桩基工程施工安全技术措施的实施     

刘长生 《中国煤田地质》2007,19(A01):98-100

桩基工程的投标文件及施工组织设计均要编制安全技术措施，根据钻探施工中有关安全规程，对每一个工程项目，都要建全安全生产责任制，加强上岗人员安全教育，保证在每一道工序开工前，都有详细的施工安全方案和保障措施，并在施工中全面落实，另外施工过程中对安全内容要按规定实行逐级交底。  相似文献   

两系杂交稻制种生产的气候生态诊断技术   总被引：3，自引：0，他引：3       下载免费PDF全文

汪扩军  刘家清等 《应用气象学报》2003,14(1):93-100

两系杂交稻制种生产对气候生态条件有严格要求,确定制种生产基地时应当先对当地的气候生态适宜性进行科学地诊断与评估。该文系统地分析了气候生态条件对两系杂交稻制种生产的特定影响,提出了制种生产上应注重的两段气候生态安全期概念,研究了两段安全期的诊断评估方法,研制出了两系杂交稻种子生产时空择优气候服务系统,并据此确定了湖南全省两系杂交稻种子生产的适宜区域与时段。2000年初,湖南省有关部门采纳了此项建议,进一步规范了全省的两系制种生产管理。  相似文献   

中国煤层气勘探开发技术研究进展   总被引：10，自引：0，他引：10  

冯三利  叶建平 《中国煤田地质》2003,15(6):19-23,29

我国煤层气勘探开发工作走过了十多年的探索历程,大致可以分为三个阶段：技术引进阶段、勘探评价阶段、开发试验及探索研究阶段。目前,制约煤层气商业开发的瓶颈技术问题在于寻找煤层气富集高渗区、提高煤层气产能的开发工艺技术。本文将着重介绍我国在煤层气勘探开发技术方面的研究进展,主要包括煤层气资源评价和区块优选评价技术、钻井技术、完井工艺技术、压裂工艺技术、注CO2增产技术、煤层气地球物理探测技术、煤层气井抽放技术、煤层气生产和评价技术等等。同时,提出了今后我国煤层气勘探开发技术存在的问题和发展趋势。  相似文献   

三维数字建模技术在某铜矿山中的应用   总被引：8，自引：0，他引：8  

戴碧波  王李管  贾明涛  刘红兵  荆永滨  曾庆田 《地质与勘探》2007,43(3):97-101

矿山三维数字建模与可视化技术研究,是"数字矿山"的核心组成部分,是现代矿山信息化研究的热点和重点.文章在对地质统计学和现代矿山数字建模技术研究基础上,结合国内某大型矿山,论述了矿床三维数字建模的过程和方法.结果表明,利用三维数字建模的方法来进行储量计算、品位估值、安排生产计划,将改变矿山传统的开采模式,是我国矿山现代化征程中的必由之路.  相似文献   

闽东食用菌生产的气温条件分析与利用     

余会康  林莉珍  郭默晗  刘琴 《气象科技》2008,36(4):453-457

根据闽东地区1976～2005年9个县市(区)的历史气温统计资料,分析气温变化特征,进行气温类型划分.结合实际不同温型食用菌类生长过程对温度条件的要求,确定全区9个县市(区)的各温型菌类适宜生长的界温和界温日期(初终日),统计出各温型菌类自然可生产期.分析不同气温类型地区在生产各温型菌类的优劣势,进而对生产各温型菌类生产季节进行安排,达到充分利用闽东气温条件为科学安排食用菌生产,节省生产成本,增加农民收入的目的.  相似文献   

Environmentalism and Natural Aggregate Mining     

Drew  Lawrence J.  Langer  William H.  Sachs  Janet S. 《Natural Resources Research》2002,11(1):19-28

Sustaining a developed economy and expanding a developing one require the use of large volumes of natural aggregate. Almost all human activity (commercial, recreational, or leisure) is transacted in or on facilities constructed from natural aggregate. In our urban and suburban worlds, we are almost totally dependent on supplies of water collected behind dams and transported through aqueducts made from concrete. Natural aggregate is essential to the facilities that produce energy—hydroelectric dams and coal-fired powerplants. Ironically, the utility created for mankind by the use of natural aggregate is rarely compared favorably with the environmental impacts of mining it. Instead, the empty quarries and pits are seen as large negative environmental consequences. At the root of this disassociation is the philosophy of environmentalism, which flavors our perceptions of the excavation, processing, and distribution of natural aggregate. The two end-member ideas in this philosophy are ecocentrism and anthropocentrism. Ecocentrism takes the position that the natural world is a organism whose arteries are the rivers—their flow must not be altered. The soil is another vital organ and must not be covered with concrete and asphalt. The motto of the ecocentrist is man must live more lightly on the land. The anthropocentrist wants clean water and air and an uncluttered landscape for human use. Mining is allowed and even encouraged, but dust and noise from quarry and pit operations must be minimized. The large volume of truck traffic is viewed as a real menace to human life and should be regulated and isolated. The environmental problems that the producers of natural aggregate (crushed stone and sand and gravel) face today are mostly difficult social and political concerns associated with the large holes dug in the ground and the large volume of heavy truck traffic associated with quarry and pit operations. These concerns have increased in recent years as society's demand for living space has encroached on the sites of production; in other words, the act of production has engendered condemnation. Many other environmental problems that are associated with dust and noise and blasting from quarry and pit operations have been reduced through the efficient use of technology. Recycling concrete in buildings, bridges, and roads and asphaltic pavements will ultimately reduce the demand for virgin natural aggregate. The impact created by the large holes in the ground required for the mining of natural aggregate can be greatly reduced by planning their reclamation before mining begins.  相似文献   

