A study on dynamic shear strength on frozen soil-concrete interface     

Peng Lv  JianKun Liu  YingHui Cui 《寒旱区科学》2013,5(4):0408-0412

Using newly developed dynamic shearing devices, the dynamic shearing strength of frozen soil-concrete interface was studied experimentally. By placing concrete blocks in the lower half of the shear box and frozen soil sample in the upper part, a series of dynamic shear tests on their interfaces were carried out. The obtained results are summarized and the main influencing factors are revealed.  相似文献   

烟台三菱水泥有限公司燕地石灰石矿山资源综合利用情况分析     

吕占林  张国富  王莉 《山东国土资源》2007,23(6):2007/3/19-2007/6/16

烟台三菱水泥有限公司燕地石灰石矿，位于山东省栖霞市臧家庄镇燕地村东。矿山南北长约1000m，东西宽300～500m，属水泥厂石灰石原料专用矿山，矿山固定资产1．32亿元，各类机械设备以进口为主，功能齐全，性能优良。矿山总体为凹陷露天开采，公路运输开拓，开采工艺为：钻孔→爆破→采装→运输→破碎→均化堆积。采用垂直走向拉开段沟，水平分层，由上而下的开采方法，台段高度10m，同时生产的平台2～3个。  相似文献   

Petrology and Geochemistry of the Banded Iron Formation of the Kuluketage Block,Xinjiang, NW China: Implication for BIF Depositional Setting          下载免费PDF全文

Xiangdong Wang  Xinbiao Lv  Xiaofeng Cao  Qian Yuan  Yifan Wang  Wen Liu  Banxiao Ruan 《Resource Geology》2016,66(4):313-334

The Kuluketage block, located in the northeast Tarim craton, is one of the largest Precambrian blocks in the Xinjiang province. Recently, many banded iron formation (BIF)‐type (Superior‐type) deposits have been discovered in the western part of the Kuluketage block. These deposits occurred in the Paleoproterozoic Shayiti Formation, Xingditage Group, which has a nearly E–W distribution in the southern Xinger and Xingdi faults. Tremolite biotite schist and quartzite are the main wall rocks. The geochemical characteristics of schist indicate that the BIFs occurred in a passive continental margin environment. The LA–ICP–MS zircon ²⁰⁶Pb/²³⁸U ages of BIF and late syenite are 1945 ± 10 Ma(MSWD = 0.77) (weighted average age) and 1974 ± 27 Ma(MSWD = 1.05) (upper intercept age), respectively, indicating that the BIFs occurred in the Paleoproterozoic. In addition, the approximately 1.9 Ga magmatic and metamorphic events are consistent with the global‐scale 2.1–1.8 Ga collisional orogen events which are associated with the assembly of the Columbia supercontinent. The geochemical characteristics show that magnetite and quartz are dominant components (total content, 91.65–98.22 wt.%), and the Zr(Nb) and TiO₂, Zr(Nb) and Al₂O₃ and Zr and Y/Ho display strongly positive correlations, illustrating the addition of crustal materials into the chemical precipitate of the original BIFs. The higher Zr, Nb and Al₂O₃ contents and a lower Y/Ho ratio of the Kuluketage BIFs indicate a higher terrigenous detrital component contaminant compared to BIFs of North China Craton (NCC). The rare earth and yttrium (REY) distribution patterns show a slight LREE enrichment and weak Eu positive anomaly features, indicating that the source of Fe and Si of the Kuluketage BIFs is mainly from the contribution of low‐temperature hydrothermal alteration of the oceanic crust. In addition, along with the decreasing BIF depositional age, the declining of Eu anomaly values reflects the increasing importance of low‐temperature hydrothermal solutions relative to high‐temperature hydrothermal solutions. Moreover, no Ce anomalies in studied BIFs, NCC and Xinyu BIFs are attributed to relative reducing environmental condition when the original BIFs precipitated.  相似文献   

Mitigation of multipath effect in GNSS short baseline positioning by the multipath hemispherical map   总被引：4，自引：2，他引：2  

D. Dong  M. Wang  W. Chen  Z. Zeng  L. Song  Q. Zhang  M. Cai  Y. Cheng  J. Lv 《Journal of Geodesy》2016,90(3):255-262

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Climate change and glacier area variations in China during the past half century     

Hong-zhen Tian  Tai-bao Yang  Hui Lv  Cheng-xiu Li  Ying-bin He 《山地科学学报》2016,13(8):1345-1357

