高陡岩质碎裂结构临时边坡抢险治理方法研究          下载免费PDF全文

霍宇翔  黄润秋  巨能攀  赵建军 《探矿工程》2009,36(10):64-67

已变形的碎裂结构临时边坡如不及时治理,极可能出现边坡失稳,而碎裂结构边坡对支护措施适应性差,并且临时边坡抢险治理工程中更要权衡经济因素,所以此类边坡治理难度较大。以大渡河某已变形碎裂结构临时边坡为例,根据碎裂结构临时边坡的特点对边坡治理结构进行了选型,分析了边坡施工顺序对边坡抢险治理工程的影响。采用第一时间进行坡体位移监测,并通过监孔施工反馈信息及时调整治理方案,使用挂网喷混、锚索配合横梁、钢筋桩和排水工程对碎裂结构临时边坡进行了抢险治理。通过数值模拟和监测数据进行了验证,结果表明治理方案经济、适用。  相似文献   

广西丹池盆地F-F界线事件沉积及成因分析     

黄宏伟  杜远生  黄志强  张哲  杨江海  黄虎  吴勘 《地质科技情报》2009,28(5)

广西丹池(南丹-河池)盆地内部在上泥盆统弗拉斯阶与法门阶分界线上普遍发育事件沉积作用,自台地边缘到台内裂陷槽盆地事件沉积分为碎屑流、颗粒流和浊流,沉积岩石分别为砾屑灰岩、含砾砂屑灰岩、递变层砂屑灰岩等.该事件沉积具有等时性、成因相关性和广布性.事件沉积绝大部分位于linguiformis带和triangularis带之间.这些事件沉积可以和广西横县六景、桂林杨堤、德保都安、武宣南峒、象州香田、崇左那艺、上林云攀以及比利时的Hony剖面、美国内华达的Devils Gate剖面、摩洛哥的Atrous剖面、南乌拉尔、俄罗斯西伯利亚东北部的Fore-Kolyma、波兰-摩拉维亚盆地南部(Holy Cross 山脉, Cracow 和Brno 地区)法门阶底部的浊积岩和角砾岩对比.如此广泛的全球性分布的等时性的事件沉积可以和巨大的外行星撞击地球而引起的全球性海啸相联系.  相似文献   

多元素组合异常向R型因子分析因子矿化类型转化的分析应用     

时建民  石绍山  李飞  江山  时哲 《地质与资源》2017,26(1):38-50

利用多元素组合异常指示元素平均值与大兴安岭森林沼泽区水系沉积物地球化学元素丰度值的差,以及与其所在地球化学子区元素变化系数的乘积关系,度量多元素组合异常指示元素在成矿地质作用中的聚集变化强度;计算多元素组合异常元素变化强度的和,对多元素组合异常进行元素变化强度和的评序,遴选主要组合异常.利用多元素组合异常指示元素蕴涵R型因子分析因子结构组合元素矿化类型的意义,判别多元素组合异常因子矿化类型.依据主要组合异常分布、因子矿化类型以及与测区物探、遥感解译线性、环形构造的关系,建立测区主要组合异常聚集带、聚集区.依照主攻矿种元素、相应主要组合异常因子矿化类型信息和相关成矿地质理论,开展测区多元素组合异常优中选优的找矿验证工作.  相似文献   

Rural landscape types and recreational value spatial analysis of valley area of Loess Plateau: A case of Hulu Watershed,Gansu Province,China   总被引：1，自引：0，他引：1  

Suocheng Dong  Hao Cheng  Yu Li  Fujia Li  Zhe Wang  Feng Chen 《中国地理科学(英文版)》2017,27(2):286-297

Rural landscape is a complex of natural landscape and human landscape, with various values. The recreational value of rural landscape is a kind of comprehensive benefit with economic, social and ecological, which is provided by the rural landscape as a recreational resource. Loess Plateau is located at the junction of northern and northwestern of China, with serious water and soil erosion and fragile ecological environment. Jingning County is the national poor county, belonging to Liupanshan concentrated poverty areas. Hulu Watershed in Jingning is the typical valley area of Loess Plateau. In the past few decades, Jingning facing the fragile ecology and poverty, has been focusing on apple industry, forming unique rural landscape, exploring an ecological development path, and making much progress in green industrialization and urbanization. The author, according to the apple tree's growing stages, divided the rural landscape of Hulu Watershed into 15 types and analyzed its spatial patterns. The recreational value of Hulu Watershed was evaluated at 1.8 × 10~8–3.6 × 10~8 yuan(RMB) in 2014, by Travel Cost Method and Contingent Valuation Method. The territorial differentiational features of recreational value were that the higher value landscape types concentrated in the surrounding areas of towns and central villages, and the areas along the traffic and river had more development potentiality. The main influence factors were the construction of rural landscape and the development of recreation industry. And the development paths of different landscape types were also proposed. The research conclusions can provide reference for the landscape exploration and recreation industry development in the similar underdeveloped areas in the valley area of Loess Plateau with fragile ecology and poverty.  相似文献   

