天池抽水蓄能电站上坝址趾板建基面优化研究     

毕丹  王忠福 《岩土工程技术》2014,28(5):243-249

通过现场调查结合勘测资料分析了天池抽水蓄能电站上坝址蚀变岩体的分布规律;利用薄片鉴定、电镜扫描及X射线粉晶衍射分析试验对蚀变岩体进行了岩石成分和化学成分分析,研究了蚀变作用的地质成因、蚀变机理,结合室内试验获得了蚀变岩的物理力学指标;利用FLAC3D软件对不同工况、不同高程河床蚀变岩趾板建基面进行了数值分析计算.研究结果表明：在左岸和右岸由于强风化下限埋深不大,建议挖除,趾板建基面选择在中等风化的中条期混合花岗岩上;控制坝基变形的主要地质因素是存在于坝基范围内的断层破碎带F25断层以及断层周围由于蚀变造成的砂状岩芯,对大坝沉降影响不利;河床蚀变岩趾板建基面优化数值模拟研究表明,河床部位以在930～950 m之间作为趾板建基面是适宜的.  相似文献   

Assessment of groundwater changing trends through the generalized large well method with confined–unconfined flow model in open-pit mine area     

Tianxin Li  Hongqing Song  Gang Huang  Ying Bi  Xiyao Li 《Environmental Earth Sciences》2014,72(11):4599-4606

In this paper, a simple but accurate method (generalized large well method) is presented to assess groundwater level trends during mine exploitation. This method includes a mathematical model of confined–unconfined well flow and a corresponding analytical solution. Based on the method, a case study was analyzed with data from the Yimin open-pit mine. As a result, the radius of groundwater level rose, along with the increase of the exploitation intensity. Moreover, a suitable value of pumping flow could be beneficial to understanding potential groundwater contamination concerns. Additionally, it has also been predicted that the groundwater level of the Yimin open-pit mine will change within the next 3 years. The Yimin open-pit mine case study demonstrates the validity of the analytical method explained herein. The presented methodology provides a theoretical foundation for assessment of groundwater changing trends in other open-pit mines with similar hydrogeological conditions.  相似文献   

华南陆块陆内成矿作用的一些科学问题   总被引：21，自引：4，他引：17       下载免费PDF全文

胡瑞忠  毛景文  范蔚茗  华仁民  毕献武  钟宏  宋谢炎  陶琰 《地学前缘》2010,17(2):13

华南陆块由扬子地块和华夏地块组成,是全球罕见的世界级多金属成矿省,成矿潜力巨大。华南陆块的形成和演化,受到了很有特色的陆内大陆动力学过程的影响,其中的晚古生代地幔柱成矿系统、中生代大面积低温成矿系统、中生代大花岗岩省成矿系统等陆内成矿系统,在全球背景中很有特色,是全球研究陆内成矿作用的理想基地。对华南陆块地质历史时期的大陆动力学过程如何制约上述成矿作用的发生,以往已开展不同程度的研究并取得重要成果。笔者在论述这些研究进展的基础上,提出了三大成矿系统需要进一步研究的一些科学问题。  相似文献   

The mini-QSO's contribution to cosmic reionization     

Ying-Ying Wang  Lei Wang  Shou-Ping Xiang  Yu Wang  Jing-Meng Hao  Ye-Fei Yuan Center for Astrophysics  University of Science  Technology of China  Hefei  China  Shanghai Astronomical Observatory  Joint Institute for Galaxy  Cosmologyof SHAO  USTC  Shanghai 《中国天文和天体物理学报》2010,10(3)

By employing an improved simulation of the evolution of black holes(BHs)based on the merger tree of dark matter halos,we explore the relationship between the central BH mass Mbh and velocity dispersion σflat high redshift z≥6 and quantify the mini-QSO's(with BH mass M=200-105M)contribution to cosmic reionization.The simulation demonstrates how seed BHs migrate onto the MBH-σ* relation by merging with each other and accreting gas at z≥6:1.The correlation between BHs and their host halos increases as the BHs ...  相似文献   

第十七批天文学名词的推荐译名     

中国天文学会天文学名词审定委员会 《天文学进展》2010,28(1)