作物水分与氮素生产函数的实验研究   总被引：7，自引：0，他引：7       下载免费PDF全文

王康  沈荣开  沈言俐  许翠平  覃奇志 《水科学进展》2002,13(3):308-312

在田间水肥耦合试验的基础上,对水分生产函数的概念加以拓宽,提出了水分、氮素生产函数的概念,并建立了最终产量模型和动态产量模型,进行了参数求解,模型模拟结果和田间试验结果符合较好.  相似文献   

西昌市社会经济活动与生态建设的关联分析     

方一平 《山地学报》2004,(Z1)

利用灰色关联分析方法,从经济生产、社会生产和生态生产角度出发对西昌市社会经济活动与生态环境之间的关系进行了量化研究。研究表明:农业产业的活动是影响水土流失的主要因素,换句话说,调控农业产业经济活动是生态环境维护的有效途径。生态生产、经济生产和社会生产之间存在明显的作用关系,这种作用关系不外乎表现在正作用和负作用两个方面,生态与经济的协调很大程度上依赖于对以上三类要素的合理调节。事实上, 就是利用以上三类生产要素的可塑性,通过产业经济活动的调控,弱化或消除产业与生态的矛盾,积极发展生态产业,这对西昌如此,对其他地区仍具有普遍意义。  相似文献   

Availability of Bauxite Reserves     

Meyer  F. M. 《Natural Resources Research》2004,13(3):161-172

Based upon a large database, this paper analyzes the record of bauxite mine production, exploration success, and resource depletion and evaluates the availability of bauxite reserves in the near future. The record clearly shows that for the past 50 years world bauxite production rose by an annual increase of over 5% while per capita consumption rose during the same period by about 4%. Time trends of the world bauxite reserve life index (RLI); that is, known world reserves of a given year divided by world production of the same year, are episodic and seem to follow bauxite price cycles. The present-day RLI indicates adequate bauxite supply for about 180 years and is the same as it was in 1950. However, if an annual growth rate of 5% is considered, the currently known reserves will be exhausted within the next 20 years and the reserve base will be adequate for not more than 25 years. This scenario is based, of course, on the unrealistic assumption that future exploration efforts fail to discover additional reserves. Evaluation of the quality, in terms of bauxite signatures, and quantity of presently known bauxite prospects that may be mined in future suggests that there is sufficient potential for adequate bauxite supply for the next 20 to 25 years at least. Bauxite signatures cover a wide range of values that allows selection of the most favorable bauxite prospects for future mining, both in economic as well as environmental terms. Although, there is the general believe that the world abundance of bauxite resources will ensure sufficient supply to meet future demands significant additional reserves have to be discovered if exponential growth rates continue. As the question of future bauxite supply is subject to economic and geologic principles one has to take into consideration that increasing exploration maturity in many mineral provinces will make it difficult to locate additional bauxite reserves and that decreasing real commodity prices will influence the level of investment in bauxite exploration.  相似文献   

A simple accelerated rock weathering method to predict acid generation kinetics     

David M. Kargbo  Jiren He 《Environmental Geology》2004,46(6-7):775-783

The development of effective, and economical pre-development waste rock management plans requires an accurate estimate of the quality of drainage generated during mining. This study was conducted to determine if a simple accelerated rock weathering method with lower capital and personnel costs can be used in lieu of the elaborate and costly ASTM method to predict the quality of drainage generated. It involves subjecting rock samples to a constant relative humidity and temperature for 7 days and leach flooding the weathered samples on the 7th day. The acid production rate from the new weathering method correlates quite well with the net neutralization potential generated from the standard acid-base accounting procedure (R²=0.940) which has been demonstrated to be correct 90% of the time in assessing overburden quality, and a mineralogical method (R²=0.924). For investigators interested in generating weathering kinetic parameters, the simple and less costly accelerated weathering method is proposed.  相似文献