identifying problems and possible solutions   总被引：2，自引：0，他引：2  

Gavin Hilson 《The Geographical journal》2002,168(1):57-72

This paper examines the environmental impacts of small-scale gold mining in Ghana, and prescribes a series of recommendations for improving environmental performance in the industry. Since the enactment of the Small Scale Gold Mining Law in 1989, which effectively legalized small-scale gold mining in the country, industrial operations, collectively, have made important contributions to national gold output, foreign exchange earnings and employment. Accompanying this pattern of socio-economic growth, however, have been increased environmental complications – namely, mercury pollution and land degradation. The Ghanaian Minerals Commission has been burdened with most of the jurisdictional responsibilities related to small-scale mining, but with a staff of only 35–40 people working with a pool of highly obsolete research resources, it is clearly incapable of facilitating sufficient environmental improvement on its own. It is concluded that marked environmental improvements can only be achieved if: (1) assistance is provided to the Minerals Commission from local governmental bodies and academic units; (2) industry-specific environmental management tools and strategies are designed and implemented; (3) concerted effort is made to prospect for deposits suitable for small-scale gold mining, a key to preventing unnecessary exploration; and (4) a nation-wide industrial mercury study is commissioned, and a mercury retorting programme is implemented.  相似文献   

Seismic moment distribution revisited: II. Moment conservation principle   总被引：3，自引：0，他引：3  

Yan Y. Kagan 《Geophysical Journal International》2002,149(3):731-754

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北京西部山地景观生态整治与景观规划--以北京房山区史家营乡的典型研究为例   总被引：6，自引：2，他引：6  

王云才  郭焕成 《山地学报》2003,21(3):265-271

北京市西部山区是因矿区开发使山地景观生态环境破坏的重点地区,在北京市生态环境整治与建设中具有十分重要的典型意义。不合理的煤炭资源开采导致了矿点密度大,采空塌陷区分布广,水资源急剧减少,水质污染严重,植被大规模遭破坏,水土流失严重,泥石流等灾害加重以及煤尘污染问题突出等一系列环境问题,呈现出山地生态系统遭受严重破坏的景观生态特征。本文以史家营为例,在典型调查的基础上,规划了景观生态环境恢复与重建区、种植养殖和观光生态农业示范区、果粮养殖生态农业区、林草放牧生态畜牧业示范区、生态旅游区的五个景观规划区域,探讨了生态型矿业、中低山特色生态农业和生态旅游发展的产业发展模式,并初步提出了景观生态整治的措施。  相似文献   

Statistic forecast of typhoons going over the Chinese coasts     

FENG Lihua  WU Zhanghua 《地理学报》2003,13(3):305-308

According to the measured data of typhoons going over the Chinese coasts in 1949-2002, a statistic relative equation showing the relation between the central atmospheric pressure of typhoons in a certain region at a certain period of time and their accumulation of frequency is established, and the concept of recurrence interval of typhoons is put forward, which is of actual significance for typhoon disaster reduction along the coastal area.  相似文献   

陕西省神木县地质灾害发育特征及防治建议   总被引：1，自引：0，他引：1  

伍跃中  陈守建 《中国地质灾害与防治学报》2003,14(3):81-85,90

陕西省神木县近年来经济发展迅猛，但随着境内煤炭资源的开发利用和各类基础设施建设的加快发展，崩塌、滑坡、泥石流、矿区塌陷等地质灾害也愈发严重，对人民生命财产造成了巨大危害。笔者等在遥感图像解译和野外详细调查访问的基础上，查明了区内地质灾害类型、数量、规模及其时空展布规律，分析了各类地质灾害的主要形成条件。指出各类灾害中以煤矿开采及煤田自燃引起的矿区地面塌陷分布范围最广、危害最严重，其次是崩塌、滑坡，泥石流灾害仅局部发育。描述了重要灾点特征，提出了相应的防治建议。  相似文献   

沁南地区煤层气生产潜力研究   总被引：3，自引：0，他引：3  

吴建光 《中国煤田地质》2003,15(1):27-28,70

本文以沁水盆地南部地区煤层气生产试验井的徘采资料为基础，结合煤田地质勘探和中联公司煤层气勘探所获得的地质、生产资料，阐述了煤层气井的排采机理。并以TL—003井排采试验为例进行详细剖析，运用储层模拟技术，研究、分析影响煤层气产出的主要参数，初步预测了该区煤层气井的生产潜力。  相似文献   

双鸭山矿区矿井充水规律研究   总被引：2，自引：0，他引：2  

闰孝林  孟凡军 《中国煤田地质》2003,15(2):31-34

根据双鸭山矿区的水文地质条件及多年生产实践资料(矿井涌水量与其相关因素——地貌、采掘深度、回采面积、巷道长度、岩性、构造、降雨的关系),阐述了矿区充水的一般规律,提出了含水砂层覆盖下采区进行水文地质勘探的重点及开采含水砂层覆盖下煤炭资源的主要防治水措施,对同类水文地质条件矿井开采煤炭资源具有可借鉴意义。  相似文献   

兖州矿区山西组 3煤层中微量元素的特征分析   总被引：7，自引：2，他引：7  

刘桂建  杨萍玥  彭子成  王桂梁 《地球化学》2003,32(3):255-262

通过对兖州矿区山西组3煤层21个样品中全硫、硫化物硫、有机硫和具有环境意义的微量元素Cu、Pb、Zn、As、U、Th含量的测试，分析了微量元素在研究区煤层垂直方向上的变化特征及主要形成原因，并发现煤层中所选的微量元素、硫化物琉及全硫在煤层顶、底或煤层夹矸样品中含量相对较高。微量元素与硫化物硫、全硫的相关系数表明，所研究的微量元素与硫化物硫和全硫有明显的正相关关系，而且研究区3煤层中全硫的含量取决于硫化物硫的含量。同时还研究了原煤中微量元素的含量与灰产率的关系，并将研究区微量元素同世界和中国同类煤中的微量元素的含量进行了比较。  相似文献