滑坡稳定性分析与安全系数取值研究   总被引：5，自引：0，他引：5  

徐青  陈士军  陈胜宏 《中国地质灾害与防治学报》2006,17(3):58-62

在地质灾害中,滑坡灾害分布最广、发生频率最高、危害最大,是我国地质灾害防治的主要对象。滑坡研究的主要任务之一是稳定性分析。论文针对三板溪水电站进水口滑坡和水布垭水电站大岩淌滑坡,分别采用刚体极限平衡法、块体单元法、有限单元法对稳定安全系数和条间推力分布曲线进行分析和比较,研究各种方法的差异和计算精度,以及各种方法稳定安全系数的取值标准,希望为水利水电工程边坡设计规范有关有限单元法、块体单元法条目的编写和相应的允许安全系数取值标准的制定提供一定的参考。研究结果表明:①块体单元法计算的安全系数与刚体极限平衡法计算的安全系数可以采用相同的取值标准,而有限单元法计算的安全系数取值标准可适当降低;②块体单元法计算的条间水平推力、条间剪切力与刚体极限平衡法(尤其是Sarma法)计算的条间水平推力、条间剪切力非常相近,有限单元法计算的条间水平推力、条间剪切力较小;③分析方法、力学模型与参数取值应与安全系数取值标准相匹配。  相似文献   

采矿引起的边坡倾倒滑移变形机理与变形安全性分析研究—以抚顺西露天矿边坡为例   总被引：1，自引：0，他引：1  

申力  纪玉石  刘大勇  祖国林  刘晶辉 《中国地质灾害与防治学报》2006,17(3):63-68

在矿山开发、水电建设过程中倾倒变形问题日渐突出。倾倒变形边坡一般具有反倾边坡结构,变形的过程和机理比较复杂、涉及的变形岩体范围较大、危害严重。论文以抚顺西露天矿边坡为例,通过岩体位移监测资料的跟踪分析、底面摩擦模拟试验,以岩体力学、松散介质力学原理为理论基础,探讨了采矿影响下边坡倾倒滑移体的变形机理,分析认为采矿引起的倾倒滑移变形问题是在特定的地质构造和采矿工程条件下产生的,并提出了岩体变形安全性分析方法。通过工程实例,验证了方法的实用性,并针对实际问题提出了变形整治对策。  相似文献   

洪山预测区煤层赋存的可能性分析     

尚洪田 《中国煤田地质》2006,18(4):25-26,52

分析了洪山预测区西部洪山岩体地质特征及其向外围扩散的范围和程度，研究了北掌勘查区和焦窑煤矿两邻区煤层受岩浆岩影响的程度，认为洪山岩体对预测区煤系及煤层赋存的影响较小，岩体外围仍有煤系赋存。为下一步找煤指明了方向。  相似文献   

淮北煤田孙庄勘探区煤层气赋存规律及影响因素分析     

樊爱英 《中国煤田地质》2006,18(5):25-27

通过对淮北煤田孙庄勘探区地质构造、沉积特征、煤层煤质及煤层气赋存特征的分析，研究认为有利于本区煤层气赋存的主要因素是较大的埋藏深度、较高的壳质组＋镜质组、较高的变质程度、较大的煤层厚度、低透气性的盖层、较缓的地层倾角和封闭性较好的构造条件，推测煤田深部可能具有一定工业价值的煤层气资源。  相似文献   

Comparison of magnetic parameters with vehicular Br levels in urban roadside soils     

Xue-Song Wang  Yong Qin 《Environmental Geology》2006,50(6):787-791

Chemical methods are generally chosen to monitor soil pollution but magnetic measurements proved to yield additional information at low cost and less time consumption. In this investigation, the novel use of rapid and non-destructive magnetic measurements to characterize Br levels in Xuzhou (China) urban roadside soils was reported. X-ray fluorescence spectrometry (XRF) was used to quantify Br in the soil samples. Data from 21 roadside soil samples confirm Br contamination, with a mean level of 4.36 mg kg⁻¹ and a range of 2.4–8.7 mg kg⁻¹. These values are higher than that of unpolluted soils in Xuzhou that averages 1.1 mg kg⁻¹. Hierarchical clustering analysis shows Br in Xuzhou roadside soils is mainly from road traffic. Clear correlations between Br levels and simple magnetic parameters [mass specific susceptibility (χ _LF), susceptibility of anhysteretic remanent magnetization (χ _ARM), saturation isothermal remanence (SIRM)] are observed. The present study shows that these three magnetic parameters can be used as a proxy for Br levels in Xuzhou urban roadside soils.  相似文献   

