滑坡滑体与滑床渗透特性关系对滑坡稳定性的影响

众所周知,滑坡滑体的稳定性与地下水静压力和动压力有很大关系.而地下水的渗流方向在地下水影响边坡稳定过程中起决定性作用,当水的渗流方向与滑动方向相同时最不利于滑体的稳定.本文通过对工程实践发现滑坡的滑床与滑体的渗透系数的大小关系对边坡稳定有直接影响的事实,从理论上分析其作用的机理是由于这种大小关系直接影响到地下水的渗流方向,从而导致水对滑体的稳定性有不同的作用.     

水电站坝址区高边坡变形规律分析

水电站边坡是否稳定直接影响工程运行期坝址区安全生产，对整个水电站的发电效益也至关重要。某水电站在施工过程中，形成了包括左岸的厂房边坡和缆机边坡、右岸的坝肩边坡共3个主要高边坡，在对坝址区高边坡所获取的实测安全监测资料进行分析的基础上，指出该水电站边坡不同高程部位变形存在以下规律:即坡脚最大、坡中次之、坡顶最小；对同一区域垂直河流向的月累计位移变化速度和月累计位移量可用来量化边坡发生滑坡的条件。另外，边坡位移量与降雨存在直接关系，但有一定的滞后性。通过对该水电站坝址区高边坡安全监测资料分析，可为坝址区边坡变形预测和预警提供依据。     

三里坪水电站两岸坝肩主要地质缺陷及处理措施

三里坪水电站坝址区地质构造条件复杂,左坝肩多发育缓倾角裂隙,右坝肩有F5断层及一组顺河向小断层,均对坝基的抗滑稳定有一定的不利影响,通过宏观地质分析以及基于裂隙连通率的结构稳定性计算,最终采用左岸大直径混凝土置换洞、右岸EL306~345 m分层设置置换洞的工程处理措施,有效保证了大坝的安全。     

三维建模技术在露天矿土质边坡性质分析中的应用

由于露天矿山土质边坡土体强度低、孔隙度大,地下水易富集和渗流以致更易发生滑坡。针对巴润露天矿山土质边坡稳定性差和地下水患严重的问题,以边坡"水、土"作为研究中心,通过将二维地勘资料进行三维转换,建立矿区第四系三维可视化模型,并进行矿区土体厚度、基岩面起伏形态、基岩面坡度坡向等分析。结果表明,巴润露天矿第四系土层变化复杂,具有厚度深、多向坑内倾斜、坡度大的特征,这些不利因素造成了巴润矿地下水富集和土质滑坡频发。综合现有边坡滑体区域可以发现,除2#和3#滑体外,其余滑体均位于土层厚度大或坡度大区域。结果对于今后矿山边坡维护和后期采矿设计具有重要的指导意义。     

露天矿高陡边坡蠕滑区滑动机理分析

针对安太堡露天矿东帮北部高陡边坡出现的蠕滑问题,简述了边坡的工程背景和滑坡现状,研究了蠕滑区滑坡的主要形成因素及滑动机理;通过滑坡前后边坡面的形态、后缘张拉裂缝以及剪出口的位置对滑移面进行预测;运用FLAC^3D建立了边坡三维地质模型,并进行边坡的变形破坏分析,结合极限平衡分析软件Geo-slope对边坡稳定性进行计算,开展边坡稳定性评价。研究结果表明：边坡变形破坏分为后缘切层滑动、坐落式顺层蠕滑、前缘底鼓滑动3个阶段;雨季降雨以及地下水是造成边坡滑坡的主要外在因素,边坡面顺倾、软弱夹层的存在是导致边坡蠕滑变形的内在因素;自然状态下边坡研究剖面1 180～1 240 m水平段边坡稳定性系数为1.02,蠕滑区边坡稳定性为存在一定风险,需在该区域开展具有针对性的专项治理措施。     

泾河东庄水利枢纽工程高拱坝建设工程地质适宜性研究

高拱坝工程地质适宜性评价是一个复杂的系统工程地质问题。以东庄水利枢纽工程为研究对象,以大量勘察资料为基础,阐述东庄坝址工程地质条件,分析坝址区岩体质量及坝基岩体特性,通过对坝肩稳定、抗滑稳定、变形稳定及边坡稳定等问题的研究,评价东庄坝址建设高拱坝的工程地质适宜性。     

腾龙桥二级水电站导流隧洞工程地质比选

通过腾龙桥二级水电站枢纽区工程地质勘察,区内工程地质条件极为复杂。龙江大断裂紧靠右岸通过,受其影响,岩体风化强烈,较破碎;左岸为顺向坡,大坝下游发育规模较大滑坡体,山坡不稳定。左、右岸导流隧洞选择极为困难,直接关系工程的安全和决策。通过大量的工程地质勘探、分析,比较了两岸导流隧洞的有利因素、缺点及风险和需要采取的工程处理措施,综合考虑工程地质条件推荐了右岸导流隧洞。     

