地应力测量在矿床突水防治中的应用——以河南夹沟铝土矿床突水防治工程为例   总被引：2，自引：0，他引：2  

李满洲  余强  郭启良  陈群策  安其美 《地球学报》2006,27(4):373-378

针对铝土矿床突水,开展地应力测量研究,是分析查明突水成因、优化确定防治方案及合理进行矿床底板管理的一项重要手段。夹沟矿床测量分析结果表明:①矿床地区存在较高的水平构造应力,其量值明显高于垂向应力。矿床水平高构造应力对矿床底板及其边坡稳定性具有不良影响,矿床开采掘面轴线走向应沿N70°E方向布设趋佳;②由于持续开采作用,矿床附近地应力状态产生不良扰动,水平高构造应力同开采形成的局部地应力场不良改变的叠加影响对矿床底板岩石场各类裂隙、结构面水起到极为重要的“催化”作用,是造成矿床底板突水的重要因素之一;③防治工作应重视加强矿床底板管理,科学预留安全隔水层屏障。并建议对矿床底板及其下伏一定范围内的灰岩实施预注浆处理,使得裂隙得以加固、溶洞得到堵塞,以抵抗不良应力的作用,消除或减弱对矿床突水的影响。  相似文献   

Sur les anomalies structurales de l'anticlinal de l'oued Bahloul de Tunisie : héritage tectonique et plissement cisaillant de couverture     

Ahmed Saadi  Noureddine Boukadi  Ali Gaaya 《Comptes Rendus Geoscience》2006,338(9):650-657

The Oued Bahloul structure exists in the central Atlas of Tunisia. This structure is oriented N70 and it shows a very particular geometry characterized by: (i) an important disharmony between the northern and the southern flanks; (ii) a dissymmetry between the east and the west parts of the structure; (iii) several gaps and progressive unconformities present in the Cretaceous and Eocene series.Three major tectonic directions characterize this structure: (i) the N120 appears in the western part of the anticline; (ii) some north–south faults distinguish the oriental part; (iii) the strike fault, which is confirmed by seismic data, affects the central part of this anticline. To cite this article: A. Saadi et al., C. R. Geoscience 338 (2006).  相似文献   

复合土钉墙支护技术在某大型软土基坑围护中的应用          下载免费PDF全文

杜常春  章泽军  李飞  周喜锋 《探矿工程》2006,33(2):26-29

根据拟建建筑基坑的工程地质条件、周边环境条件、基坑开挖深度等特点综合考虑，对基坑分段采用超前微型桩支护加土钉墙、放坡加土钉墙2种复合支护方案。实践证明，该工程所采用的多种复合式支护实施方案，技术安全可靠，经济合理。  相似文献   

2004–2005 Analytical Developments in Secondary Ion Mass Spectrometry     

Etienne Deloule 《Geostandards and Geoanalytical Research》2006,30(3):175-182

This review of the literature from 2004 and 2005 concerning secondary ion mass spectrometry (SIMS) highlights the contribution the technique has made in the fields of petrology, geochronology, cosmochemistry and material sciences. In petrology, much research was devoted to the measurement of stable isotopes and trace elements by developments in multicollection acquisition, with emphasis on low atomic mass number elements. Elements studied in particular were S (in sulfides), O (in garnets), C (in sedimentary organic matter), Cl (in glasses) and Si. Novel applications of SIMS to geochronology have included the measurement of young zircon grains by the U-Pb and U-Th decay methods. An increasing number of studies have combined U-Pb geochronology with the measurement of trace elements or stable isotopes in zircon.  相似文献   