Influence of a water regulation event on the age of Yellow River water in the Bohai     

Zhen Li  Haiyan Wang  Xinyu Guo  Zhe Liu  Huiwang Gao  Guiling Zhang 《中国海洋大学学报(英文版)》2017,16(5):727-737

Abrupt changes in freshwater inputs from large rivers usually imply regime shifts in coastal water environments. The influence of a water regulation event on the age of the Yellow River water in the Bohai was modeled using constituent-oriented age and residence time theory to better understand the change in the environmental function of the hydrodynamic field owing to human activities. The water ages in Laizhou Bay, the central basin, and the Bohai strait are sensitive to water regulation. The surface ages in those areas can decrease by about 300 days, particularly in July, and the age stratification is also strengthened. A water regulation event can result in declines in the water age in early July ahead of declines in the water age under climatological conditions (without the regulation event) by about 1 and 5 months in the central basin and Laizhou Bay, respectively. The change in the coastal circulation due to the water regulation event is the primary reason for the change in the Yellow River water age. The high Yellow River flow rate can enhance the density flow and, therefore, reduce the age of the Yellow River water. The subsequent impact of a single water regulation event can last about 1.0 to 4.0 years in different subregions.  相似文献   

Quantification of 3D macropore networks in forest soils in Touzhai valley (Yunnan,China) using X-ray computed tomography and image analysis   总被引：1，自引：0，他引：1  

Jia-ming Zhang  Ze-min Xu  Feng Li  Ru-ji Hou  Zhe Ren 《山地科学学报》2017,14(3):474-491

The three dimensional(3D) geometry of soil macropores largely controls preferential flow, which is a significant infiltrating mechanism for rainfall in forest soils and affects slope stability. However, detailed studies on the 3D geometry of macropore networks in forest soils are rare. The intense rainfall-triggered potentially unstable slopes were threatening the villages at the downstream of Touzhai valley(Yunnan, China). We visualized and quantified the 3D macropore networks in undisturbed soil columns(Histosols) taken from a forest hillslope in Touzhai valley, and compared them with those in agricultural soils(corn and soybean in USA; barley, fodder beet and red fescue in Denmark) and grassland soils in USA. We took two large undisturbed soil columns(250 mm×250 mm×500 mm), and scanned the soil columns at in-situ soil water content conditions using X-ray computed tomography at a voxel resolution of 0.945 × 0.945 × 1.500 mm~3. After reconstruction and visualization, we quantified the characteristics of macropore networks. In the studiedforest soils, the main types of macropores were root channels, inter-aggregate voids, macropores without knowing origin, root-soil interface and stone-soil interface. While macropore networks tend to be more complex, larger, deeper and longer. The forest soils have high macroporosity, total macropore wall area density, node density, and large macropore volume, hydraulic radius, mean macropore length, angle, and low tortuosity. The findings suggest that macropore networks in the forest soils have high interconnectivity, vertical continuity, linearity and less vertically oriented.  相似文献   

两种常用染色剂管道及淤泥条件下示踪及对比——以丁旗地下河连通试验为例   总被引：3，自引：3，他引：0  

易连兴  赵良杰  卢海平  王喆 《中国岩溶》2017,36(5):721-726

通过对丁旗地下河同一投放点同时开展二元示踪试验,探讨了当前被忽略的不同示踪剂应用对比及回收率合理性等问题。在淤泥沉积的地下河管道及流量和浊度稳定条件下,得出主要结论:(1)荧光素钠、罗丹明B回收率分别为53.91%和40.72%,前者比后者少损失13.19%;其中荧光素钠在主峰和缓慢衰减段排出量分别占85.03%和14.97%,罗丹明B则对应为65.88%、34.12%;(2) 荧光素钠对应峰值的回收强度为罗丹明B的2.95倍且最大峰值出现时间比后者提前2 h;(3) 罗丹明B由于吸附等形成的浓度曲线对管道结构分析有可能产生误导,荧光素钠则相对更准确。   相似文献   