Mercury speciation and mobilization in contaminated soils of the Valle del Azogue Hg mine (SE,Spain)   总被引：1，自引：0，他引：1  

A. Navarro  H. Biester  J. L. Mendoza  E. Cardellach 《Environmental Geology》2006,49(8):1089-1101

Hg mobilization from contaminated soils and mine wastes was the source of environmental contamination in the Valle del Azogue mining area. We researched solid-phase speciation and aqueous mobility of Hg through Scanning electron microscopy-energy dispersive X-ray spectroscopy and electron probe microanalysis analysis, solid-phase-Hg-thermo-desorption (SPTD) and laboratory column experiments. We found that in contaminated soils and mine wastes, the predominant Hg species was cinnabar (HgS), mainly formed from the weathering of Hg-rich pyrite, and metallic Hg (0) in the matrix, whereas in calcines and tailings the dominant species was metallic Hg (0). The mobilization of Hg in the aqueous phase seems to have originated from the dissolution of elemental Hg (0) present in soils and wastes, reaching concentrations of up to 67 μg l⁻¹, and showing a higher long-term environmental potential risk, in addition to atmospheric emissions.  相似文献   

吸水剖面综合解释方法及应用     

ZHANG Jian-min ZHAO Yong-zhong XU Jing HUANG Juan The Logging Company  Jilin Petroleum Group Co.  Ltd  Songyuan  Jilin  China 《吉林大学学报(地球科学版)》2006,(Z2)

吉林油田同位素吸水剖面测井采用~(113)In同位素追踪技术,根据同位素追踪过程解释基本可以判断配水层段吸水情况。但是在注水井存在沾污、大孔道以及串槽等影响时,吸水面积确定比较困难。在同位素测井中增加井温、流量参数,通过多参数综合解释,不仅可以对沾污影响进行合理校正,确定准确的小层吸水量,而且能够正确判断各级封隔器、配水器的工作情况,在地层存在大孔道的情况下,确定地层的吸水面积。吸水剖面综合解释方法在吉林油田已普遍应用,见到明显的效果。  相似文献   

基于GIS的供电台区经营综合评价     

王玲  边馥苓 《测绘信息与工程》2005,30(6):32-33

探讨了运用GIS技术对供电台区经营综合评价的实现方法,选取了业务属性和空间属性两个方面评价因子,介绍了从系统软硬件、评价实现过程及显示结果等方面评价过程的具体技术实现。  相似文献   

Land-Parcel Land-Use History as a Key to Site Selection for Documenting Soil Contamination Risk： a Case Study from Australian Suburbia     

YU Jie Ursula Pietrzak Jim Peterson 《地球空间信息科学学报》2005,8(4):257-261

In that orcharding in early-to-mid twentieth century southeastern Australia involved use of certain heavy metal and As compounds in regular pest-control spray procedures, some interest attaches to the possibility that these landparcels are underlain by soils with above-background Cu, Pb and As levels. Interpreta- tion of Land-cover changes allowed land parcels previously occupied by orchards to be identified in the 1950s through time-series air-photos. A comparison of soil analysis results referring to soil samples from control sites, and from land parcels formerly occupied by orchardists, shows that contamination （above-background） levels of cations in the pesticides can be found in the top 6 cm of former orchard soils. It is clear that digital spatial data handling and culturally-informed air photo interpretation has a place in soil contamination studies, land-use planning （with particular reference to re-development） and in administration of public health.  相似文献   

陕西金矿床类型及其找矿方向     

齐文  侯满堂 《陕西地质》2005,23(1):1-10

通过对陕西金矿资源的分析、总结,将陕西金矿成因类型划分为7类14亚类;与金矿有关的成矿系列划分为3个矿床成矿系列组合,7个成矿系列类型,10个成矿系列和4个亚系列;金矿床空间分布严格受隐伏基底和出露基底,隐伏岩体、重磁吻合构造,构造和成矿时代的控制;与金成矿有关的Ⅲ级成矿区(带)有4条,有关的Ⅳ级成矿区(带)有10条,有关的Ⅴ级主要金成矿区(带)有16条;提出了金矿新的找矿方向,为今后本区金矿地质找矿的新突破提供信息.  相似文献