长白山锦北雨养泥炭剖面元素富集规律分析   总被引：3，自引：2，他引：3  

贾琳  王国平  刘景双 《湿地科学》2006,4(3):187-192

为了揭示长白山锦北泥炭沼泽区泥炭沉积环境和重金属元素的历史变化及其对环境的指示意义,利用荷兰W ardenaar泥炭采样器采取泥炭样品并对样品进行高分辨率切割。用原子吸收分光光度计和等离子体发射光谱仪测定不同深度剖面Ca,Mg,Na,K,A l,Ti,Cu,Zn,Fe,Mn,Pb,Cr,N i和Co的浓度。研究分析了Ca,Mg,Na,K,A l,Ti,Mn,Zn,Cu,Pb,Cr,N i和Co在泥炭剖面的分布趋势并对其进行了相关分析和富集分析,得出Mn,Zn,Cu,Pb,Cr,N i和Co呈显著相关且在泥炭表层明显累积,揭示出泥炭表层重金属元素的大气沉降来源,表明近年来人类重金属消耗量及排放量的增加是大气沉降重金属元素的主要释放源,而且环境中重金属污染有加重的趋势。  相似文献   

多尺度TIN管理及表达算法探讨     

王殷行  石杏喜  黄明丽 《地理与地理信息科学》2006,22(2):16-20

为实现大规模地形的多分辨率显示与实时绘制,基于LOD技术给出了多尺度TIN的管理和表达算法。探讨该算法相关的数据组织、LOD层次表达、实时刷新等关键问题。该算法使用分级策略,在不影响视觉效果前提下对TIN进行分级表达;使用分区策略,在可视化过程中对TIN进行局部更新。采取不同分辨率TIN模型间逐步过渡策略,基本上消除了视图变换时的跳跃感。实验结果表明,这种紧凑有效的TIN表示方法实现简单,内存开销较少,CPU耗费小,大大缩短了视图刷新切换时间,能够在普通机器上实现大规模地形的实时漫游。  相似文献   

区域生态安全动态变化及空间差异定量分析:以陕北黄土高原为例     

李晶  任志远  周自翔 《地理学报(英文版)》2006,16(2):251-256

1 Introduction Ecological security is defined as the goal of stakeholders to create a condition where the physical surroundings of a community provide for the needs of its inhabitants without diminishing its natural stock (Chen, 2002; Wachernagel et al.,…  相似文献   

Estimating the minimum in-stream flow requirements via wetted perimeter method based on curvature and slope techniques     

LIU Suxia  MO Xingguo  XIA Jun  LIU Changming  LIN Zhonghui  MEN Baohui  JI Lina 《地理学报》2006,16(2):242-250

Under the assumptions of triangular cross section channel and uniform stable flow, an analytical solution of the minimum ecological in-stream flow requirement (MEIFR) is deduced. Based on the analytical solution, the uncertainty of the wetted perimeter method is analyzed by comparing the two techniques for the determination of the critical point on the relationship curve between wetted perimeter, P and discharge, Q. It is clearly shown that the results of MEIFR based on curvature technique (corresponding to the maximum curvature) and slope technique (slope being 1) are significantly different. On the P-Q curve, the slope of the critical point with the maximum curvature is 0.39 and the MEIFR varied prominently with the change of the slope threshold. This indicates that if a certain value of the slope threshold is not available for slope technique, curvature technique may be a better choice. By applying the analytical solution of MEIFR in the losing rivers of the Western Route South-to-North Water Transfer Project in China, the MEIFR value via curvature technique is 2.5%-23.7% of the multi-year average annual discharge, while that for slope technique is 11%-105.7%. General conclusions would rely on the more detailed research for all kinds of cross-sections.  相似文献   

Modification of streaming potential by precipitation of calcite in a sand–water system: laboratory measurements in the pH range from 4 to 12     

Xavier Guichet  Laurence Jouniaux  Nicole Catel 《Geophysical Journal International》2006,166(1):445-460

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Geothermal evidence for fluid flow through the gas hydrate stability field off Central Chile—transient flow related to large subduction zone earthquakes?     

Ingo Grevemeyer  Norbert Kaul  Juan L. Diaz-Naveas 《Geophysical Journal International》2006,166(1):461-468

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