热水沉积岩岩石学特征:以内蒙古二连盆地白音查干凹陷下白垩统腾格尔组为例^*     

钟大康  杨喆  孙海涛  张硕 《古地理学报》2018,20(1):19-32

内蒙古二连盆地白音查干凹陷下白垩统腾格尔组—都红木组发育1套热水沉积岩。通过岩心观察、显微镜下鉴定、扫描电镜、全岩X衍射和电子探针分析等手段,对研究区热水沉积岩的矿物组成、结构与构造特征、矿物组合关系进行系统研究,在此基础上进行岩石分类与命名。研究表明: 研究区热水沉积岩在岩心上表现为深灰色、灰色和灰褐色;其矿物组分复杂多样,以白云石和沸石(钠沸石和方沸石)为主要造岩矿物,黄铁矿、菱镁矿、菱铁矿、水镁铁石及重晶石为次要矿物,混有黏土矿物、石英、钾长石和斜长石等泥质陆源碎屑;热水沉积岩结构构造特征复杂多样,根据结构特征可以划分为热水内碎屑结构、泥晶结构和团块结构3种,依据构造特征可以划分为纹层状和条带状构造、网脉状构造、同生变形构造、角砾状构造、蝌蚪状构造、星散状构造、块状构造和韵律性构造8种构造类型;以主要的热水沉积矿物白云石、沸石及陆源的泥质物(黏土矿物、石英及长石)为三端元,以90%、75%、50%、25%、10%为界限,将研究区热水沉积岩划分为泥质白云岩、含沸石白云质泥岩及沸石岩,前两者是研究区的主要岩石类型。本区热水沉积岩岩石学特征的研究可为其他地区的热水沉积岩及其沉积模式研究奠定基础,可以进一步丰富现今的沉积学理论。  相似文献   

江西相山铀矿田含铀碎斑熔岩中电气石化学成分及硼同位素组成特征   总被引：1，自引：0，他引：1  

戴加祺  黎广荣  郭福生  王超  王哲  张万良  于玉帅 《吉林大学学报(地球科学版)》2018,48(5):1378-1393

相山铀矿田是我国最大的火山岩型铀矿田,其赋矿围岩主要为流纹英安岩、碎斑熔岩和部分前寒武纪变质岩和中生代花岗斑岩。碎斑熔岩的边缘亚相中发育直径10~20 cm的球形电气石囊包,其主要的矿物组合为电气石、石英以及少量长石、萤石,伴生少量晶质铀矿,另可见电气石交代早期的长石。利用显微镜、电子探针、激光剥蚀多接收等离子质谱仪等分析仪器,对相山如意亭地区碎斑熔岩中电气石囊包进行了详细的矿物学研究工作。电子探针成分分析显示,碎斑熔岩中电气石为典型的黑电气石,以富含Na、Fe等元素为特征,电气石中挥发性组分较高;其中,B₂O₃质量分数为9.38%~10.04%,F质量分数为0.10%~1.77%。成矿流体中高质量分数的B、F等挥发性组分及岩浆早期阶段的较高氧逸度环境使得U元素更易形成络合物,更利于U的迁移与富集。利用LA-MC-ICP-MS硼同位素微区原位分析法对碎斑熔岩中电气石的硼同位素进行分析测试,结果显示,电气石中的δ¹¹ B质量分数为（-13.15±0.72）‰~（-12.28±0.63）‰,均值为（-12.72±0.94）‰,指示相山火山-侵入杂岩体主要来源于相山底部地壳基底岩石的部分熔融。  相似文献   

A New Martian Meteorite from Antarctica:Grove Mountains (GRV) 020090   总被引：15，自引：0，他引：15  

MIAOBingkui OUYANGZiyuan WANGDaode JUYitai WANGGuiqin LINYangting 《《地质学报》英文版》2004,78(5):1034-1041

Reported in this paper are the petrology and mineral chemistry of GRV 020090, the second Martian meteorite collected from the Grove Mountains, Antarctica. This meteorite, with a mass of 7.54 g, is completely covered by a black and glazy fusion crust. It has two distinct textural regions. The interstitial region is composed of euhedral grains of olivine, pigeonite, and anhedral interstitial maskelynite, with minor chromite, augite, phosphates and troilite. The poikilitic region consists of three clasts of pyroxenes, each of which has a pigeonite core and an augite rim. A few grains of subhedral to rounded olivine and euhedral chromite are enclosed in the pyroxene oikocrysts. GRV 020090 is classified as a new member of lherzolitic shergottites based on the modal composition and mineral chemistry. This work will shed light on the composition of Martian crust and magmatism on the Mars.  相似文献