中国天文学会名词审定委员会从1985年起开始在<天文学进展>发表天文学名词的推荐译名,到2009年已公布16批共2536个名词.现再推荐第17批114个名词,其中大多数是近年出现的天文学新词.希望读者在使用过程中对译名提出改进意见.  相似文献   

Interstellar Refractive Scintillation and Intraday Polarization Angle Swings     

A.Kraus 《中国天文和天体物理学报》2005,5(1):27-40

Intraday polarization angle swings of ~180° observed in two sources (QSO 0917+624 and QSO 1150+812) are discussed in the framework of refractive interstellar scintillation by a continuous interstellar medium. Model-fits to the I-, Q- and U- light curves were made for both sources. It is shown that for the case of 0917+624 both the intraday intensity variations and the polarization angle swing of ~180° could be explained consistently in  相似文献   

Resonant Heating of Ions by Parallel Propagating Alfvén Waves in Solar Coronal Holes     

Tian-Xi Zhang  Jing-Xiu Wang  Chi-Jie Xiao National Astronomical Observatories  Chinese Academy of Sciences  Beijing  Center for Space Plasma  Aeronomic Research  The University of Alabama in Huntsville  Huntsville  AL  USA   《中国天文和天体物理学报》2005,(3)

Resonant heating of H, O+5, and Mg+9 by parallel propagating ion cyclotron Alfven waves in solar coronal holes at a heliocentric distance is studied using the heating rate derived from the quasilinear theory. It is shown that the particle-AlfVen-wave interaction is a significant microscopic process. The temperatures of the ions are rapidly increased up to the observed order in only microseconds, which implies that simply inserting the quasilinear heating rate into the fluid/MHD energy equation to calculate the radial dependence of ion temperatures may cause errors as the time scales do not match. Different species ions are heated by Alfven waves with a power law spectrum in approximately a mass order. To heat O+5 over Mg+9 as measured by the Ultraviolet Coronagraph Spectrometer (UVCS) in the solar coronal hole at a region ≥1.9.R, the energy density of Alfven waves with a frequency close to the O+5-cyclotron frequency must be at least double of that at the Mg+9-cyclotron frequency. With an appropriate wa  相似文献   

AN IMPROVED LAND-SURFACE PROCESS MODEL AND ITS SIMULATION EXPERIMENT—PART II:COUPLING SIMULATION EXPERIMENT OF LAND-SURFACE PROCESS MODEL WITH REGIONAL CLIMATE MODEL          下载免费PDF全文

丁一汇  张晶  赵宗慈 《Acta Meteorologica Sinica》2000,(1)

The Land-surface Process Model(LPM-ZD)has been successfully coupled with the regionalclimate model RegCM2 of NCAR.Then thus-obtained coupled model(CRegCM)has been appliedto simulate the climate characteristics of heavy rain in middle and East China for three months fromMay to July 1991.and compared with model output of NCAR-RegCM2 using BATS as land-surface process scheme,abbreviated as NRegCM.The results show that CRegCM has good abilityand performance.CRegCM successfully simulates the extreme precipitation event and thesimulations of CRegCM for surface temperature and some physical variables related to land surfaceprocess are more reasonable than those of NRegCM.  相似文献   

光学综合孔径干涉成像的关键技术及多光束干涉仿真     

王海涛  周必方 《紫金山天文台台刊》2003,(1)

闭合相位技术、U -V覆盖技术和像重构技术是光学综合孔径干涉成像的三个关键技术。文中简要介绍了光学综合孔径技术的发展历史、这三种关键技术和光学综合孔径望远镜阵的构成 ,对之进行了多光束干涉的计算机仿真和实验仿真 ,两者结果一致说明了光学综合孔径干涉成像技术中有关干涉的理论的正确性 ,指出了下一步的研究方向。  相似文献   

论企业家的竞争意识     

李碧 《广东海洋大学学报》2004,24(5):46-50

企业家的竞争意识是企业能否取得竞争胜利的基本条件之一。从思维方式、心理品质、竞争观念等三个方面就企业家应具备什么样的意识方可应对市场竞争并取得胜利进行探讨 ,以求让企业家们为更好地应对竞争挑战而自觉地培养良好的竞争意识提供帮助。  相似文献