Glacier variations in the Tibetan Plateau and surrounding mountain ranges in China affect the livelihood of over one billion people who depend on water from the Yellow, Yangtze, Brahmaputra, Ganges and Indus rivers originating in these areas. Based on the results of the present study and published literature, we found that the glaciers shrank 15.7% in area from 1963 to 2010 with an annual area change of -0.33%. The shrinkage generally decreased from peripheral mountain ranges to the interior of Tibet.The linear trends of annual air temperature and precipitation at 147 stations were 0.36°C(10a)~(-1) and 8.96 mm(10a)~(-1) respectively from 1961 to 2010. The shrinkage of glaciers was well correlated with the rising temperature and the spatial patterns of the shrinkage were influenced by other factors superimposed on the rising temperature such as glacier size, type, elevation, debris cover and precipitation.  相似文献   

Economic benefit assessment of the geo-hazard monitoring and warning engineering system in the Three Gorges Reservoir area: a case study of the landslide in Zigui     

Shiwei Yu  Jindong Hou  Jun Lv  Guizhi Ba 《Natural Hazards》2015,75(2):219-231

The completion and operation of the Three Gorges Reservoir in China have increased the frequency of geo-hazards and dangers in the area. To monitor and to warn of geo-hazards effectively, the Chinese government has invested billions of funds for constructing a monitoring and warning engineering system. Similar to other social infrastructure investments, a reasonable assessment of investment returns is necessary. Therefore, this study proposes an economic benefit assessment model, which considers both the expected and the actual values. The economic benefit of the geo-hazard monitoring and warning engineering in the Three Gorges Reservoir areas is evaluated. Based on the engineering characteristics, the model reasonably defines the frontier of the input and output and adds the casualties and the losses of ecological environment into the economic benefit evaluation index system. A case study on the Zhangjiawan landslide in Guojiaba Town, Zigui County, was conducted. The evaluation results show that (1) land has the largest benefit in direct reductional loss (total of 56.7 %), while the largest indirect reductional losses of the hazard-bearing bodies are in agricultural production and ecological environment (total of 97.6 %); (2) the costs-to-expected return ratio of landslide monitoring and warning engineering is 1:280, whereas the cost-to-actual benefit ratio is 1:30; (3) the accumulation of relevant information and the public knowledge of geological disasters should be strengthened.  相似文献   

硫酸盐型钾盐浮选尾矿的矿质分析及浸取实验研究          下载免费PDF全文

谢绍雷  吕颖  汪小涵  纪律  陈高琪  贾永忠 《盐湖研究》2015,(3):52-57

针对青海大浪滩盐湖地区钾盐浮选尾矿,研究了尾矿中钾盐的赋存形式,并探索了以稀释老卤为溶剂浸取尾矿中钾的优化条件。结果表明,钾主要以钾石盐矿的形式存在于尾矿中,该矿样属于典型的硫酸镁亚型矿质。同时,考察了不同稀释倍数的老卤的物理性质变化,得到了室温条件下该钾盐浮选尾矿最适宜的浸取条件,老卤/淡水的比例为1∶4,固/液比为3∶2,搅拌反应1 h。在优化条件下,得到了钾离子含量为3.93%的富钾卤水,此时K+浸取率达到86.9%,该卤水进一步蒸发结晶可得到软钾镁矾。本研究为低品位硫酸盐型钾矿的综合开发利用提供了数据支持和参考。  相似文献   

Motion characteristics of rolling rocks in Mujialiang collapse caused by the magnitude 8.0 Wenchuan earthquake     

Shiwei Shen  Lei Nie  Shulin Dai  Yan Xu  Min Zhang  Lv Yan 《Arabian Journal of Geosciences》2015,8(12):10267-10276

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Spatiotemporal characteristics and driving factors of global planetary albedo: an analysis using the Geodetector method     

Lv  Mingzhu  Song  Yan  Li  Xijia  Wang  Mengsi  Qu  Ying 《Theoretical and Applied Climatology》2022,147(1-2):737-752

Theoretical and Applied Climatology - As an important parameter of the Earth’s energy budget, the planetary albedo of Earth varies with the dynamics of atmospheric and surface variables. In...  相似文献   

Assessing the Surface-Layer Stability over China Using Long-Term Wind-Tower Network Observations     

Li  Jian  Guo  Jianping  Xu  Hui  Li  Jing  Lv  Yanmin 《Boundary-Layer Meteorology》2021,180(1):155-171

Boundary-Layer Meteorology - Surface-layer stability is important in many processes, such as in the surface energy budget, atmospheric pollution, and boundary-layer parametrizations. Most previous...  相似文献