红谷田水库大石头滑坡稳定分析评价

大石头滑坡位于红谷田水库拟选上游近坝右岸,根据滑坡的工程地质条件,采用数值模拟软件GeoStudio对滑坡在不同的工况下进行稳定性计算,并根据计算结果对其稳定性进行分析和评价,提出合理的建议,采用透水性较强的碎块石回填勘探平硐加强地下排水等,以期为工程的后期处理措施提供参考。     

粘土岩中大断面隧洞工程地质及开挖与支护分析

在粘土岩中进行水利水电大断面隧洞工程建设,洞室围岩稳定性、施工开挖及支护措施是工程需解决的主要技术难题.以构皮滩水电站导流隧洞为例,在粘土岩中开挖断面之大位居目前国内软岩隧洞前列,最大跨度、高度分别为18.6m、20.7m,并在工程建设中取得成功,对其工程地质条件、围岩稳定性、施工开挖与支护措施予以简要介绍,可为其它类似工程提供借鉴和参考.     

布沼坝露天矿南帮西段边坡滑移分析与治理

通过实际滑坡范围、水头高度、潜在滑移模式分析,利用数值计算反演确定了布沼坝露天矿南帮西段滑坡模式为沿弱面顺层滑移模式;明确了水头升高、软岩遇水弱化是诱发滑移的最重要因素;设计了(5+10)m高度组合台阶削坡减载方案,清理滑体62万m3.通过方案实施,大幅提升了边坡稳定系数Fs,Fs>1.230,达到了预期效果.为防止软...     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared     

矿用防爆轴流对旋主要通风机叶片ANSYS模态分析及应用

高效节能矿用防爆对旋主要通风机的叶片是主要通风机运行的关键部件,叶片在运行时不断受到气流的作用力,从而使叶片产生振动,当叶片振动的频率与叶片的固有频率接近时,容易产生共振从而导致叶片的断裂。一旦叶片断裂时,对主要通风机的安全运行产生致命的影响,从而导致矿山、化工等企业发生重大事故,将会产生不可估量的损失。基于有限元分析软件ANSYS,对高效节能矿用防爆轴流对旋主要通风机叶片进行模态分析及产生对应的六阶模态频率,对主要通风机叶片的运行频率、固有频率及产生的共振问题进行了原理分析,并且解决了叶片频率共振的问题,从而为主要通风机叶片结构设计提供理论依据,并对主要通风机叶片的安全运行提供保障。     

2013 NdFeB export analysis

<正>China totally exported nearly 24,000 tonsof NdFeB products during 201 3,including 18,825 tons of permanent magnet,valued USD 1.34 billion at an average price of 71.4 USD/kg;3,277 tons of NdFeB magnetic powder,valued USD 1 01 million at an average price of 30.9 USD/kg;1,334 tons of strip casting ribbon,with total export value of USD 74million at an average price of 55.3 USD/kg;and 586     

Market and recycling of NiMH battery

<正>Market status and future trend of NiMH battery1.Global market of small NiMH battery Global market size of small NiMH batteries declined year on year since 2011.The trend will continue to 2018,at the rate of 5%to 10%annually.Demand for small NiMH batteries will be stable gradually.Many electrical apparatuses are powered by the built-in lithium battery today,which is the main reason for the shrunk market of small NiMH batteries.But,for some products,small NiMH     

China rare earth market review

正September 1-10,2014 Affected by the National Day holiday,rare earth transaction was stagnant and the market showed a weak steady state.As there was no good news for downstream market,some products with flat demand would likely rally slightly for some time to     

唐口煤矿深部复杂开采工作面瓦斯分源涌出规律研究

研究工作面瓦斯涌出规律对工作面瓦斯治理有重要意义。为了得到唐口煤矿深部3号煤层复杂开采条件下工作面回采时期瓦斯涌出时空演化规律,选取6304工作面作为对象,采用实测方法研究6304工作面瓦斯涌出规律。结果表明:6304工作面瓦斯涌出量为6.534 m³/min,其中煤壁占34.27%,落煤占29.62%,采空区占36.11%;沿工作面倾向由低到高,瓦斯浓度整体为上升趋势,其中1—76号架工作面瓦斯浓度小于0.20%,76—102号架瓦斯浓度上升明显,最大为0.387%;上隅角的后部采空区是工作面的瓦斯主要涌出源,上隅角1号测点瓦斯浓度0.78%,上隅角周边3号、5号、7号、8号、9号测点瓦斯浓度平均为0.643%;周期来压时,上隅角瓦斯相对平时较高。研究为针对性的瓦斯分源监控与灾害防治提供基础。